SECTION 5B - ABS & ABS/TCS

IMPORTANT

Before performing any Service Operation or other procedure described in this Section, refer to Section 00

CAUTIONS AND NOTES for correct workshop practices with regard to safety and/or property damage.

CONTENTS

1. GENERAL INFORMATION

1.1 ANTILOCK BRAKING SYSTEM (ABS)

WHEEL SLIP

STEERING CONTROL

CORNERING FORCE

FACTORS AFFECTING BRAKING

1.2 TRACTION CONTROL SYSTEM (TCS)

BASE SYSTEM

1.3 SERVICE INFORMATION

2. GENERAL DESCRIPTION

2.1 ABS AND ABS/TCS SYSTEM

OVERVIEW

BASIC OPERATING PRINCIPLE

ABS CONTROL

2.2 NORMAL CONDITIONS DURING

ANTILOCK BRAKING AND TRACTION

CONTROL INTERVENTION

2.3 ABS AND ABS/TCS SYSTEM COMPONENTS

WHEEL SPEED SENSORS AND PULSE RINGS

ABS AND ABS/TCS CONTROL MODULE

HYDRAULIC MODULATOR

THROTTLE RELAXER

THROTTLE RELAXER CONTROL MODULE

ABS WARNING LAMP

ELECTRONIC TRACTION CONTROL (TCS)

WARNING DISPLAYS

ELECTRONIC TRACTION CONTROL (T/C)

SWITCH

BRAKE MASTER CYLINDER

ABS & TCS FUSES

STOP LAMP SWITCH

2.4 INSTALLATION POSITION OF ABS AND

ABS/TCS COMPONENTS

2.5 ABS PRINCIPLES OF OPERATION –

EXCLUDING ABS/TCS

NON-ANTILOCK BRAKING

ANTILOCK BRAKING

ABS CONTROL MODULE OPERATION

HYDRAULIC MODULATOR OPERATION

MASTER CYLINDER OPERATION

OPERATION AND TESTING OF THE

ABS WARNING LAMP

2.6. ABS/TCS PRINCIPLES OF

OPERATION - EXCLUDING ABS

NON-ANTILOCK BRAKING / NON

ELECTRONIC TRACTION CONTROL

ANTILOCK BRAKING

ELECTRONIC TRACTION CONTROL

ABS/TCS CONTROL MODULE OPERATION

HYDRAULIC MODULATOR OPERATION

MASTER CYLINDER OPERATION

OPERATION AND TESTING OF THE

ABS AND TRAC OFF WARNING LAMPS

3. SERVICE OPERATIONS

3.1 SAFETY AND PRECAUTIONARY MEASURES

3.2 BRAKE SYSTEM – BLEED

3.3 FRONT WHEEL SPEED SENSOR LEAD

REMOVE

TEST

REINSTALL

3.4 WHEEL SPEED SENSORS

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

3.5 PULSE RINGS

REMOVE

REINSTALL

3.6 HYDRAULIC MODULATOR AND

CONTROL MODULE ASSEMBLY

REMOVE

REINSTALL

3.7 CONTROL MODULE

REMOVE

INSPECT

REINSTALL

3.8 MASTER CYLINDER

REMOVE AND REINSTALL

OVERHAUL

3.9 TRACTION CONTROL SWITCH

REMOVE

TEST

REINSTALL

3.10 THROTTLE RELAXER CONTROL

MODULE (GEN III V8 ONLY)

REMOVE

REINSTALL

3.11 THROTTLE RELAXER (GEN III V8 ONLY)

4. ABS AND ABS/TCS DIAGNOSIS

4.1 GENERAL DESCRIPTION

4.2 BASIC KNOWLEDGE REQUIRED

4.3 VISUAL INSPECTION

ABS, ABS/TCS VISUAL INSPECTION CHART

4.4 ABS & ABS/TCS FUNCTIONAL CHECK

ABS & ABS/TCS FUNCTIONAL CHECK CHART

4.5 INTERMITTENT FAILURES

4.6 ABS & ABS/TCS SELF DIAGNOSTICS

DIAGNOSTIC TROUBLE CODES

FLASH CODE DIAGNOSTICS DISPLAY

ABS DIAGNOSTIC TROUBLE CODES

ABS/TCS DIAGNOSTIC TROUBLE

CLEARING DTCs

4.7 TECH 2 DIAGNOSTICS

4.8 TECH 2 TEST MODES AND SCREEN

DISPLAYS FOR ABS & TCS DIAGNOSIS

SYSTEM SELECT MENU

VEHICLE IDENTIFICATION MENU

SYSTEM IDENTIFICATION

ABS/TCS APPLICATION MENU

F4: MISCELLANEOUS TESTS

4.9 DIAGNOSTIC CHARTS – V6 ENGINES

INTRODUCTION

CHART A1 – ABS WARNING DISPLAY

INOPERATIVE

CHART A2 – TRAC OFF WARNING DISPLAY

INOPERATIVE

CHART A3 – LOW TRAC WARNING DISPLAY

INOPERATIVE

CHART B – POWER SUPPLY TO CONTROL

MODULE (NO DTCS STORED)

Techline

CHART C1 – ABS OFF WARNING DISPLAY

ACTIVATED CONTINUOUSLY (NO DTCs

STORED)

CHART C2 – TRAC OFF WARNING DISPLAY

ACTIVATED CONTINUOUSLY (NO DTCs

STORED)

CHART C3 – LOW TRAC WARNING DISPLAY

ACTIVATED CONTINUOUSLY (NO DTCs

STORED)

DTC 21 – FRONT RIGHT WHEEL SPEED

SENSOR INCORRECT SIGNAL

DTC 23 – FRONT RIGHT WHEEL SPEED

SENSOR SHORT OR OPEN CIRCUIT

DTC 25 – FRONT LEFT WHEEL SPEED

SENSOR INCORRECT SIGNAL

DTC 27 – FRONT LEFT WHEEL SPEED

SENSOR SHORT OR OPEN CIRCUIT

DTC 28 – WHEEL SPEED SENSOR

FREQUENCY ERROR

DTC 31 – REAR RIGHT WHEEL SPEED

SENSOR INCORRECT SIGNAL

DTC 33 – REAR RIGHT WHEEL SPEED

SENSOR SHORT OR OPEN CIRCUIT

DTC 35 – REAR LEFT WHEEL SPEED

SENSOR INCORRECT SIGNAL

DTC 37 – REAR LEFT WHEEL SPEED

SENSOR SHORT OR OPEN CIRCUIT

DTCs 41, 42, 45, 46, 47, 48, 51, 52, 55 &

56 – SOLENOID VALVE CIRCUIT FAULTS

DTC 61 – PUMP MOTOR OR RELAY FAULT

DTC 62 – RPM SIGNAL FAULT

DTC 63 – VALVE SOLENOID RELAY CIRCUIT

FAULT

DTC 67 – STOP LAMP SWITCH CIRCUIT FAULT

DTC 71 – CONTROL MODULE INTERNAL FAULT

DTC 72 – SERIAL DATA FAULT

DTC 73 – REQUESTED TORQUE CIRCUIT FAULT

DTC 74 – ACTUAL TORQUE CIRCUIT FAULT

DTC 78 – INCORRECT OPTION CODING

DTC 85 – SYSTEM VOLTAGE TOO LOW

5. ABS/TCS DIAGNOSIS – GEN III V8 ENGINE ONLY

5.1 GENERAL DESCRIPTION

5.2 BASIC KNOWLEDGE REQUIRED

5.3 VISUAL INSPECTION

ABS/TCS VISUAL INSPECTION CHART

5.4 ABS/TCS FUNCTIONAL CHECK

ABS OR ABS/TCS FUNCTIONAL CHECK CHART

5.5 INTERMITTENT FAILURES

5.6 ABS/TCS SELF DIAGNOSTICS

5.7 TECH 2 DIAGNOSTICS

5.8 TECH 2 TEST MODES AND SCREEN

DISPLAYS FOR ABS/TCS DIAGNOSIS

5.9 DIAGNOSTIC CHARTS

INTRODUCTION

DTC 58 – THROTTLE RELAXER PWM

INTERFACE FAULT

DTC 62 – RPM SIGNAL FAULT

DTC 64 – THROTTLE RELAXER CONTROL

MODULE POSITION FAULT

DTC 65 – THROTTLE RELAXER MOTOR FAULT

DTC 66 – THROTTLE RELAXER CONTROL FAULT

DTC 68 – THROTTLE POSITION SENSOR

MONITORING FAULT

DTC 72 – SERIAL DATA FAULT

DTC 73 – SPARK RETARD MONITORING FAULT

6. SPECIFICATIONS

7. TORQUE WRENCH SPECIFICATIONS

8. SPECIAL TOOLS

1. GENERAL INFORMATION

Essentially, ther e can be two systems fitted to a M Y 2003 VY and V2 Series vehicle; the Antilock Braking System

only, (ABS) and an Antilock Braking System (ABS) combined with an Electronic Traction Control system (TCS).

The combined two systems are known as ABS/TCS

W hile the ABS a lone, h as c omm on elem ents, r egardle ss of the engin e fitted , the AB S/TC S has m ark ed diff erences

between the V6 and GEN III V8 engine applications. While the general information and servicing segments are

combined, the diagnostic sections have been separated between the V6 and GEN III V8 engines, where the

diagnostic procedure is different.

1.1 ANTILOCK BRAKING SYSTEM (ABS)

The pur pose of the Ant ilock Brak ing System (ABS) is to pre vent wheel lock-up during heavy brak ing conditi ons on

most road surfaces. A vehicle that is stopped without locking the wheels will normally stop in a shorter distance

than a vehicle with lock ed wheel/s, while m aintaining directional stabilit y and some steering capabilit y. This allows

the driver to retain greater control of the vehicle during heavy braking.

Therefore, the object of an Antilock Braking System (ABS) is to provide drivers with:

1. Enhanced braking performance by reducing vehicle speed in the shortest distance possible on most road

surfaces.

2. Enhanced steering control by enabling the vehicle to move in a driver-controlled direction during braking

manoeuvres.

WHEEL SL IP

Maxim um br ak ing is ac hiev ed when whee l loc k-up is preven ted. M aximum br ak ing forc e is gen er ate d when the t yre

slip is approx imatel y 12%.

T yre slip ca n be anywhere between 0% and 1 00%. W ith reference to Fig. 5 B-1, with zero % s lip, the wheel r otates

freely as in case ‘A’. However, should the wheel lock, as in case ‘B’ but is still pushed along the road surface, by

the energy and inertia (‘C’) of the moving vehicle.

Figure 5B-1

At zero slip (0%) , a tyre rolls fr eely. At 100% slip, a

tyre locks up as the weight of the vehicle pushes

the non-rotating tyre along. At 100% slip, the

brakes stop the tyre but not the vehicle.

Legend:

A Decreasing Stopping Distance

B % of Tyre Slip

1 No Braking

2 Best Braking (approximately 12% Slip)

3 Least Effective Braking

4 Lack of vehicle Control (Slide) from This Point

Figure 5B-2

The braking system needs tyre traction to function: In operation, the brakes convert the vehicle's forward motion

into heat e nergy. The br akes cannot generate stop ping for ce unless the t yres have tractio n. Tyre tracti on provides

a counter force for the brakes to work against.

The forces involved in stopping a vehicle are extremely high. For example, stopping an 1800 kg vehicle from 100

km/h requires the brakes to generate approximately 8,100 kilojoule (kJ) of braking energy.

At 100% slip, the vehicle's forward energy is turned into braking energy between the tyre and the road surface.

However, the d isadvantag e here is that the tyres again st the road surf ace are a very poor high tem perature f riction

material when compared to that of the brake pads. Brake pad material can generate stopping force much more

efficiently than the road surface and a non-rotating tyre. The lack of traction at 100% slip explains why locked

wheels produce long vehicle stopping distances.

Professional dr ivers caref ully control lock up by limiting brake pressure, but even they cannot always prevent lock-

up on wet roa ds or in other reduced tr action con ditio ns. In theor y, drivers m ust lim it brake applic ations just shor t of

lock-up. In practice, drivers rapidly pump the brakes to reduce lock-up. They apply, release, reapply and release

the brakes until the vehicle stops.

However, the m o st skilled d r ivers c ann ot p ump the br a kes rapidl y or prec is ely enough f o r the b es t br aking under al l

conditions. Of course, pumping of the brake pedal applies and releases the brakes at all four wheels at the same

time. Ideally, automatic individual control over the braking at each wheel would enhance braking on most road

surfaces. This is precisely what ABS attempts to achieve.

STEERING CONTROL

Steering control, like braking, also depends upon

tyre traction. A locked wheel/tyre in a 100% slip

condition (refer 5B-3) delivers poor braking and

directional control. Therefore, some tyre rotation is

also necessary for steering control.

In this example, the front tyre direction (A) has

minimal steering effect, with the vehicle sliding in

direction ‘B’. The tyres must regain their traction

before steering control is restored to the vehicle.

Figure 5B-3 – Minimal Steering Effect at 100% Slip

CORNERING FORCE

From view ‘A’, Centrifugal force (1) inevitability acts on a vehicle that is turning a corner. A balancing force (2)

(referred to as ‘cornering force’) is needed to overcome the centrifugal force so that the vehicle will stay on the

road. The cornering force (2) is produced when tyre distortion occurs during turns (while the wheels are rotating).

This distortion of the t yre tread chang es the direction t he tyre is pointing (4), relative to the direction the vehicle is

travellin g (3). T he an gle b etween the t wo (‘θ’) is ref erred to as a “s lip a ngle” a lthou gh no ac tual ‘sl ip’ occ urs, u nless

the t yre to road footprint is lost. If wheel/t yre lock -up does occur, the c ornering f orce will becom e zero). The graph

in view ‘B’ sh ows the rela tions hip betwee n th e percen tage of slip ( Z) and the cor nerin g for ce (X ), relati ve to the sl ip

angle (Y).

Figure 5B-4

FACTORS AFFECTING BRAKING

During vehicle braking, several conditions and forces are at work. These include those factors shown in the

follo wing il lus tr at io n:

1. Road surface (dirt, gravel, bitumen).

2. Sudden changes in the road surface (oil, puddles, ice spots).

3. Tyres.

4. Road conditions (smooth, rough, wet, dry).

5. Wheel loading when stopping.

6. Vehicle weight.

7. Steering manoeuvres.

The adv ent of solid s tate elec tronics enab les t hese fac tor s to be m onitored and al lo wed for during brak ing. W ithout

special electronics devices, the braking system could not account for these variables.

Figure 5B-5

1.2 TRACTION CONTROL SYSTEM (TCS)

Critical driving situations are not restricted to braking; they can also occur during standing start and moving

acceleration (especially on slippery gradients) and during cornering. These conditions can present drivers with

more than they can handle. The result: dangerous driving errors.

Electro nic Trac tion Contr ol (T CS) is des igned to solve these prob lems . The prim ary purpos e of T CS, an exp anded

version of ABS, is to reduce the demands placed on the vehicle by the driver by maintaining vehicle stability and

steering response under acceleration (provided that the physical limits are not exceeded). When fitted to V6

engined vehicles, TCS does this through the use of ABS (brake intervention) and adapting the engine torque (spark

timing retard) to levels corresponding to the traction available at the road surface, before the situation becomes

critical. When the GEN III V 8 eng ine is f itted to t he veh i cle, while both br ake and e ngine i ntervention are s till used a

throttle relaxer is also fitted, to control the throttle valve position in the throttle body. The throttle relaxer is controlled

by its own Throttle Relaxer Control Module, that in turn, receives information from the ABS/TCS Control Module.

The throttle relax er is pos it i oned part way along t he acce lerator cable in the engine c ompar tm ent. T he r eque s t f r om

the accelera tor pedal (ped al depress ed), is trans mitted via the c able to the thr ottle relax er. Under norm al operating

conditio ns , th e r eq ues t t he c ontin ues o n to th e t hrottle valve. H o we ver, in a s i tuat i on wher e a rear wheel is a bout to

lose tr action s a y, under to o intense an ac celer ation r equest f or th e ro ad condi tion s, the throttle rel axer will int err upt

the accelerator pedal request and control the throttle valve position in the throttle body, directly. In this way a

potential loss of traction condition is averted.

By combining TCS and ABS, it is possible to obtain higher levels of safety through dual purpose application of

system components.

BASE SYSTEM

The TCS system must be capable of inhibiting wheelspin during initial or moving acceleration under the following

conditions:

• When the lane surface is slippery on one or both sides.

• As the vehicle emerges from an ice covered road surface.

• During acceleration when cornering.

• When starting off on a gradient.

The TCS system must also intervene in the following situations:

• When a wheel spins (the same as when it locks), the lateral forces which it can transmit are limited; the

vehicle becomes unstable and the rear ‘fishtails’. TCS maintains vehicle stability for enhanced safety.

• Spin also leads to increased tyre tread wear and drivetrain stress, ie. rear axle. TCS avoids the drivetrain

loads that occur when a spinning wheel suddenly finds traction on a high adhesive surface.

• TCS must be ready to intervene automatically at all times. TCS employs the difference in slip rates at the

drive wheels to d is tin gu is h bet ween c or ner ing a nd ac celeration s lip pa ge. The t yres do not dr ag in tight r ad ius

corners, as can occur with a differential lock. Limited slip differentials can not always inhibit wheel spin

resulting from excess throttle applications. In contrast, TCS also regulates the engine output to ensure that

the wheels retain traction.

• T he system r esponds to condit ions in th e physical t hreshold r ange b y triggering a LOW TR AC warning lam p

in the instrument cluster to alert the driver.

1.3 SERVICE INFORMATION

Apart from the information contained within this Section, additional servicing details on the ABS and ABS/TCS,

reference can also be made to:

a. Section 3 FRONT SUSPENSION in the MY 2003 VY and V2 Series Service Information, for information

relating to front wheel bearing hub removal and/or reinstallation operations.

b. Section 4B FINAL DRIVE AND DRIVE SHAFTS in the MY 2003 VY and V2 Series Service Information, for

details of rear axle sensor removal and adjustment details.

c. General brake bleeding operations for the ABS and ABS/TCS are the same as for the standard braking system.

This operation is described in Section 5A SERVICE AND PARK BR AKING SY STEM S in the MY 2003 VY and

V2 Series Service Information.

IMPORTANT: When bleeding operations are carried out, that involve the ABS Hydraulic Control Module,

then specific procedures must be followed that require the use of Tech 2. Refer to Section 0C TECH 2, in

the MY2003 VY Series Service Information for details.

2. GENERAL DESCRIPTION

There can be two types of ABS fitted to MY 2003 VY and V2 Series vehicles; one without traction control, ABS

(production option JL9) and one with traction control ABS/TCS (production options JL9 and NW9). Depending on

individual vehicle specifications, either one of these options may be utilised or, neither of them. W here differences

in service procedures or routing (e.g. brake piping), between left and right hand drive vehicles are evident, then

illustrations will be used to reflect those changes.

NOTE: As the two systems are not compatible it is not possible to build a V6 engined vehicle with

Electronic Traction Control (TCS) and Liquefied Petroleum Gas (LPG.). If a vehicle with TCS is to be fitted

with an aftermarket LPG system, the TCS system must be permanently disabled.

The only recommended way of disabling the TCS system on a V6 engined vehicle, is to disconnect terminal

27 from the ABS/TCS control module connector A37 X1, circuit 27, Black/White wire (actual torque – MMI).

This is to be achieved by withdrawing terminal 27 from connector A37 X1 and taping the wire back to the

main wiring harness. This will disable the TCS system while maintaining normal ABS operation.

If the TCS system is disabled, the TC OFF warning display in the instrument cluster will be permanently

activated when the ignition is on and Diagnostic Trouble Code 74 will be logged. At no time must the ‘T/C

OFF’ warning lamp be disconnected as it’s function is to advise the driver that this safety feature is not

available.

On all MY 2003 VY and V2 Series vehicles, the conventional portion (non-ABS) of the braking system comprises

the conve ntional heav y dut y brak ing system , specific br ake pipe harnes s and lines and a comm on m aster cylinder

with the conve ntional no n- AB S braking system . W ith ABS or ABS/TCS ho we ver, the master c ylinder has a scr ew-i n

blanking plug installed into the lower of the two front brake outlets. Each front wheel hub also includes the wheel

speed sensor as p art of the assembly. The rear wheel speed sensors are toot hed pulse rings attached to each of

the inner axle flanges.

At road sp eeds a bove approximatel y 6 km /h, the A BS i s designed to co ntr ol brake f luid pres s ure s o th at th e whee ls

are pre vented from loc king-up d ur in g braking, ir res pec t ive of the r oa d c on dit ions a nd tyre gr ip. The s ystem s tarts to

regulate when one wheel is detected to be decelerating faster than the other wheels, tending to lock. The vehicle

remains steerable, even in the event of panic braking, for instance on bends or when swerving to avoid an

obstacle.

The ABS without traction control fitted to MY 2003 VY and V2 Series vehicles, modulates braking pressure

separate ly at each fr ont wheel, wit h the rear whee ls sharing a s ingle AB S modulated hydraulic c ircuit. T his ABS is

referred to as a three-channel s ystem , as three separate hydraulic brake circuits are used to the achieve anti-lock

braking function.

The ABS/TCS (ABS with electronic traction control) fitted to MY 2003 VY and V2 Series vehicles, modulates

brak ing press ure se paratel y at e ach f ront and rear wh eel. T he AB S/TCS is ref erred t o as a four c hann el s ystem as

each of the four wheels have a separate hydraulic brake circuits which are used to achieve anti-lock braking and

traction control functions. The term modulated refers to the ABS ability to 'Maintain', 'Reduce' or 'Increase' (Build-

up) the hydraulic pressure in the various brake circuits based on various inputs.

The Tech 2 diagnostic scan tool is programmed to assist with MY 2003 VY and V2 Series vehicle electrical

diagnosis and problem solving, including ABS and ABS/TCS Tech 2 connects to the ABS or ABS/TCS serial data

communication inform ation via the Dat a Link Connector (DLC), attached to the instrument panel lower trim, to the

right of the steering column. For additional information on DLC location and system diagnosis, refer to

4. AB S DI AG NO S IS in this Sectio n. For additio nal and m ore com prehensive inf ormation regar ding T ech 2, refer to

Section 0C TECH 2 in the M Y 2003 VY and V2 Ser ies Ser vice Inform ation.

Figure 5B-6 – Typical Location for ABS/TCS Components Fitted to a RHD Vehicle with either V6 Engine

Legend

1. Hydraulic Modulator and Control Module Assembly

2. Brake Master Cylinder

3. Stop Lamp Switch

4. Body Control Module (BCM)

5. TRAC OFF W arning Lamp

6. TRAC LOW W arning Lamp

7. ABS OFF Warning Lamp

8. Traction Control Switch (in Console)

9. Right Hand Rear Wheel Speed Sensor

10. Left Hand Rear Wheel Speed Sensor

11. Powertrain Control Module (PCM) – For ABS/TCS Only

12. Left Hand Front Wheel Speed Sensor

13. Right Hand Front Wheel Speed Sensor

Figure 5B-7 Typical Location for ABS/TCS Components Fitted to a LHD Vehicle with the V6 Engine

Legend

1. Hydraulic Modulator and Control Module Assembly

2. Body Control Module (BCM)

3. TRAC OFF W arning Lamp

4. TRAC LOW Warning Lamp

5. ABS OFF Warning Lamp

6. Traction Control On/Off Switch (in Console)

7. Right Hand Rear Wheel Speed Sensor

8. Left Hand Rear Wheel Speed Sensor

9. Stop Lamp Switch

10. Brake Master Cylinder

11. Powertrain Control Module (PCM) – For ABS/TCS Only

12. Left Hand Front Wheel Speed Sensor

13. Right Hand Front Wheel Speed Sensor

Figure 5B-8– Typical Location for ABS/TCS Components fitted to a RHD Vehicle with the GEN III V8 Engine

Legend

1. Hydraulic Modulator and Control Module Assembly

2. Brake Master Cylinder

3. Stop Lamp Switch

4. Body Control Module (BCM)

5. TRAC OFF W arning Display

6. TRAC LOW W arning Display

7. ABS OFF Warning Display

8. Traction Control On/Off Switch (in Console)

9. Right Hand Rear Wheel Speed Sensor

10. Left Hand Rear Wheel Speed Sensor

11. Powertrain Interface Module (PIM)

12. Throttle Relaxer (Actuator) Control Module

13. Throttle Relaxer (Actuator) Assembly

14. Left Hand Front Wheel Speed Sensor

15. Powertrain Control Module (PCM) – For ABS/TCS Only

16. Throttle Position Sensor (TP Sensor)

17. Right Hand Front Wheel Speed Sensor

Figure 5B-9 – Typical Location for ABS/TCS Components fitted to a LHD Vehicle with the GEN III V8 Engine

Legend

1. Hydraulic Modulator and Control Module Assembly

2. Throttle Relaxer (Actuator) Assembly

3. Body Control Module (BCM)

4. TRAC OFF W arning Display

5. TRAC LOW W arning Display

6. ABS OFF Warning Display

7. Traction Control On/Off Switch (in Console)

8. Right Hand Rear Wheel Speed Sensor

9. Left Hand Rear Wheel Speed Sensor

10. Stop Lamp Switch

11. Brake Master Cylinder

12. Powertrain Interface Module (PIM)

13. Throttle Relaxer (Actuator) Module

14. Left Hand Front Wheel Speed Sensor

15. Powertrain Control Module (PCM) – For ABS/TCS Only

16. Throttle Position Sensor (TP Sensor)

17. Right Hand Front Wheel Speed Sensor

2 1 ABS AND ABS/TCS SYSTEM OVERVIEW

BASIC OPERATING PRINCIPLE

The rotational speed of each wheel is m easured by inductive wheel speed sens ors. W hen the brakes are applied,

the change in rotational speed is used by the processor in the ABS or ABS/TCS control module to determine the

deceleration, acceleration and slip of the wheels.

On vehic les with ABS ( excluding AB S/TCS), the fr ont wheels are i ndividuall y c ontroll ed with the rear wheels bei ng

controlled jointly (three channel system). If one side of the road surface is slippery, the rear wheel braking on this

surf ace determ ines the brak ing press ure of both rear whee ls. On ve hicl es with A BS/T CS, the f ront and r ear whee ls

are individually controlled (four channel system).

Figure 5B-10

Legend

A Calculate

B Control

C Test Monitor Warn

D Wheel Speed

E Brake Pressure

F Influence on Brake Pressure

G Road Surface Condition

1. Wheel Speed Sensor

2. Brake caliper

3. Hydraulic Modulator

4. Brake Master Cylinder

5. Electronic Control Module

6. Instrument Warning Display

Three Chann el ABS (R efer Figur e 5B-1 1)

The braking force for each of the front wheels is regulated using individual inlet and outlet solenoid valves within

the hydraulic modulator, and the rear wheels are controlled by a common set of inlet and outlet solenoid valves

within the hydraulic modulator. Four sensors measure the individual speed of each wheel.

Figure 5B-11

Legend

1. Wheel speed sensors

2. Brake calipers

3. Hydraulic modulator

3a. Solenoid valve

3b. Return pump

4. Brake master cylinder

5. Electronic control module

Four Channel ABS/TCS (Refer Figure 5B-12)

The braking force for each wheel (front and back) is regulated using individual inlet and outlet solenoid valves

within the hydraulic modulator. Four sensors measure the individual speed of each wheel.

Figure 5B-12 Four Channel ABS/TCS

Legend

1. Wheel speed sensors

2. Brake calipers

3. Hydraulic modulator

3a. Solenoid valve

3b. Return pump

4. Brake master cylinder

5. Electronic control module

6. Switching valve

7. Priming valve

ABS CONTROL

Lock-up (Refer Q in Figu re 5B-13)

During full braking, the driver usually applies braking pressure (FP) to such an extent that the wheel speed (WS)

rapidly decreases causing wheel lock-up (L). This results in a loss of steering control, and the maximum possible

braking effect is not attained. During ABS-controlled full braking, the braking pressure is automatically adjusted to

prevent wheel lock-up, regardless of brake pedal force.

The processes involved are:

• m aintain ing pr es su re

• reducing pressure

• increasing (building-up) pressure.

Maintain ing Pr es s ure (Ref e r R in Figure 5B-13)

If a wheel speed sensor signals severe wheel deceleration to the ABS control module, ie. the wheels are likely to

lock-up, the braking pressure at the wheel involved is initially maintained (kept constant) as opposed to being

further increased (point M).

Reducing Pres s ure (Ref er S in Figure 5B-13)

If the wheel still continues to decelerate rapidly, the pressure in the brake caliper circuit is reduced so that the

wheel is braked less heavily (point R).

Increasing (Building-up) Pressure (Refer T in Figure 5B-13)

The wheel accelerates again (WS) as a result of the reduced braking pressure. Upon reaching a spec ific limit, the

ABS or A BS/TCS c ontro l modu le reg isters the fac t that the wheel is no w not bei ng br ak ed suff iciently. The f orm erl y

reduced pressure is then incr eased, prov ided peda l press ure is m aintained, s o that th e wheel is agai n decel erated

(point B) . The c ontro l cyc le beg ins agai n. T here are approx im ately four t o six con trol c ycles per s econ d, dep ending

on the state of the road surface. This rate is made possible by rapid electronic signal processing and the short

response times of the solenoid valves.

Self-Monitoring

At the start of a journey, the system automatically carries out an operational check in accordance with a stored

program in the ABS or ABS/TCS control module. The signals generated during a braking process are simulated

and the signals transmitted to the hydraulic modulator are checked for their correctness.

During the journey the system monitors itself by comparing the logical sequence of input and output signals with

memorised limit values, in addition to monitoring the voltage supply.

If a system defect is detected, the ABS switches itself off and the driver can still use the conventional, non ABS

controlled braking system. This changeover is indicated by the illumination of an ABS warning lamp in the

instrument cluster.

Performance

When full braking power is applied, the vehicle is optimally braked while retaining its full directional stability and

control. T he AB S pr events wheel l ock -up abov e a m inim um speed of approx im ately 6 k m /h, whether on ice o r on a

dry road surface.

Figure 5B-13

Legend

Q No ABS Control

R With ABS – Maintaining Pressure

S With ABS – Reducing Pressure

T With ABS – Increasing Pressure

WS Wheel Speed

FP Brake Fluid Pressure

L Wheel Lock-Up

M Pressure Maintained

R Pressure Reducing

B Pressure Increasing

2.2 NORMAL CONDITIONS DURING ANTI-LOCK BRAKING AND

TRACTION CONTROL INTERVENTION

During anti-lock braking, a series of rapid pulsations are felt through the brake pedal. These pulsations occur as

solenoid valves within the underhood hydraulic modulator assembly change position to modulate brake hydraulic

pressure. Brake pedal pulsation continues until the vehicle is stopped or the ABS mode disengages.

The operation of the pump, also within the hydraulic modulator assembly, is characterised by rapid brake pedal

pulsation that is accompanied by some electric motor and pump noise. Pump operation may be perceived during

regular vehicle operation or during initial ABS or ABS/TCS control module self-test. While these functions sometime

cause driver concern, they are normal functions of ABS operation.

During trac tion control on V6 engined vehic les fitted with nor mal operatio n is less notic eable. Pum p operation ma y

still be heard, together with a power sag from the engine as the ABS/TCS control module requests the PCM to

bring engine torque into a specific range.

Traction control intervention on GEN III V8 engine vehicle fitted with ABS/TCS, operates in three stages; engine

spark retard, throttle angle reduction, and rear brake application.

The first is less noticeable; with only a power sag from the engine being felt as the ABS/TCS control module

requests the PCM to retard the engine spark as appropriate.

If the ABS/TCS contro l module continues to detect the rear wheels are rotating faster than the front, it will request

the throttle relaxer control module to reduce the throttle angle.

The final step taken to control the rear wheel is for the ABS/TCS control module to apply the rear brakes, thus

reducing the torque to the rear wheels.

W hen the vehic le re ac hes approx imately 6 km /h and pr ovided the AB S or A BS/T C S contr o l module do es no t s ense

a stop lam p switch input, after initial engine start-up and driving away, the ABS or ABS/TCS control module tests

the solenoid valves and pump. This self test can be heard by the driver and is a normal operating function of the

ABS. If the ABS or ABS/T CS control module does sense a stop lamp switch input, the self test will not occur until

the vehicle is travelling at approximately 18 km/h.

Normal function of the ABS, TC OFF and LOW TC warning lamps in the instrument cluster are as follows:

ABS lamp: should illuminate when the ignition is switched on and will go out approximately two seconds later.

Should the lamp not go out, the ABS or ABS/TCS control module has detected a system fault.

TC OFF lamp: should illuminate when the ignition is switched on and will go out approximately five seconds later

(or two seconds latter with engine running). If the lamp does not go out, either the ABS/TCS control module has

detected a system fault, or the system has been manually switched off.

LOW TC lam p: should illu minate when the ignition is switched on a nd will go ou t approxim ately two secon ds later.

This lamp will illuminate whenever the TCS system is engaged.

Techline

2.3 ABS AND ABS/TCS SYSTEM COMPONENTS

WHEEL SPEED SENSORS AND PULSE RINGS

Front Wheel Speed Sensors

Inductive wheel speed sensors (1) are used to

detect the rotational speed of each wheel. There

are specific wheel sensor assemblies for front and

rear wheels.

Signals generated by the wheel speed sensor are

transmitted to the ABS control module via a wheel

speed sensor lead, that has a ‘push-on’ type

connector with a locking tang, at the wheel speed

sensor end.

The front wheel speed sensors (1) are incorporated

as part of the front suspension front wheel hub

assembly.

Figure 5B-14

There are three specific front wheel hub

assemblies available. For vehicles with ABS or

ABS/TCS, there is a right and left, which

incorporates the wheel speed sensor and a 48

tooth magnet impulse ring. For non ABS vehicles,

a common hub is used for both sides.

Identification of the front wheel hub assemblies is

by the assembly part number etched on the outer

surface (1) of the hub wheel flange or by simply

noting whether a wheel speed sensor cap is fitted

to the hub (2).

CAUTION: During any service operation that

requires the replacement of the front hub

assembly on a vehicle equipped with ABS/TCS,

ensure that the correct replacement hub

assembly is installed, otherwise malfunctioning

of the ABS or ABS/TCS will occur.

NOTE 1: Always refer to the latest spare parts

information (PartFinder®) for the correct front

wheel hub assembly part numbers.

NOTE 2: Apart fr om wheel stud replac ement, ther e

are no serviceable items in the front wheel hub

assembly. With the unit being a ‘sealed for life’

assembly, there are no requirements for wheel

speed sensor and/or bearing adjustments. Should

a non-standard condition develop, then the hub

assembly must be replaced as complete unit.

T212L004

Figure 5B-15

Figure 5B-16 illustrates a sectioned view of the

front wheel sensor in the front hub assembly.

The components of the sensor are:

• magnetic impulse ring (1)

• coil (3)

• flux concentrator (4)

• coaxial connector (6)

The m agnetic impulse r i ng (1 ), attac he d to the f r ont

hub rotating member (2), is magnetised and

contains 48 individual magnets evenly spaced

around the ring.

On the flux concentrator (4) there are a

corresponding 48 evenly spaced teeth (5).

Magnetic flux (7), generated from the impulse

ring (1), is induced into the coil (3) via the flux

concentrator (4).

As the road wheel is rotated, the front hub inner

member and magnetic impulse ring rotate as one,

causing a variation of the magnetic flux generated

in the flux concentrator. This change in the

magnetic flux causes an alternating voltage to be

induced in the coil of the sensor.

Figure 5B-16

The frequency and amplitude of the induced

voltage are dependent on wheel RPM, the number

of turns of the coil, the magnetisation level of the

impulse ring and the number teeth of the flux

concentrator. Of all these factors, the only variable

is the wheel RPM, so the frequency and am plitude

of the output signal depend on the speed of wheel

rotation.

The dotted line (1) in Figure 5B-17 represents the

voltage generated by the wheel speed sensor

versus time (T) at low wheel speed.

The continuous line (2) in Figure 5B-17 represents

the voltage generated by the wheel speed sensor

versus time (T) at high wheel speed.

T212L005

Figure 5B-17

Rear Wheel Spe ed Se ns ors

The rear wheel speed sens or (1) basic ally consists

of a magnetic core and a coil. The pole tip (2) is

surrounded by a magnetic field. As the wheel turns,

the teeth of the p ulse r i ng ( 3) c ause c hang es in th is

magnetic field. The magnetic flux thereby changes

and an alternating voltage is induced in the coil of

the wheel speed sensor.

The pole piece on the outer surface of the sensor

is of a pl as tic cons tr uct ion and ther ef or e there is no

requirement to coat the outer surface with high

temperature grease when reinstalling sensor

assemblies (as on previous models).

The rear wheel speed se nsors have a hi gh voltage

output and therefore, there is no need to install

shim s between the s ensor and its m ating mounti ng

bracket.

Legend:

1. Wheel speed sensor

2. Pole tip

3. Pulse ring

4. Sensor output

T212L006

Figure 5B-18

The rear wheel speed sensors (1) are located in a

bracket which is part of the final drive rear cover.

Each pulse ring (2) is a toothed ring made of a

ferrous metal that rotates to allow the wheel speed

sensor to read the rotational speed of each rear

wheel.

The rear wheel pulse rings are part of the final

drive inner axle flanges and are not serviced

separately.

As the road wheels rotate, the wheel speed

sensors generate an AC electrical signal

proportional (in frequency and amplitude) to the

wheel speed . The ABS or AB S/TCS c ontrol module

uses wheel speed signals to determine when anti-

lock control or traction control is required.

Specifically, the module uses wheel speed sensor

signals to find out whether any of the wheels are

decelerating rapidly (locking) or accelerating

rapidly (slipping).

The ABS and ABS/TCS systems are calibrated to

use tyres of a known rolling radius and pulse rings

with a specific number of teeth. The number of

teeth on the pulse rings correspond directly to tyre

size. If one of the tyres f itted to t he veh icle is l arger

or smaller (not to original equipment size) than the

remainder of the tyres on the vehicle, the ABS or

ABS/TCS control module will not modulate brake

system hydraulic pressure properly.

T212L008

Figure 5B-19

Improper system operation occurs because the wheel speed signal from the off-size tyre makes the module think

that one wheel is accelerating or decelerating faster than the others.

NOTE: IT IS IMPORTANT THAT THE VEHICLE ONLY BE EQUIPPED WITH THE ORIGINAL EQUIPMENT

TYRE SIZE AS NOMINATED ON THE VEHICLES TYRE PL ACARD. CHANGING TYRE SIZE COULD AFFECT

SYSTEM FUNCTION.

ABS AND ABS/TCS CONTROL MODULE (Refer Figure 5B-20)

The ABS or ABS/TCS control module (1) evaluates the signals from the wheel speed sensors and computes the

permissible wheel slip for optimum braking and traction.

During ABS, it regulates the necessary braking pressure in the brake calipers by means of solenoid valves within

the hydr aulic m odulator as semb ly (2). The ABS or A BS/TCS c ontrol m odule test s the s ystem in accordance with a

defined program and monitors it during driving.

The ABS/T CS contr ol m odule a lso m onitor s both fr ont and r ear wh eel sp eeds thr ough the whee l speed s ensors for

wheel slip. If at any time during acceleration the ABS/TCS control module detects drive wheel slip, it will act to bring

excess engine torque into a specific range. How this is achieved, depends on the engine fitted to the vehicle.

V6 Engined Veh ic les

• Engine Control: This is ac complishe d via t wo high sp eed Puls e W idth Modulate d (PW M) circuits between t he

ABS/TCS control module and the PCM. The PCM will then adjust spark firing and air/fuel ratio, altering the

boost duty cycle (Supercharged engine only), and shutting OFF up to five (5) injectors (if necessary), and

report the modified torque value (on the Torque Achieved circuit) back to the ABS/TCS control module.

• Brak e Application : Simultaneously with engine torque management, the ABS/TCS control module will activate

the ABS isolator valves, turn on the ABS pump motor and supply brake pressure to the over-spinning wheel/s.

GEN III V8 Engine Veh icles

• Spark adv ance: Re qu esting the PCM to r etard the amount of spark adva nce, v ia the spar k r etard circ uit, circ uit

1687 (Grey/Black wire).

• Throttle angle reduction: Sending a message to the throttle relaxer control module, via the requested throttle

position line (DKR), circuit 463 (Orange/White wire), to reduce the throttle angle. The throttle relaxer control

module achieves this by driving the throttle relaxer motor, which in turn pulls back the throttle cable, reducing

the throttle body opening.

The throttle relaxer control module sends a signal back to the ABS/TCS control module via the actual throttle

position line (DKI), circuit 464 (Black/White), reporting on the actual throttle position.

• Brake application: The ABS/TCS control module will activate the ABS isolator valves, turn on the ABS pump

motor and supply brake pressure to the over-spinning wheel/s.

The ABS/TCS control module (1) is integrated with the hydraulic modulator (2) and there are different control

modules used in MY 2003 VY and V2 Series vehicles for ABS and ABS/TCS systems. It is physically impossible to

fit an ABS control module to an ABS/TCS hydraulic modulator or an ABS/TCS control module to a ABS hydraulic

modulator. However, if replacing an ABS or ABS/TCS control module, always refer to the latest PartFinder® Parts

Information for the correct control module part numbers.

NOTE: View ‘A’ is for RHD vehicles, while view ‘B’ is for LHD vehicles.

Figure 5B-20

HYDRAULIC MODULATOR (Refer Figure 5B-20)

The hydraulic modulator (2) for the ABS consists of six solenoid valves (three inlet and three outlet), two

accumulators, one for the front brake circuits and the other for the rear brake circuit and a brake fluid return pump.

The h ydraulic m odulator ( 2) for the ABS/T CS system consists of ten so lenoid valves ( four inle t, four o utlet and t wo

TCS s olenoi d valves ), t wo accum ulators , one for the f ront brak e circ uits a nd the other for th e rear brak e c ircuit a nd

a brake fluid return pump.

The solenoid valves are actuated by the ABS/TCS control module (1). Depending on the switching stage, they

connect the wheel brake calipers either with the brake master cylinder (3) or with the pump assembly, or

disconnect the wheel brake caliper from both the circuit and pump. When pressure is reduced, the return pump

conveys the brake fluid flowing out of the wheel brake cylinders back into the brake master cylinder via the

corresponding accumulator. The accumulators serve to temporarily accommodate the brake fluid 'surplus' which

suddenly occurs following a drop in pressure.

THROTTLE RELAXER

Only utilis e d when the GEN III V8 e ng ine is f itted to

a vehicle with ABS/TCS, the throttle relaxer is

mounted on the cockpit module, in the engine

compartm ent. The thrott le r elaxer co nsists of: three

pulleys (2), a dust cover (1) and a motor (3).

The accelerator pedal cable is connected to the

centre (B) of the three pulleys. The throttle cable

(throttle relaxer to throttle body cable) attaches to

the bottom (A) of the three pulleys. If the vehicle is

fitted with cruise control, the cruise control cable

attaches to the top pulley (C).

Via a raised lug on pulley B, through an elongated

slot in pulley C, pulleys B and C are connected to

each other. This allows for the operation of the

cruise control, and interruption free movement of

pulley B (accelerator pedal position) when the

cruise control is not in operation.

T212L009

ABC1

Figure 5B-21

Pulle ys A and B ar e c on ne c ted to e ac h oth er v ia an in ter nal spring . Und er nor mal operating co nd iti ons , th e lo ad

applied to pulleys B and C (accelerator pedal and cruise control actuator load) is transferred through the

internal spring to pulley A and onto the throttle body.

During TCS intervention, the throttle relaxer motor controls pulley A regardless of the accelerator pedal position.

The internal s pri ng betwee n pulle y A and B is com pr essed and theref ore, the acc elerat or pedal is overr idden . A

slight sensation on the accelerator pedal can be felt during this stage.

If the cruise control is engaged and the TCS intervenes, the cruise control will automatically be disengaged.

THROTTLE RELAXER CONTROL MODULE

Only required when the GEN III V8 engine is fitted

to a vehicle with ABS/TCS, the throttle relaxer

control m odule (1) is loc ated behind the p assenger

side shroud lower trim assembly, next to the

Powertrain Interface Module (PIM).

NOTE: The locat ion of the Throttle Re laxer C ontrol

Module is the same in all vehicles fitted with the

GEN III V8 engine.

The throttle relaxer control module uses input

information received from both the throttle position

sensor and the ABS/TCS control module.

The ABS/TCS control module communicates with

the throttle relaxer control module via Pulse Width

Modulated (PWM) signals sent and received on

two circuits; DKR circuit 463 (Orange/White wire)

and DKI circuit 464 Black/White wire). “DKR”

translates to the requested throttle position; “DKI”

translates to the actual throttle position.

Diagnostic Trouble Codes DTCs for the throttle

relaxer are incorporated into the ABS/TCS control

module.

Figure 5B-22

ABS WARNING LAMP

Located in t he instrum ent cluster, the A BS warning

lamp is part of the driver warning system.

The ABS warning lamp is controlled by the ABS or

ABS/T CS c ontr o l module a nd is il luminate d to warn

the driver that a utomatic an ti- lock brak ing c apab il ity

is totally inhibited. This does not affect the

operation of the vehicle's conventional braking

system.

The ABS warning lamp will illuminate when:

1. The ignition is turned on. The lamp will go out

after a stationary 'Self Check' is completed

(two to five seconds).

2. The ABS or ABS/TCS control module detects

an ABS electrical wiring or component

problem.

3. T he ABS or AB S/TCS control module det ects a

problem within itself.

These conditions are part of the ABS self-

check.

Figure 5B-23

4. When using Tech 2 in certain diagnostic modes for ABS/TCS diagnosis, the ABS/TCS system is disabled by

the ABS/TCS control module while it is communicating with Tech 2.

Should the ABS warning lamp lose power (from fuse F13 ignition fuse) or the ABS control module lose earth

(terminals A37, X1 16 and X1 16), the ABS warning lamp will not illuminate at any time.

ELECTRONIC TRACTION CONTROL (TCS) WARNING DISPLAYS

There ar e two electronic tr action contr ol warning d ispla ys in the instrum ent panel Multi Functio n Displa y (MFD) (1);

‘TRAC OFF’ (‘A’) and ‘LOW TRAC’ (‘B’).

The ‘T RAC OFF’ warn ing displa y (‘A’) is c ontrolled b y the ABS/T CS control module, v ia the seria l data bus c ircuit,

and will be activated to warn the driver that the TCS system has been disabled.

The ‘TRAC OFF’ warning display will be activated when:

1. The ignition is turned on. The display will de-activate after a stationary 'Self Check' is completed (two to five

seconds).

2. When the TCS system is manually switched off, via the traction control switch.

3. The ABS/TCS control module detects an TCS electrical wiring or component problem.

4. The ABS/TCS control module detects a problem within itself.

Figure 5B-24

5. W hen using Tech 2 in certain diagnostic modes for ABS/TCS diagnosis. The ABS/TCS system is disabled by

the ABS/TCS control module while it is communicating with the Tech 2.

Should th e ‘TRAC OFF’ or ‘LOW TR AC’ warning displa ys lose power (fr om fus e F13 igniti on fuse) neither of these

lamps will activate. Also, if the ABS/TCS control module loses earth (terminals A37, X1-16 and X1-19), the ‘LOW

TRAC’ warn ing disp lay will not activ ate.

The ‘LOW TRAC’ warning display is also controlled by the ABS/TCS control module and will be activated for two

seconds when the ignition is switched on and then go out, or when the ABS/TCS control module is controlling

wheel spin, indicating that the vehicle is in a critical situation.

ELECTRONIC TRACTION CONTROL (T/C) SWITCH

Automatic Transmission

In certain circumstances (i.e. if the vehicle became bogged but could be ‘rocked out’) it may be necessary to

disable th e electronic traction c ontrol s ystem (TCS) . This is achie ved by pressi ng the ‘T/C’ butto n, located n ear the

transmission selector, as shown. If the traction control system is switched off, the ‘T/C’ displa y will be activated in

the Multi Function Display (MFD) in the Instrument (refer Figure 5B-25, view ‘A’). The system can be switched on

again by either pressing the ‘T/C’ button again or when the ignition is next cycled (off to on).

View ‘A’ that follows shows the ‘T/C’ off button (1) location for Right Hand drive models, while view ‘B’ shows the

Left Hand drive arrangement.

Figure 5B-25

Manual Transmission

On vehicles with manual transmission, the

electronic traction control disabling s witch (‘T/C’) is

located in the rear of the centre console in the

position shown (1).

If the traction control system is switched off, the

‘TRAC OFF’ display will be activated in the Multi

Function Display (MFD) in the Instrument (refer

Figure 5B-26). The system can be switched on

again by either pressing the ‘T/C’ button again or

when the ignition is next cycled (off to on).

NOTE 1: If the electronic traction control system is

commanded off, the ABS will still function normally.

NOTE 2: If the button is depress ed and held for 10

or mor e seconds, the ABS/ TCS control m odule will

see this as a short circuit and the TCS will be

permanently enabled (for that ignition cycle) until

the ignition is switched off and the engine

restarted. Additionally, the TRAC OFF warning

display (if activated) will be turned off until the

ignition is switched off and the engine restarted.

Figure 5B-26

BRAKE MASTER CYLINDER

On MY 2003 VY and V2 Series vehicles, regardless of the engine f itted, a com mon brake master cylinder is used

on vehicles with standard, ABS and ABS/TCS brake systems. The only difference being that the master cylinder

used with AB S and A BS/TCS s ystems has a s c rew- in bla nking p lug ( 1) installed and t ig hten ed into th e lo we r of two

front brake outlets in the master cylinder. Pipe (2) is the rear brake outlet and pipe (3) is for the front outlet.

NOTE: View ‘A’ is for RHD vehicles, while view ‘B’ is for LHD vehicles.

Figure 5B-27

ABS & TCS FUSES

An ABS 60 Amp fusible link, X18_F103, is incorporated in the underhood electrical centre.

The thro ttle relax er and th rottle re laxer c ontrol m odule (G EN III V8 onl y) are supp lied vo ltage via f use X17_F 36 ( 15

Amp) , also locat ed in the u nderh ood el ec tr ical ce ntr e.

An additional 10 Amp fuse, X42_F27 is used for the ABS and is located in the interior electrical centre.

The ABS OFF, TRAC OFF & LOW TRAC warning displays are supplied voltage via fuse X44_F11 (7.5 Amp)

located in the interior electrical centre.

View ‘A’ shows the Right Hand drive locations while view ‘B’ shows them for the Left Hand drive models.

Figure 5B-28

STOP LAMP SWITCH

Located in the brake pedal support, the stop lamp

switch provides a BRAKES APPLIED 12 volt input

signal to terminal X1-14 of the ABS or ABS/TCS

control module connector A37. W henever the ABS

or ABS/TCS co n tr ol modul e rec ei ves t his s i gna l th e

ABS control cycle will begin. If the driver pumps the

brake pedal during the ABS operation, the control

cycle will be reset.

The stop lamp switch is a normally ‘open’ switch

that supplies batter y voltage to the stop lam ps and

terminal X1-14 of the ABS or ABS/TCS control

module, when closed. When the switch is open

(brakes not applied), terminal X1-14 of the ABS or

ABS/TCS control module is earthed through the

stop lamps, causing the voltage at terminal X1-14

to be pulled low (less than 0.2 volts)

Also, if the ABS or ABS/TCS control module

senses a stop lamp switch input, the self test will

not occur until the vehicle is travelling at

approximately 18 km/h.

Figure 5B-29

For all service operations on the stop lam p switch,

refer to Section 12B LIGHTING SYSTEM in the

MY 2003 VY and V2 Series Service Information.

2.4 INSTALLATION POSITION OF ABS AND ABS/TCS COMPONENTS

The following figures illustrate the installed positions of the various ABS and ABS/TCS components fitted to MY

2003 VY and V2 Series vehicles. The series of illustrations are arranged with the RHD version presented first,

followed by the equivalent for the LHD. Where an arrangement is common to both Right and Left drive vehicles,

notation is made to that effect.

Figure 5B-30

RHD Brake Master Cylinder and Hydraulic Modulator Locations – ABS or ABS/TCS With V6 Engines

Legend

1. Nut – Hydraulic Modulator/Control

Module Retaining 2. Hydraulic Modulator/Control

Module Assembly 3. Brake Master Cylinder/Vacuum

Booster Assembly

Figure 5B-31 – RHD & LHD – ABS/TCS Hydraulic Modulator, Throttle Relaxer Module and PCM Locations –

GEN III V8 Engine

Legend

1. ABS/TCS Hydraulic Modulator

– All Engines 2. Throttle Relaxer Module

– GEN III V8 Only 3. Powertrain Control Module (PCM)

– GEN III V8 Engine Only

Figure 5B-32 – RHD Wiring Harness and Relaxer Cable Installation for ABS/TCS – GEN III V8 Engine

Legend

1. ABS/TCS Control Module Connector

2. Main Wiring Harness

3. Powertrain Harness Connector to PCM

4. Powertrain Control Module (PCM)

5. Throttle Relaxer

6. Powertrain Harness to Throttle Relaxer

7. Throttle Relaxer Cover

8. Cruise Control Cable

9. Accelerator Cable

10. Throttle Cable

Figure 5B-33 – LHD Wiring Harness and Throttle Relaxer Cable Installation for ABS/TCS – GEN III V8 Engine

Legend

1. ABS/TCS Control Module Connector

2. Main Wiring Harness

3. Powertrain Harness Connector to PCM

4. Powertrain Control Module (PCM)

5. Throttle Relaxer

6. Powertrain Harness to Throttle Relaxer

7. Throttle Relaxer Cover

8. Cruise Control Cable

9. Accelerator Cable

10. Throttle Cable

Figure 5B-34 – RHD & LHD – Front Wheel Speed Sensor Lead Routing – All Engines

Legend

1. Front Wheel Speed Sensor and Lead Assembly 2. Main Wiring Harness 3. Retaining Clip

Figure 5B-35 – RHD Hydraulic Pipe Routing – All Engines

Legend

1. Clip – 3 places

2. Master Cylinder to Modulator Rear Pipe

3. Master Cylinder to Modulator Front Pipe

4. Modulator to Rear Brake Hose (With TCS)

5. Modulator to LHF Brake Hose

6. Modulator to RHF Brake Hose

7. Without TCS – Modulator to Rear Brake Pipes

With TCS – Modulator to LHR Brake Hose

8. Front Brake Caliper

9. Front Brake Hose

10. Brake Hose and Washers to Front Brake Caliper

Figure 5B-36 – LHD ABS/TCS Hydraulic Pipe Routing – All Engines

Legend

1. Modulator to LHR Brake Hose

2. Master Cylinder to Modulator Rear Pipe

3. Modulator to RHR Brake Hose

4. Master Cylinder to Modulator Front Pipe

5. Modulator to LHF Brake Hose

6. Modulator to RHF Brake Ho se

7. Master Cylinder and Brake Booster

8. Front Brake Caliper

9. Front Brake Hose

10. Brake Hose and Washers to Front Brake Caliper

Figure 5B-37 – RHD & LHD Body Harness Installation for ABS & ABS/TCS –All Engines

Legend

1. Wiring Harness Connector, Modular Fuel Sender

2. Body Harness 3. Wheel Speed Sensor and Cable Assembly – Rear

4. Clip – Wheel Speed Senor Cable Retaining

2.5 ABS PRINCIPLES OF OPERATION – EXCLUDING ABS/TCS

NON-ANTI-LOCK BRAKING

Under normal braking conditions, the anti-lock braking system functions much like a conventional braking system .

Brake fluid pressure is provided by the brake master cylinder and the power booster.

For non-ant i-lock braking, h ydraulic pr essure is applied to the brak e calipers without any inter vention f rom the ABS

At this t ime, the hydraulic modulator establishes an open two-wa y f luid pat h from the m aster cylinder to the brake

calipers. Normal braking (no ABS) occurs when the wheel sensors do not detect wheel lock-up tendencies.

However, even thr ough t he AB S is pas sive duri ng nor m al braking, th e ABS c ontrol module is c onstant ly monitor in g

for rapid deceleration of any of the wheels and a sign al from the brak e switch (brakes applied input). Rapid whee l

deceleration during a braking operation could indicate wheel lock-up.

ANTI-LOCK BR AKING

When the ABS senses any tendency for wheel lock-up, it enters the anti-lock mode. During anti-lock braking, the

ABS m odulates h ydraulic pr essure in the brak e circ uits to control whee l slip to 10 – 20%. F or anti-lock braking, the

ABS control module controls current flow to the hydraulic modulator solenoid valves to control (by maintaining,

decreasing or increasing) hydraulic pressure in the brake circuits.

NOTE: The hydraulic modulator cannot increase brake circuit hydraulic pressure above the pressure supplied by

the brake master cylinder.

ABS CONTROL MODULE OPERATION

Inputs

The following ABS components send signals to the ABS contro l module where the y are evaluated in order for the

module to maintain and control wheel slip.

1. Ignition on input, (via fusible link F103, ignition switch S149, fuse F27) – ABS control module A37, terminal

X1 15.

2. Wheel speed sensor inputs – ABS control module A37 terminals X1 1 and 2 (RHR), X1 4 and 5 (RHF), X1 6

and 7 (LHF) and X1 8 and 9 (LHR).

3. Brakes applied input (from brake lamp switch) – ABS control module 37, terminal X1 14.

4. Battery voltage – ABS control module A37 terminals X1 17 and 18.

5. Serial data (input and output) – ABS control module A37, terminal X1 11.

Outputs

To control the anti-lock braking system, the ABS control module sends command signals to the following

components.

1. Valve relay/solenoid valves – internal control.

2. Pump relay/pump motor – internal control.

3. Serial data (input and output) – ABS control module terminal No. 11.

4. Self diagnostic 'Flash Code Actuation' – ABS control module terminal No. 12.

5. ABS warning lamp – ABS control module terminal No. 21.

W ith the igniti on s witch in t he ON posit ion, b atter y volt age is appl ied to the A BS c ontrol m odule term inal N o. 15 via

fuse F27. This then enables the ABS control module and battery voltage is applied to the pump motor relay and

valve relay. Neither of the relays operate until they receive an earth from the ABS control module.

Also, batt ery vo ltage is suppli ed to the ABS war ning la mp via f use F13. T he warni ng lam p will not i lluminate until it

is earthe d by the AB S control m odule. If the A BS module is not conn ected, term inals 19, 20 a nd 21 will b e shorted

together within the connector and the ABS warning lamp will be illuminated.

Wheel speed sensors are located at each front wheel and at each final drive inner axle flange. When the vehicle

starts moving, all of the speed sensors create signals that are sensed by the ABS control module at terminals 1 and

2, 4 and 5, 6 and 7, 8 and 9. These signals are AC electrical pulses that are proportional (in frequency and

amplitude) to wheel rotational speed.

Once the vehicle has b een s tarted and dr iven o ver a pprox im ately 6 km /h, the cont rol m odule p erf orm s an ABS s elf

test. The control m odule test cycles each solenoid valve and the return pum p in the hydraulic modulator to check

component operation. The control module checks its own logic section and circuitry. If errors are detected during

this test, the control module will earth terminal 21, illuminating the ABS warning lamp to warn the driver of a

problem with the system. The ABS control module remains deactivated until the next ignition switch OFF to ON

cycle when the process is repeated and if errors are detected again, the ABS warning lamp will be illuminated.

The ABS self test occurs once each ignition cycle as follows:

1. After receiving an ignition 'ON' input, the control module earth’s and activates the valve relay.

2. When the vehicle reaches approximately 6 km/h, the control module tests the solenoid valves and the return

pump in the modulator. This test can usually be heard and/or felt by the driver.

3. If the pump or solenoid valves fail to operate, the ABS will be disabled and the ABS warning lamp will be

illuminated.

4. As soon as the ABS control module receives a signal from any of the wheel speed sensors, it checks wheel

speed sensor output. If any of th e wheel speed sensor signals are no t detected, or are incorrect, the ABS will

be disabled and the ABS warning lamp will be illuminated.

Once the vehicle is moving, the control module continuously monitors itself and the following components:

1. Solenoid valves.

2. Wheel speed sensors.

3. Wiring harness and relays.

4. Battery voltage.

If battery voltage drops below approximately 9 volts, the ABS will be disabled and the ABS warning lamp will be

illuminated.

During braking applications, if one or more wheels start to decelerate too quickly, the ABS is engaged and the

modulatio n proc ess b egins . W heel s peed inf orm ation s ent to th e AB S contro l m odule is proces sed and th e modu le

determines proper solenoid valve operation in the modulator. The modulator contains six solenoid valves; two for

each front wheel with the rear wheels both having two common solenoid valves.

Figure 5B-38 – ABS Circuit – V6 Engines

HYDRAULIC MODULATOR OPERATION

The hydraulic modulator executes ABS control module commands using six solenoid valves. These solenoid

valves, located in the hydraulic modulator assembly, are in series with the brake master cylinder and the brake

circuits. The hydraulic modulator solenoid valves are activated separately by the ABS control module

corresponding to various ABS control phases:

1. Non-ABS Braking

2. Maintaining Pressure

3. Reducing Pressure

4. Increasing (Building-up) Pressure

The hydraulic modulator assembly contains six solenoid valves and a brake fluid return pump; however, for

explanat ion of the operation only one accum ulator and two solenoid valves will be described. The operation is the

same for all three circuits.

Non-ABS Braking

During this condition, the solenoid valves 2a and

2b are not activated. Valve 2a (pressure holding

(inlet) solenoid valve) is open (A). This allows

brake fluid to flow in either direction between the

brake master cylinder and the brake caliper,

providing for conventional non-ABS braking. The

solenoid valve 2b (pressure release (outlet)

solenoid valve) is closed (B), blocking off the

passage to the accumulator and the return pump.

This allows the maximum brak e apply pressure (2)

to be developed (‘A’), with the controlled

deceleration of wheel speed (1).

Figure 5B-39

The brake master cylinder (1) applies hydraulic pressure to the brake circuits (3). If the ABS control module (5)

does not detect any rapid wheel deceleration, the ABS will remain passive at this time.

Figure 5B-40

Legend

1. Brake Master Cylinder

2. Hydraulic Modulator

2a. Pressure Holding Inlet Solenoid Valve

2b. Pressure Releas e Outlet Solenoid Valve

2c. Accumulator

2d. Return Pump

3. Brake Caliper

4. Wheel Speed Sensor

5. ABS Control Module

6. Pulsation Damper

Maintaining Pres su re

When the ABS control module detects excessive

wheel deceleration (based on the wheel speed

sensor (4) signal), it commands the pressure

holding (inlet) solenoid valve (2a) to close,

maintaining brake circuit pressure (A). It does this

by earthing the respective circuit, therefore

allowing a current flow through the coil of solenoid

valve 2a. This causes the armature and valve to

mo ve downwar d, iso lating t he brak e circ uit (3) f rom

the master cylinder.

Solenoid valve 2b also remains closed (B).

Figure 5B-48 shows that, with a rapidly

decelerating wheel speed (1), the brake apply

pressure (2), is maintained (‘A’). This results in the

wheel speed deceleration rate slowing down.

Figure 5B-41

NOTE: With the brake circuit isolated, brake circuit pressure between the modulator and the brake caliper circuit

remains constant despite increased master cylinder hydraulic pressure.

Figure 5B-42

Legend

1. Brake Master Cylinder

2. Hydraulic Modulator

2a. Pressure Holding Inlet Solenoid Valve

2b. Pressure Releas e Outlet Solenoid Valve

2c. Accumulator

2d. Return Pump

3. Brake Caliper

4. Wheel Speed Sensor

5. ABS Control Module

Reducing Pres s ure

If isolation of a brake circuit between the brake

master cylinder and the brake caliper does not

reduce the excessive wheel deceleration, the ABS

control m odule ( 5) com m ands the pr essur e releas e

(outlet) solenoid valve (2b) to reduce hydraulic

brake pressure in the brake circuit.

During this phase, the ABS control module earths

the coil of the solenoid valve 2b, al lowing a current

flow through the coil windings. This causes the

armature and valve to move downward, opening a

passage (B) from the brake circuit to the

accumulator (2c) and the return pump inlet (2d).

At this stage, both solenoid valves (2a and 2 b) are

activated simultaneously.

Figure 5B-43

NOTE: At this tim e, the brak e circ uit is isol ated fr om the m aster cylinder b y the re turn p ump val ving an d the retur n

pump is energised.

This action sends brak e fluid f rom the brak e circuits back to the mas ter cylinder a gainst brak e pedal pres sure. The

return pump continues to operate during the rest of the anti-lock cycle.

Figure 5B-44

Legend

1. Brake Master Cylinder

2. Hydraulic Modulator

2a. Pressure Holding Inlet Solenoid Valve

2b. Pressure Releas e Outlet Solenoid Valve

2c. Accumulator

2d. Return Pump

3. Brake Caliper

4. Wheel Speed Sensor

5. ABS Control Module

Accumulators

During the 'Reducing Pressure' reduction phase of ABS modulation, the accumulators (2c) temporarily store fluid

from the brak e cir cuits. So m e road c onditions r equire the re lief of a lar ge vol um e of f luid fr om the br ake c aliper s. In

such cond itions, the ac cumulat or guarantees pr essure reduc tion. As soo n as the s olenoid valve ( 2b) moves to the

'Reduction Pressure' pos ition, brak e fluid from the brak e circuit flows into the ac cumulator. T hus, before t he return

pump ( 2d) starts opera tion, the accumulator allows an im mediate pres sure reduct ion in the br ake circuit. T he fr ont

brak e cir cuits s hare a common acc um ulator. T he r ear br ake circuit us es a s epar ate acc umulator . T he ac c umulators

are spring-loaded and designed to operate at less than 1,000 kPa.

Increasing (Building-up) Pressure

The wheel accelerates again as a result of the

reduced braking pressure. Upon reaching a

specific limit, the ABS control module registers the

fact that the wheel is now not being braked

sufficiently.

The ABS control module then de-energises both

solenoid valves and the for merly reduced pressure

is then increased so that the wheel is again

decelerated. The ABS control cycle begins again.

There are approximately 4 to 6 control cycles per

second, depending on the state of the road

surface.

NOTE: Circuit pressure cannot increase above

master cylinder pressure.

Figure 5B-45

Figure 5B-46

Legend

1. Brake Master Cylinder

2. Hydraulic Modulator

2a. Pressure Holding Inlet Solenoid Valve

2b. Pressure Releas e Outlet Solenoid Valve

2c. Accumulator

2d. Return Pump

3. Brake Caliper

4. Wheel Speed Sensor

5. ABS Control Module

6. Pulsation Damper

MASTER CYLINDER OPERATION

The operation of the master cylinder assembly used on vehicles with ABS is the same as the assembly used on

vehicles without A BS ; r ef er to Section 5A SERVICE AND PAR K BRAKING SYSTEMS in the MY 2003 VY and V2

Series Service Information for details.

OPERA TION AND TESTING OF THE ABS WARNING LAMP

Should a ve hicle equip ped with ABS co me into the work shop with one of the f ollowing custom er comp laints, mak e

sure of the circumstances before checking the complete ABS with the Tech 2 diagnostic scan tool.

1. Warning lamp does not illuminate after switching on the ignition.

2. Warning lamp does not go out after engine has started.

3. Warning lamp illuminates again while driving or illuminates occasionally.

The following gives information about the functioning and malfunctioning of the ABS warning lamp.

ABS Warning Lamp

W hen the ignit ion is s witched o n, the warning lam p

illuminates for approximately 2 seconds. During

this period of time, the ABS control module

performs a check of the ABS system wiring.

On all vehicles with ABS, as soon as all four

wheels of the vehicle exceed a speed of

approximately 6 km/h for the first time after

starting, the ABS system tests itself automatically

(ABS 'Self-Test'). The ABS control module cycles

each solenoid valve and the return pump motor to

check component operation. The ABS control

module also checks its own circuitry.

This procedure is repeated every time the ignition

is s witched O FF and t he e ngine is star ted again. In

addition, the ABS constantly tests itself while the

ve hicle is travelling.

The warning lamp is also used for self diagnosis

purposes.

Figure 5B-47

Incorrect Warning Lamp Indications

1. Warning lamp does not illuminate after switching ignition ON.

2. Warning lamp does not go out after approximately 2 seconds.

3. Warning lamp illuminates when driving or illuminates occasionally.

Illumination of the ABS warning lamp indicates to the driver that the ABS is defective.

When the ABS warning lamp is activated, the vehicle reverts to normal braking as in vehicles without ABS fitted

(i.e. under emergency braking, wheel/s may lock).

Occas ional il lumination of the warning lamp ma y be brought about throu gh the ba ttery being insuf f icient l y charged.

The lamp lights up only as long as there is a low voltage, eg. after switching on electrical components at idle.

The c auses of any m alfunctions can be determined with the assis tance of the T ech 2 diagnostic scan tool a nd the

appropriate diagnostic table.

2.6 ABS/TCS PRINCIPLES OF OPERATION - EXCLUDING ABS

NON-ANTI-LOCK BRAKING / NON-TRACTION CONTROL

Under normal braking and driving conditions, the anti-lock braking system functions much like a conventional

braking system. Brake fluid pressure is provided by the brake master cylinder and the power booster.

For non-ant i-lock br aking, hydraul ic pressure is applied to the brak e caliper with out any interve ntion from the ABS.

At this t ime, the hydraulic modulator establishes an open two-wa y f luid pat h from the m aster cylinder to the brake

caliper. Non-anti-lock braking occurs when the wheel sensors do not detect wheel lock-up tendencies. However,

even though the ABS is passive during normal braking, the ABS/TCS module is constantly monitoring for rapid

acceleration (wheel slip) and deceleration (wheel lock) of any of the wheels and a signal from the brake switch

(brakes applied input).

ANTI-LOCK BR AKING

When the ABS senses any tendency for wheel lock-up, it enters the anti-lock mode. During anti-lock braking, the

ABS m odulates hydraulic pressur e in the brake circ uits to control wheel sli p to 10 - 20%. For anti-l ock brak ing, the

ABS control module controls current flow to the hydraulic modulator solenoid valves to control (by maintaining,

decreasing or increasing) hydraulic pressure in the brake circuits.

NOTE: The hydraulic modulator cannot increase brake circuit hydraulic pressure above the pressure supplied by

the brake master cylinder during anti-lock braking.

ELECTRONIC TRACTION CONTROL

W hen the ABS/TCS control module s enses spin fr om the dr ive wheels du e to too much engine tor que for the road

conditions, it enters the traction control mode. While the ABS/TCS module monitors both front and rear wheel

speeds through the wheel speed sensors, the action taken will change, depending on the engine fitted to the

vehicle.

V6 Engined Veh ic les

During acceleration, if the ABS/TCS module detects drive wheel slip at any time, it will request (on the Torque

Request circuit) the Powertrain Control Module (PCM) to bring engine torque into a specific range. This is

accomplished via two high speed Pulse Width Modulated (PWM) circuits between the ABS/TCS module and the

PCM. The PCM wi ll the n adj ust spar k firing and a ir/fuel r atio, alterin g boos t dut y c ycle ( Superc harged engin e onl y),

and shutting OFF up to five (5) injectors (if necessary), and report the modified torque value (on the Torque

Achieved circuit) back to the ABS/TCS module. Simultaneous with engine torque management, the ABS/TCS

module will activa te the ABS isolation valves, turn on the ABS pum p motor and supply brake pressure to the over

spinning wheel(s).

GEN III V8 Engined Ve hicl es

If at any time during acceleration, the ABS/TCS module detects drive wheel slip, it will request:

• The PCM, via the spark retard circuit, to retard the amount of spark advance.

• The throttl e r el axer c ontro l module to r e duce the engine thr ott le ope ni ng by a cer t ain perc ent age to bring en g ine

torque into a specific range.

The throttle relaxer control module accomplishes this by commanding the throttle relaxer to override the

accelerator pedal cable and physically reduce the throttle body butterfly opening by winding the throttle cable

back.

T his is achieved via two hi gh speed Pulse Width Mod ulated (PW M) circuits between the AB S/TCS m odule and

the throttl e r e laxer c on tr ol module. T he A BS/TCS c o n tr ol module s ends a mes s age to the thr ot tle r el axe r c o ntr ol

module on the requested throttle position (DKR) circuit. The throttle relaxer control module then reports the

modified throttle position opening back to the ABS/TCS control module via the actual throttle position (DKI)

circuit.

Simultaneously with eng ine s par k retard and throttl e p os ition i nter vent io n, th e A B S/TCS contr ol module will ac tiv ate

the ABS isolation valves, turn on the ABS pump motor and supply brake pressure to the over spinning wheel(s).

The isolation valves isolate the front brake hydraulic circuits from the master cylinder and rear brake hydraulic

circuits. Once the rear brake hydraulic circuits are isolated, pressure can be applied to the rear wheels without

aff ecting an y other brak e hydraul ic circuits . The AB S/T CS hydraulic module opens the priming valve, a llowing f luid

to be drawn from the master cylinder to the pum p motor, which is then activated, building pressure. The hydraulic

module, in let and outlet va lves begin c ycli ng and the switchi ng valve clos es, ensuring f luid is direct ed to the wheel

and not back into the master cylinder.

The inlet and outlet valve cycling assists in obtaining maximum road surface traction in the same manner as the

Anti-Lock Brake mode. The difference between Traction Control and Anti-Lock Brake mode is that brake fluid

pressure is increased to lesson wheel spin (Traction Control mode), rather then reduced to allow greater wheel spin

(Anti-Lock Brake mode).

If at any time during Traction Control mode, the brakes are manually applied, the brake switch signals the

ABS/TCS module to inhibit brake intervention and allow for manual braking. However, engine intervention (V6

engines) or, throttle reduction and spark retard intervention (GEN III V8), can still occur if necessary.

ABS/TCS CONTROL MODULE OPERATION

Inputs

The f ollowing com ponents, send signals to the AB S/TCS contr ol m odule, where t hey are eva luated in ord er for the

module to maintain and control wheel slip/spin.

1. Ignition on input, (via fusible link F105, ignition switch, fuse F27) - ABS/TCS module terminal X1- 15.

2. W heel speed sensor inputs - ABS/TCS module terminal No’s. LHF X1-6 and X1-7, RHF X1-4 and X1-5, LHR

X1-8 and X1-9, and RHR X1-1 and X1-2.

3. Brakes applied input (from brake lamp switch) - ABS/TCS module terminal X1- 14.

4. Batt er y volta ge - AB S/T C S module term inals X1- 17 an d X1-18.

5. V6 Engines: Actual Torque (torque acknowledgment) - ABS/TCS module terminal X1-27.

GEN III V8 Engine: Actual throttle position (DKI) - ABS/TCS control module X1-27.

6. Engine speed signal - ABS/TCS module terminal X1-30.

7. TCS disable switch (TRAC CTRL) - ABS/TCS module terminal X1-31.

8. GEN III V8 Engine: Serial data (input and output) - ABS/TCS control module terminal X1-11.

Outputs

To c ontrol the anti- lock brak ing system and tr action contr ol system , the ABS/TCS c ontrol modul e sends com mand

signals to the following components.

1. Valve relay/solenoid valves – internal control.

2. Pump relay/pump motor – internal control.

3. Serial data – ABS/TCS module terminal X1-11.

4. Self diagnostic 'Flash Code Actuation' – ABS/TCS module terminal X1-12.

5. V6 Engines: Torque requested – ABS/TCS module terminal X1-13.

GEN III V8 Engine: Requested throttle position – ABS/TCS control module terminal X1-13.

6. TCS warning lamp (TRAC OFF, LOW TRAC) – ABS/TCS module terminal X1-20.

7. ABS warning lamp – ABS/TCS module terminal X1-21.

8. GEN III V8 Engine: Requested spark retard – ABS/TCS control module terminal X1-28.

W ith the igniti on sw itch in the o n pos ition, bat ter y volt age is applie d to the ABS /TCS c ontr ol m odule t erm inal X1 -15

via fuse F27. Batter y voltage is also applied to the pum p motor relay and valve rela y via fusible link F103. Neither

of the relays operate until they receive an earth from the ABS/TCS control module.

Also, battery voltage is supplied to the ABS and TCS warning lamps via fuse F13. The LOW TRAC and ABS

warning lamps will n ot ill um inat e un ti l th e y are ear t hed b y AB S/T CS c ontr o l module. If the AB S/T CS c ontr o l module

wiring harn es s connec tor A 37, is not c on nec te d to the c ontrol module, t er minals 19, 20 an d 21 ar e s horte d to geth e r

by a shorting b ar , a nd the LOW TRAC and A BS warn in g l amps will be i lluminat ed. The T RAC O F F war ni ng la mp is

defaulted to the ON position and is turned off via a serial data message from the ABS/TCS control module when

the ignition is turned on (provided the system is OK).

Wheel speed sensors are located at each front wheel and at each final drive inner axle flange. When the vehicle

starts moving, all of the speed sensors create signals that are input to the ABS/TCS control module at terminals

X1-1 and X1-2, X1-4 and X1-5, X1-6 and X1-7, X1-8 and X1-9. These signals are AC electrical pulses that are

proportional (in frequency and amplitude) to wheel rotational speed.

Once the vehicle has been started and driven over approximately 6 km/h, the control module performs an

ABS/TCS self test. The control module test cycles each solenoid valve and the return pump in the hydraulic

modulator to check component operation. The control module checks its own logic section and circuitry. If errors

are detected during this test, the control module earths terminal 20, and illuminates the ABS warning lamp, while

the ABS/TCS control module sends a message, via the serial data circuit, commanding the TRAC OFF warning

lamp to be illuminated. The ABS and/or TCS warning lamp/s are illuminated to warn the driver of a problem with the

system/s. The ABS/TCS control module remains deactivated until the next ignition switch OFF to ON cycle when

the process is repeated and the ABS and/or TRAC warning lamp/s will be illuminated.

Figure 5B-48 – ABS/TCS – All Engines

The ABS self test occurs once each ignition cycle as follows:

1. After receiving an ignition ON input, the control module earths and activates the valve relay.

2. As soon as the ABS/TCS control module receives a signal from any of the wheel speed sensors, it checks

wheel speed sensor output. If any of the wheel speed sensor signals are not detected, or are incorrect, the

ABS/TCS system will be disabled and the warning lamps will be illuminated.

3. When the vehicle reaches approximately 6 km/h, the control module tests the solenoid valves and the return

pump in the modulator. This test can usually be heard and/or felt by the driver.

4. If the pump or solenoid va lves fail to operate, th e ABS/T CS system will be disabl ed and the war ning lam ps will

be illuminated.

Once the vehicle is moving (above 6 km/h), the control module continuously monitors itself and the following

components:

1. Solenoid valves.

2. Wheel speed sensors.

3. Wiring harness and relays.

4. Battery voltage.

If battery voltage drops below approximately 9 volts, the ABS/TCS will be disabled and the ABS and TRAC OFF

warning lamps will be illuminate d.

During braking applications, if one or more wheels start to decelerate too quickly, the ABS is engaged and the

modulation process begins. Wheel speed information sent to the ABS/TCS control module is processed and the

module determines proper solenoid valve operation in the modulator. The modulator contains ten solenoid valves;

one inlet and one outlet valve for each wheel.

When wheel spin is detected and traction control mode begins, the ABS/TCS control module also engages ABS

through the modulation process. Additionally, the ABS/TCS control module simultaneously changes the engine

torque conditions through the use of engine torque management.

HYDRAULIC MODULATOR OPERATION

The hydraulic modulator executes ABS control module commands using ten solenoid valves. These solenoid

valves, located in the hydraulic modulator assembly, are in series with the brake master cylinder and the brake

circuits. The hydraulic modulator solenoid valves are activated separately by the ABS/TCS control module

corresponding to various ABS or TCS control phases:

1. Non-ABS Braking (ABS and TCS phases)

2. Maintaining Pressure (ABS phase)

3. Reducing Pressure (ABS phase)

4. Increasing (Building-up) Pressure (ABS phase)

5. Normal condition (ABS and TCS phases – brakes off)

6. Applying (TCS phase)

The hydraulic modulator assembly contains ten solenoid valves and a brake fluid return pump; however, for

explanation of the operation only one accumulator and four solenoid valves will be described (rear brakes). The

operation is the same for all four circuits.

Non-ABS Braking (ABS and TCS phases)

Condition Description

During this normal brake application, brake apply

pressure (2) reaches maximum level (‘A’), causing

the wheel speed (1) to decelerate at the m aximum

optimum level.

Control Action

During normal brake application, the inlet and

outlet valves are not activated. The inlet valve

(pressure holding solenoid valve) is open. This

allows brake fluid to flow in either direction

between the brake master cylinder and the brake

caliper, providing for conventional non-ABS

braking. The outlet valve (pressure release outlet

solenoid valve) is closed, blocking off the passage

to the accumulator and the return pump.

The brake master cylinder hydraulic pressure is

applied to the brake circuits (caliper). If the

ABS/TCS control module (not shown) does not

detect any rapid wheel deceleration, the ABS will

remain passive at this time.

Figure 5B-49

Hydraulic modulator status:

LH inlet valve... Open LH outlet valve Closed

RH inlet valve.. Open RH outlet valve Closed

Priming valve... Closed Switching valve Open

Motor............... OFF

Figure 5B-50 – Rear Hydraulic System Only

Legend

A Pressurised Flow of Fluid

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Outlet Valve – Left

12. Outlet Valve – Right

13. Left Driven Wheel

14. Right Driven Wheel

Maintaining Pressure (ABS phase)

NOTE: The following diagram and explanation

assumes the right hand rear wheel is having a

tendenc y to lock .

Condition Description

When the ABS/TCS control module detects

excessive wheel deceleration (based on the wheel

speed sensor signal) indicating a wheel speed

deceleration (1) outside programming parameters,

it will com m and the h ydraulic modulat or to le vel out

the brake apply hydraulic pressure (2) and

maintain at that level (‘A’).

Control Action

it commands the right hand inlet valve (pressure

holding solenoid valve) to maintain brake circuit

pressure. It does this by earthing the respective

circuit (RH in this case), therefore allowing a

current flow through the coil of inlet valve. This

causes the ar m ature and val ve to move do wnwar d,

isolating the brake circuit (caliper) from the master

cylinder.

Figure 5B-51

NOTE: W ith the brake circuit iso lated, brake c ircuit

pressure between the modulator and the brake

caliper circuit remains constant despite increased

master cylinder hydraulic pressure.

Hydraulic modulator status:

LH inlet valve... Open LH outlet valve. Closed

RH inlet valve.. Closed RH outlet valve Closed

Priming valve... Closed Switching valve Open

Motor............... OFF

Figure 5B-52 – Rear Hydraulic System Only

Legend

A Pressurised Flow of Fluid

B Pressure Hold (ABS Mode)

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Outlet Valve – Left

12. Outlet Valve – Right

13. Left Driven Wheel

14. Right Driven Wheel

Reducing Pressure (ABS phase)

NOTE: The following diagram and explanation

assumes the right hand rear wheel is having a

tendenc y to lock .

Condition Description

If isolation of a brake circuit between the brake

master cylinder and the brake caliper does not

reduce the excessive wheel deceleration (1), the

ABS/TCS control module commands the hydraulic

modulator to reduce the brake apply pressure (2)

to a reduced level (‘A’).

Control Action

From an ABS/TCS control module command, the

modulator reduces hydraulic brake pressure in the

brake circuit (RH outlet valve in this case), by

openin g the ou tlet v alve (pr ess ure rele ase s oleno id

valve). During this phase, the ABS/TCS control

module earth’s the coil of the RH outlet valve,

allowing a current flow through the coil windings.

This causes the armature and valve to move

downward, opening a passage from the brake

circuit to the accumulator and the pump assembly

inlet.

Figure 5B-53

At this stage, both the RH inlet and RH outlet

valves are activated simultaneously.

Because the brake pedal is still being depressed

during this phase, the released pressure from the

caliper has to be greater than that of the pressure

of the normal (non-ABS) brake circuit. To do this,

the pump motor is energised and the pump

becomes operational. This will increase the return

flow pressure from the caliper, thus allowing the

fluid released from the caliper to be returned back

to the master cylinder. The pump will continue to

operate during the rest of the anti-lock brake cycle.

Hydraulic modulator status:

LH inlet valve... Open LH outlet valve.Closed

RH inlet valve..Closed RH outlet valve Open

Priming valve... Closed Switching valve Open

Motor............... ON

NOTE: Motor will remain operational until ABS

mode is exited.

Accumulators

During the 'Reducing Pressure' reduction phase of

ABS m odulat ion, th e accu m ulators (2c) tempor arily

store fluid from the brake circuits. Some road

conditions require the relief of a large volume of

fluid fr om the brak e caliper. In suc h conditio ns, the

accumulator guarantees pressure reduction. As

soon as the solenoid valve (2b) moves to the

'Reduction Pressure' position, brake fluid from the

brake circuit flows into the accumulator. Thus,

before the return pump (2d) starts operation, the

accumulator allows an immediate pressure

reduction in the brake circuit. The front brake

circuits share a common accumulator. The rear

brake circuit uses a separate accumulator. The

accumulators are spring-loaded and designed to

operate at less than 1,00 0 kPa.

Figure 5B-54 – Rear Hydraulic System Only

Legend

A Pressurised Flow of Fluid

B Pressure Hold (ABS Mode)

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Outlet Valve – Left

12. Outlet Valve – Right

13. Left Driven Wheel

14. Right Driven Wheel

Increasing (Building-up) Pressure (ABS Phase)

NOTE: The following diagram and explanation

assumes the right hand rear wheel is having a

tendenc y to lock .

Condition Description

The wheel begins to accelerate again (1), as a

result of the reduced braking pressure (2). Upon

reaching a specific limit, the ABS control module

registers the fact that the wheel is now not being

braked sufficiently and commands the hydraulic

modulator to increase the brake apply pressure

(‘A’).

Control Action

The ABS control module then de-energises both

the RH inlet and RH outlet valves and the formerly

reduced pressure is then increased so that the

wheel is again decelerated. The ABS control cycle

begins again. There is approximately 4 – 6 control

cycles per second, depending on the state of the

road surface.

Figure 5B-55

Hydraulic modulator status:

LH inlet valve... Open LH outlet valve ... Closed

RH inlet valve.. Open RH outlet valve... Closed

Priming valve... Closed Switching valve .. Open

Motor............... ON

Figure 5B-56– Rear Hydraulic System Only

Legend

A Pressurised Flow of Fluid

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Outlet Valve – Left

12. Outlet Valve – Right

13. Left Driven Wheel

14. Right Driven Wheel

TCS Normal Condition (ABS and TCS Phases)

In the n ormal condit ion, ther e is no brak e interventio n. All t he valves in the hydr aulic m odulator are in t heir nor mal

rest positions, allowing for uninterrupted flow for a normal braking condition. The schematic below depicts no

pressure in the system, therefore no application of brakes.

Hydraulic modulator status:

LH inlet valve... Open LH outlet valve. Closed

RH inlet valve.. Open RH outlet valve Closed

Priming valve... Closed Switching valve Open

Motor............... OFF

Figure 5B-57 – Rear Hydraulic System Only

Legend

A Pressurised Flow of Fluid

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Outlet Valve – Left

12. Outlet Valve – Right

13. Left Driven Wheel

14. Right Driven Wheel

TCS in Operation (TCS Phase)

NOTE: The following diagram and explanation assumes the right hand rear wheel is having a tendency to spin.

Brake Intervention

In the next schematic, the right hand wheel speed sensor has detected that the wheel is about to enter into a

situation where wheel slippage is about to occur from excess engine torque for the road condition.

The ABS/TCS control module commands the priming valve open, allowing fluid to be drawn from the master

cylinder b y the pum p as sem bly. The switc hing va lve is closed, ens uring f luid is d irected to th e whe els an d not bac k

to the master cylinder.

With the right wheel tending to spin, the left inlet valve closes, allowing the brakes to be applied only to the right

wheel. This will transfer the torque to the left wheel. This operation can be applied approximately 4 – 6 times a

second and can function on either of the driven wheels, or both.

Hydraulic modulator status:

LH inlet valve... Closed LH outlet valve... Closed

RH inlet valve.. Open RH outlet valve .. Closed

Priming valve... Open Switching valve.. Closed

Motor............... ON

Figure 5B-58 – Rear Hydraulic System Only

Legend for Figure 5B-52

A Fluid Being Drawn From the Master Cylinder

B Pressurised Flow of Fluid

1. ABS/TCS Hydraulic Module

2. Brake Master Cylinder

3. Switching Valve

4. Priming Valve

5. Pump Assembly

6. Damper

7. Motor

8. Inlet Valve – Right

9. Inlet Valve – Left

10. Accumulator

11. Out l et Val ve – Left

12. Out l et V al ve – Right

13. Left Driven Wheel

14. Right Driven Wheel

Engine Torque Management – V6 Engines Only

At the same time the ABS/TCS control module initiates brake intervention, it also communicates with the

Powertrain Control Module (PCM), requesting the PCM to bring the engine torque into a specific range.

With the ignition on and the engine not running, the ABS/TCS control module constantly sends a Pulse Width

Modulat ed (PW M) signal with a duty cyc le of 93% to t he PCM. T he PCM respon ds with a PW M signal with a dut y

cycle of 5%. When the engine is started, the duty cycle of the torque acknowledgment signal will increase to

approximately 30% at idle. When the ABS/TCS control module determines that a reduction in engine torque is

required, the torque requested signal will decrease from 93% (no torque reduction) to 30% (maximum torque

reductio n) the PCM will the n reduce the engin e torque to the req uired am ount by adjusting s park firing and a ir/fuel

ratio, alt ering boost dut y cycle (Superc harged V6 e ngine only) and sh utting OFF up to f ive injector s (if necess ary).

During trac tion control, the duty cycle of the torque ack nowledgm ent signal s hould be sim ilar to and follo w the duty

cycle of the torque requested signal.

Engine Spark and Throttle Position Intervention – GEN III V8 Engine Only

At the same time the ABS/TCS control module initiates brake intervention, it also communicates with the

Powertrain Control Module (PCM) and the throttle relaxer control module requesting the PCM to retard the spark

advance and for the throttle relaxer control module to reduce the throttle opening.

With the engine running, the PCM continually supplies and monitors a 12 volt pull-up voltage to the spark retard

circuit. T he ABS/T CS co ntrol m odule re quests sp ark retard by p ulling this voltage low. T he PCM th en res ponds b y

reducing the spark advance of the engine.

The AB S/TC S contr ol m odule constan tl y sends a Pu lse Width Modulated (PWM) signal a t 90% with a fr equenc y of

100Hz to th e throttle rel ax e r c ontr ol module on th e req ues ted throttle pos it io n li ne ( DKR) T his s ignal is to i ndi c ate to

the throttle relaxer control module that the traction control system (TCS) is in a state of readiness.

With the engine running, the ABS/TCS control module constantly sends a Pulse Width Modulated (PWM) signal

with a duty cycle of 90% to the throttle relaxer control module via the requested throttle position line (DKR). The

throttle relaxer control module responds on the actual throttle position line (DKI) with a PWM signal with a duty

cycle of 9%.

When the ABS/TCS control module determines that a reduction in throttle is required, it reduces the PWM signal on

the requested throttle position line (DKR), from 90% (no throttle reduction) to as low as approximately 14%

(maximum throttle reduction). The throttle relaxer control module then drives the throttle relaxer motor, overriding

the accelerator pedal command (drivers foot), pulling the throttle cable back, and thus, closing the amount of

throttle opening.

MASTER CYLINDER OPERATION

The operation of the master cylinder assembly used on vehicles with ABS is the same as the assembly used on

vehicles wit hout ABS, refer to Section 5A SERVICE AND PARK BR AKING SY STEM in the MY 2003 VY and V2

Series Service Information for details.

OPERA TION AND TESTING OF THE ABS AND ‘TRAC OFF’ WARNING LAMPS

Should a vehicle equipped with ABS/TCS come into the workshop with one of the following customer complaints,

make sure of the circumstances before checking the complete ABS/TCS with the Tech 2 diagnostic scan tool.

1. Warning lamp(s) does not illuminate after switching the ignition on.

2. Warning lamp(s) does not go out after engine has started.

3. Warning lamp(s) illuminates again while driving or illuminates occasionally.

The following information describes the functioning and malfunctioning of the ‘ABS’ and ‘TRAC OFF’ warning

lamps.

‘ABS’ and ‘TRAC OFF’ Warning Displays

When the ignition is switched on, the ‘ABS’ warning display is activated for approximately two seconds and the

‘TRAC O FF ’ warn in g l amp for appr oximately fiv e s econds ( with eng ine r unn in g, ‘TRAC OF F ’ dis p lay is activat ed for

only two s econds als o). During t his per iod of tim e, the AB S/TCS contr ol m odule per forms a c heck of the ABS/TCS

system wiring.

On all vehicles with ABS/TCS, as soon as all four wheels of the vehicle exceed a speed of approximately 6 km/h for

the first time after starting, the ABS/TCS system tests itself automatically (ABS/TCS 'Self-Test'). The ABS/TCS

control module cycles each solenoid valve and the return pump motor in the hydraulic modulator to check

component operation. The ABS/TCS control module also checks its own circuitry.

Figure 5B-59

This procedure is repeated every time the ignition is switched off and the engine is started again.

In addition, the ABS/TCS system constantly tests itself while the vehicle is travelling. The warning display is also

used for self diagnosis purposes.

NOTE: The ‘TRAC OFF’ warning display will also be activated if the ‘T/C’ button has been pressed. The ‘TRAC

OFF’ light will then stay activated until either the ignition is switched off or the ‘T/C’ button is pressed again.

Incorrect Warning Lamp Indications (‘ABS’ and ‘TRAC

OFF’)

1. Warning display(s) is not activated after switching ignition ON.

2. Warning display(s) is not de-activated after approximately 2 seconds.

3. Warning display(s) is activated when driving or is activated occasionally.

NOTE: The ‘T RAC OFF’ warnin g displa y will be acti vated if the s ystem is manually s witched of f b y the ‘T /C’ s witch

located in t he console and the ‘LOW TRAC’ warning display will flash if the TCS system is functioning (in a whee l

spin situation). If either of these displays are activated under these conditions, the system is functioning correctly.

Activat ion of the ABS warni ng lamp indica tes to the dri ver that the AB S is defecti v e.

Activation of the ‘TRAC OFF’ warning display indicates to the driver that the TCS system is either manually

disabled or defective.

When the ABS warning lamp is activated, the vehicle reverts to normal braking as in vehicles without ABS fitted

(e.g. under emergency braking, wheel/s may lock).

When the ‘TRAC OFF’ warning display is activated, the ABS still functions correctly.

Occasional activation of the warning lamps may be brought about through the battery being insufficiently charged.

The display is only activated as long as there is a low voltage, e.g. after switching on electrical components at idle.

The causes of any malfunction can be determined with the assistance of the Tech 2 diagnostic scan tool.

‘LOW TRAC’ Warning Display

The ‘LOW TRAC’ display in the Multi-Function

Display (MFD) (1), is used to inform the driver that

the vehicle is in a critical driving situation and that

the TCS system has been engaged to control

wheel spin.

Figure 5B-60

3. SERVICE OPERATIONS

3.1 SAFETY AND PRECAUTIONARY MEASURES

The f ollowing infor m ation is gener al saf ety and prec aut ionar y meas ures tha t m ust be o bser ved when ser vicin g and

diagnosing the ABS or ABS/TCS system.

BEFORE TESTING FOR AN ABS OR ABS/TCS FAULT, ENSURE THAT CONVENTIONAL BRAKES ARE

WORKING CORRECTLY.

ABS and ABS/TCS are basically maintenance-free, however, when working on a vehicle with either of these

systems, the following points must be observed:

1. Whenever welding with electric welding equipment, disconnect wiring harness plug from the ABS or ABS/TCS

control module.

2. W henever painting a vehicl e using dr yin g techniques t hat put the tem perature ab ove +85°C f or mor e than one

hour, remove the ABS or ABS/TCS control module from the vehicle.

3. During any service operation that requires the replacement of the hydraulic modulator, the ABS or ABS/TCS

control module, wheel speed sensors, wiring harness, as well as after work procedures in which contact is

made with the various A BS and TCS assemblies (eg. accident repair), the com plete ABS or ABS/TCS system

MUST be checked, refer to 4.4, ABS, ABS/TCS FUNCTION AL CHECK in this Section.

Make sure that the brake lines, wheel speed sensor connections on the ABS control module, and the wheel

speed se ns or wiring harness c onnec tions ar e ass igne d c orr ec tl y (ref er to AB S an d AB S/TCS wiring di agr am, in

Section 12P WIRING DIAGRAMS in this Service Inform ation.

4. After any work is carried out on the brake system, the brake system must be bled and a high-pressure test

conducted. All junctions must be tested for leakage.

5. Be sure to properly tighten the battery cable terminals on the terminal posts of the battery.

6. Do not use a fast charger for starting the vehicle.

7. Never disconnect the battery from the vehicle electrical system while the engine is running.

8. Disconnect the battery from the vehicle electrical system before charging.

9. Make sure that all connectors of the wiring harness are seated correctly.

10. Never disconnect or connect the ABS or ABS/TCS control module wiring harness connector when the battery is

connecte d or the igniti on is turned on.

11. Always use suitable wiring harness test leads (such as those in KM-609) when carrying out any test on the

ABS or ABS/TCS control module wiring harness connector to avoid terminal damage.

12. Always caref ully note th e routing, pos iti on, mount ing a nd loc at ion of A BS or A BS/T CS wir in g, co nnec t or s , cli ps ,

brackets. As ABS and ABS/TCS components are extremely sensitive to EMI (Electro-Magnetic Interference).

Proper mounting is critical when servicing ABS or ABS/TCS components.

13. Do not hang the suspension components by the wheel speed sensor cables; these cables are delicate.

14. Some components of the ABS or ABS/TCS are not serviced separately and must be replaced as assemblies.

15. F or saf ety reaso ns, th e h ydraulic m odul ator and / or c ontro l m odule m ust never be repa ired. Rep air of eith er of

these two units is b y rep lacement only. Apart from the brak e line connections a nd the six screws securing the

control module to the hydraulic modulator, no screws at the hydraulic modulator may be loosened. Once they

are loosened, it is impossible to make the brake circuits leak-free ever again!

16. Special wiring repair procedures have been developed for use on the ABS and ABS/TCS due to

the sensitive nature of the circuitry. These specific procedures and instructions are detailed in

Section 12P WIRING DIAGRAMS in this Service Information. THE PROCEDURES DETAILED IN THIS

INFORMATION ARE THE ONLY RECOMMENDED AND APPROVED ABS OR ABS/TCS WIRING REPAIR

METHODS.

DANGER OF FATAL ACCIDENT

Caution when handling brake fluid

A. Even the slightest trace of mineral oil leads to failure of the brake system. Special care must be taken with

colourless or yellow-tinted brake fluid, since the danger of a mix-up is greatest with such fluid. If mineral oil is

found in the brake system or there is a suspic ion of mineral oil being in the brake system, the complete brake

system must be thoroughly flushed out with the correct type of brake fluid (only use fluid to Super Dot 4 Plus

specification). In addition to this, the master cylinder must be replaced.

B. Do not allow brake fluid to come in contact with paintwork of the vehicle, since the fluid attacks the paint.

C. Brake f luid is ex c eedingly hygros copic; ie. a bs or bs moisture from the air , thus r ed uc ing i ts boi li ng po int . For this

reason, brake fluid must be stored only in well-sealed storage containers.

NOTE: As the operation time progresses, the boiling point of the brake fluid drops owing to the brake fluid

permanently absorbing m oisture from the atmosphere. If the brakes are subjected to very severe loading, this can

lead to vapour-bubble formation in the brake system.

Therefore, the brake fluid must be replaced at the time or distance intervals as specified in Section 0B

LUBRICATION AND SERVICE in the MY 2003 VY and V2 Series Service Information.

IMPORTANT: ABS AND ABS/TCS ARE VEHICLE SAFETY SYSTEMS. WORK ON THESE SYSTEMS

PRESUPPOSES DETAILED SYSTEM KNOWLEDGE.

The above precautions are not exhaustive and are to be followed when working on an ABS or ABS/TCS

equipped vehicle. Become familiar with the ABS or ABS/TCS and how it may be interrelated to other

components on the vehicle when performing service work.

3.2 BRAKE SYSTEM BLEED

General brake bleeding for the ABS and ABS/TCS systems are the same as for the standard braking system. Refer

2.4 Brak e System Bleed, i n Section 5 A SERVI CE AND P ARK BRAKING SY STEMS, in th e MY 2003 VY and V2

Series Service Information.

However, when bleeding operations involve the ABS Hydraulic Control Module, specific procedures must be

followed, that require the use of Tech 2. Refer F4: Miscellaneous Tests, in 4.8 TECH 2 TEST MODES AND

SCREEN DISPLAYS FOR ABS AND TCS DIAGNOSIS, in this Section.

Techline

3.3 FRONT WHEEL SPEED SENSOR LEAD

LT Section No. – 04-730

REMOVE

1. Raise front of vehicle and support on safety

stands. Observe jacking precautions as

outlined in Section 3 FRONT SUSPENSION

in the MY 2003 VY and V2 Series Service

Information.

2. Remove appropriate wheel cover (steel

wheels) or wheel nut decorative caps (alloy

wheels).

3. Mark relationship of wheel to hub or brake

disc. Remove wheel attaching nuts and

remove wheel.

4. From engine compartment, pull appropriate

sensor connector (3) from retaining clip (2) at

fender inner panel.

Legend:

1. Sensor Lead

2. Retaining Clip

3. Connector

4. Main Wiring Harness

Figure 5B-61

5. From the engine compartment, disconnect the

sensor harness connector (2) from main wiring

harness connector by levering out with a small

screwdriver.

6. Check that the O-ring (2) is undamaged.

Figure 5B-62

7. Pull the sensor lead (2) an d fender in ner panel

grommet (1) in the inner wheelhouse.

8. Disconnect sensor lead (2) from the front strut

mounting (3), taking note of lead routing.

Figure 5B-63

9. From behind steering knuckle, lift the wheel

speed sensor lead connector retaining tang,

then gentl y pull on the co nnector (1) to rem ove

from the wheel speed sensor (2).

10. Remove the sensor lead from the vehicle.

Figure 5B-64

TEST

Probe the two Ohmmeter (2) leads into the two

terminals of connector B52 (front wheel speed

sensor) or B76 (rear wheel speed sensor) (1) and

check for continuity. W ith the lead disconnected at

both ends, there should be no continuity between

the terminals (open circuit).

NOTE: Ensure that your skin is not contacting the

terminals of the sensor lead or multimeter leads

while checking res istanc e b et ween the ter minals as

your skin will serve as a conductor.

A good sensor lead will have a resistance value of

infinity (open circuit indication), between the

terminals. If you measure a resistance value other

than infinity, replace the lea d ass embly.

Figure 5B-65

REINST ALL

Installation of the front wheel sensor lead is the

reverse of removal procedures, noting the following

points:

1. Refit wheel speed sensor lead connector to

sensor and steering knuckle. Push connector

into the sensor until the retaining clip snaps

into place.

2. Install sensor lead into inner wheelhouse and

front strut mountings, taking care that lead

routing is correct and not crossed up with

brake caliper hydraulic hose. For lead routing,

refer to Figure 5B-34 in this Section.

3. Install the road wheel, aligning marks made

prior to rem oval, ins ta ll attaching nuts .

4. Remove jack stands and lower vehicle.

5. Progressively tighten the wheel attaching nuts

in a ‘star’ pattern as shown, to the correct

torque specification.

ROAD WHEEL ATTACHING NUT

TORQUE SPECIFICATION 110 – 140 Nm

6. Reinstall wheel centre cap or wheel nut

decorative caps.

7. Check ABS operation, refer to

4.4 FUNCTIONAL CHECK in this Section.

Figure 5B–66

3.4 WHEEL SPEED SENSORS

LT Section No. – 04-730

FRONT WHEEL SPEED SENSOR

NOTE: The front wheel speed sensors are incorporated as part of the front suspension front wheel hub assembly.

Apart from wheel stud replacement, there are no serviceable items in the front wheel hub assembly.

With the unit being a 'sealed for life' assembly, there are no requirements for wheel speed sensor and/or bearing

adjustments. Should a non-standard condition develop, then the hub assembly must be replaced as a complete

unit.

There are three specific front wheel hub

assemblies available. For vehicles with ABS or

ABS/TCS, there is a right and left, which

incorporates the wheel speed sensor and a 48

tooth magnet impulse ring. For non ABS vehicles, a

common hub is used for both sides.

Identification of the front wheel hub assemblies is

by the assembly part number etched on the outer

surface (1) of the hub wheel flange or by simply

noting whether a wheel speed sensor cap is fitted

to the hub (2).

CAUTION: During any service operation that

requires the replacement of the front hub

assembly on a vehicle equipped with ABS/TCS,

ensure that the correct replacement hub

assembly is installed, otherwise malfunctioning

of the ABS or ABS/TCS will occur.

NOTE 1: Always refer to the latest spare parts

information (PartFinder®) for the correct front

wheel hub assembly part numbers.

NOTE 2: Apart f rom wheel stud r eplacem ent, there

are no serviceable items in the front wheel hub

assembly. With the unit being a ‘sealed for life’

assembly, there are no requirements for wheel

speed sensor and/or bearing adjustments. Should

a non-standard condition develop, then the hub

assembly must be replaced as complete unit.

T212L004

Figure 5B–67

For front wheel hub checking procedures, other than wheel speed sensor checking, refer to

Section 3 FRONT SUSPENSION in the M Y 2003 VY and V2 Seri es Serv ic e Infor mation.

For front wheel hub removal and reinstallation procedures, refer to Section 3 FRONT SUSPENSION in the MY

2003 VY and V2 S eries Service Inf ormation. T he procedure detaile d there, relates to both AB S and non ABS f ront

hubs.

REAR WHEEL SPEED SE NSOR

Remove

1. Raise the rear of the vehicle and support,

using safety stands under trailing

arms to support weight of vehicle. Refer to

Section 0A GENERAL INFORMATION in the

MY 2003 VY and V2 Series Service

Information for location of jacking points.

2. Pull appropriate sensor lead connector from

underbody retaining clip. Separate sensor

connector from body harness connector by

leveri ng out with a scr e wdriver .

3. Remove sensor attaching screw from the final

drive rear cover outrigger bracket, then gently

pull on the s ensor (1) with a twisting m otion, to

remove.

T212L008

Figure 5B-68

Reinstall

1. Before reinstalling sensor, check sensor for any signs of damage.

IMPORTANT: A replacement wheel sensor must only be taken out its packaging immediately before installing on

the vehicle.

2. Clean all traces of foreign matter from sensor and mounting bracket mating hole.

3. Reinstall sensor into mounting bracket and tighten attaching screw to the correct torque specification.

WHEEL SPEED SENSOR

ATTACHING SCREW

TORQUE SPECIFICATION 6 – 14 Nm

4. Connect sensor lead connector to body harness connector and secure to underbody retaining clip.

3.5 PULSE RINGS

LT Section No. – 05-290

NOTE: The rear whee l pulse rings are part of the final drive inner axle flanges and ar e a press fit onto each of the

rear axle s hafts . Ther efor e, the followin g servic e opera tion des cribes the re placement pr ocedures for the pulse rin g

and inner axle shaft assembly.

REMOVE

1. Using a f loor jac k under centr e of dif fer ential c arrier, j ack up rear of ve hicl e and th en place s afet y stands und er

body rear jacking points. Refer to Section 0A GENERAL INFORMATION in this Service Information for

location of jacking points.

2. Remove drive shaft from side of vehicle which inner axle shaft is to be removed, refer to 2.7 Drive Shaft

Assembly – Remove, in Section 4B FINAL DRIVE AND DRIVE SHAFTS in the MY 2003 VY and V2 Series

Service Information.

NOTE: During drive shaft removal, keep drive shaft supported so that it does not hang on one end, as drive shaft

deflection must be kept to a minimum.

3. Remove wheel speed sensor from the side

being worked on. Refer Rear Wheel Speed

Sensor, in 3.4 WHEEL SPEED SENSORS in

this Section.

4. Remove inner axle shaft (1) by installing a slide

hammer, T ool No. 7 374 wit h thr ee su it abl e si ze

bolts to axle flange. Use slide hammer to

release axle shaft spring clip.

As the axle shaft is removed, a small amount

of lubricant may leak from differential carrier.

IMPORTANT: If a 3.08:1 ratio final drive is fitted

with LSD, do not rotate the opposite axle shaft,

as side gear and clutch cone splines will

become misaligned. Then the axle shaft cannot

be reinstalled without removing differential

case, dismant ling and realigning g ear and con e

splines.

NOTE: The above ‘Important’ note does not apply

to either the 3.07:1 or 3.46:1 ratio final drives,

because the side gear and LSD cone is an

integrated component.

5. Clean around seal bore and housing area to

make sure that no foreign matter enters axle

shaft needle bearing in the sc r ew adjuster .

Figure 5B-69

REINST ALL

NOTE 1: The left hand in n er axle s h af t is s horter i n

length than the right hand shaft.

NOTE 2: Check spring clip in end of axle shaft to

ensure that it is not damaged and moves freely in

groove. Replace spring clip if necessary, by

expanding ends of clip and removing from shaft.

Only expand the ends of a new clip sufficiently to

allow installation into shaft groove.

1. Lubricate inner axle shaft seal lips with lithium

soap grease.

2. Reinstall inner axle shaft (1), aligning splines

with clutch cone (if fitted with a 3.08:1 Limited

Slip Differential) and side gear.

NOTE: To avoid premature seal failure, ensure

axle shaft splines or securing clip do not score or

damage the seal lips during installation.

3. Lig htly hit on e nd of axle shaft f lange (1) wit h a

soft faced hammer (2) to compress spring clip

on shaft in to cl utch con e and s ide g ear spl ines.

Fully engage shaft (1) until clip sna ps into side

gear groove.

4. Reinstall drive shaft, refer to 2.7 Drive Shaft

Assembly in Section 4B FINAL DRIVE AND

DRIVE SH AFTS in MY 200 3 VY and V2 S eries

Service Information.

5. Reinst all wheel s peed sens or to the s ide being

worked on. Refer Rear Wheel Speed Sensor,

in 3.8 WHEEL SPEED SENSORS in this

Section.

6. Remove safety stands and lower vehicle.

7. Check and fil l dif fer ential c arr ier to c orrec t le vel

with specified lubricant. Refer to 2.2 Check ing

Differential Carrier Lubricant Level in

Section 4B FINAL DRIVE AND DRIVE

SHAFTS in the MY 2003 VY and V2 Series

Service Information.

8. After carrying out repairs, check ABS

operation, refer to 4.4 FUNCTIONAL CHECK

in this Section.

Figure 5B-70

3.6 HYDRAULIC MODULATOR AND CONTROL MODULE ASSEMBLY

LT Section No. – 04-730

NOTE: 1. For safety reasons, the hydraulic modulator and / or control module must never be repaired. Repair of

either of these two units is by replacem ent onl y. Apart fr om the brake line c onnections an d the six sc rews securing

the control module to the hydraulic modulator, no screws at the hydraulic modulator m ay be loosened. Once they

are loosened, it is impossible to make the brake circuits leak-free ever again!

Replacem ent hydraulic m odulator assem blies are supplied pre-filled with brak e fluid. Do not rem ove sealing plugs

from modulator ports until ready to install brake line connections.

NOTE: 2. Once replacement modulator has been fitted, the sealing plugs must be fitted to original modulator to

prevent dirt and moisture entry.

REMOVE

1. Disc onnec t batt er y earth le ad.

2. Pull out the release bar (1) on the control

module wiring harness connector

(approximately 32.4 mm) and remove wiring

harness connector from control module, as

shown.

NOTE: The wiring harness connector will

automatically lift at the same time the release bar is

withdrawn.

3. Fold back wiring harness connector and wiring

away from the hydraulic modulator and control

module assembly.

Figure 5B-71

4. Place protective covers over vehicle exterior

panels to prevent paint damage from any

possible brake fluid spillage.

5. To aid in reassembly, tag all brake lines at

modulator. When tagging brake lines, make

sure the lines are marked in accordance with

the markings on the hydraulic modulator ports.

WARNING: If brake lines are incorrectly fitted

on reassembly, wheel lock-up will occur and

personal injury may result.

Markings on modulator, refer to Fig. 5B-66 are:

LF = Connection for brake line, front left.

LR = Connection for brake line, rear left and

right (ABS) or rear left only (ABS/TCS).

F = Front brake circuit from master cylinder.

R = Rear brake circuit from master cylinder.

RF = Connection for brake line, front right.

RR = Connection for brake line, rear right

(vehicles with T CS only).

6. Place shop rags around and beneath

modulator, then loosen and disconnect brake

lines from modulator.

Figure 5B-72

Techline

IMPORTANT: Imm ediately seal of f brake lines and

connections with dummy plugs to prevent the loss

of brake fluid and the ingress if foreign matter. If

necessary, gently push brake lines away from

modulator assembl y ports, tak ing extreme c are not

to damage or kink the brake lines in any way.

7. Loosen or remove the two nuts (1) securing the

hydraulic modulator and control module

assembly (2) to the mounting bracket (3).

8. Lift hydraulic modulator and control module

assembly (2) up and out of mounting bracket

(3).

Figure 5B-73

REINST ALL

Reinstallation of the hydraulic modulator and

control module assembly is the reverse of removal

procedures noting the following points:

1. Before installing hydraulic modulator and

control module assembly, clean any traces of

brake fluid from within mounting bracket.

2. If necessary, transfer bumpers to mounting

studs on replacement hydraulic modulator and

control module assembly.

3. Ensure the hydraulic modulator motor wiring

harness connector (1) is connected to the

control module, refer to Figure 5B-68.

4. Reinstall hydraulic modulator and control

module into mounting bracket and tighten

securing nuts to the correct torque

specification.

Figure 5B-74

HYDRAULIC MODULATOR

AND CONTROL MODULE

SECURING NUT

TORQUE SPECIFICATION 5.0 – 12.0 Nm

5. Rem ove plugs from hydraulic modulator ports and reinstall brake lines, using tags fitted on removal to ensure

correct fitment of each pipe to the correct port on the modulator.

CAUTION: M ake sure the brake l ines a re co rre ctl y connected to the modulator. If brake l ines are inco r rectl y

fitted, wheel lock-up will occur and personal injury may result. The only ways that this condition can be

detected are by using Tech 2 or by performing an ABS stop.

6. Tighten brake line connections to the correct torque specification.

BRAKE LINE CONNECTION

TORQUE SPECIFICATION 8 – 11 Nm

NOTE: If a r eplacem ent hydraulic m odulator a nd con trol m odule ha s been f itted, t he sea ling p lugs m ust be fitted t o

the original unit to prevent dirt and moisture entry.

7. Bleed brake system at the hydraulic control module, all brake calipers and test for leaks, refer to

3.2 BRAKE SYSTEM BLEED, in this Section.

NOTE: Use brake fluid to Super DOT 4 Plus specification only.

8. After carrying all out repairs, check ABS or ABS/TCS operation, refer to 4.4 FUNCTIONAL CHECK in this

Section.

3.7 CONTROL MODULE

LT Section No. – 04-730

NOTE: Remove the new control module from it’s protective package only when it is ready to be fitted to the

hydraulic modulator.

REMOVE

1. Disc onnect batter y ground l ead.

2. Remove hydraulic modulator and

control module assembly, refer to

3.6 HYDRAULIC MODULATOR AND

CONTROL MODULE ASSEMBLY in this

Section.

NOTE 1: While it is possible to replace the control

module assembly without first removing the

hydraulic modulator, for ease of fitment and to

ensure the correct installation of the replacement

control module, it is s tr o ngly r ecomm ended that the

complete assembly be removed from the vehicle,

prior to disassembly.

NOTE 2: Ensure blanking plugs are fitted to the

pipe connections of the hydraulic modulator to

avoid excess drainage and contamination of the

brake fluid.

3. Disconnect hydraulic modulator motor wiring

harness connector (1) from the control module

(2) and press the motor wiring out of the

retainer on the control module (3), refer to

Figure 5B-6 9.

Figure 5B-75

4. Support the hydraulic modulator and control

module assem bly so that the control m odule is

facing upwards, in a horizontal position, as

shown.

5. Using a T-20H Torx bit, remove the 6 Torx

screws (1) securing the control module (2) to

the hydraulic modulator (3). Lift the control

module (2) upwards and remove from the

hydraulic modulator (3).

6. Cover the valve body of the hydraulic

modulator to protect it from damage and

prevent any foreign matter from entering the

unit.

Figure 5B-76

INSPECT

Inspect the sealing su rf ac e of the h ydraul ic m odula tor f or c lean lin es s or damage. If the s ealin g s urf ac e is damaged ,

the surf ace cannot be m echanical ly rework ed and therefor e, the complete hydraulic m odulator and c ontrol m odule

assembly must be replaced.

NOTE: The use of chemical solvents is not permitted for cleaning.

REINSTALL

1. Before installing a new control module, ensure

that the correct type is fitted (e.g. ‘A’ is for an

ABS unit, while ‘B’ is for the ABS/TCS

module). Always refer to the latest spare parts

information (PartFinder®) for the correct ABS

or ABS/TCS control module part numbers.

2. Position the hydraulic modulator assembly (2)

so that the control module face is facing

upwards.

3. Remove the new control module (1) from the

protective packaging and, using the new

screws supplied, place screws in the new

control module and set the control module into

position.

Figure 5B-77

4. Tighten the six Torx screws securing the

control module to the hydraulic modulator in

the sequence shown in Figure to 5B-72 and to

the recommended torque specification.

CONTROL MODULE TO HYDRAULIC

MODULATOR TORX SCREW

TORQUE SPECIFICATION 3 Nm

5. Visually inspect the hydraulic modulator and

control m odule assembly to ensure there is no

gap between control module and the hydraulic

modulator and to ensure Torx screws are

contacting control module correctly.

6. Connect the hydraulic modulator motor wiring

harness connector to the control module and

press the motor wiring into the retainer on the

control module.

7. Reinstall the hydraulic modulator and control

module assembly, refer to 3.6 HYDRAULIC

MODULATOR AND CONTROL MODULE

ASSEMBLY in this Section.

8. Reconnect battery earth lead.

9. After carrying out all repairs, check ABS

or ABS/TCS operation, refer to

4.4 FUNCTIONAL CHECK in this Section.

Figure 5B-78

3.8 MASTER CYLINDER

REMO VE AND R EINST ALL

Remo val a nd installat ion in s tr uc tions f or the mast er cylinder on A BS eq ui ppe d vehicles is the s ame as f or non -AB S

vehicles an d is as des cribe d in 3 .1 Mas ter Cylinder , i n Se ction 5 A SERVIC E AND P ARK BR AKING SY ST EM S in

the MY 2003 VY and V2 Series Service Information.

NOTE: If installing a new master cylinder assembly to an ABS or ABS/TCS equipped vehicle, ensure that the screw

in blanking plug is installed and tightened into the lower of the two front brake outlets in the master cylinder.

OVERHAUL

Master cylinder overhaul instructions are the same as described in 3.1 Master Cylinder, in

Section 5A SERVICE AND PARK BRAKING SYSTEMS in the MY 2003 VY and V2 Series Service Information.

3.9 TRACTION CONTROL SWITCH (T/C)

REMOVE

Automatic Transmission Vehicles

1. If the selector control lever is of the BTSI

design, manually release the shift lever from

the Park position. refer to Step 1 of

3.3 Selector Control Lever Assembly,

Disassemble, in Section 7C4 A/T ON-

VEHICLE S ERVI CE O PE R ATIONS.

2. Remove centre console assembly, refer to

Section 1A3 INSTRUMENT PANEL AND

CONSOLE.

3. Move the selector lever to the Drive position.

4. Using a c om mer ciall y a vail abl e T X 20 Torx Plus

and suitable equipment, remove the screw (1)

securing the selector lever knob to the shaft.

NOTE: While the view shown, indicates that the

selector control lever assembly must be removed

from the vehicl e, t his is no t the c as e f o r this s ervice

operation.

Figure 5B-79

5. Carefully lift the lower housing assembly from

the base, dis lodg ing the thr ee locat ing lu gs. Lif t

the lower ho using up enou gh to gain acces s to

the switch connectors.

6. Depress the connec tor locking tab and rem ove

the connector (1) from the switch. Repeat for

the ‘PW R ’ switch.

7. Disconnect the selector lamp holder (2) from

the lower housing by turning to the left

(counter- c loc kwise). Pu ll t o remove.

8. Lift the lower housing, upper cover, gearshift

lever, knob and boot assembly from the shift

lever.

Figure 5B-80

9. While holding the lower housing in an inverted

position, gently prise each of the four securing

lugs (1) to free the cover (2) from the lower

housing (3). Lift the lower housing (3) and

switches from the gearshift selector k nob, boot

and upper cover assembly (2). Carefully set

the knob, boot and upper cover to one side.

NOTE: If the lower housing assembly is not

inverted before separation, then the boot will

probabl y becom e dis lodged from the locati ng tangs

in the upper cover.

Figure 7C4-81

10. T o rem ove the T /C and/ or PW R s witch (1), use

a sm all bladed sc rewdriv er (2) and lever one of

the switch retain ing tangs fr om under the l ower

housing to free the particular switch, cock to

one side, release the second tang and then

remove the switch from above.

IMPORTANT: Take note of the locating lug on the

switch body that ensures the correct orientation of

the switch when reinstalled.

Figure 7C4-82

Manual Transmission Vehicles

1. Remove the centre console cap. Refer

Section 1A3 INSTRUMENT PANEL AND

CONSOLE, in the MY 2003 VY and V2 Series

Service Information.

2. Remove the auxiliary switch bezel from the

centre console cap, then remove the switch

from the bezel. Refer Section 1A3

INSTRUMENT PANEL AND CONSOLE for

specific details.

TEST

1. Using an ohmm eter, check the switch contacts

across the terminals detailed in the next table,

with the switch released and in the depressed

position. If any test fails, replace the switch.

Terminals Switch Button Result

3 and 4 Out Continuity

In Open Circuit

3 and 5 In Continuity

Out Open Circuit

2. If required the ‘PWR’ switch can be tested in

the same way.

NOTE: There should be a nominal resistance

across switch terminals 2 and 6, as this would

indicate that the illumination globe was OK.

Figure 5B-83

REINST ALL

Automatic Transmission Vehicles

As there are some critical aspects to the

reassem bl y process, ref er to Lower Housing, i n 3.3

Selector Control Lever Assembly, Reassemble, in

Section 7C4 A/T ON-VEHICLE SERVICE

OPERATIONS

Manual Transmission Vehicles

Refer to Section 1 A3 INSTRUM ENT PANEL AND

CONSOLE for T/C switch and console cap

reinstallation procedures.

3.10 THROTTLE RELAXER CONTROL MODULE (GEN III V8 ONLY)

LT Section No. – 04-730

REMOVE

1. Disc onnec t batt er y earth le ad.

2. Remove left hand front shroud panel lower

trim assembly (kick panel trim), refer to

Section 1A8 HEADLINING AND INTERIOR

TRIM in the MY 2003 VY and V2 Series

Service Information.

3. Using a flat bladed screw driver, push the

lower retaining tab (between the shroud lower

panel and the back of the throttle relaxer

control module mounting bracket) forward (1)

while lifting the base of the mounting bracket

outwards (2), approx imately two cent imetr es .

With the lower retaining tab disengaged, pull

the mounting bracket assem bly downwards (3)

to disengage the top retaining tab.

Figure 5B-84

4. Disconnect the throttle relaxer control module

connector by:

a. Lift the locking lever on the control module

connector (1).

b. Pull the top of connector away from control

module (2).

c. Lift connector upwards, disengaging the base

of the connector from the control module (3).

Figure 5B–85

5. Lift the two retaining tabs (1) on the mounting

bracket and slide the throttle relaxer control

module (2) out of mounting bracket.

Figure 5B–86

REINST ALL

Reinstallation of the throttle relaxer control module is the reverse of the removal procedure, noting the following:

1. To reconnect the throttle relaxer control module wiring harness connector, use the following procedure:

a. Hook base of connector into throttle relaxer control module.

b. Push top edge of connector into throttle relaxer control module using the base as a pivot.

c. Push locking lever down and towards the throttle relaxer control module.

d. Ensure lever seats flush with top of connector housing.

2. Turn ignition ON and observe the ‘ABS’ warning lamp. The lamp should illuminate for approximately

2 – 5 seconds and then turn off. If the warning lamp remains activated, refer to 4.4 ABS OR ABS/TCS

FUNCTIONAL CHECK in this Section.

3.11 THROTTLE RELAXER (GEN III V8 ONLY)

LT Section No. – 04-730

Refer to Section 6C3-3 POWERTR AIN MANAGEMENT - G EN III V8 ENGINE f or the corr ect procedure of how to

remove, reinstall and adjust the throttle relaxer assembly, accelerator and cruise control cables.

4. ABS, & ABS/TCS DIAGNOSIS

CAUTION: Certain components in the Anti-lock Brake System and Electronic Traction Control system are

not intended to be serviced individually. Attempting to remove or disconnect certain system components,

such as the solenoid valves or pump motor from the hydraulic modulator, may result in personal injury

and/or improper system operation. Only those components with approved removal and reinstallation

procedures described in 3. SERVICE OPERATIONS in this Section should be serviced.

Before attempting any diagnostic work on the ABS, refer to and read the 'SAFETY AND PRECAUTIONARY

MEASURES' as described in 3. SERVIC E OPERATIO NS in this Section.

4.1 GENERAL DESCRIPTION

The following information is necessary when diagnosing any Anti-lock Braking System problem or failure,

specifically it should be used to diagnose conditions that may cause the illumination of the ABS or TRAC OFF

warning displays in the instrument cluster.

Should conditions exist with the conventional (non ABS) portion of the braking system which cause the BRAKE

FAILURE warning lamp to illuminate (also in the instrument cluster), or there is some other obvious brake

mechanical problem, such as brake noise, brake pulsation (pedal or vehicle vibration during normal brake

application), brake pull or a parking brake problem, then these problems must be corrected before attempting to

rectify any suspected ABS problem. Refer to Section 5A SERVICE AND PARK BRAKING SYSTEMS in the MY

2003 VY and V2 Series Service information for diagnosis and repair of the conventional braking system.

4.2 BASIC KNOWLEDGE REQUIRED

Before attem pting to diagnose the Anti-lock Brake System or Electronic Traction Control system , you m ust have a

good understanding of electrical system basics and the use of circuit testing tools. W ithout this basic knowledge it

will be difficult to use the diagnostic procedures detailed in this Section.

Some elec trical basics , troubl eshootin g procedur es a nd hints as well as the use of cir cuit testi ng tools are c overed

in Section 12P WIRING DIAGRAMS in MY 2003 VY and V2 Series Service Information.

Basic Electrical Circuits - You should understand the basic theory of electricity, series and parallel circuits, and

voltage drops across series resistors. You should know the meaning of voltage (volts), current (amps), and

resistanc e (o hms ) . You sho uld un der s tan d what ha ppe ns in a c irc uit with an op en or shor te d wir e (s hor t ed ei t her to

voltage or ground). You should also be able to read and understand a wiring diagram.

Use of Circuit Testing Tools – You should k now how t o use a jum per lead t o test c ircuits. You s hould be fam iliar

with the use of a hi gh inp ut impedanc e (10 Meg ohm ) digita l t ype multim eter such as tool No. J 3920 0 or eq uivalent

and be abl e to measure v oltage, curr ent, and resis tance. You s hould be fam iliar with t he proper us e of the Tec h 2

Diagnostic Sc an Tool .

4.3 VISUAL INSPECTION

When investigating any complaint of an ABS or ABS/TCS system problem or malfunction, start diagnosis with an

ABS, ABS/TCS visua l ins p ec tion .

The ABS, ABS/TCS visual inspection is an examination of easily accessible components that could cause

problems with the system. The visual inspection procedure may quickly identify the cause and elim inate the need

for additional diagnosis.

If the complaint condition cannot be resolved by a visual check of the system components, then proceed to the

ABS, ABS/TCS Functional Check following on after the Visual Inspection Chart.

ABS, ABS/TCS VISUAL INSPECTION CHART

ITEM INSPECT FOR CORRECTIVE ACTION

GENERAL

Wheel and Tyres Recommended tyre and wheel

size fitted to vehicle Fit recommended size tyres

and wheels

BRAKE SYSTEM COMPONENTS

Master Cylinder Fluid Reservoir Low fluid level Add fluid as required.

Determine cause of fluid loss

and repair

Hydraulic Modulator External leaks If leakage is excessive,

replace modulat or

Brake Booster And Master

Cylinder Correct instal lati on and

assembly Reinstall or reposition

components correctly

Park Brake Mechanism Mechanism fully releasing Operate lever to verify release.

Adjust cable or repair release

system as required

FUSES

ENGINE COMPARTMENT

ABS Fusible Link F103 Blown fusible link Replace fusible link. Inspect

for cause of failure

PASSENGER COMPARTMENT

ABS Fuse F27 Blown fuse Replace fuse. Inspect for

Warning Lamp Fuse F13

(Ignition Circuit) cause of fuse failure

Stop Lamp Fuse F5

WIRING CONNECTIONS

ENGINE COMPARTMENT

ABS or ABS/TCS control module

Wiring Harness Connector

In all cases, inspect for:

Main Wiring Harness To Front

Wheel Speed Sensor

Connections

Proper engagement.

Loose wires or terminals.

Ensure proper engagement

Repair as required

Hydraulic modulator pump motor

wiring harness connector Corroded or broken

connections

PASSENGER COMPARTMENT

Main Wiring Harness To Body

Harness Connectors

UNDER VEHICLE

Front Wheel Speed Sensor Lead

To Front Wheel Hub Connections

Body Harness To Rear Wheel

Speed Sensor Connections

4.4 ABS & ABS/TCS FUNCTIONAL CHECK

If the source of the system problem or malfunction was not isolated during the ABS, ABS/TCS visual inspection,

carry out the following ABS, ABS/TCS functional check. Also, use the check to verify normal ABS or ABS/TCS

operation during diagnosis or after making any system repairs.

ABS & ABS/TCS FUNCTIONAL CHECK CHART

STEP ACTION YES NO

1 Has ABS, ABS/TCS Visual Inspection been performed?

Go to Step 2. Perform ABS, ABS/TCS

Visual Inspection – refer

4.3 in this Section before

proceeding.

2. While observing the Brake Failure warning lamp, turn the

ignition to the Bulb Check position (engine cranking position).

Does the Brake Failure warning lamp illuminate?

Go to Step 3. Check warning lamp

circuit, refer to Section

12C in the MY 2003 VY

and V2 Series Service

Information.

3. 1. Turn ignition OFF.

2. Turn ignition ON whilst observing ABS or ABS and TRAC

OFF warning display.

3. Do warning displays activate for approximately 3 seconds

(5 seconds for TRAC OFF display) then turn OFF?

NOTE: If engine is started, warning displays will activate for

only 2 seconds

Go to Step 6. Go to Step 4.

4. 1. Install Tech 2 to DLC.

2. Select Chassis / ABS/TCS and press CONFIRM.

3. Does Tech 2 communicate with the ABS by displaying the

System Identification Information?

Go to Step 5. Refer to DTC 72 -

SERIAL DATA FAULT

Diagnosis in this Section.

5. 1. With Tech 2 still connected, select Diagnostic Trouble

Codes / Read DTCs.

2. Are any DTCs set?

Go to Step 6. Refer to Charts A1, A2

(WARNING DISPLAYS

INOP) or CHARTS C1,

C2 (WARNING

DISPLAYS ACTIVATED

CONTINUOUSLY) in this

Section.

6. 1. Select relevant DTC Function Key.

2. Are the ignition cycles zero (0)? Refer to relevant ABS

or ABS/TCS DTC chart

in this Section.

Refer to 4.5

INTERMITTENT

FAILURES in this

Section.

7. 1. Road test vehicle, ensuring to achieve at least a speed of

35 km/h.

2. Did the ABS warning display turn on during the road test?

Go to Step 5. Go to Step 8.

8. During the road test, did the vehicle exhibit any symptoms or

improper operation that may be mechanical in nature and/or

did the Brake Failure warning lamp turn ON?

Refer to Section 5A

SERVICE AND

PARKING SYSTEMS

MY 2003 VY and V2

Series Service

Information for repair

details.

Go to Step 9.

9. 1. Install Tech 2 to DLC and turn ignition ON.

2. Check for any ABS History DTCs.

3. Are any History DTCs present (1 or more ignition cycles)?

Refer to relevant ABS

or ABS/TCS DTC

diagnostic chart in this

Section. Chart may be

used to identify and

isolate suspected

failures. Also, refer to

4.5, INTERMITTENT

FAILURES in this

Se ction for m ore

information on isolating

suspected failures.

Clear all DTCs and

repeat this function al

check.

If a failure is still

suspected, refer to 4.5,

INTERMITTENT

FAILURES in this

Section.

If not, system check OK.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

4.5 INTERMITTENT FAILURES

As with most electronic systems, intermittent failures may be difficult to accurately diagnose. The following is a

method to try to isolate an i ntermittent fail ur e, es pecia ll y whee l spee d circui try failures .

If the control module detects an ABS fault, the ABS warning display will activate during the ignition cycle in which

the fault was detected and a Diagnostic Trouble Code (DTC) will be logged in memory of the control module.

If an TCS f ault occurs, either the TRAC OFF and /or ABS warni ng displa y will activate, if the fault is spec ific to the

TCS system, both the TRAC OFF and the ABS warning displays will activate, if the fault is common to both

systems.

If an interm ittent problem occurs, the TRAC O FF and/or ABS warni ng display will go out (if the fault cor rects itself )

after the ignition has been cycled off and on. Also stored in the control module mem ory, will be the histor y data of

the DTC at the time the fault occurred. This history data includes the number of Ignition Cycles since the DTC

occurred, if the Ignition Cycle is zero, then the DTC is Current, if the Ignition C ycles is greater than zero, then the

DTC is a history DTC. Tech 2 can be used to read ABS or ABS/TCS data;

1. If a s ystem fault has bee n detecte d, rec ord a ll cur rent tr ouble co des a nd tr ouble c ode his tor y infor m ation. Als o,

if available, record any specific driving condition during which the problem or failure occurs. This information

can help in duplic a tin g th e condition.

2. Clear any trouble codes that are stored in the control module memory, refer 'CLEARING DTCs' in this Section.

3. Using the Tech 2 in Snapshot mode while test-driving the vehicle, try to duplicate the condition in which the

problem or fault occurs. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for additional information on the

use of Tech 2.

NOTE: IN CERT AIN DIAGNOSTIC MODES, THE ANTI-LOCK BRAKING SYSTEM IS DISABLED WHILE T ECH

2 IS COMMUNICATING WITH THE ABS OR ABS/TCS CONTROL MODULE.

If an intermittent condition is still undetected, or not related to the wheel speed circuitry, go to the appropriate

Diagnostic Trouble Code (DTC) or symptom chart in this Section. Follow through the Chart while moving or

wiggling the associated ABS or ABS/TCS wiring harnesses and connectors, and at the same time looking for

intermittent type failures in the circuitry.

Most intermittent problems are caused by faulty electrical connections or wiring. When an intermittent failure is

encountered, check suspect circuits for:

1. Poor mating of connector body halves or terminals not fully seated in the connector body (backed out).

2. Improperly formed or damaged terminals. If damaged, carefully reform terminals in a suspected circuit.

3. Poor terminal to wire connection . This requires rem oving the term inal from the connector bo dy to inspect (ref er

to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2 Series Service Information).

Also, du e to the sensitivity of ABS or ABS/TCS components to Electro-Magnetic Interference (EMI), the follo wing

checks should be performed if an intermittent malfunction is suspected:

1. Check for proper installation of wiring harnesses resulting from add-on options such as a CB radio or cellular

telephone etc .

2. Visually inspect wheel speed sensors and pulse rings for looseness, damage, foreign material accumulation

and proper mounting. Replace damaged components, remove any foreign material and/or properly attach all

components.

3. Check for proper routing of front wheel speed sensor wiring near spark plug leads. Refer to IGNITION

SYST EM, in 6C1-3 (V6), 6C2-3 or 6C3-3 (GEN III V8) for spark plug lead routing.

4. Measure resistance of spark plug leads (refer to IGNITION SYSTEM, in 6C1-3 (V6), 6C2-3 or

6C3-3 (GEN III V8) for details) Replace any leads if not to specification.

5. While test driving vehicle, monitor wheel speeds using Tech 2. If any wheel speed drops or displays erratic

speed, refer to the appropriate wheel speed DTC chart in this Section.

If detected, ABS failures will disable the anti-lock brake function of an entire ignition cycle, even if the condition

clears itself before the ignition is switched off. However, the clearing of low voltage failure conditions during an

ignition cycle will allow ABS operation to resume.

If an TCS failure is detected, both the anti-lock braking and traction control functions will be disabled for an entire

ignition cycle, even if the condition clears itself before the ignition is switched off. However, the clearing of low

voltage failure conditions during an ignition cycle will allow ABS and TCS operation to resume.

4.6 ABS & ABS/TCS SELF DIAGNOSTICS

DIAGNOSTIC TROUBLE CODES

The ABS and ABS/TCS control modules are equipped with a self diagnostic capability that can detect and isolate

ABS and ABS/TCS problems or failures. When a problem or failure is detected, the ABS or ABS/TCS control

module sets a diagnostic trouble code (DTC) that represents that particular problem or failure. There are twenty

one DTCs on ABS an d twe nty nin e on A BS/T CS s ystem s that m ay be set b y the ABS or ABS/T CS contr ol m odule.

Depending on the DTC set, either the ABS, TCS or both ABS and TCS systems will be disabled. If the ABS is

disabled, it will allow for conventional non ABS braking only and the ABS warning display will be activated.

NOTE: Warning display will activate whilst fault is active. If a fault has occurred and is not active, the display will

not be activated and a fault code will be stored.

The control module performs an automatic test once during each ignition cycle when the vehicle reaches

approximately 6 km/h. The automatic test cycles each solenoid valve and the pump motor to check component

operation. If any error is detected during this test, the ABS or ABS/TCS control module will set a DTC. This test

may be heard and felt while it is taking place and is a normal mode of operation.

The ABS or ABS/TCS control module can display

the DTCs via the ABS warning display only when

the 'Diagnostic Service Mode' has been entered.

Entering the diagnostic service mode is

accomplished by either grounding terminal 12 of

the Data Link Connector (DLC) using a test lead

fitted with suitable terminals and using

ABS warning display to flash system DTCs as

described under Flash Code Diagnostics Display

in this Section or by using Tech 2 (refer to

4.7 TECH 2 DIAGNOSTICS in this Section).

Figure 5B-87

FLASH CODE DIAGNOSTICS DISPLAY

To enable th e ABS warnin g display to f lash system

DTCs, the vehicle must be stopped (vehicle speed

is less than 10 km/h), terminal ‘12’ of the DLC (1)

grounded (DLC terminal ‘5’) using a test lead (2)

fitted with suitable terminals and then the ignition

turned on. The flash code diagnostics will remain

enable d as long as term inal ‘12’ is grou nded, serial

data line communication has not been initiated or

until any wheel speed is greater than 10 km/h.

Approximately 3 seconds after grounding terminal

‘12’ of the DLC, the ABS or ABS/TCS control

module will begin flashing the ABS warning display.

The flash sequence will begin with DTC 12 to

signal the b eginning of the flash code displa y. DTC

12 will f lash t hree tim es . Eac h stored code will then

be displa yed thr ee tim es . After all codes h ave be en

displayed, the sequence will repeat, starting with

DTC 12.

The c harts on the next pag e set out all th e possi ble

diagnostic trouble codes.

NOTE: Flash code diagnosis is not fully supported

on certain trouble codes involving the solenoid

valves or motor due to the valve relay inside the

control unit being disabled. Trouble codes 41, 42,

45, 46, 47, 48, 55, 56, 61 and 63 will prevent the

ABS warning display from turning off. These faults

can only be read through the DLC using Tech 2.

Figure 5B-88

Techline

Figure 5B-89

ABS DIAGNOSTIC TROUBLE CODES

DTC CODE DESCRIPTION

12 No Fault

21 Front Right Wheel Speed Sensor Incorrect Signal

23 Front Right Wheel Speed Sensor Short Circuit or Open Circuit

25 Front Left Wheel Speed Sensor Incorrect Signal

27 Front Left Wheel Speed Sensor Short Circuit or Open Circuit

28 Wheel Speed Sensor Frequency Error

31 Rear Right Wheel Speed Sensor Incorrect Signal

33 Rear Right Wheel Speed Sensor Short Circuit or Open Circuit

35 Rear Left Wheel Speed Sensor Incorrect Signal

37 Rear Left Wheel Speed Sensor Short Circuit or Open Circuit

41 Front Right Inlet Valve Solenoid Fault

42 Front Right Outlet Valve Solenoid Fault

45 Front Left Inlet Valve Solenoid Fault

46 Front Left Outlet Valve Solenoid Fault

55 Rear Axle Inlet Valve Solenoid Fault

56 Rear Axle Outlet Valve Solenoid Fault

61 Pump Motor or Relay Fault

63 Valve Solenoid Relay Cir cuit Fault

67 Stop Lamp Switch Circuit Fault

71 Control Module Internal Fault

85 System Voltage Too Low

ABS/TCS DIAGNOSTIC TROUBLE CODES

DTC CODE DESCRIPTION

12 No Fault

21 Front Right Wheel Speed Sensor Incorrect Signal

23 Front Right Wheel Speed Sensor Short Circuit or Open Circuit

25 Front Left Wheel Speed Sensor Incorrect Signal

27 Front Left Wheel Speed Sensor Short Circuit or Open Circuit

28 Wheel Speed Sensor Frequency Error

31 Rear Right Wheel Speed Sensor Incorrect Signal

33 Rear Right Wheel Speed Sensor Short Circuit or Open Circuit

35 Rear Left Wheel Speed Sensor Incorrect Signal

37 Rear Left Wheel Speed Sensor Short Circuit or Open Circuit

41 Front Right Inlet Valve Solenoid Fault

42 Front Right Outlet Valve Solenoid Fault

45 Front Left Inlet Valve Solenoid Fault

46 Front Left Outlet Valve Solenoid Fault

47 Priming Valve Solenoid Fault

48 Switching Valve Solenoid Fault

51 Rear Right Inlet Valve Solenoid Fault

52 Rear Right Outlet Valve Solenoid Fault

55 Rear Left Inlet Valve Solenoid Fault

56 Rear Left Outlet Valve Solenoid Fault

58 Throttle Relaxer PWM (Pulse Width Modulation) Interface Fault

61 Pump Motor or Relay Fault

62 RPM Signal Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections

63 Valve Solenoid Relay Cir cuit Fault

64 Throttle Relaxer Control Module Position Fault

65 Throttle Relaxer Motor Fault

66 Throttle Relaxer Control Fault

67 Stop Lamp Switch Circuit Fault

68 TPS (Throttle Position Sensor) Monitoring Fault

71 Control Module Internal Fault

72 Serial Data Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections)

73 Spark Retard Monitoring Fault (refer diagnostic charts in both the V6 and GEN III V8 Sections)

73 Requested Torque Cir c uit F ault – V6 Eng in es Onl y

74 Actual Torque Circuit Fault – V6 Engines Only

78 Incorrect Option Coding

85 System Voltage Too Low

NOTE: Regardless of the engine fitted to the vehicle, for those DTCs displayed in normal text, refer to

4.9 DIAGNOSTIC CHARTS – V6 Engines, in this Section. For those DTCs displayed in bold text, refer to

5.9 DIAGNOSTIC CHARTS – GEN III V8 Engine, also in this Section. Exceptions to this general rule are; DTCs,

62, 72 73 a nd 74, wher e th e di agn os tic c har ts s h oul d be f oll o wed f or the specif ic eng ine f itt ed i.e . th e V 6 or GEN III

V8 engine.

CLEARING DTCs

Any DTCs stored in the ABS or ABS/TCS control

module's memory can be erased in one of three

ways:

1. Diagnostic Request Line Procedure.

2. Tech 2 Clear Codes Selection.

3. Ignition Cycle Default.

These three methods are detailed as follows.

IMPORTANT: Whichever method is used, be

sure to verify proper system operation and

absence of any DTCs when clearing procedure

is completed. The ABS or ABS/TCS control

module will not permit DTC clearing until all of

the codes have been displayed. Also, DTCs

cannot be cleared by unplugging the ABS or

ABS/TCS control module, disconnecting the

battery cables, or turning the ignition OFF

(except on an ignition cycle default).

Diagnostic Request Line Procedure

To clear trouble codes via the DLC (1) diagnostic

request line, terminal 12 (12), go through the

follo wing proc ed ur e.

1. Turn ignition OFF.

2. Connect a test lead (2) fitted with suitable

terminals between DLC terminal 5, circuit 155,

black/yellow wire (5) and terminal 12, circuit

863, blue/black wire (12).

3. Turn ignition on (this will enable Flash Code

Diagnostics Display) and allow all codes to be

displayed.

4. Disconnect one end of test lead from DLC for

approximately one second then reconnect for

no less than one second. Repeat this step at

least two more times within 10 seconds,

leaving test lead connected to DLC upon

completion of final connection.

Observe flashing ABS warning display. Only DTC

12 should b e f las hed . If not , tr oub le cod es hav e no t

been properly cleared. Begin clearing code

procedure again at Step 1. If DTCs are cleared,

wait at least 15 seconds before turning ignition

'OFF'.

Figure 5B-90

Figure 5B-91

TECH 2 Clear Codes Procedure

Before clearing DTCs, check and note any history code data, as this information will also be cleared.

Select the appropriate menu, and select the Clear Codes function. Verify that DTCs have been cleared by using the

Tec h 2 to read ABS or ABS/T CS tr ouble cod es. If any are pres ent, e ither the DT Cs were not clear ed, or an ABS or

ABS/TCS fault still exists.

Ignition Cycle Default

If the ig nition is c ycled 100- tim es without a pa rticular f ault reap pearing, that fault code wil l be erased f rom the A BS

or ABS/TCS control module memory, and the ignition cycle counter inside the control module will be reset to zero.

4.7 TECH 2 DIAGNOSTICS

IMPORTANT: When using the Tech 2 in certain diagnostic modes for ABS or ABS/TCS diagnosis, the Anti-lock

Brak e System is disable d by the A BS or AB S/TCS co ntrol m odule while it is c omm unicating with Tech 2. T he ABS

warning display in the instrument cluster will be activated, indicating only conventional (non ABS) braking is

possible.

NOTE: Within this Section, the Anti Lock Braking System/Traction Control System (ABS/TCS) is shown on the

Tech 2 screen, as “ABS/ETC” (Anti Lock Braking System/Electronic Traction Control). These systems are to be

regarded as being one and the same for the purposes of diagnosis.

W hen connected to t he Dat a Link Connector (DLC)

with the ap pr opri ate s of twa re, c abl es and ada ptor s ,

Tech 2 is capable of reading ABS or ABS/ETC

serial data. The DLC is connected to the

instrument panel lower right hand trim, to the right

of the steering column.

For additional general information on connecting

and operat ing T ech 2, refer to Section 0C T ECH 2

in the MY 2003 VY and V2 Series Service

Information.

Legend:

1. Data Link Connector (DLC)

2. DLC ADAPTOR

3. DLC CABLE

4. Tech 2 Scan Tool

Figure 5B-92

The Tech 2 has five test modes for diagnosin g the

Anti-lock Brake System and Electronic Traction

Control system. The five test modes are as follows:

MODE F0: NORMAL MODE

In this mode, the Tech 2 monitors the constant

communication between control modules on the

serial data line. The information displayed on the

Tech 2 screen in this mode is what the ABS or

ABS/ETC control module is communicating to the

other modules via the serial data line.

MODE F1: DIAGNOSTIC TROUBLE CODES

In this mode, Tech 2 will display a DTC selection

list. When the appropriate function key is selected,

the Tech 2 will display a DTC Data List. The Data

List contains relevant information relating to the

DTC.

MODE F2: DATA DISPLAY

In this test mode, the operator of Tech 2 has the

option of selecting an Active or Disabled data

stream that they can use to constantly monitor the

status of inputs and outputs of the ABS or

ABS/ETC system.

Figure 5B-93

MODE F3: SNAPSHOT

In this test mode, the Tech 2 captures ABS or

ABS/ETC data before and after a forced manual

trigger.

MODE F4: MISCELLANEOUS TESTS

In this test mode, the Tech 2 performs system

functiona l tests to as s is t in pr oblem is olat ion du rin g

troubleshooting. Each test mode has specific

diagnosis capabilities that depend upon various

function key entry on the Tech 2. Also, included in

the MISCELLANEOUS TESTS is a procedure for

ABS or ABS/ETC brake bleeding.

4.8 TECH 2 TEST MODES AND SCREEN DISPLAYS FOR ABS & TCS DIAGNOSIS

CAUTION: When using Tech 2 for ABS and

ABS/TCS diagnosis, in certain diagnostic

modes, the system will be disabled.

NOTE: Where Tech 2 is concerned, the

terminology quoted, reflects Tech 2 language; e.g.

ABS/TCS will be displayed on the Tech 2 screen,

as ‘ABS/ETC’. Therefore the diagnostic tables will

also reflect this usage.

As a prerequisite to this diagnostic section, the

user must be familiar with the proper use of Tech

2, as the following pages illustrate only the major

Tech 2 screen displays and provide a brief

explanation of their function for diagnosing the

ABS or A BS/TC S system s . If additio nal inf orm ation

is required on the operation of Tech 2, refer to

Section 0C T ECH 2 or the TECH 2 OPERAT OR’S

MANUAL.

SYSTEM SELECT MENU

With Tech 2 connected to the DLC and ‘F0:

Diagnostics’ selected from the ‘Main Menu’, the

correct ‘Model Year’ and ‘Vehicle Type’ must then

be selected to access the System Select Menu, as

shown.

Select ‘F2: Chassis’ and press ‘Enter’ to continue.

NOTE: If DTC Check is selected, Tech 2 will

displa y inform ation advis ing if any DT Cs are set by

any modu le. (If DTCs are set f rom another m odule,

refer to the relevant Section in the MY 2003 VY

and V2 Series Ser v ice Infor mation) .

Figure 5B-94

VEHICLE IDENT IF ICATION M ENU

After ‘F2: Chassis’ has been selected from the

System Select Menu, the only available option to

select is, ‘ABS/ETC’.

When ‘ABS/ETC’ is selected, several further

screens will then be presented, that require some

action on the part of the Tech 2 operator.

Figure 5B-95

SYSTEM IDENTIFICATION

Turn the ignition ‘On’ (as r equested) and press the

‘Confirm’ soft key to continue.

Figure 5B-96

The ‘Chassis’ screen will then display the control

module part number and system identification.

Press the Confirm soft key to continue to the

‘Chassis’ function choices, screen.

Figure 5B-97

ABS/ETC FUNCTION CHOICES MENU

The following functions are now available:

F0: Normal Mode

F1: Diagnostic Trouble Codes

F2: Data Display

F3: Snapshot

F4: Miscella neous Tests

Figure 5B-98

F0: Normal Mode

In the ‘F0: Norm al Mode’, information that the ABS

or ABS/ETC control module is communicating to

other control modules, is displayed via the serial

data line.

For example; as shown, the ETC Warning display

status is On. This means the ABS or ABS/ETC

control module is communicating with the

instruments requesting the ‘TRAC OFF’ warning

displa y to be activate d.

Figure 5B-99

F1: Diagnostic Trouble Codes

If the F0: Read DT Cs is selec ted from this mode, a

listing of all (if any) DTCs numbers that have been

set by the ABS or ABS/ETC control m odule will be

displayed. To obtain further information about a

particu lar DTC, pres s the rele vant f unction k ey and

a DTC data list will be displayed. From the

information provided in this data list, you can

determine when the DTC occurred and the

operating conditions of the system at the time.

For a listing of all DTCs, refer to

4.6 ABS & ABS/TCS SEL F DIAGNOST ICS in this

Section.

DTCs c an be cleared by sim ply selec ting ‘F1 Clear

DTCs’ and pressing the Enter key on the Tech 2

keyboard.

NOTE: If any DTCs are set, reference should be

made to the relevant diagnostic charts in this

section.

Figure 5B-100

F2: Data Display

If the F2: DATA DISPLAY mode is selected, an

additional application menu will appear giving the

operator the option of selecting ABS or ABS/ETC

data while the system is either active or disabled.

F0: Active ABS/ETC

F1: ABS/ETC Disabled

If the disabled data list is selected, the ABS

warning display will be activated and the system

will become disabled.

While the two data lists offer similar information,

the active data list has the advantage of monitoring

the ABS or ABS/TCS systems while either system

is operational, assisting in the diagnosis of

intermittent faults.

When monitoring speed data, the Tech 2 screen

displays the signals being sent from the wheel

speed sensors to the control module. In F0: Active

ABS/TCS display mode, the vehicle can be driven

while the Tech 2 dis p lays whee l speed dat a. At th is

time, the readings may be compared with vehicle

speed to check proper operation. Wheel speed

signals can also be compared with each other to

determine whether they are within specification.

If one wheel speed signal differs greatly from the

other signals, improper operation of that particular

sensor may be indicated. Intermittent wheel speed

signals can be detected in this mode by looking f or

signals that vary for no apparent reason.

Figure 5B-101

This variation can occur during vehicle operation

and can be captured during F3: SNAPSHOT test

mode.

For additional information regarding the soft keys

while in the DATA DISPLAY mode, refer to

Section 0C TECH 2 in the MY 2003 VY and V2

Series Service Information.

The table below lists each item contained in the

data stream for both active and disabled lists

together with a brief description of their meanings.

ACTI V E ABS/ E TC

DATA STREAM / SCREEN DISPLAY DESCRIPTION

FR Wheel Speed (Front Right)

FL Wheel Speed (Front Left)

RR Wheel Speed (Rear Right)

RL Wheel Speed (Rear Left)

Displays wheel speed sensor input (km/h) to the control module.

Pump Motor Displays current status of pump motor – either ON or OFF.

Pump Relay Displays current status of pump relay – either ON or OFF.

Valve Relay Displays current status of valve relay – either OPEN or Closed.

ETC Switch Displays current status of switch – will display OPEN when switch is in the

rest position and CLOSED when held down (TCS Only).

Requested Torque (V6 Engines Only) Displays the amount of torque the ABS/TCS control module is requesting the

engine to deliver (TCS Only).

Actual Torque (V6 Engines Only) Displays the calibrated torque (in Nm) that the engine is delivering (TCS

Only).

Requested Throttle (GEN III V8 Engine

Only) Displays the percentage of throttle opening the ABS/TCS control module has

requested the throttle relaxer control module to supply.

Actual Throttle Position (GEN III V8 Engine

Only) Display the actual percentage the throttle body valve is open.

ABS/TCS DISABLED

DATA STREAM / SCREEN DISPLAY DESCRIPTION

FR Wheel Speed (Front Right)

FL Wheel Speed (Front Left)

RR Wheel Speed (Rear Right)

RL Wheel Speed (Rear Left)

Displays wheel speed sensor input (km/h) to the control module.

Stop Lamp Switch Displays current status of switch - displays OFF when switch is in the rest

position and ON when brake pedal is depressed.

Pump Monitor Will always display OFF as ABS and TCS are disabled in this mode.

Valve Relay Displays current status of valve relay - either OPEN or CLOSED.

NOTE: If OPEN is displayed in this mode, there is a fault in the valve relay

circuit.

ETC Switch Displays current status of switch - displays OPEN when switch is in the rest

position and CLOSED when held down (TCS Only).

Engine Speed Displays the current engine speed in RPM (TCS Only).

Requested Torque (V6 Engines Only) Displays the amount of torque (in Nm) the ABS/TCS control module is

requesting the engine to deliver (TCS Only).

Actual Torque (V6 Engines Only) Displays the calibrated torque (in Nm) that the engine is delivering (TCS

Only).

Engine Speed (GEN III V8 Engine Only) Displays the current engine speed in RPM.

Throttle Position (GEN III V8 Engine Only) Displays the current throttle position( percentage of throttle valve opening).

System ID Displays control module internal software identification number.

F3: Snapshot

The snapshot mode will help to identify problems

caused by speed sensor signals that may cause

intermittent operation of the ABS or ABS/ETC

systems.

The SNAPSHOT mode captures data before and

after a forced manual trigger condition.

Figure 5B-102

F4: MISCELLANEOUS TESTS

In the Miscellaneous tests mode, functional tests

are avai lable on t he ABS or ABS/ET C s ystems that

will help identify proper operation. In this mode,

error conditions can be further identified by testing

and observing the test results.

Additionally, in this mode, the hydraulic modulator

can be bled (F2: BRAK E B LE ED).

In the MISCELLANEOUS TESTS mode the

following tests can be performed:

F0: Solenoid

This test indica tes whether specif ic soleno id va lves

in the hydraulic modulator release pressure to

assigned hydraulic wheel circuits and hold

pressur e in assign ed h ydr a ulic wheel circu its .

NOTE: Use this procedure in conjunction with the

information displayed on the Tech 2 screen in the

F0: SOLENOID test mode.

The PRESSURE RELEASE part of the test

activates a selected hydraulic wheel circuit valve,

placing it in the pressure release position. Valve

action can then be verified by checking the

appropriate wheel for proper brake action.

Figure 5B-103

The PRE SSURE HOLD part of the test ac tivates a select ed hydrau lic whee l circuit valve, p lacing it in the pr essur e

hold position. Valve action can then be verified by checking the appropriate wheel for proper brake action.

These tests completely check each solenoid valve. W ith an assistant, the pressure release and hold tests can be

verified as follows:

1. Ignition OFF.

2. Raise vehicle such that the wheels are at least 150 mm off the floor.

3. Install Tech 2 to the DLC.

4. Select Diagnostics / Chassis / ABS/ETC and turn ignition on and confirm System Identification information as

instructed.

5. Select Miscellaneous Tests / Solenoids.

6. Select the relevant solenoid to be tested and press ENTER.

7. Follow instructions on the Tech 2 display screen while getting an assistant to try to spin the road wheel being

tested when requested by Tech 2.

NOTE: This test verifies the ability of the solenoid valves to control the hydraulic functioning of the system. The

electrical function is verified by the constant monitoring of the circuits by the ABS/ETC control module during

normal operation of the system. If the control module detects an electrical problem, such as a solenoid open or

short to ground, a DTC will be set and the system disabled.

F1: Auto Test

The AUT O test is performed automatically by the control module once during each ignition cycle when the vehicle

reaches approxim ately 6 km/h. The Tech 2 will perform this test automatically during the ABS TESTS mode. The

AUTO test cycles each solenoid valve and the pump motor briefly to check component operation. If any error is

detected dur ing this tes t, the control m odule will set a DT C and the ABS and or TRAC OF F warning dis play will b e

activated. Perform the test as follows:

NOTE 1: Use th is proce dure i n conjunc tion with the inf orm ation displa yed on t he Tec h 2 SCREEN while in the F1:

AUTO TEST, test mode.

NOTE 2: If there are any DTCs set, they will have to be cleared before this test can be performed.

Procedure

1. Turn ignition OFF.

2. Install Tech 2 to the DLC.

3. Select Diagnostics / Chassis / ABS/ETC and turn ignition on and confirm System Identification information as

instructed.

4. Select M iscellan eous T ests / Auto T est and pres s the CONT INUE sof t k ey on Te ch 2 to s tart test (ret urn p um p

will be heard to run for short period).

5. Note any DTCs that are set when test is completed.

F2: Brake Bleed

This test prompts the Technician to b leed the brak e system . The test is divided into t wo parts; a pr imar y bleed and

a second ar y b lee d. A primar y blee d is a manua l bleed of each hydraul ic cir cui t. D ur ing a s ec ondar y bleed, the A B S

or ABS/TCS control module activates the solenoid and pump motor so that any air in these components is

expelled.

NOTE: The AUTO TEST must be carried out before conducting the brake bleed procedure. If the automatic test

has not been conducted, carry out this test, as described under F1: AUTO TEST, in this Section.

The brake bleed procedure is as follows:

1. Instal l brake bleed ing equipm ent to vehic le as recom mended in Se ction 5 A SERVICE AND PARK BR AKI NG

SYSTEMS in the MY 2003 VY and V2 Series Service Information.

2. Turn ignition OFF.

3. Install Tech 2 to DLC.

4. Select Diagnostics / Chassis / ABS/ETC and turn ignition on. Confirm System Identification information as

instructed.

5. Select Miscellaneous Tests / Brake Bleed and follow instructions on the Tech 2 display screen.

NOTE: The Tec h 2 scr een will disp la y “RUN AUT O TEST PRIOR T O BRAKE BL EED. DONE?” Sel ect YES or NO .

The AUT OMATI C TEST must be carr ied out prior to conduc ting the br ake bleed pr ocedure. If the aut o test has not

been conducted, select NO and carry out test as described under F1: AUTO TEST.

If the auto test has been completed, select YES and continue.

The procedure will begin with a manual bleed at the right hand rear brake caliper. Ensure a suitable size plastic

hose is installed over the bleed screw and that it leads into a container of brake fluid.

W hile fo llo wing t he b lee d proc edur e, as per Tech 2 ins t r uct ions, ens ur e t hat f lui d is c ontinu ous ly fed int o the m ast er

cylinder especially while the secondary circuit is being bled.

4.9 DIAGNOSTIC CHARTS – V6 ENGINES

INTRODUCTION

The following diagnostic charts are designed to provide fast and efficient fault location of the ABS or ABS/TCS

systems. Each diagnostic chart consists of: a ‘diagnostic chart’, connector body terminal assignments for

connectors relevant t o that par ticular d iagnostic c hart, and pertinent inform ation inc luding Dia gnostic T rouble Code

(DTC) setting parameters and circuit diagrams.

The following figures illustrate the term inal layout of the various connectors used in the system. This figure should

be used in conjunction with the diagnostic chart circuit diagrams when checking circuit faults if the connector

diagram is not included in the chart.

When carrying out wiring checks as directed to by the diagnostic charts, rather than probe terminals and

connectors with incorrect sized multimeter connections, use the adaptors contained in connector test adaptor kit

KM-609. T his will pre ven t an y possib ilit y of spread ing or dam aging wir ing har ness terminals.

On-Vehicle Service

When a diagnostic chart in this Section makes reference to removing/reinstalling or checking a component for

proper mounting or operation, refer to the appropriate service operation in this Section. After all diagnosis and

repairs ar e c ompleted, ro ad - tes t the ve hic l e to e ns ure pr oper A BS a nd AB S/TCS oper at io n and t he A BS a nd TRAC

OFF warning d ispla ys do not com e on, refer to 4.4 FUNCTIONAL CHECK in this Sectio n. If the Tech 2 was used

for diag nos is , disc onn ec t it f r om the DLC and turn the i gnit io n O FF f or at leas t 10 s ec onds bef or e road testi n g. This

is necessary to reset the ABS or ABS/TCS control module as it is disabled during most Tech 2 diagnostic

procedures, and does not reset until serial data communication is stopped and ignition power is lost.

Wiring Harness Connectors

Figure 5B-104 – V6 and V6 Supercharged Engines, Wiring Harness Connectors

Legend

A15 Body Control Module

A18 Cruise Control Module

A40 DIS Ignition Module

P3 Instrument Cluster

S22 Automatic Transmission Shift

S73 TCS Control Module

S149 Ignition & Start Switch

X40 Data Link Connector (DLC)

X200 Body Wiring Harness to Main

Wiring Harness

X206 Main Wiring Harness to Powertrain

Wiring Harness

Figure 5B-105 – V6 and V6 Supercharged Engines, Wiring Harness Connectors

Legend

A84 Powertrain Control Module – V6 and V6 S/C Engines

A37 ABS & ABS/TCS Control Module

A14 Blower Motor and A/C Compressor

S220 Stop Lamp, plus Torque Converter Clutch and

Cruise Control Release

201 Body Wiring Harness to Main Wiring

Harness

52 Wheel Speed Sensor – Front

76 Wheel Speed Sensor – Rear

CHART A1 – ABS WARNING DISPLAY INOPERATIVE

Figure 5B-106

CIRCUIT DESCRIPTION:

Batter y voltage is supplied to the ABS O FF warning d ispla y with the ign ition switc h in the IGN or ST ART pos itions,

via the ignition control relay (R21) and through fuse F13 (located in the interior electrical centre).

The warning display can only be activated by the ABS or ABS/TCS control module A37 internally by supplying a

ground to terminal X1-21 or via the shorting bar in the ABS or ABS/TCS control m odule connector A37 when it is

disconnected from the control module.

TEST DESCRIPTION:

The numbers below refer to step numbers in diagnostic chart A1.

1. This test checks for any DTCs that may cause the ABS warning display to be inopera tive.

2. This test verifies an inoperative warning display condition.

3. This test checks each of the circuit protection devices.

4. This test checks if fault is within control module. Connector shorting pins in connector A37-X1 should cause

warning displa y to be activated.

5. This test checks for a faulty voltage supply to the instruments.

6. Checks circuit 300 (Orange wire).

7. Checks continuity through ignition control relay, R21.

8. Checks circuit 875 (Green wire).

9. Checks the warning display ground circuit to the ABS or ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. Refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2 Series Service Information for

procedures on checking wiring faults.

A37 P3

Figure 5B-107

CHART A1 - ABS WARNING DISPLAY INOPERATIVE

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / Diagnostic Trouble Codes / Read DTCs

(refer to NOTE 1 above).

Are any DTCs set?

Repair conditi ons

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. Disconnect Tech 2 from DLC.

2. Turn ignition on while observing ABS warning

display.

Is warning display visible for approximately 2 seconds

then turn off?

NOTE: If battery voltage is below 9 Volts, display may

stay on.

No fault found.

Go to Step 1 Go to Step 4

4. 1. Check fusible link F105 and fuses F10 and F13.

Does continuity exist through each?

Go to Step 5 Replace as

required.

5. 1. Turn ignition off.

2. Disconnect ABS or ABS/TCS control module

connector A37 from control module.

3. Turn ignition on.

Is ABS warning display visible?

Check control

module

connector A37

X1 terminals for

correct sizing &

condition. If OK,

replace control

module.

Go to Step 6

6. 1. With instrument cluster removed, switch ignition on

and measure voltage between connector P3,

terminal X1-20, circuit 539 (Pink/Blue wire) and

ground (refer to ‘Notes on Diagnostic Chart’, No. 2

above).

Is voltage as specified?

Battery + Go to Step 9 Go to Step 7

7. 1. Check wiring between ignition switch connector

S149, terminal X1-3, circuit 300 (Orange wire) and

interior electrical centre connector X129, terminal

X35-85 (ignition control relay R21) refer to ‘Notes on

Diagnostic Chart’, No. 2 above).

Does continu ity ex ist?

Go to Step 8 Check and repair

open in circuit

300, recheck and

verify repair.

8. 1. With the ignition switched on, check voltage from

interior electrical centre connector X129, terminal

X35-86 (ignition control relay R21) and a sound

ground.

Is voltage as specified ?

Battery + Go to Step 9 Replace ignition

control relay,

recheck and

verify repair.

9. 1. Check for continuity between instrument cluster

connector P3, term inal X1-14 and ABS or ABS/TCS

control module connector A37, terminal X1-21,

circuit 875 (Green wire) (refer to ‘Notes on

Diagnostic Chart’, No. 2 above).

Does continuity exist ?

Go to Step 10 Check and repair

open in circuit

875, recheck and

verify repair.

10. 1. Check for continuity between ground location GP2

(RH inner fender) and ABS or ABS/TCS control

module connector A37, terminal X1-19, circuit 150

(Black wire) (refer ‘Notes on Diagnostic Chart’, No. 2

above).

Ground circuit OK?

Replace

instrument

cluster, refer

Section 12C

INSTRUMENTS

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART A2 – TRAC OFF WARNING DISPLAY INOPERATIVE

Figure 5B-108

CIRCUIT DESCRIPTION:

Batter y vol tag e is supp l ied t o the TRAC OF F warn ing d is play with t he ig n ition switc h in t he IGN or START pos itions

through fuse F13 (located in the inter ior electrical centre). T he instrument cluster m onitors circuit 1061 for a serial

data mes sage from the AB S/TCS contro l module. If th e instrum ent cluster does n ot receive a ser ial data m essage

from the ABS/TCS control module, the instrument cluster will activate the TRAC OFF warning display.

The TRAC OFF warning display will be activated whenever the system is disabled; either manually through the

TRAC CTRL switch or du e to a f ault be ing l ogg ed i n th e contr ol module. When activated, the purp os e of the dis play

is to alert the driver that the TCS system has been disabled.

TEST DESCRIPTION:

The numbers below refer to step numbers in diagnostic chart A2.

1. This test checks for any DTCs that may cause the TRAC OFF warning display to be inoperative.

2. This test determines if the ABS/TCS control module is faulty by using Tech 2 to drive the warning display on.

3. This is a simple test to determine if power is being supplied to the instrument cluster warning displays (the

TRAC OFF and ABS warning displays share a common power source).

4. This step determines if the warning display is defective.

5. This test checks for a faulty voltage supply to the warning display.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7, TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. Refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2 Series Service Information for

procedures on checking wiring faults.

DIAGNOSTIC AIDS:

If the TRAC CTRL button is depressed and held for ten or more seconds (or there is a short to ground in circuit

1429), the ABS/TCS control module will see this as a short circuit to ground and the TCS will be permanently

enabled and the TRAC OFF warning display deactivated until the ignition is switched off and the engine restarted.

A37 P3

Figure 5B-109

CHART A2 - TRAC OFF WARNING DISPLAY INOPERATIVE

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / Diagnostic Trouble

Codes / Read DTCs (refer to NOTE 1 above).

Are any DTCs set?

Repair conditions

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. With Tech 2 still connected, exit Chassis and select

Body / Instruments / Miscellaneous Tests / Status

Indicators / Traction Control and command the

traction display ON and OFF.

Does the display change from ON to OFF when

commanded?

Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Go to Step 4

4. 1. Disconnect Tech 2 from DLC.

2. Turn ignition ON while observing the Instrument,

Multi Function Display (MFD).

Does the Instrument MFD display “System Check OK!”?

No fault found.

Go to Step 1 Go to Step 5

5. 1. Check fusible link F105 and fuses F10 and F13.

Does continuity exist through each? Go to Step 5 Replace

defective parts.

Go to Step 1.

6. 1. Remove instrument cluster, refer to 12C

INSTRUMENTS.

2. Switch ignition on and measure voltage between

connector P3, terminal X1-20, circuit 539 (Pink/Blue

wire) and ground (refer to Notes on Diagnostic Chart

No. 2 above).

Is voltage as specified?

Battery + Go to Step 9 Go to Step 7

7. 1. Check wiring between ignition switch connector

S149, terminal X1-3, circuit 300 (Orange wire) and

interior electrical centre connector X129, terminal

X34-85 (relay R20) refer to Notes on Diagnostic

Chart No. 2 above).

Does continu ity ex ist?

Go to Step 8 Check and repair

open in circuit

300, recheck and

verify repair.

8. 1. With the ignition switched on, check voltage from

interior electrical centre connector X129, terminal

X34-86 (relay R20) and a sound ground.

Is voltage as specified ?

Battery + Go to Step 9 Replace relay,

recheck and

verify repair.

9. 1. Check for continuity between instrument cluster

connector P3, term inal X1-24 and ABS or ABS/TCS

control module connector A37, terminal X1-20,

circuit 832 (Yellow/Red wire) (refer to Notes on

Diagnostic Chart No. 2 above).

Does continuity exist ?

Go to Step 10 Check and repair

open in circuit

875, recheck and

verify repair.

10. 1. Check for continuity between ground location E3

(RH inner fender) and ABS or ABS/TCS control

module connector A37, terminal X1-19, circuit 150

(Black wire) (refer to Notes on Diagnos tic Chart No.

2 above).

Ground circuit OK?

Replace

instrument

cluster, refer

Section 12C

INSTRUMENTS.

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART A3 - LOW TRAC WARNING DISPLAY INOPERATIVE

Figure 5B-110

CIRCUIT DESCRIPTION:

Battery voltage is supplied to the LOW TRAC warning display with the ignition switch in the IGN or START

positions through fuse F13 (located in the interior electrical centre).

The warning display is activated by the ABS/TCS control module internally by supplying ground to terminal X1-20

when the tr ac t ion control s ys tem (T CS) is ac tivated, or vi a a s hort ing b ar i n t he A B S/T CS c ontr ol module c o nn ec tor

A37, when it is disconnected from the control module.

TEST DESCRIPTION:

The numbers below refer to step numbers in diagnostic chart A3.

1. This test checks for any DTCs that may cause the LOW TRAC warning display to be inopera tive.

2. This test verifies an inoperative warning display condition.

3. This test checks if fault is within control module.

4. This step determines if the warning display bulb or socket is defective.

5. This test checks for a faulty voltage supply to the warning display.

6. Checks circuit 88.

7. Checks the warning displays ground circuit to the ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. Refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2 Series Service Information for

procedures on checking wiring faults.

A37 P3

Figure 5B-111

CHART A3 - LOW TRAC WARNING DISPLAY INOPERATIVE

STEP ACTION VALUE

YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC select Diagnostics / Chassis /

Diagnostic Trouble Codes / Read DTCs (refer to

NOTE 1 above).

Are any DTCs set ?

Repair conditi ons

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. Disconnect Tech 2 from DLC.

2. Turn ignition on whilst observing the Instrument

Multi Function Display (MFD).

Does the Instrument MFD display “System Check OK!”?

No fault found.

Go to Step 1 Go to Step 4

4. 1. Turn ignition OFF.

2. Disconnect ABS/TCS control module connector A37

from control mod ule.

3. Turn ignition ON.

Does “TC LOW” warning display activate in the

Check ABS/TCS

control modu le

connector

terminal for

correct sizing &

condition. If all

OK, replace

control modu le.

Go to Step 5

5. 1. Check fusible link F105 and fuses F10 and F13.

Does continuity exist through each?

Go to Step 6 –

6. 1. Remove instrument cluster, refer to 12C

INSTRUMENTS.

2. Switch ignition ON and measure voltage between

connector S149, terminal X1-3, circuit 300 (Orange

wire) and ground (refer NOTE 2 above).

Is voltage as specified ?

3. With instrument cluster removed, switch ignition on

and measure voltage between connector P3,

terminal X1-20, circuit 539 (Pink/Blue wire) and

ground (refer to Note 2 above).

Is voltage as specified?

Battery + Go to Step 7 Check fusible link

F105 and fuse

F13. Check

wiring betwe en

ignition sw itch

and instrument

cluster

connectors S149

and P3. Check

ignition sw itch

contacts, recheck

circuit to verify

repair.

7. 1. Check for continuity between instrument cluster

connector P3, terminal X1-24 and ABS/TCS control

module connector A37, terminal X1-20, circuit 832

(Yellow/Red wire) (refer to Note 2 above).

Does continuity exist ?

Go to Step 8 Check and repair

open in circuit

832, recheck and

verify repair.

8. 1. Check for continuity between ground location X157-

G2 (RH inner fender) and ABS/TCS control module

connector A37, terminal X1-19, circuit 150 (Black

wire) (refer to NOTE 2 above).

Ground circuit OK?

Replace

instrument

cluster, refer

Section 12C

INSTRUMENTS.

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART B - POWER SUPPLY TO CONTROL MODULE (NO DTCs STORED)

Figure 5B-112

CIRCUIT DESCRIPTION:

Battery voltage is supplied to the ABS or ABS/TCS control module terminal X1-15 with the ignition switch in the

IGN or START positions, via ignition control relay R21 and fuse F27 (both located in the interior electrical centre).

TEST DESCRIPTION:

The numbers below refer to the number/s in diagnostic chart B.

1. This test checks that there is sufficient battery voltage supply available.

2. This test checks the voltage supply to the ABS or ABS/TCS control module.

3. This test checks all fuses in the supply circuit.

4. This tests for open circuits in either of the power supply circuits.

5. Checks for soundness of the ignition switch internal contacts

6. Checks for an open circuit in circuit 300.

7. Checks the ground circuit and connections for the ignition control relay.

8. Checks the soundness of the relay switching, when activated.

9. Checks for an open circuit in circuits 3 and 839, including fuse F27.

10. This test checks the ground connections to the ABS or ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2 Series Service Information for

procedures on checking wiring faults.

A37

Figure 5B-113

CHART B - POWER SUPPLY TO CONTROL MODULE (NO DTCs STORED)

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Measure voltage across battery terminals.

Is it voltage as specified ? 10 – 16 Volts Go to Step 3 Check battery

condition. Refer

to 12A BATTERY

AND CABLES.

Check charging

system, refer to

6D1-1 (V6),

6D2- 1 (V6 S/C)

or 6D3-1 (GEN III

V8).

3. 1. Rem ove wiring harness connector A37 from ABS or

ABS/TCS control module.

2. Switch ignition ON.

3. Measure voltage at connector A37, terminal X1-15,

circuit 839 (Red wire).

Is voltage as specified ?

Approx.

12 Volts Go to Step 11 Go to Step 4

4. 1. Check fusible link F105 and fuses F10 and F27.

Are fusible link and fuses OK? Go to Step 5 Replace

defective fusible

link F105 and/or

fuses F10/F27.

Investigate cau se

of blown link or

fuse, recheck

circuit to verify

repair.

5. 1. Check wiring in circuits 342 (Red wire) to the ignition

control relay R21, terminal X35-30 and 1640

(Red/White wire) to the ignition switch S149,

terminal X1-1 for an open circuit.

Are both circuits OK?

Go to Step 6 Repair/replace

wiring as

necessary,

recheck circuit to

verify repair.

6. 1. Check ignition switch contacts by checking voltage

at ignition switch S149, terminal X1-3 and a sound

ground, with the ignition switched ON.

Is the voltage as specified?

Approx.

12 Volts Go to Step 7 Replace ignition

switch and verify

repair.

7. 1. Check wiring in circuit 300 (Orange wire) between

the ignition switch S149, terminal X1-3 and the

ignition control relay R21, terminal X3-86 for an

open circuit .

Is the circuit OK?

Go to Step 8 Repair/replace

wiring as

necessary,

recheck circuit to

verify repair.

8. 1. Check the resistance of circuit 150 (Black wire)

between the ignition control relay R21, terminal X35-

86 and the ground point X157_GP2, located at the

RHF inner fender.

Is the resistance as specified?

0 – 5 Ω Go to Step 9 Repair circuit as

required, recheck

circuit to verify

repair.

9. 1. With the ignition switched ON, use a DMM set to

volts and check between ignition relay R21, terminal

X35-87 and a sound ground point.

Is the voltage as specified?

Approx.

12 Volts Go to Step 10 Replace ignition

control relay R21,

recheck and

verify repair.

10. 1. Check wiring in circuit 3 (Pink wire) between the

ignition control relay R21, terminal X3-87 and A37,

terminal X1-15, for an open circuit.

Is the circuit OK?

Go to Step 11 Repair circuit as

required, recheck

circuit to verify

repair.

11. 1. Check for continuity between ABS or ABS/TCS

control module connector A37, terminal X1-19,

circuit 150 (Black wire) and the ground location

X157_GP2 (RH inner fender).

Is the ground circuit OK ?

Check ABS or

ABS/TCS control

module

connector A37

terminals for

correct sizing &

condition.

If all OK, replace

control modu le.

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART C1 – ABS ‘OFF’ WARNING DISPLAY ACTIVATED CONTINUOUSLY - (NO DTCs STORED)

Figure 5B-114

CIRCUIT DESCRIPTION:

Batter y volta ge is suppl ied to the A BS OFF warni ng displa y with the i gnition sw itch in the IGN or START pos itions

through f use F13 ( locat ed in the inter ior el ectric al ce ntr e). T he warning disp la y can only be acti vated b y the ABS or

ABS/TCS control module internally by supplying ground to terminal X1-21 or via the shorting bar in the ABS or

ABS/TCS control module connector A37 when it is disconnected from the control module.

TEST DESCRIPTION:

The numbers below refer to the Step numbers in diagnostic chart C1.

1. Uses Tech 2 to check for logged DTCs that are causing the warning display to activate.

2. This test checks whether the fault is caused by the ABS or ABS/TCS control module or a short to ground on

circuit 875 (Green wire).

3. This test checks for a short to ground in the wiring between the instrument cluster and the ABS or ABS/TCS

control module.

NOTES ON DIAGNOSTIC CHART:

4. Using a plastic lever (1), hold shorting bar (2)

away from terminals in connector A37, as

shown.

5. Refer to 4.7 TECH 2 DIAGNOSTICS in this

Section for connecting and using Tech 2.

6. Refer to Section 12P WIRING DIAGRAMS in

the MY 2003 VY and V2 Series Service

Information for procedures on checking wiring

faults.

Figure 5B-115

A37 P3

Figure 5B-116

CHART C1 – ABS WARNING DISPLAY ACTIVATED CONTINUOUSLY (NO DTCs STORED)

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / Diagnostic Trouble

Codes / Read DTCs (refer to NOTE 1 above).

Are any DTCs set ?

Repair conditi ons

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. Disconnect Tech 2 from DLC.

2. Remove wiring harness connector A37 from ABS or

ABS/TCS control module.

3. Hold shorting bar away from terminals X1-20 and

X1-21 in connector A37 (refer to NOTE 1 above).

4. Switch ignition ON.

Is the warning display constantly activated ?

Go to Step 4 Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

4. 1. Check circuit 875 (Green wire) and the instrument

cluster P3 for short to ground between the ABS or

ABS/TCS control module connector A37, terminal

X1-21 (Green wire) and connector P3, terminal X1-

14 (Green wire) (refer to NOTE 3 above).

Is all OK?

Replace

instrument

cluster, refer to

Section 12C

INSTRUMENTS.

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART C2 - TRAC OFF WARNING DISPLAY ACTIVATED CONTINUOUSLY – (NO DTCs STORED)

Figure 5B-117

CIRCUIT DESCRIPTION:

Battery voltage is supplied to the TRAC OFF warning display with the ignition switch in the 'IGN' or 'START'

positions thro ugh f use F13 ( located in t he pa ssenger com par tment f use panel) . The warning disp la y is act ivated b y

the ABS/T CS c ontrol m odule send ing a s ignal to t he in str ument clus ter via the s er ial data b us. T he warnin g dis pla y

will be activated whenever the system becomes disabled either because of a fault in the system or from being

manually turned off by the Traction Control (T/C) switch, located near the transmission shift selector.

TEST DESCRIPTION:

The numbers below refer to the Step numbers in diagnostic chart C2.

1. Uses Tech 2 to check for logged DTCs that are causing the warning display to activate.

2. Checks whether the fault is within the instrument cluster or ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7, TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

DIAGNOSTIC AIDS:

If the T/C button is depressed and held for ten or more seconds (or there is a short to ground in circuit 1571) the

ABS/T CS c ontr ol modul e wil l s ee th is as a s hor t c ir cuit to groun d a nd the TCS will be per manentl y ena bl ed a nd t he

TRAC OFF warning display deactivated until the ignition is switched off and the engine restarted.

Theref ore, a short c ircuit in circuit 1 571, inclu ding T /C switch will not activa te the warning displ ay cont inuousl y, but

it could cause the display to activate for ten seconds after the ignition is switched on.

CHART C2 - TRAC OFF WARNING DISPLAY ACTIVATED CONTINUOUSLY (NO DTCS STORED)

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / Diagnostic Trouble

Codes / Read DTCs (refer to NOTE 1 above).

Are any DTCs set ?

Repair conditi ons

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. With Tech 2 still connected, exit Chassis and select

Body / Instruments / Miscellaneous Tests / Status

Indicators / Traction Control and command the

traction display ON and OFF.

Does the display change from ON to OFF when

commanded?

Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Replace

instrument

cluster, refer to

Section 12C

INSTRUMENTS.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

CHART C3 – LOW TRAC WARNING DISPLAY ACTIVATED CONTINUOUSLY – (NO DTCs STORED)

Figure 5B-118

CIRCUIT DESCRIPTION:

Battery voltage is supplied to the LOW TRAC warning display with the ignition switch in the IGN or START

positions through fuse F13 (located in the interior electrical centre) and circuit 539 (Pink/Blue wire). The warning

displa y can only be acti vate d b y the A BS or ABS /TCS c ontrol module i nter n all y b y supplying grou nd to ter minal X 1-

20 or via the shorting bar in the ABS or ABS/TCS control module connector A3 7 when it is disconnected from the

control m odule. If the ABS or ABS/T CS control m odule activates traction control, it will send a signa l to the cruise

control module A18, via circuit 86 (Brown wire), requesting the cruise control module to turn off.

TEST DESCRIPTION:

The numbers below refer to the Step numbers in diagnostic chart C3.

1. Uses Tech 2 to check for logged DTCs that are causing the warning display to activate.

2. This test checks whether the fault is caused by the ABS or ABS/TCS control module.

3. This test checks ci rcuit 96, including stop display switch B.

4. This test checks for a short to ground in the wiring between the warning display, ABS or ABS/TCS control

module and the stop display switch connector.

NOTES ON DIAGNOSTIC CHART:

1. Using a plastic lever (1), hold shorting bar (2)

away from terminals in connector A37, as

shown.

2. Refer to 4.7, TECH 2 DIAGNOSTICS in this

Section for connecting and using Tech 2.

3. Refer to Section 12P WIRING DIAGRAMS in

the MY 2003 VY and V2 Series Service

Information for procedures on checking wiring

faults.

Figure 5B-119

A37 S220 X2 P3

Figure 5B-120

CHART C3 - LOW TRAC WARNING DISPLAY ACTIVATED CONTINUOUSLY (NO DTCs STORED)

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / Diagnostic Trouble

Codes / Read DTCs (refer to NOTE 2 above).

Are any DTCs set?

Repair conditions

which set DTCs,

recheck and

verify repair.

Go to Step 3

3. 1. Disconnect Tech 2 from DLC.

2. Remove wiring harness connector A37 from ABS or

ABS/TCS control module.

3. Hold shorting bar away from terminals X1-19 and

X1-20 in connector A37 (refer to NOTE 1 above).

4. Switch ignition ON.

Is the warning display constantly activated?

Go to Step 4 Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

4. 1. With connector A37 moved from the ABS or

ABS/TCS control module and the shorting bars held

away from terminals X1-19 and X1-20 in connector

A37, disconnect the stop lamp switch connector

S220 X2 (refer NOTE 1 above).

2. Switch ignition ON.

Is the warning display constantly activated?

Go to Step 5 Check for short

to ground in

circuit 86 and/or

check and adju st

or repair stop

display switch B,

as necessary

(refer to

Section 12B

LIGHTING

SYSTEM.

5. 1. Check circuit 832 (Yellow/Red wire) for short to

ground between the ABS or ABS/TCS control

module connector A37, terminal X1-20 and

connector P3, terminal X1-24 and stop lamp

connector S220 X2 (Yellow/Red wire) (refer NOTE 3

above).

Is all OK?

Replace

instrument

cluster, refer to

Section 12C

INSTRUMENTS.

Repair circuit as

required, recheck

circuit to verify

repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 21 - FRONT RIGHT WHEEL SPEED SENSOR INCORRECT SIGNAL

Figure 5B-121

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel inside the front hub ass embly generates a volt age pulse as it m oves past the whee l

speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 21 will set if vehicle speed is approximately 12 km/h and the control module detects a low right hand front

wheel speed sensor output voltage.

If a failure is detected which causes DTC 21 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 21 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 21.

1. This test checks if there is a speed signal o utput from the sensor.

2. This test checks for connector or wiring problems which may cause an intermittent condition.

3. This test determines whether the DTC was set by an intermittent condition or a control module fault.

4. This check is a visual inspection of the speed sensor, wiring and the pulse ring.

5. If repairs are necessary, the speed sensor output must be rechecked to verify the repair.

6. This test checks for a voltage drop in the wheel speed sensor wiring which could cause lower than specified

sensor output voltage.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

For additional information on testing the front wheel speed sensor, refer to 3.3 FRONT WHEEL SPEED SENSOR

LEAD in this Section.

B52 R

Figure 5B-122

DTC 21 – FRONT RIGHT WHEEL SPEED SENSOR INCORRECT SIGNAL

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Jack up front of vehicle and support on safety

stands. Refer to Section 0A GENERAL

INFORMATION in the MY 2003 VY and V2 Series

Service Information, for the location of jacking and

support points.

2. Install Tech 2 to DLC.

3. Select Diagnostics / Chassis / ABS/TCS/ Data List /

Active ABS (refer to NOTE 1 above).

4. Check right hand front wheel speed sensor output

signal by rotating wheel by hand.

(Alternatively, connect an oscilloscope (Tech 31) to

the wheel speed sensor connector B52 R, between

circuit 872 (White wire) and circuit 833 (Red wire),

rotate right hand front wheel by hand and compare

oscilloscope patterns with those shown below.

Repair as necessary or go to Step 2).

Does speed signal change as wheel is turned faster?

Go to Step 3 Go to Step 5

3. 1. Visually inspect sensor lead wiring and connections.

2. Check wiring for intermittent open or short circuit

(refer to NOTE 2 above).

Is all OK?

Go to Step 4 Repair fault with

sensor lead

wiring o r

connections,

recheck circuit to

verify repair.

4. 1. Clear all stored DTCs (refer to NOTE 1 above) and

road test vehicle .

Does DTC 21 set again?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

5. 1. Visually inspect sensor lead wiring, mountings and

connections.

Is all OK?

Go to Step 7 Go to Step 6

6. 1. Make repairs as necessary. Retest speed sensor

output.

Is output now OK?

Go to Step 4 Go to Step 7

7. 1. Check circuits 872 (White wire) and 833 (Red wire)

for continuity (refer to NOTE 2 above).

2. Inspect Main Wiring Harness to sensor lead

connector B52 R and sensor connector at front

wheel hub assembly.

Are connectors and wiring OK?

Replace front

hub & wheel

speed sensor

assembly, refer

to 3.3 WHEEL

SPEED

SENSOR in this

Section, recheck

circuit to verify

repair.

Repair wiring as

necessary,

recheck circuit to

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

OSCILLOSCOPE PATTERNS (SIMULATED ONLY)

Normal view Possibl e inc reasi ng and decreas i ng dist ance

between wheel speed sensor and pulse ring Possible chipped or damaged teeth

DTC 23 - FRONT RIGHT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

Figure 5B-123

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel inside the front hub ass embly generates a volt age pulse as it m oves past the whee l

speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 23 will s et when t he ig nition is switc hed on an d the c ontrol m odule detec ts a continuity pro blem in cir cuits 872

and 833, or no wheel speed signal is generated by the sensor.

If a failure is detected which causes DTC 23 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 23 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 23.

1. Begin rectification of this DTC by visually inspecting right hand front wheel speed sensor wiring for a fault

condition.

2. This test is a usual check for connector or wiring problems which may cause an intermittent condition.

3. This test checks for correct resistance reading of the sensor coil .

4. This test checks for continuity of right hand front wheel speed sensor wiring.

5. This test checks for short circuit between wheel speed sensor wi ring.

6. This test checks for open circuit in right hand front wheel speed sensor wiring.

7. This test checks for short to ground or B+ in circuits 872 and 833.

8. This test determines whether the DTC was set by an intermittent condition or a control module fault.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

For additional information on testing the front wheel speed sensor, refer to 3.3 FRONT WHEEL SPEED SENSOR

LEAD in this Section.

A37 B52 R

Figure 5B-124

DTC 23 - FRONT RIGHT WHEEL SPEED SENSOR SHORT CIRCUIT OR OPEN CIRCUIT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Ensure that right hand front wheel speed sensor

lead is not visibly damaged and that it is properly

secured at all places.

2. If the sensor lead is damaged or not correctly

mounted and retained, replace the lead and/or

properly install it.

3. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

Road test vehicle, does DTC 23 set again ?

Go to Step 4 Go to Step 3

3. 1. Inspect all system wiring and connections that could

ca us e s in te rm it t e n t fa ul t s . Ch ec k al l wi r in g is in go od

condition, terminals are clean and tight and making

good contact (refer to NOTE 2 above).

Is all OK?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

Make repairs as

necessary,

recheck circuit to

verify repair.

4. 1. Turn ignition OFF.

2. Disconnect sensor lead connector B52 R from Main

Wiring Harness connector.

3. Using digital multimeter, measure sensor and lead

resistance.

Is value as specified?

1,300

Ohms Go to Step 6 Go to Step 5

5. 1. Remove sensor lead and check continuity of lead

wiring.

Is continuity OK?

Wheel speed

sensor faulty.

Replace front

hub assembly,

refer to 3 FRONT

SUSPENSION.

Recheck circuit

to verify repair.

Replace faulty

lead. Refer to 3.3

FRONT WHEEL

SPEED

SENSOR LEAD

in this Section,

recheck circuit to

verify repair.

6. 1. Disconnect the ABS or ABS/TCS control module

connector A37.

2. With sensor lead connector B52 R still

disconnected, check continuity between ABS or

ABS/TCS control module connector A37, terminals

X1-4 and X1-5 (refer to NOTE 2 above).

Does continu ity ex ist?

Eliminate short

circuit in wiring

between circ uits

872 (White wire)

and 833 (Red

wire), recheck

circuit to verify

repair.

Go to Step 7

7. 1. Check circuits 872 (White wire) and 833 (Red wire)

for open circuit between sensor connector B52 R

and ABS or ABS/TCS control module connector A37

(refer to NOTE 2 above).

Is there continuity in both circuits ?

Go to Step 8 Eliminate open

circuit in wiring,

recheck circuit to

verify repair.

8. 1. Check circuits 872 and 833 for short to ground or B+

(refer to NOTE 2 above).

Are both circuits OK ?

Go to Step 9 Eliminate short to

ground or B+ in

wiring, recheck

circuit to verify

repair.

(Approx.)

STEP ACTION VALUE YES NO

9. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 23 set again?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 25 - FRONT LEFT WHEEL SPEED SENSOR INCORRECT SIGNAL

Figure 5B-125

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel inside the front hub ass embly generates a volt age pulse as it m oves past the whee l

speed sensor; each tooth - gap - tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 25 will set if vehicle speed is approximately 12 km/h and the control module detects a low left hand front

wheel speed sensor output voltage.

If a failure is detected which causes DTC 25 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS, or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 25 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 25.

1. This test checks if there is a speed signal o utput from the sensor.

2. This test checks for connector or wiring problems which may cause an intermittent condition.

3. This test determines whether the DTC was set by an intermittent condition or a control module fault.

4. This check is a visual inspection of the speed sensor, wiring and the pulse ring.

5. If repairs are necessary, the speed sensor output must be rechecked to verify the repair.

6. This test checks for a voltage drop in the wheel speed sensor wiring which could cause lower than specified

sensor output voltage.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

For additional information on testing the front wheel speed sensor, refer to 3.3 FRONT WHEEL SPEED SENSOR

LEAD in this Section.

B52_L

Figure 5B-126

DTC 25 - FRONT LEFT WHEEL SPEED SENSOR INCORRECT SIGNAL

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Jack up front of vehicle and support on safety

stands. Refer to Section 0A GENERAL

INFORMATION in the MY 2003 VY and V2 Series

Service Information, for the location of jacking and

support points.

2. Install Tech 2 to DLC.

3. Select Diagnostics / Chas sis / ABS/TCS / Data List /

Active ABS (refer to NOTE 1 above).

4. Check left hand front wheel speed sensor output

signal by rotating wheel by hand.

(Alternatively, connect an oscilloscope (Tech 31) to

the wheel speed sensor connector B52 L, between

circuit 830 (Brown wire) and circuit 873 (Grey wire),

rotate left hand front wheel by hand and compare

oscilloscope patterns with those shown below.

Repair as necessary or go to Step 2).

Does speed signal change as wheel is turned faster?

Go to Step 3 Go to Step 5

3. 1. Visually inspect sensor lead wiring and connections.

2. Check wiring for intermittent open or short circuit

(refer to NOTE 2 above).

Is all OK ?

Go to Step 4 Repair fault with

sensor lead

wiring o r

connections,

recheck circuit to

verify repair.

4. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 25 set again ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

5. 1. Visually inspect sensor lead wiring, mountings and

connections.

Is all OK?

Go to Step 7 Go to Step 6

6. 1. Make repairs as necessary. Retest speed sensor

output.

Is output now OK ?

Go to Step 4 Go to Step 7

7. 1. Check circuits 830 (Brown wi re) and 873 (Grey wi re)

for continuity (refer to NOTE 2 above).

2. Inspect Main Wiring Harness to sensor lead

connector and sensor connector B52 L at front

wheel hub assembly.

Are connectors and wiring OK ?

Replace front

hub & wheel

speed sensor

assembly, refer

to Section 3.

FRONT

SUSPENSION.

Recheck circuit

to verify repair.

Repair wiring as

necessary,

recheck circuit to

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

OSCILLOSCOPE PATTERNS (SIMULATED ONLY)

Normal view Possibl e inc reasi ng and decreas i ng dist ance

between wheel speed sensor and pulse ring Possible chipped or damaged teeth

DTC 27 – FRONT LEFT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

Figure 5B-127

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel inside the front hub ass embly generates a volt age pulse as it m oves past the whee l

speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 27 will s et when t he ig nition is switc hed on an d the c ontrol m odule detec ts a continuity pro blem in cir cuits 830

and 873, or no wheel speed signal is generated by the sensor.

If a failure is detected which causes DTC 27 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 27 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 27.

1. Begin rectification of this DTC by visually inspecting left hand front wheel speed sensor wiring for a fault

condition.

2. This test checks for connector or wiring problems which may cause an intermittent condition.

3. This test checks for correct resistance reading of the sensor coil .

4. This test checks for continuity of left hand front wheel speed sensor wiring.

5. This test checks for short circuit between wheel speed sensor wi ring.

6. This test checks for open circuit in left hand front wheel speed sensor wiring.

7. This test checks for short to ground or B+ in circuits 830 and 873.

8. This test determines whether the DTC was set by an intermittent condition or a control module fault.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

For additional information on testing the front wheel speed sensor, refer to 3.3 FRONT WHEEL SPEED SENSOR

LEAD in this Section.

A37 B52 L

Figure 5B-128

DTC 27 - FRONT LEFT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Ensure that left hand front wheel speed sensor lead

is not visibly damaged and that it is properly secured

at all places .

2. If the sensor lead is damaged or not correctly

mounted and retained, replace the lead and/or

properly install it.

3. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

Road test vehicle, does DTC 27 set again ?

Go to Step 4 Go to Step 3

3. 1. Inspect all system wiring and connections that could

cause intermittent faults. Check all wiring is in good

condition, terminals are clean and tight and making

good contact (refer to NOTE 2 above).

Is all OK ?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

Make repairs as

necessary,

recheck circuit to

verify repair.

4. 1. Turn ignition OFF.

2. Disconnect sensor lead connector B52 L from Main

Wiring Harness connector.

3. Using digital multimeter, measure sensor and lead

resistance.

Is value as specified ?

1,300

Ohms Go to Step 6 Go to Step 5

5. 1. Remove sensor lead and check continuity of lead

wiring.

Is continuity OK ?

Wheel speed

sensor faulty.

Replace front

hub assembly,

refer to 3 FRONT

SUSPENSION.

Recheck circuit

to verify repair.

Replace faulty

lead. Refer to 3.3

FRONT WHEEL

SPEED

SENSOR LEAD

in this Section,

recheck circuit to

verify repair.

6. 1. Disconnect ABS or ABS/TCS control module

connector A37.

2. With sensor lead connector B52 L still disconnected,

check continuity between ABS or ABS/TCS control

module connector A37, terminals X1-6 and X1-7

(refer NOTE 2 above).

Does continuity exist ?

Eliminate short

circuit in wiring

between circ uits

873 (Grey wire)

and 830 (Brown

wire), recheck

circuit to verify

repair.

Go to Step 7

7. 1. Check circuits 830 (Brown wi re) and 873 (Grey wi re)

for open circuit between sensor connector B52 L

and ABS or ABS/TCS control module connector A37

(refer NOTE 2 above).

Is there continuity in both circuits ?

Go to Step 8 Eliminate open

circuit in wiring,

recheck circuit to

verify repair.

8. 1. Check circuits 830 and 873 for short to ground or B+

(refer to NOTE 2 above).

Are both circuits OK ?

Go to Step 9 Eliminate short to

ground or B+ in

wiring, recheck

circuit to verify

repair.

(Approx.)

STEP ACTION VALUE YES NO

9. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 27 set again ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 28 - WHEEL SPEED SENSOR FREQUENCY ERROR

Figure 5B-129

CIRCUIT DESCRIPTION:

The toothed pulse ring generates a voltage pulse as it moves past the wheel speed sensor. Each tooth – gap –

tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed. The ABS

or ABS/TCS control module will calculate the wheel speed by the number of teeth on the pulse ring.

DTC 28 will set if an incorrect number of teeth or damaged teeth are present on a pulse ring. If the ABS or

ABS/TCS control module could define the specific wheel speed sensor causing the malfunction, the DTC

associated with the sensor (21, 25, 31 or 35) will be set instead of DTC 28.

If a failure is detected which causes DTC 28 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 28 will

be set.

NOTE: If DTC 28 s ets, the ABS or A BS/TCS contr ol modu le does not or c annot deter mine which s ensor ass em bly

is at fault. All the wheel speed sensors will need to be checked to determine which is setting the DTC.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 28.

1. Begin rectification of this DTC by visually inspecting both front wheel speed sensors wiring for a fault condition.

2. This test checks for any front wheel speed sensor wiring or connector problem that could cause DTC 28 to set.

3. This test checks tha t rear sensors are correctly installed.

4. This test checks that the rear wheel pulse rings are correctly mounted.

5. This test checks for any re ar wheel speed sensor wiring or connector problem that could cause DTC 28 to set.

B52 R & L A37 B76 R & L

Figure 5B-130

DTC 28 - WHEEL SPEED SENSOR FREQUENCY ERROR

STEP ACTION VALUE YES NO

FOR FRONT WHEEL SPEED SENSORS ONLY

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Visually inspect sensor lead wiring mountings and

connections.

Is all OK ?

Go to Step 3 Repair or replace

components as

necessary,

recheck circuit to

verify repair.

3. 1. Check system wiring for faults between ABS or

ABS/TCS control module connector A37 and front

wheel speed sensor lead connections at the front

wheel hub connections, B52 L and B52 R, as

detailed in steps 3 to 7 in diagnostic charts DTC 23

and/or DTC 27 in this Section.

Is all OK ?

Go to Step 4 Repair or replace

wiring as

necessary,

recheck circuit to

verify repair.

FOR REAR WHEEL SPEED SENSORS ONLY

4. 1. Check that the sensors are correctly mounted and

that the retaining bolt is tightened to the correct

torque specif ication.

Is all OK ?

Go to Step 5 Properly mount

and attach

sensor, recheck

circuit to verify

repair.

5. 1. Check that pulse ring is correctly mounted to inner

axle shaft and is in line with sensor.

Is all OK ?

Ensure that the

number of puls e

ring teeth

correspond to

specification (48),

and are not

damaged. If all

OK, go to Step 6.

Replace inner

axle shaft, refer

to 3.5 PULSE

RINGS in this

Section, recheck

circuit to verify

repair.

6. 1. Check system wiring for faults between ABS or

ABS/TCS control module connector A37 and rear

wheel speed sensor lead connectors B76 L and B76

R, as detailed in steps 3 to 6 in diagnostic charts

DTC 33 and/or DTC 37 in this Section.

Is all OK ?

Check all system

wiring harness

connector

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

Repair or replace

wiring as

necessary,

recheck circuit to

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 31 – REAR RIGHT WHEEL SPEED SENSOR INCORRECT SIGNAL

Figure 5B-131

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel on the inner right rear axle flange generates a voltage pulse as it moves past the

wheel speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 31 will set if vehicle speed is approximately 12 km/h and the control module detects a low right hand rear

wheel speed sensor output voltage.

If a failure is detected which causes DTC 31 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 31 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 31.

1. This test checks if there is a speed signal o utput from the sensor.

2. This test checks for connector or wiring problems which may cause an intermittent condition.

3. This test determines whether the DTC was set by an intermittent condition or a control module fault.

4. This check is a visual inspection of the speed sensor, wiring and the pulse ring.

5. If repairs are necessary, the speed sensor output must be rechecked to verify the repair.

6. This test checks for voltage drops in the wheel speed sensor wiring which could cause lower than specified

sensor output voltage.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

B76 R P3 X201

Figure 5B-132

DTC 31 - REAR RIGHT WHEEL SPEED SENSOR INCORRECT SIGNAL

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Raise rear of vehicle and support on safety stands.

Refer to 0A GENERAL INFORMATION in the MY

2003 VY and V2 Series Service Information, for the

location of jacking and support points.

2. Install Tech 2 to DLC (refer to NOTE 1 above).

3. Select Diagnostics / Chas sis / ABS/TCS / Data List /

Active ABS

4. Check right hand rear wheel speed sensor output

signal by rotating wheel by hand.

(Alternatively, connect an oscilloscope (Tech 31) to

the wheel speed sensor connector B76 R, between

circuit 882 (Black wire) and circuit 883 (Blue wire),

rotate right hand rear wheel by hand and compare

oscilloscope patterns with those shown below.

Repair as necessary or go to Step 2).

Does speed signal change as wheel is turned faster?

Go to Step 3 Go to Step 5

3. 1. Visually inspect sensor lead wiring and connections.

2. Check wiring for intermittent open or short circuit

(refer to NOTE 2 above).

Is all OK ?

Go to Step 4 Repair fault with

sensor lead

wiring or replace

sensor, recheck

circuit to verify

repair.

4. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 31 set again?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

5. 1. Visually inspect sensor end for any signs of

damage.

2. Check that the pulse ring is secured to the inner

axle shaft and is positioned in line with the sensor.

3. Inspect pulse ring teeth for any signs of damage.

Is all OK ?

Go to Step 7 Go to Step 6

6. 1. Make repairs as necessary. Retest speed sensor

output.

Is output now OK ?

Go to Step 4 Go to Step 7

7. 1. Check circuits 882 (Black wire) and 883 (Blue wire)

for continuity (refer to NOTE 2 above).

2. Inspect body harness to sensor connector B76 R,

body harness to Main Wiring Harness connector

X201 and ABS or ABS/TCS control module

connector A37.

Are connectors and wiring OK ?

Replace rear

wheel speed

sensor asm, refer

to 3.4 WHEEL

SPEED

SENSORS in this

Section. Recheck

circuit to verify

repair.

Repair wiring as

necessary,

recheck circuit to

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

OSCILLOSCOPE PATTERNS (SIMULATED ONLY)

Normal view Possibl e inc reasing and decreasing distance

between wheel speed sensor and pulse ring Possibl e chipped or damaged teeth

DTC 33 – REAR RIGHT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

Figure 5B-133

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel on the inner right rear axle flange generates a voltage pulse as it moves past the

wheel speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 33 will s et when t he ig nition is switc hed on an d the c ontrol m odule detec ts a continuity pro blem in cir cuits 882

and 883, or no wheel speed signal is generated by the sensor.

If a failure is detected which causes DTC 33 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 33 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 33.

2. Begin rectification of this DTC by visually inspecting right hand rear wheel speed sensor wiring for a fault

condition.

3. This test is a usual check for connector or wiring problems which may cause an intermittent condition.

4. This test checks for correct resista nce reading of the sensor coil.

5. This test checks for short circuit in right hand rear wheel speed sensor wiring.

6. This test checks for open circuit in right hand rear wheel speed sensor wiring.

7. This test checks for short to ground or B+ in circuits 882 a nd 883.

8. This test determines whether the DTC was set by an intermittent condition or a control module fault.

NOTES ON DIAGNOSTIC CHART:

9. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

10. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

B76 R P3 X201

Figure 5B-134

DTC 33 – REAR RIGHT WHEEL SPEED SENSOR SHORT CIRCUIT OR OPEN CIRCUIT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Ensure that right hand rear wheel speed sensor lead

is not visibly damaged and that it is properly secured

at all places .

2. If the sensor lead is damaged or not correctly

mounted and retained, replace the lead and/or

properly install it.

3. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

Road test vehicle; does DTC 33 set again ?

Go to Step 4 Go to Step 3

3. 1. Inspect all system wiring and connections that could

ca us e s in te rm it t e n t fa ul t s . Ch ec k al l wi r i ng is in go od

condition, terminals are clean and tight and making

good contact (refer to NOTE 2 above).

Is all OK ?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

Make repairs as

necessary,

recheck circuit to

verify repair.

4. 1. Turn ignition OFF.

2. Disconnect sensor lead connector B76 R from body

harness connec tor X 201.

3. Using digital multimeter, measure sensor and lead

resistance.

Is value as specified ?

1440 – 1760

Ohms Go to Step 5 Replace rear

wheel speed

sensor asm, refer

to 3.4 WHEEL

SPEED

SENSORS in this

Section. Recheck

circuit to verify

repair.

5. 1. Disconnect ABS or ABS/TCS control module

connector A37.

2. With sensor lead connector B76 R still

disconnected, check continuity between ABS or

ABS/TCS control module connector A37, terminals

X1-1 and X1-2 (refer to NOTE 2 above).

Does continuity exist ?

Eliminate short

circuit in wiring

between circ uits

882 (Black wire)

and 883 (Blue

wire), recheck

circuit to verify

repair.

Go to Step 6

6. 1. Check circuits 882 (Black wire) and 883 (Blue wire)

for open circuit between sensor connector B76 R

and ABS control module connector A37 (refer to

NOTE 2 above).

Is there continuity in both circuits ?

Go to Step 7 Eliminate open

circuit in wiring,

recheck circuit to

verify repair.

7. 1. Check circuits 882 and 883 for short to ground or B+

(refer to NOTE 2 above).

Are both circuits OK ?

Go to Step 8 Eliminate short to

ground or B+ in

wiring, recheck

circuit to verify

repair.

8. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 33 set again ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 35 - REAR LEFT WHEEL SPEED SENSOR INCORRECT SIGNAL

Figure 5B-135

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel on the inner left rear axle flange generates a voltage pulse as it moves past the wheel

speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 35 will s et if veh icle s p eed is a pprox imately 12 km/h and t he c ontrol module d etect s a lo w lef t han d r ear whee l

speed sensor output voltage.

If a failure is detected which causes DTC 35 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS, or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 35 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 35.

1. This test checks if there is a speed signal o utput from the sensor.

2. This test checks for connector or wiring problems which may cause an intermittent condition.

3. This test determines whether the DTC was set by an intermittent condition or a control module fault.

4. This check is a visual inspection of the speed sensor, wiring and the pulse ring.

5. If repairs are necessary, the speed sensor output must be rechecked to verify the repair.

6. This test checks for voltage drops in the wheel speed sensor wiring which could cause lower than specified

sensor output voltage.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

B76 R P3 X201

Figure 5B-136

DTC 35 - REAR LEFT WHEEL SPEED SENSOR INCORRECT SIGNAL

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Raise rear of vehicle and support on safety stands.

Refer to 0A GENERAL INFORMATION in the MY

2003 VY and V2 Series Service Information, for the

location of jacking and support points.

2. Install Tech 2 to DLC and turn ignition ON (refer to

NOTE 1 above).

3. Select Diagnostics / Chassis / ABS/TCS/ Data List /

Active ABS.

4. Check left hand rear wheel speed sensor output

signal by rotating wheel by hand.

5. Alternatively, connect an oscilloscope (Tech 31) to

the wheel speed sensor connector B76 L, between

circuit 884 (Purple w ire) and circuit 885 (Y ellow

wire), rotate left hand front wheel by hand and

compare oscilloscope patterns with those shown

below. Repair as necessary or go to Step 2).

Does speed signal change as wheel is turned faster?

Go to Step 3 Go to Step 5

3. 1. Visually inspect sensor lead wiring and connections.

2. Check wiring for intermittent open or short ci rcuit

(refer NOTE 2 above).

Is all OK ?

Go to Step 4 Repair fault with

sensor lead

wiring or replace

sensor, recheck

and verify repair.

4. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 35 set again ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

5. 1. Visually inspect sensor end for any signs of

damage.

2. Check that the pulse ring is secured to the inner

axle shaft and is positioned in line with the sensor.

3. Inspect pulse ring teeth for any signs of damage.

Is all OK ?

Go to Step 7 Go to Step 6

6. 1. Make repairs as necessary. Retest speed sensor

output.

Is output now OK ?

Go to Step 4 Go to Step 7

7. 1. Check circuits 884 (Purple wire) and 885 (Yellow

wire) for continuity (refer to NOTE 2 above).

2. Inspect body harness to sensor connector B76 L,

body harness to Main Wiring Harness connector

X201 and ABS or ABS/TCS control module

connector A37.

Are connectors and wiring OK ?

Replace rear

wheel speed

sensor, refer 3.4

W HEEL SPEED

SENSORS in this

Section. Recheck

and verify repair.

Repair wiring as

necessary,

recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

OSCILLOSCOPE PATTERNS (SIMULATED ONLY)

Normal view Possi bl e inc reasi ng and decreas i ng dist ance

between wheel speed sensor and pulse ring Possible chi pped or damaged teeth

DTC 37 - REAR LEFT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

Figure 5B-137

CIRCUIT DESCRIPTION:

The toothed pulse ring wheel on the inner left rear axle flange generates a voltage pulse as it moves past the wheel

speed sensor; each tooth – gap – tooth on the pulse ring generates these pulses.

The frequency of these pulses is used by the ABS or ABS/TCS control module to determine wheel speed.

DTC 37 will s et when t he ig nition is switc hed on an d the c ontrol m odule detec ts a continuity pro blem in cir cuits 884

and 885, or no wheel speed signal is generated by the sensor.

If a failure is detected which causes DTC 37 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS, or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 37 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 37.

1. Begin rectification of this DTC by visually inspecting left hand rear wheel speed sensor wiring for a fault

condition.

2. This test is a usual check for connector or wiring problems which may cause an intermittent condition.

3. This test checks for correct resistance reading of the sensor coil .

4. This test checks for continuity of left hand rear wheel speed sensor wiring.

5. This test checks for open circuit in left hand rear wheel speed sensor wiring.

6. This test checks for short to ground or B+ in circuits 884 and 885.

7. This test determines whether the DTC was set by an intermittent condition or a control module fault.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37 X201 B76_L

Figure 5B-138

DTC 37 - REAR LEFT WHEEL SPEED SENSOR SHORT OR OPEN CIRCUIT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Ensure that left hand rear wheel speed sensor lead

is not visibly damaged and that it is properly secured

at all places .

2. If the sensor lead is damaged or not correctly

mounted and retained, replace the lead and/or

properly install it.

3. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

Road test vehicle, does DTC 37 set again?

Go to Step 4 Go to Step 3

3. 1. Inspect all system wiring and connections that could

cause intermittent faults. Check all wiring is in good

condition, terminals are clean and tight and making

good contact (refer NOTE 2 above).

Is all OK?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

Make repairs as

necessary and

recheck circuit to

verify repair.

4. 1. Turn ignition OFF.

2. Disconnect sensor lead connector B76 L from body

harness connec tor X 201.

3. Using digital multimeter, measure sensor and lead

resistance.

Is value as specified?

1440 – 1760

Ohms Go to Step 5 Replace rear

wheel speed

sensor asm, refer

to 3.4 WHEEL

SPEED

SENSORS in this

Section, recheck

circuit to verify

repair.

5. 1. Disconnect ABS control module connector A37.

2. With sensor lead connector B76 L still disconnected,

check continuity between ABS or ABS/TCS control

module connector A37, terminals X1-8 and X1-9

(refer to NOTE 2 above).

Does continu ity ex ist?

Eliminate short

circuit in wiring

between circ uits

884 (Purple wire)

and 885 (Yellow

wire), recheck

circuit to verify

repair.

Go to Step 6

6. 1. Check circuits 884 (Purple wire) and 885 (Yellow

wire) for open circuit between sensor connector B76

L and ABS or ABS/TCS control module connector

A37 (refer to NOTE 2 above).

Is there continuity in both circuits?

Go to Step 7 Eliminate open

circuit in wiring,

recheck circuit to

verify repair.

7. 1. Check circuits 884 and 885 for short to ground or B+

(refer NOTE 2 above).

Are both circuits OK?

Go to Step 8 Eliminate short to

ground or B+ in

wiring, recheck

circuit to verify

repair.

8. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Clear DTCs and clear all DTCs (refer to NOTE 1

above).

2. Road test vehicle.

Does DTC 37 set again?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTCs: 41, 42, 45, 46, 47, 48, 51, 52, 55 & 56 – SOLENOID VALVE CIRCUIT FAULTS

Figure 5B-139

The components relating to these DTCs are all part of the hydraulic modulator assembly and share a common

ground and power supply.

• DTC 41 Front Right Inlet Valve Solenoid Fault

• DTC 42 Front Right Outlet Valve Solenoid Fault

• DTC 45 Front Left Inlet Valve Solenoid Fault

• DTC 46 Front left Outlet Valve Solenoid Fault

• DTC 47 Priming Valve Solenoid Fault (ABS/TCS Only)

• DTC 48 Switching Valve Solenoid Fault (ABS/TCS Only)

• DTC 51 Rear Right Inlet Valve Solenoid Fault (ABS/TCS Only)

• DTC 52 Rear Right Outlet Valve Solenoid Fault (ABS/TCS Only)

• DTC 55 Rear Left Inlet Valve Solenoid Fault (ABS/TCS Only) or Rear Axle Inlet Solenoid Valve Fault (ABS

Only)

• DTC 56 Rear Left Outlet Valve Solenoid Fault (ABS/TCS Only) or Rear Axle Outlet Valve Solenoid Fault (ABS

Only)

CIRCUIT DESCRIPTION:

The h ydraul ic modulator a n d c ontro l module as s embly ar e supplied with c o ns tant po wer f rom the battery via fusible

link F103 and, when the ignition is switched ON, via fuse F27. The solenoid valves are activated by the control

module internally supplying ground via terminals X1-16 and X1-19.

If the ABS or ABS/TCS control module senses a fault such as an open circuit or a short circuit in the wiring or

solenoid valve, the valve relay will be de-energised. The ABS, or ABS and TRAC OFF warning displays will be

activated and the relevant DTC/S will be set.

If a failure is detected which causes DTCs 41, 42, 45, 46, 47, 48, 51, 52, 55 or 56 to set, the ABS or ABS/TCS

system is disabled and the control module activates the ABS, or ABS and TRAC OFF warning displays for the

remainder of the ignition cycle. If the failure is intermittent, the control module will enable the system at the next

ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the following diagnostic chart.

3. T his step determ ines if there is a comm on power or ground s upply fault to t he hydraulic modulator and c ontrol

module assembly.

4. This test uses Tech 2 to check for proper solenoid valve operation.

5. Checks for constant battery voltage to the control module A37 at terminals X1-17 and X1-18.

6. Checks for battery voltage to the control module A37 at terminal X1-15 when the ignition is switched on.

7. Checks for continuity in ground circuit 350.

8. Checks for continuity in ground circuit 150.

NOTES ON DIAGNOSTIC CHART:

9. Refer to 4.7, TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

10. For all wiring checking procedures, refer to Section 12P, WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37

Figure 5B-140

DTCs 41, 42, 45, 46, 47, 48, 51, 52, 55 & 56 – SOLENOID VALVE CIRCUIT FAULTS

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Read DTCs (refer to NOTE 1 above).

Is there more than one DTC set ?

Go to Step 4 Go to Step 3

3. 1. With Tech 2 connected, select Diagnostics / Chassis

/ ABS/TCS / Miscellaneous Tests / Solenoids.

2. Depending on the DTC set, conduct the relevant

solenoid test (ie. if DTC 41 is set, select Front Right

Solenoid Valve Test) and conduct solenoid test

(refer to NOTE 1 above)

Does test confirm that relevant solenoid is OK ?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

ABS or ABS/TCS

control modu le

connector

terminals.

Replace

hydraulic

modulator asm,

refer to 3.5

HYDRAULIC

MODULATOR

AND CONTROL

MODULE

ASSEMBLY in

this Section.

4. 1. Turn ignition Off.

2. Disconnect contr ol mod ule connector A37.

3. Check for voltage at control module connector A37

terminals X1-17 and then X1-18, circuit 542 (Red

wire) to ground (refer to NOTE 2 above).

Is voltage as specified at each terminal?

Approx.

12 Volts Go to Step 5 Check and repair

open or short in

circuit 542,

recheck and

verify repair.

5. 1. Ignition ON.

2. With connector A37 still disconnected from control

module , check for voltage between terminal X1-15,

circuit 839 (Red wire) and ground (refer NOTE 2

above).

Is voltage as specified?

Approx.

12 Volts Go to Step 6 Check and repair

open or short in

circuit 839

(including fuse

F27), recheck

and verify repair.

6. 1. With control module connector A37 still

disconnected, check for continuity between control

module connector A37, terminal X1-16, circuit 350

(Black/Red wire) and ground location

X119_G3_GP3 (ABS bracket in engine

compartment).

Does continuity exist ?

Go to Step 7 Check and repair

open in circuit

350, recheck and

verify repair.

7. 1. With control module connector A37 still

disconnected, check for continuity between control

module connector A37, terminal X1-19, circuit 150

(Black wire) and ground location X157_GP2.

Does continuity exist ?

Replace

hydraulic

modulator asm,

refer to

3.5 HYDRAULIC

MODULATOR

AND CONTROL

MODULE ASM in

this Section.

Check and repair

open in circuit

150, recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 61 - PUMP MOTOR OR RELAY FAULT

Figure 5B-141

CIRCUIT DESCRIPTION:

When the pump motor relay is grounded by the ABS control module, it provides B+ to operate the modulator’s

return p ump. Onc e the pum p motor circuit is en ergis ed, a 'Pum p On' signa l is sent t o the AB S or AB S/TCS contr ol

module to verify pum p motor opera tio n.

DTC 61 will set if 12 vo lts is pres ent at the pum p motor wit hout relay acti vation, or if batter y voltage is not pres ent

at the pump motor when the relay is activated.

If the ABS or ABS/TCS control module senses a fault such as an open circuit or a short circuit in the wiring or pump

motor, the pump relay will be de-energised. The ABS or ABS and TRAC OFF warning displays will be activated

and the relevant DTC/S will be set.

If a failure is detected which causes DTC 61 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS, or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, the control module will enable the system at the next ignition cycle and the relevant history

DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 61.

1. T his step determ ines if there is a co mmon power or ground s upply fault t o the hydraulic modulator and c ontrol

module assembly.

2. This test uses Tech 2 to check for proper pump operation.

3. Inspection of hydraulic modulator motor connector.

4. Checks for constant battery voltage to the control module at terminals X1-17 and X1-18.

5. Checks for battery voltage to the control module A37 at terminal X1-15 when the ignition is switched on.

11. Checks for continuity in ground circuit 350.

12. Checks for continuity in ground circuit 150.

NOTES ON DIAGNOSTIC CHART:

13. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

14. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in MY 2003 VY and V2 Series

Service Information.

A37

Figure 5B-142

DTC 61 - PUMP MOTOR OR RELAY FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC and select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes /

Read DTCs (refer to NOTE 2 above).

Is DTC 61 the only DTC set ?

Go to Step 5 Go to Step 3

3. 1. With Tech 2 connected, Diagnostics / Chassis /

ABS/TCS / Miscellaneous Tests / Auto Test and

conduct test (refer to NOTE 2 above).

Does the pump motor run?

NOTE: The pump motor should be heard to run for

approximately 1 to 2 seconds while conducting test.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

Go to Step 4

4. 1. Check that the ground connection is sound and that

the female connector terminals have not been

distorted.

2. Inspect the hydraulic modulator pump motor

connector (located at the front of the modulator and

control module assembly, under control module

connector A37) to ensure it is firmly connected.

Are connections OK and the connector correctly

installed?

Replace

hydraulic

modulator asm,

refer to 3.5

HYDRAULIC

MODULATOR

AND CONTROL

MODULE

ASSEMBLY in

this Section.

Ensure secure

connection,

recheck and

verify repair.

5. 1. Turn ignition OFF.

2. Disconnect contr ol mod ule connector A37.

3. Check for voltage at control module connector A37,

terminals X1-17 and then X1-18, circuit 542 (Red

wire) to ground (refer NOTE 2 above).

Is voltage as specified at each terminal?

Approx.

12 Volts Go to Step 6 Check and repair

open or short in

circuits 542,

recheck and

verify repair.

6. 1. Turn ignition ON.

2. With control module connector A37 still

disconnected, check for voltage between terminal

X1-15, circuit 839 (Red wire) and ground (refer to

NOTE 2 above).

Is voltage as specified ?

Approx.

12 Volts Go to Step 7 Check and repair

open or short in

circuit 839

(including fuse

F27), recheck

and verify repair.

7. 1. Ignition OFF.

2. With control module connector A37 still

disconnected, check for continuity between control

module connector A37, terminal X1-16, circuit 350

(Black/Red wire) and ground locations

X119_G3_GP3 and X157_GP2 (refer to NOTE 2

above).

Does continuity exist ?

Go to Step 8 Check and repair

open in circuit

350, recheck and

verify repair.

8. 1. With control module connector A37 still

disconnected, check for continuity between control

module connector A37, terminal X1-19, circuit 150

(Black wire) and ground location X157_GP2 (refer

NOTE 2 above).

Does continuity exist ?

Replace

hydraulic

modulator asm,

refer to

3.5 HYDRAULIC

MODULATOR

AND CONTROL

MODULE

ASSEMBLY in

this Section.

Check and repair

open in circuit

150, recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 62 – RPM SIGNAL FAULT

Figure 5B-143

CIRCUIT DESCRIPTION:

To determine the requested torque signal and prevent the engine stalling, the ABS/TCS control module monitors

the engine s peed. An engi ne RPM signal is sent to terminal X 1-30 of the ABS/T CS control m odule from the Direct

Ignition System (DIS) module. This signal has a fixed duty cycle and a frequency that will vary with changing

engine RPM.

DTC 62 will s et if an RPM signal ( engine speed sig nal) is not r eceived b y the A BS/TCS contr ol module at te rminal

30, provided the engine speed is greater than 480 RPM.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC O FF warn ing displa y will b e activated and t he relevant DTC will be set. T he TRAC O FF warnin g displa y

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 62.

1. Checks for continuity in circuit 121.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37 A40 P3

X206

Figure 5B-144

DTC 62 – RPM SIGNAL FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Check continuity of circuit 121 between ABS/TCS

control module connector A37 terminal X1-30 and

connector X206 terminal 13 (Brown/Red wire). (refer

to NOTE 1 above).

Does continu ity ex ist?

Go to Step 3 Check and repair

open in circuit

121. Recheck

and verify repair.

3. 1. Check continuity of circuit 121 between ABS/TCS

control module connector A37 terminal X1-30 and

Instrument connector P3 terminal 6 (Brown/Red

wire).

Does continu ity ex ist?

Replace ABS/TCS

control modu le,

refer to 3.6

CONTROL

MODULE in this

Section, recheck

and verify repair.

Check and repair

open in circuit

121. Recheck

and verify repair.

4. 1. Check continuity of circuit 121 between DIS control

module connector A40 terminal X1-E and connector

X206 terminal 13 (Brown wire).

Does continu ity ex ist?

Replace DIS control

module, refer to

6C1-3 (V6) or 6C2-

3 V6 S/C

POWERTRAIN

CONTROL

MODULE.

Check and repair

open in circuit

121. Recheck

and verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 63 - VALVE SOLENOID RELAY CIRCUIT FAULT

Figure 5B-145

CIRCUIT DESCRIPTION:

When the ABS or ABS/TCS is active (ignition on), the valve relay provides voltage to actuate the six (ABS) or 10

(ABS/TCS) solenoid valves. However, the solenoid valves do not use this voltage unless the ABS or ABS/TCS

control module provides the ground for each solenoid.

DTC 63 will set if the va lve rela y voltage is low or if the r elay sup ply line is at 12 volts when the ABS or ABS/T CS

control module is not requesting it to be; this would make the relay constantly energised.

Also, DTC 63 will set if the ABS or ABS/TCS control m odule detects if three or m ore of the solenoid va lve circuits

between the valve relay terminal 30 and the control module are open circuited or shorted during the self test.

If a failure is detected which causes DTC 63 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning display/s for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 63 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 63.

1. This test uses Tech 2 to check valve relay operation.

2. Checks for constant battery voltage to the control module at terminals X1-17 and X1-18.

3. Checks for battery voltage to the control module at terminal 15 when the ignition is switched on.

4. Checks for continuity in ground circuit 350.

5. Checks for continuity in ground circuit 150.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37

Figure 5B-146

DTC 63 - VALVE SOLENOID RELAY CIRCUIT FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnosis / Chassis / ABS/TCS /

Miscellaneous Tests / Solenoid.

3. Conduct solenoid test on any one of the solenoid

valves (refer to NOTE 1 above).

Does test confirm that solenoid valve tested is OK ?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

Go to Step 3

3. 1. Turn ignition OFF.

2. Back probe control module connector A37, terminals

X1-17 and then X1-18, circuit 542 (Red wire) with a

voltmeter to ground (refer NOTE 1 above).

Is voltage as specified at each terminal ?

Approx. 12

Volts Go to Step 4 Check and repair

open or short in

circuits 542,

recheck and

verify repair.

4. 1. Turn ignition ON.

2. Back probe control module connector A37, terminal

X1-15 circuit 839 (Red wire) with a voltmeter to

ground (refer to NOTE 2 above)

Is voltage as specified ?

Approx. 12

Volts Go to Step 5 Check and repair

open or short in

circuit 839

(including fuse

F27), recheck

and verify repair.

5. 1. Disconnect contr ol mod ule co nnec tor A37.

2. Check for continuity between control module

connector A37, terminal X1-16, circuit 350

(Black/Red wire) and ground locations X157_GP2

and X119_G3_GP3 (RH inner fender and ABS

bracket in engine compartment).

Does continuity exist ?

Go to Step 6 Check and repair

open in circuit

350, recheck and

verify repair.

6. 1. With control module connector A37 still

disconnected, check for continuity between control

module connector A37, terminal X1-19, circuit 150

(Black wire) and ground location X157_GP2 (RH

inner fender).

Does continuity exist ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Check and repair

open in circuit

150, recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 67 – STOP LAMP SWITCH CIRCUIT FAULT

Figure 5B-147

CIRCUIT DESCRIPTION:

The ABS or ABS/TCS control module monitors the stop lamp switch signal at terminal X1-14 to determine if the

brakes are being manually applied.

DTC 67 will set if the voltage monitored at terminal X1-14 goes out of range; between approximately 6 and 9 volts.

If the ABS or AB S/T C S control module s ens es this f aul t, the A BS will op erate nor mall y, ho wever, it’s r espons e time

will be marginally slower (approx 10 milliseconds) to react than if this input was available. The TCS brake

intervention will be disabled immediately, while the TCS engine intervention will become disabled after the

operation. The TRAC OFF warning display will be activated and the relevant DTC will be set. The TRAC OFF

warning disp lay will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control

module will enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 67.

1. Checks for voltage at control module terminal X1-14 when brakes are applied.

2. Checks stop lamps to see if they activate when brakes applied.

3. Checks for continuity in circuit 20.

4. Checks circuit 640 for power to stop lamp switch.

5. Checks stop lamp switch.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37 S220 X1

Figure 5B-148

DTC 67 - STOP LIGHT SWITCH CIRCUIT FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Back probe control module connector A37, terminal

X1-14, circuit 20 (Blue/Red wire) with a voltmeter to

ground (refer to NOTE 1 above).

2. Apply brakes (brake switch closed).

Is voltage as specified ?

B+ Volts Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

Go to Step 3

3. 1. Apply brakes and check stop lamp operation.

Do stop lamps activate ? Go to Step 4 Go to Step 5

4. 1. Disconnect control module connector A37 and stop

lamp switch A, connector S220 X1.

2. Check for continuity between control module

connector A37, terminal X1-14 and stop lamp switch

connector S220 X1-A, circuit 20 (Blue/Red wire)

(refer to NOTE 1 above).

Does continuity exist ?

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

Check and repair

open in circuit 20,

recheck and

verify repair.

5. 1. Back probe stop lamp switch connector S220 X1-B,

circuit 640 (Orange/Blue wire) with a voltmeter to

ground (refer to NOTE 1 above).

Is voltage as specified ?

B+ Volts Go to Step 6 Check and repair

open or short in

circuit 640

(including fuse

F5), recheck and

verify repair.

6. 1. Back probe stop lamp switch A, connector S220 X1-

A, circuit 20 (Blue/Red wire) with a voltmeter to

ground (refer to NOTE 1 above).

2. Apply brakes (brake switch closed).

Is voltage as specified ?

B+ Volts System OK. Check and adjust

or replace stop

lamp switch A,

refer to

Section 12B

LIGHTING

SYSTEM.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 71 – CONTROL MODULE INTERNAL FAULT

Figure 5B-149

CIRCUIT DESCRIPTION:

The ABS or ABS/T CS c ontr ol m odule perf orms variou s diagnos tic c heck s on itse lf. If the control m odule detec ts an

internal fault, DT C 71 will be set.

If a failure is detected which causes DTC 71 to set, the ABS or ABS/TCS is disabled and the control module

activates the ABS or ABS and TRAC OFF warning lamps for the remainder of the ignition cycle. If the failure is

intermittent, the control module will enable the system at the next ignition cycle and a history DTC 71 will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 71.

1. This test checks for any additional system faults that may be causing DTC 71 to set.

2. Determines whether the DTC is set by an internal fault with the control module or by a faulty wiring connection.

3. This test checks the minimum supply voltage and integrity of the control module ground circuit.

4. This test checks for intermittent connections of the ABS control module connector and terminals to the module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

DIAGNOSTIC AIDS:

If circuit 839 (Red wire) or circuit 150 (Black wire) are open circuited, Tech 2 screen will display "NO DATA

RECEIVED FROM ABS".

A37

Figure 5B-150

Techline

DTC 71 - CONTROL MODULE INTERNAL FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / Diagnostic Trouble

Codes / Read DTCs (refer NOTE 1 above).

Are any other DTCs set?

Repair problems

ca usi ng other

DTCs to set. Go

to Step 2.

Go to Step 3

3. 1. With Tech 2 connected and Diagnostic Trouble

Codes selected, select Clear DTCs (refer to NOTE 1

above)

2. Road test vehicle.

Does DTC 71 set again ?

Go to Step 4 Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS or ABS/TCS

control modu le

connector

terminals.

4. 1. Disconnect contr ol mod ule co nnec tor A37.

2. Switch ignition ON and measure voltage between

connector A37, terminals X1-15 circuit 839 (Red

wire) and X1-19, circuit 150 (Black wire).

Is voltage as specified ?

At least 10

Volts Go to Step 5 Check voltage

supply and

ground

connections to

ABS or ABS/TCS

control modu le.

Refer Chart B –

POWER

SUPPLY TO

CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

5. 1. Check ABS control module connector A37 carefully

to ensure good electrical connection will all

terminals and that the connector is properly retained

when connected.

Is all OK?

Go to Step 6 Repair connector

and/or connector

retention,

recheck circuit to

verify repair.

6. 1. No fault found, Install Tech 2 to DLC and select

Diagnostics / Chassis / ABS/TCS / Diagnostic

Trouble Codes / Clear DTCs and clear all DTCs

(refer NOTE 1 above).

2. Road test vehicle.

Does DTC 71 set again ?

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

System OK.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 72 - SERIAL DATA FAULT

Figure 5B-151

CIRCUIT DESCRIPTION:

W ith the ignitio n ON, the A BS or ABS/T CS control m odule will be able to com municate wit h other contr ol modules

via the s erial d ata line , circuit 1061 (G reen/W hite wire ). If com municatio n bet ween the m odules is disr upted due to

a short or open circuit, DTC 72 will be set.

If the ABS/T CS control m odule senses this f ault, only the TC S system will be disabled (ABS op eration will o perate

normally), the TRAC OFF warning display will be activated and the relevant DTC will be set. The TRAC OFF

warning disp lay will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control

module will enable the system at the next ignition cycle and the relevant history DTC will be set.

There ar e severa l other control modules that are connec ted to the serial data circ uit (PCM , BCM, ABS/TC S, OCC,

SRS, and Instrument). Any of these control modules could cause a fault in the serial data line. This fault could

result in Tech 2 not being able to display serial data.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 72.

1. This test determines if fault is current or not.

2. This test checks for connector or wiring problems which may cause an intermittent fault.

3. Determines if fault is in wiring or ABS/TCS control module.

4. Determines if fault is with BCM serial data communication (bus master).

5. Checks if fault is caused by other control modules that are communicating on the serial data line.

6. Checks circuit 1061 and determines if fault is in wiring or control module.

7. Checks for continuity in circuit 1061.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

A fault with the ser ial d ata cir cuit coul d be ca used b y one or m ore of the sever al control lers connec ted to this serial

data circuit. Isolate the fault by disconnecting each controller one at a time until serial data communication is

restored.

A37 A15 X2

Figure 5B-152

DTC 72 - SERIAL DATA FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / ABS/TCS / Diagnostic

Trouble Codes / Clear DTCs and clear all DTCs

(refer to NOTE 2 above).

3. Road test vehicle.

Does DTC 72 set again ?

NOTE: Go to Step 4 if Tech 2 will not communicate with

the ABS/TCS control module.

Go to Step 4 Go to Step 3

3. 1. Inspect all system wiring and connections that could

cause intermittent faults. Check all wiring is in good

condition, terminals are clean and tight and making

good contact (refer NOTE 2 above).

Is wiring OK ?

NOTE: Other control modules (SRS, Instruments, OCC,

BCM, PCM) that are connected to the serial data circuit

could cause DTC 72 to set, therefore, check wiring and

connect ors that cou ld cau se in termit tent faults at these

control modu le s also.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS/TCS control

module

connector

terminals.

Make repairs as

necessary,

recheck and

verify repair.

In step 1, was Tech 2 able to communicate with the

ABS/TCS control module (refer NOTE 1 above)?

Go to Step 5 Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

5. 1. With Tech 2 connected, select Diagnostics / Body /

Body Control Module and turn ignition on as

requested (refer NOTE 1 above).

Does Tech 2 display BCM system identification

information?

Go to Step 6 Refer to BCM

Serial Data

Communication

diagnostics in

Section 12J

BODY

CONTROL

MODULE.

6. 1. Using Tech 2, check for similar DTCs (Serial Data

faults) that have been set by other control modules;

instruments, SRS, and OCC if applicable to model

variant (refer NOTE 1 above).

Have similar DTCs been set by other control modules ?

Go to Step 7 Go to Step 8

7. 1. Check circuit 1061 for open, short to ground or short

to voltage between BCM and individual control

modules (refer NOTE 2 above).

Is circuit 1061 OK?

NOTE: Disconnect each controller in circuit 1061 one at

a time to isolate the fault in the circuit or to identify

control modu le cau sin g fault.

Replace faulty

module, refer to

relevant Section

in the MY 2003

VY and V2

Series Service

Information.

Recheck and

verify repair.

Make repairs as

necessary,

recheck and

verify repair.

8. 1. Disconnect BCM connector A15 BCM and ABS/TCS

control modu le con nect or A37.

2. Check for continuity between BCM connector A15

terminal X2-9 and ABS/TCS control module

connector A37, terminal X1-11, circuit 1061

(Green/White wire) (refer to NOTE 2 above).

Does continuity exist ?

Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Check and repair

open in circuit

1220 between

BCM and

ABS/TCS control

module, recheck

and verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 73 – REQUESTED TORQUE CIRCUIT FAULT

Figure 5B-153

CIRCUIT DESCRIPTION:

W ith the ignition o n, the ABS/T CS c ontrol m odule c ons tantl y sends a Puls e W idth Modulat ed ( PW M) signal at 93%

with a f requenc y of 100 H z to the PCM via ter m inal X1 -13, on circ uit 4 63 (Orang e/White wire). This is to indic ate to

the PCM th at the trac tion control system ( TCS) is in a state of readiness. If the ABS/T CS contro l module re quests

traction control, engine intervention, it signals the PCM to reduce engine torque by varying the duty cycle of this

P WM signal.

DTC 73 will set if this frequency output signal deviates outside a frequency specification (95 – 105 Hz) or if the

signal stops for more than 50 milliseconds.

If the ABS/TCS control module senses this fault, the TCS system will be disabled (ABS operation will operate

norm ally), the T RAC OFF war ning lam p will b e acti vated and DT C 73 will be s et. T he TRAC O FF warning la m p will

remain activated for the rem ainder of the ignition cycle. If the failure is intermittent, the control m odule will enable

the system at the next ignition cycle and the logged DTC will become history.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 73.

1. Checks if ABS/TCS control module is sending signal to PCM.

2. Checks circuit 463.

3. Checks if PCM is returning message to ABS/TCS control module.

4. Checks circuit 464.

5. Determines if fault is within ABS/TCS control module or whether fault is intermittent.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7, TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P, WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

If DTC 74 [PCM / TCS INT ERFACE FA ULT ( MMI - T ORQ UE AC KNOWLEDGMENT )] is logge d as wel l as DT C 73,

always perform diagnostics for DTC 73 first.

When DTCs 73 and 74 are logged by the ABS/TCS control module, the PCM will also log it’s own DTC, P1571 (V6)

or 95 (V6 S/C).

A84-X1 V6 & V6 S/C A84-X2 V6 & V6 S/C A84-X3 V6 & V6 S/C

A37

Figure 5B-154

DTC 73 - REQUESTED TORQUE CIRCUIT FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Turn ignition ON.

2. Back probe ABS/TCS control module connector

A37, terminal X1 -13, circuit 463 (Orange/White wire)

with a digital multimeter to ground (refer NOTE 2

above).

Is value as specified ?

95 – 105 Hz &

4.2 – 4.8

Volts

Go to Step 3 Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

3. 1. Turn ignition ON.

2. Back probe PCM connector A84, terminal X1-B8

(V6) or X2-C11 (V6 S/C), circuit 463 (Orange/White

wire) with a digital multimeter to ground (refer to

NOTE 2 above).

Is value as specified?

95 – 105 Hz &

4.2 – 4.8

Volts

Go to Step 4 Check and repair

open or short in

circuit 463,

recheck and

verify repair.

4. 1. Turn ignition ON.

2. Back probe PCM connector A84, terminal X1-B11

(V6) or X3-F7 (V6 S/C), circuit 464 (Black/White

wire) with a digital multimeter to ground (refer NOTE

2 above).

Is value as specified?

95 – 105 Hz &

0.1 – 1.0

Volts

Go to Step 5 Replace PCM,

refer to

6C1-3 (V6)

POWERTRAIN

MANAGEMENT

6C2-3 (V6 S/C)

POWERTRAIN

MANAGEMENT

5. 1. Turn ignition ON.

2. Back probe ABS/TCS control module connector A37

terminal X1-27, circuit 464 (Black/W hite wire) with a

digital multimeter to ground (refer to NOTE 2

above).

Is value as specified ?

95 – 105 Hz &

0.1 – 1.0

Volts

Go to Step 6 Check and repair

open or short in

circuit 464,

recheck and

verify repair.

6. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / ABS/TCS / Diagnostic

Trouble Codes/ Clear DTCs and clear all DTCs

(refer NOTE 1 above).

3. Road test vehicle.

Does DTC 73 set again ?

Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS/TCS control

module

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 74 - ACTUAL TORQUE CIRCUIT FAULT

Figure 5B-155

CIRCUIT DESCRIPTION:

On receiving the request torque signal, the PCM will modify the output of the engine and then send an actual

torque s ignal to th e ABS/TCS c ontrol m odule, v ia circuit 4 64, which is a Pu lse Width Mo dulated ( PWM) signal with

a frequency of 100 Hz. The duty cycle of the torque acknowledgment signal will vary depending on the torque

reduction achieved, ie. The actual torque of the engine.

Provided the engine speed is above 480 RPM, DTC 74 will set if this frequency deviates outside the frequency

specification (95 – 105 Hz) or if the signal stops for more than 100 milliseconds.

If the ABS/TCS control module senses this fault, the TCS system will be disabled (ABS operation will operate

norm ally), the T RAC OFF war ning lam p will b e acti vated and DT C 74 will be s et. T he TRAC O FF warning la m p will

remain activated for the rem ainder of the ignition cycle. If the failure is intermittent, the control m odule will enable

the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 74.

1. Checks if ABS/TCS control module is receiving a signal from the PCM.

2. Checks circuit 464.

3. Checks if PCM is at fault and not sending message to ABS/TCS control module.

4. Checks circuit 463.

5. Determines if fault is within ABS/TCS control module or whether fault is intermittent.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

If DTC 74 [PCM / TCS INT ERFACE FA ULT ( MMI - T ORQ UE AC KNOWLEDGMENT )] is logge d as wel l as DT C 73,

always perform diagnostics for DTC 73 first.

When DTCs 73 and 74 are logged by the ABS/TCS control module, the PCM will also log it’s own DTC of P1571

(V6) or 95 (V6 S/C).

A84-X1 V6 & V6 S/C A84-X2 V6 & V6 S/C A84-X3 V6 & V6 S/C

A37

Figure 5B-156

DTC 74 - ACTUAL TORQUE CIRCUIT FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Turn ignition ON.

2. Back probe ABS/TCS control module connector

A37, terminal X1-27, circuit 464 (Black/White wire)

with a digital multimeter to ground (refer to NOTE 2

above).

Is value as specified ?

95 – 105 Hz &

0.1 – 1.0

Volts

Go to Step 6 Go to Step 3

3. 1. Turn ignition ON.

2. Back probe PCM connector A84, terminal X1-B11

(V6) or X3-F7 (V6 S/C), circuit 464 (Black/White

wire) with a digital multimeter to ground (refer NOTE

2 above).

Is value as specified?

95 – 105 Hz &

0.1 – 1.0

Volts

–

Check and repair

open or short in

circuit 464,

recheck and

verify repair.

Go to Step 4

4. 1. Turn ignition ON.

2. Back probe PCM connector A84, terminal X1-B11

(V6) or X3-F7 (V6 S/C), circuit 464 (Black/White

wire) with a digital multimeter to ground (refer NOTE

2 above).

Is value as specified?

95 – 105 Hz &

4.2 – 4.8

Volts

Go to Step 5 Replace PCM,

refer to

6C1-3 (V6), or

6C2-3 (V6 S/C)

POWERTRAIN

MANAGEMENT.

5. 1. Turn ignition ON.

2. Back probe ABS/TCS control module connector A37

terminal X1-27, circuit 464 (Black/White wire) with a

digital multimeter to ground (refer to NOTE 2

above).

Is value as specified?

95 – 105 Hz &

4.2 – 4.8

Volts

Check and repair

open or short in

circuit 464,

recheck and

verify repair.

Replace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

6. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / ABS/TCS / Diagnostic

Trouble Code s/ Clear DTCs and clear all DTCs

(refer NOTE 1 above).

3. Road test vehicle.

Does DTC 74 set again ?

Replace

ABS/TCS control

module, refer 3.6

CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS/TCS control

module

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 78 – INCORRECT OPTION CODING

CIRCUIT DESCRIPTION:

This DTC relates to a difference in the interfacing of the ABS/TCS control module and other control modules and is

only applicable to the ABS/TCS system, not the ABS only system.

Control modules are specifically designed for a particular vehicle option; i.e. V6 or V6 Supercharged. If any module

that communicates with the ABS/TCS control module is for an incorrect application, including the ABS/TCS control

module, DTC 78 will be set.

If the ABS/TCS control module senses this fault, only the TCS system will be disabled (ABS operation will operate

normally), the TRAC OFF warning display will be activated and the relevant DTC will be set. The TRAC OFF

warning display will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control

module will enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 78.

1. Physical check to determine if correct control modules are fitted to the vehicle.

2. Checks for other DTCs logged that may cause DTC 78 to log.

3. Checks if fault is intermittent or in ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

1. Refer to 4.7, TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

2. There are different control modules used in the MY 2003 VY and V2 Series vehicles for ABS and ABS/TCS

systems. It is physically impossible to fit an ABS control module to an ABS/TCS hydraulic modulator or an

ABS/TCS control module to a ABS hydraulic modulator. However, if replacing either an ABS or ABS/TCS

control module, always refer to the latest PartFinder® Parts Information for the correct ABS control module part

numbers.

DTC 78 - INCORRECT OPTION CODING

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

Are the correct control modules that communicate with

the ABS/TCS control module, including the ABS/TCS

control module, installed in the vehicle (ABS/TCS and

PCM) (refer to NOTE 2 above)?

Go to Step 3 Replace control

module with

control modu le

that matches

vehicle

specifications,

recheck and

verify repair.

3. 1. Install Tech 2 to DLC and check if other system

DTCs are set (refer to NOTE 1 above).

Are other codes present ?

Repair problems

ca usi ng DTC to

set.

Go to Step 4

4. 1. With Tech 2 connected, Select Diagnostics /

Chassis / ABS/TCS / Diagnostic Trouble Codes/

Clear DTCs and clear all DTCs (refer NOTE 1

above).

2. Road test vehicle.

Does DTC 78 set again?

If correct control

modules are

installed in the

vehicle, repl ace

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

circuit to verify

repair.

Fault not present.

Check all system

wiring harness

connect ors and

terminals, in

particular the

modulator and

ABS/TCS control

module

connector

terminals.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 85 – SYSTEM VOLTAGE TOO LOW

Figure 5B-157

CIRCUIT DESCRIPTION:

The ABS or ABS/TCS control module (A37) is supplied with power to terminal X1-15, circuit 839 (Red wire) from

the battery via fuse F27 when the ignition is in the IGN or START positions.

DTC 85 will s e t if th e AB S or A BS/T C S co ntr ol modul e det ec ts a vo ltage of 1 0 vo lts or les s on terminal X 1- 15 wh en

the ignition is in the IGN or START positions.

If a failure is detected which causes DTC 85 to set, the ABS or ABS/TCS system is disabled and the control

module activates the ABS or ABS and TRAC OFF warning displays for the remainder of the ignition cycle. If the

failure is intermittent, t he control m odule will enable the s ystem at the next igniti on cycle and a hist ory DTC 85 will

be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 85.

11. Uses T ech 2 to deter m ine if the AB S or A BS/TC S cont rol m odule is recei ving nor m al battery vol tage, ab ove 10

volts.

12. Checks to see if the low voltage reading is due to the generator. If the voltage is below 10 volts, the ABS or

ABS/TCS control module is OK.

13. Checks for open in circuit 839.

14. Checks if low reading is due to faulty connection in circuit 839 or faulty ABS or ABS/TCS control module.

NOTES ON DIAGNOSTIC CHART:

15. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

16. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

DIAGNOSTIC AIDS:

If DTC 85 sets when an accessory is operated, check for poor connections or excessive current draw.

A37

Figure 5B-158

DTC 85 – SYSTEM VOLTAGE TOO LOW

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried

out? Go to Step 2 Go to 4.4 ABS or

ABS/TCS

Functional Check

2. 1. Install Tech 2 to DLC

2. Select Diagnostics / Body / Body Control Module /

Data List and scroll to BATTERY VOLTAGE (refer to

NOTE 1 above).

3. Engine running (idle).

Is battery voltage shown on Tech 2 above specified

value?

10 Volts Fault not present.

If no additional

DTCs were

stored, refer to

Diagnostic Aids

above.

Go to Step 3

3. 1. Measure voltage across battery terminals.

Is voltage equal to or above specified value ? 10 Volts Go to Step 4 Check generator

operation, refer

to 6D1-1 (V6) or

6D2-1 (V6 S/C)

CHARGING

SYSTEM.

4. 1. Ignition OFF.

2. Disconnect contr ol mod ule connector A37.

3. Switch ignition ON and measure voltage between

connector A37, terminals X1-15 and ground (refer to

NOTE 2 above).

Is voltage equal to or above specified value ?

10 Volts Go to Step 5 Check and repair

open in circuit

839 (Red wire)

(including fuse

F27), recheck

and verify repair.

5. 1. Check for faulty ABS or ABS/TCS control module

connection for circ uit 839.

Was a fault found ?

Repair fault as

necessary,

recheck and

verify repair.

Replace ABS or

ABS/TCS control

module, refer to

3.6 CONTROL

MODULE in this

Section, recheck

and verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

5. ABS/TCS DIAGNOSIS – GEN III V8 ENGINE ONLY

CAUTION: Certain components in the Anti-lock Brake System and Electronic Traction Control system are

not intended to be serviced individually. Attempting to remove or disconnect certain system components,

such as the solenoid valves or pump motor from the hydraulic modulator, may result in personal injury

and/or improper system operation. Only those components with approved removal and reinstallation

procedures described in 3. SERVICE OPERATIONS in this Section, should be serviced.

Before attempting any diagnostic work on the ABS, refer to and read the 'SAFETY AND PRECAUTIONARY

MEASURES' as described in 3. SERVIC E OPERATIO NS, in this Section.

5.1 GENERAL DESCRIPTION

Diagnostic information in this Section relates only to ABS/TCS systems on vehicles with GEN III V8 engines.

Addition all y, only diag nosti c inf orm ation that dif fer s from the AB S/T CS s ystem used on M Y 2003 VY and V2 Ser ies

models with V6 engines is detailed. For diagnostic information that is not detailed in this Section, refer to

4. ABS, ABS/T CS DIAGNOSIS in this Sec ti on.

The following information is necessary when diagnosing any Anti-lock Braking System problem or failure,

specifically it should be used to diagnose conditions that may cause the illumination of the ABS or TRAC OFF

warning displays in the Instrument.

Should conditions exist with the conventional (non ABS) portion of the braking system which cause the BRAKE

FAILURE warning lamp to illuminate (also in the Instrument), or there is some other obvious brake mechanical

problem, such as brake noise, brake pulsation (pedal or vehicle vibration during normal brake application), brake

pull or a park ing brak e problem , then these problem s m ust be corrected bef ore attem pting to rectif y any suspected

ABS/TCS problem. Refer to Section 5A SERVICE AND PARK BRAKING SYSTEMS for diagnosis and repair of

the conventional braking system.

5.2 BASIC KNOWLEDGE REQUIRED

Refer to 4.2 BASIC KNOWLEDGE REQUIRED, in this Section.

5.3 VISUAL INSPECTION

W hen inves tig ati ng any complaint of an ABS/TCS system pr oblem or m a lf unction, star t di agn os is with an ABS/TCS

visual ins pec t ion .

The ABS/T CS visua l inspe ction is an exam ination of easil y acc essible c omponent s that could caus e problem s with

the system. The visual inspection procedure may quickly identify the cause and eliminate the need for additional

diagnosis.

If the complaint condition cannot be resolved by a visual check of the system components, then proceed to the

ABS/TCS Functional Check, detailed after the Visual Inspection Chart.

ABS/TCS VISUAL INSPECTION CHART

ITEM INSPECT FOR CORRECTIVE ACTION

GENERAL

Wheel and Tyres Recommended tyre and

wheel size fitted to vehicle Fit recomm ended size t yres

and wheels

BR AKE SYST EM COM PONENTS

Master Cylinder Fluid

Reservoir Low fluid level Add fluid as required.

Determine cause of fluid

loss and repair

Hydraulic Modulator External leaks If leakage is excessive,

replace modulator

Brake Booster And Master

Cylinder Correct installation and

assembly Reinstall or reposition

components correctly

Park Brake Mechanism Mechanism fully releasing Operate lever to verify

release. Adjust cable or

repair release mechanism

as required

FUSES

ENGINE COMPARTMENT

ABS Fusible Link F103 Blown fusible link Replace fusible link. Inspect

for cause of failure

PASSENGER

COMPARTMENT

Throttle Relaxer Fuse F36 Blown fuse Replace fuse. Inspect for

ABS Fuse F27 cause of fuse failure

Warning Lamp Fuse F13

(Ignition Circuit)

Stop Lamp Fuse F5

WIRING CONNECTIONS

ENGINE COMPARTMENT

ABS/TCS Control Module

Wiring Harness Connector.

In all cases, inspect for:

Main Wiring Harness to Front

Wheel Speed Sensor

Connections.

Proper engagement.

Loose wires or terminals.

Ensure proper engagement

Repair as required

Hydraulic modulator pump

motor wiring harness

connector

Corroded or broken

connections

PASSENGER

COMPARTMENT

Main Wiring Harness to Body

Harness Connectors

UNDER VEHICLE

Front Wheel Speed Sensor

Lead to Front Wheel Hub

Connections

Body Harness to Rear Wheel

Speed Sensor Con necti ons

5.4 ABS/TCS FUNCTIONAL CHECK

If the source of the system problem or malfunction was not isolated during the ABS, ABS/TCS visual inspection,

carry out the following ABS, ABS/TCS functional check. Also, use the check to verify normal ABS/TCS operation

during diagnosis or after making any system repairs.

ABS OR ABS/TCS FUNCTIONAL CHECK CHART

STEP ACTION YES NO

1. Has ABS/TCS Visual Inspection been performed?

Go to Step 2. Perform ABS, ABS/TCS

Visual Inspection as

detailed in 5.3 in this

Section before

proceeding.

2. 1. While observing the Brake Failure warning display, turn

the ignition to the Bulb Check position (engine cranking

position).

Is the Brake Failure warning lamp activated?

Go to Step 3. Check warning lamp

circuit, refer to

Section 12C

INSTRUMENTS.

3. 1. Turn ignition OFF.

2. Turn ignition ON whilst observing ABS or ABS and

TRAC OFF warning displays.

Are the warning displays activated for approximately three

seconds (five seconds for TRAC OFF lamp) then turn OFF?

NOTE: If the engine is started, the warning displays will only

be activated for 2 seconds

Go to Step 7. Go to Step 4.

4. 1. Install Tech 2 to DLC.

2. Select Chassis / ABS/TCS and press CONFIRM.

Does Tech 2 communicate with the ABS by displaying the

System Identification Information?

Go to Step 5. Refer to DTC 72 -

SERIAL DATA FAULT

Diagnosis in t his Section.

5. 1. With Tech 2 still connected, select Diagnostic Trouble

Codes / Read DTCs.

Are any DTCs set?

Go to Step 6. Refer to Charts A1, A2

(WARNING DISPLAY

INOP.) or CHARTS C1,

C2 (WARNING DISPLAY

ILLUMINATED

CONTINUOUSLY) in 4.9

DIAGNOSTIC CHARTS,

in this Section.

6. 1. Select relevant DTC Function Key.

Are the ignition cycles zero (0)? Refer to relevant

ABS/TCS DTC chart in

this Section or in 4.9

DIAGNOSTIC CHARTS,

in this Section.

Refer to

5.5 INTERMITTENT

FAILURES

in this Section.

7. 1. Road test vehicle, ensuring to achieve at least a speed

of 35 km/h.

Did the ABS warning lamp turn on during the road test ?

NOTE: Ensure Tech 2 is disconnected during road test.

Go to Step 5. Go to Step 8.

8. During the road test, did the vehicl e exhibit any symptoms or

improper operation that may be mechanical in nature and/or

did the Brake Failure warning display activate?

Refer to

5A SERVICE AND

PARK BRAKING

SYSTEMS

for conventional braking

system repair details.

Go to Step 9.

9. 1. Install Tech 2 to DLC and turn ignition ON.

2. Check for any ABS History DTCs.

Are any History DTCs present (1 or more ignition cycles)?

Refer to relevant

ABS/TCS DTC

diagnostic chart in this

Section or in 4.9

DIAGNOSTIC CHARTS.

Chart may be used to

identify and isolate

suspected failures. Also,

refer to 4.5,

INTERMITTENT

FAILURES in this

Se ction for m ore

information on isolating

suspected failures.

Clear all DTCs and

repeat this function al

check.

System OK, however, if

a fault is still suspected,

refer to

4.5, INTERMITTENT

FAILURES

in this Section.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

5.5 INTERMITTENT FAILURES

Refer 4.5 INTER MITTENT FAILURES, in this Section.

5.6 ABS/TCS SELF DIAGNOSTICS

Refer 4.6 ABS & ABS/TCS SELF DIAGNOSTICS, in this Sect io n.

5.7 TECH 2 DIAGNOS TICS

Refer 4.7 TECH 2 DIAGNOSTICS, in this Section.

5.8 TECH 2 TEST MODES AND SCREEN DISPLAYS FOR ABS/TCS DIAGNOSIS

Refer 4.8 TECH 2 TEST MODES AND SCREEN DISPLAYS FOR ABS AND TCS DIAGNOSIS, in this Section.

5.9 DIAG NOS TIC CHARTS

INTRODUCTION

The f ollowing diag nostic c har ts are d esig ned to provi de f ast and eff icient fau lt loc atio n of th e AB S/T CS s ystem s f or

vehicles with GEN III V8 engines. Each diagnostic chart consists of: a ‘diagnostic chart’, connector body terminal

assignments for connectors relevant to that particular diagnostic chart, and pertinent information including

Diagnostic Trouble Code (DTC) setting parameters and circuit diagrams.

NOTE 1: For diagnostic charts not published in this Section, refer to 4.9 DIAGNOSTIC CHARTS – V6 ENGINES.

NOTE 2: Always refer to Section 12P WIRING DIAGRAMS when stated in the diagnostic charts in this Section.

The follo wing figures illus trate the terminal l ayout of the various connectors used in the GEN III V8 engin e system .

These figures should be used in conjunction with the diagnostic chart circuit diagrams, when checking circuit faults.

When carrying out wiring checks as directed b y the diagnostic charts, rather than probe t erminals and con nectors

with incorr ect sized m ultimeter connect ions, use the adapt ors contained in c onnector test adapt or kit, suc h as KM-

609. This will prevent any possibility of spreading or damaging wiring harness terminals.

Diagnostic Ai d

It is ver y important that before an y c omponent be replaced, when recomm ended in a diagnostic procedure, that a

thorough inspection of the wiring and connectors be performed. Terminals should be checked for corrosion and

correct sizing. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing

unnecessary part replacement with reappearance of the malfunction.

On-Veh ic le Ser vic e

When a diagnostic chart in this Section makes reference to removing/reinstalling or checking a component for

proper mounting or operation, refer to the appropriate service operation in 3. SERVICE OPERATIONS in this

Section.

After all diagnosis and repairs are completed, road-test the vehicle to ensure proper ABS/TCS operation and the

ABS and T RAC O FF warn ing disp la ys are not ac tivate d, refe r to 5.4 FUNCTION AL CHECK in this Section. If Tech

2 was used for diagnosis, d isconnect it f rom the DLC and turn the ignition OFF for at least 10 sec onds before road

testing. This is necessary to reset the ABS/TCS control module as it is disabled during most Tech 2 diagnostic

procedures, and does not reset until serial data communication is stopped and ignition power is lost.

Wiring Harness Connectors

Figure 5B-159 – GEN III V8 Wiring Harness Connectors

Legend

A5 Powertrain Interface Module (PIM)

A14-X1 Blower Motor & A/C Compressor

A15-X3 Body Control Module

A18 Cruise Control Module

A37 ABS & ABS/TCS Control Module

A84 V8-X1 Powertrain Control Module – GEN III V8 Engine

A84 V8-X2 Powertrain Control Module – GEN III V8

Engine

A111 Throttle Relaxer Control Module

B52 Wheel Speed Sensor – Front

B76 Wheel Speed Sensor – Rear

B82 Throttle Position Sensor

P3 Instrument Cluster

Figure 5B-160 – GEN III V8 Wiring Harness Connectors

Legend

S73 Traction Control Switch

S149-X1 Ignition and Start Switch

S220-X1 Stop Lamp & Traction Control Switch

S220-X2 Stop Lamp & Traction Control Switch

X40 Data Link Connector (DLC)

X157 Ground Connector

X200 Body Wiring Harness to Main Wiring Harness

X201 Body Wiring Harness to Main Wiring Harness

X206 Main Wiring Harness to Powertrain Wiring Harness

X301 Transmission Switch to Main Wiring Harness

Y38 Throttle

DTC 58 – THROTTLE RELAXER PWM INTERFACE FAULT

Figure 5B-161

CIRCUIT DESCRIPTION:

W ith the ignition o n, the ABS/T CS c ontrol m odule c ons tantl y sends a Puls e W idth Modulat ed ( PW M) signal at 90%

with a frequency of 100 Hz to the throttle relaxer control module on the requested throttle position line (DKR), via

term inal X1-13, circui t 463 (Or ange/W hite wire). T his signal is to indicat e to the throttle r elaxer contro l module t hat

the traction control system (TCS) is in a state of readiness. If the ABS/TCS control module requests traction

control, throttle reduction, it signals to the throttle relaxer control module to reduce the throttle opening b y varying

the duty cycle of this PWM signal.

DTC 58 will set if this frequency output signal deviates outside a frequency specification (95 – 105 Hz) or if the

signal stops for more than 50 milliseconds. The throttle relaxer control module A111 monitors this line and, if the

above cond it ions ar e d etec t ed, the t hr ott le rel ax er c ontr ol module sends a PWM signal of 93% on the actu al throttl e

position line (D KI), circuit 464 (Black/White wire) back to the ABS/TCS control module A37. The ABS/TCS control

module interprets this signal (or if no PWM signal is returned) as a DKR of throttle relaxer control module fault.

If the ABS/TCS control module senses this fault, the TCS system will be disabled (ABS operation will operate

norm all y), the T RAC O FF warni ng dis p lay will be ac tivated and DTC 58 will be s et. T he TRAC O FF warning dis play

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 58.

1. Checks for continuity in ground circuit 450.

2. Checks for continuity in ground circuit 450.

3. Checks circuit 839 for an open or high resistance.

4. Checks circuit 463 for an open, short to ground or short to voltage.

5. Checks circuit 464 for an open, short to ground or short to voltage.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A111 A37

Figure 5B-162

DTC 58 - THROTTLE RELAXER PWM INTERFACE FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Disconnect the throttle relaxer control module

connector A111.

2. Check resistance between connector A111, terminal

X1-28, circuit 450 (Black/Red wire) and ground

location X119_GP5/GP6 (engine block) (refer NOTE 1

above).

Is value as specified?

0 – 5 Ohms Go to Step 3 Repair circuit

450 as

necessary,

recheck and

verify repair.

3. 1. With connector A111 disconnected, check resistance

between connector A111, terminal X1-55, circuit 450

(Black/Red wire) and ground location X119_GP5/GP6

(refer to NOTE 1 above).

Is value as specified?

0 – 5 Ohms Go to Step 4 Repair circuit

450 as

necessary,

recheck and

verify repair.

4. 1. With connector A111 disconnected, turn the ignition

switch to the ON position.

2. Measure voltage between the throttle relaxer control

module connector A111, terminals X1-1 and X1-28

(refer to NOTE 1 above).

Is voltage as specified?

Battery + Go to Step 5 Repair circuit

839 as

necessary,

recheck and

verify repair.

5. 1. With connector A111 disconnected, disconnect the

ABS/TCS control module connector A37.

2. Check integrity (open, short to ground and short to

voltage) of circuit 463 (Orange/White wire) between

connector A37 terminal X1-13 and connector A111

terminal X1-37 (refer to NOTE 1 above).

Is integrity of circuit 463 OK?

Go to Step 6 Repair circuit

463 as

necessary,

recheck and

verify repair.

6. 1. With connectors A111 and A37 disconnected, check

integrity (open, short to ground and short to voltage) of

circuit 464 (Black/White wire) between connector A37

terminal X1-27 and connector A111 terminal X1-35

(refer to NOTE 1 above).

Is integrity of circuit 464 OK?

Replace throttle

relaxer control

module, refer

3.9 THROTTLE

RELAXER

CONTROL

MODULE in this

Section.

Recheck and

verify repair.

Repair circuit

464 as

necessary,

recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 62 – RPM SIGNAL FAULT

Figure 5B-163

CIRCUIT DESCRIPTION:

To determine the requested amount of spark retard, and prevent the engine from stalling, the ABS/TCS control

module monitors the engine speed. An engine RPM signal is sent to terminal X1-30 of the ABS/TCS control module

A37 from the PCM A84. This signal has a fixed duty cycle and a frequency that will vary with changing engine

RPM.

DTC 62 will s et if an RPM signal ( engine speed sig nal) is not r eceived b y the A BS/TCS contr ol module at te rminal

X1-30, provided the engine speed is greater than 480 RPM.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC OFF warning l amp will be i lluminated a nd the relevant DT C will be set . The TRAC OF F warning display

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 62.

1. Checks for continuity in circuit 121.

NOTE: The diagnostic procedure for this DTC assumes that the tachometer is functioning correctly. If the

tachometer is not functioning correctly, or PCM DTC P0654 is set, refer to Section 6C3-2A DIAGNOSTIC

TABLES – GEN III V8 ENGINE.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

A37 X206

Figure 5B-164

DTC 62 – RPM SIGNAL FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Disconnect ABS/TCS control module connector A37

and engine harness connector X206.

2. Check continuity of circuit 121 (Brown/Red wire)

between ABS/TCS control module connector A37,

terminal X1-30 and engine harness connector X206,

terminal 19 (refer to NOTE 1 above).

Does continu ity ex ist?

Replace

ABS/TCS control

module, refer 3.6

CONTROL

MODULE, in this

Section.

Recheck and

verify repair.

Check and

repair open in

circuit 121.

Recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 64 – THROTTLE RELAXER CONTROL MODULE POSITION FAULT

Figure 5B-165

CIRCUIT DESCRIPTION:

The ABS/TCS control module continuously receives a throttle position message every 200 milliseconds, via the

actual throttle position line (DKI), circuit 464 (Black/White wire).

DTC 64 wil l set if a mes s age is not r ec eive d f r om the t hrottl e p os ition s ens or f or more than s ix s ec o nds. If this DTC

is set, there will probably be a PCM DTC set also. If a PCM DTC is set, remedy this fault first.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC OFF warning display will be activated and the relevant DTC will be set. The TCS system will remain

disabled and TRAC OFF warning display will remain activated until the ABS/TCS control module receives five

consecutive throttle position messages. After five consecutive messages are received by the ABS/TCS control

module, the control module will enable the system, and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 64.

1. Determines if fault is related to the ABS/TCS system of the powertrain management system.

2. Checks circuit 411 for open or high resistance.

3. Checks circuit 2701 for open or high resistance.

4. Checks circuit 2752 for open or high resistance.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS in the MY 2003 VY and V2

Series Service Information.

2. Refer to 4.7 TECH 2 DIAGNOSTICS, in this Section for connecting and using Tech 2.

A84–X1 (BLUE) A84-X2 (RED)

A111 B82

Figure 5B-166

DTC 64 – THROTTLE RELAXER CONTROL MODULE POSITION FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Install Tech 2 to the DLC (refer NOTE 2 above).

2. Select Diagnosis / Engine / GEN III V8 / Diagnostic

Trouble Codes / Read DTC Info Ordered Priority.

Are any PCM DTCs set (in particular DTCs related to the

throttle position switch)?

Rectify fault

ca usi ng PC M

DTC to set, refer

to 6C3-2A

DIAGNOSTIC

TABLE – GEN III

V8.

Go to Step 3

3. 1. Disconnect throttle relaxer control module wiring

harness connector A111, the throttle position sensor

wiring harness connector B82 and the PCM wiring

harness connector A84-X2 (RED).

2. Measure resistance between connector A111, terminal

X1-40 and connector B82, terminal X1-C, circuit 411

(Blue wire) (refer to NOTE 1 above).

Is resistance as specified?

0 – 5 Ohms Go to Step 5 Check and

repair open or

high resistance

in circuit 411

between

connector A111

and B82.

Recheck circuit

to verify repair.

4. 1. With connectors A111, B82 and A84 X1 (BLUE)

disconnected, measure resistance between connector

A111, terminal X1-41 and connector B82 terminal X1-

A, circuit 2701 (Grey wire) (refer NOTE 1 above).

Is resistance as specified?

0 – 5 Ohms Go to Step 5 Check and

repair open or

high resistance

in circuit 2701

between

connector

YB170 and

YE30. Recheck

circuit to verify

repair.

5. 1. With connectors A111, B82 and A84 X1 (BLUE)

disconnected, measure resistance between connector

A111, terminal X1-43 and connector B82 terminal X1-

B, circuit 2752 (Black/Yellow wire) (refer NOTE 1

above).

Is resistance as specified?

0 – 5 Ohms Replace throttle

relaxer control

module, refer

3.9 THROTTLE

RELAXER

CONTROL

MODULE in this

Section.

Recheck and

verify repair.

Check and

repair open or

high resistance

in circuit 2752

between

connector A111

and B82.

Recheck circuit

to verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 65 – THROTTLE RELAXER MOTOR FAULT

Figure 5B-167

CIRCUIT DESCRIPTION:

The throttle relaxer Y38 is controlled at a commanded current rate by the throttle relaxer control module A111.

DTC 65 will set if the throttle relaxer motor or circuit is open, shorted to ground or shorted to voltage.

If the ABS/TCS control module A37 senses this fault, only the TCS system will be disabled (ABS will operate

normally), the TRAC OFF warning lamp will be illuminated and the relevant DTC will be set. The TRAC OFF

warning lamp will rem ain illum inated for th e remainder of the ignition cycle. If th e failure is interm ittent, the control

module will enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 65.

1. – 2. Checks continuity of circuit 450.

3. – 4. Checks integrity (open or short to ground) of circuit 1440 (including fuse F36).

5. Determines if the throttle relaxer motor Y38 is faulty.

6. – 7. Checks for open in circuit 560.

8. – 9. Checks for open in circuit 561.

10. Checks for short to ground in circuit 560.

11. Checks for short to ground in circuit 561.

12. Checks for short to voltage in circuit 560.

13. Checks for short to voltage in circuit 561.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS.

A111 Y38

Figure 5B-168

DTC 65 – THROTTLE RELAXER MOTOR FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Disconnect the throttle relaxer control module

connector A111.

2. Check resistance between connector A111, terminal

X1-28, circuit 450 (Black/Red wire) and ground

location X119_GP5/GP6 (engine block) (refer NOTE 1

above).

Is value as specified?

0 – 5 Ohms Go to Step 3 Repair circuit

450 as

necessary,

recheck and

verify repair.

3. 1. With connector A111 disconnected, check resistance

between connector A111, terminal X1-55, circuit 450

(Black/Red wire) and ground location X119_GP5/GP6

(refer to NOTE 1 above).

Is value as specified?

0 – 5 Ohms Go to Step 4 Repair circuit

450 as

necessary,

recheck and

verify repair.

4. 1. With connector A111 disconnected, measure voltage

between the throttle relaxer control module connector

A111, terminals X1-51 and X1-28 (refer to NOTE 1

above).

Is voltage as specified?

Battery + Go to Step 5 Repair circuit

1440 (including

fuse F36) as

necessary,

recheck and

verify repair.

5. 1. With connector A111 disconnected, measure voltage

between the throttle relaxer control module connector

A111, terminals X1-24 and X1-28 (refer to NOTE 1

above).

Is voltage as specified?

Battery + Go to Step 6 Repair circuit

1440 as

necessary,

recheck and

verify repair.

6. 1. With the ignition switch in the OFF position, disconnect

throttle relaxer connector Y38.

2. Disconnect all cables from the throttle relaxer pulleys.

Refer 6C3-3 SERVICE OPERATIONS.

3. Rotate pulleys on the throttle relaxer by hand fully then

release, allowing the pulleys to return to the stop.

Repeat this procedure three times.

4. Check resistance between the throttle relaxer

terminals X1-A and X1-B (refer to NOTE 1 above).

Is the resistance within the range as specified?

0.5 – 10

Ohms Go to Step 7 Replace the

throttle relaxer

assembly, refer

to 6C3-3

SERVICE

OPERATIONS.

Recheck and

verify repair

7. 1. With the throttle relaxer connector Y38 disconnected,

disconnect throttle relaxer control module connector

A111.

2. Check resistance of circuit 560 (Red/White wire)

between connector A111 terminals X1-22 and

connector Y38 terminal X1-A (refer to NOTE 1 above).

Is resistance value as specified?

0 – 5 Ohms Go to Step 8 Repair open in

circuit 560,

recheck and

verify repair.

8. 1. With the throttle relaxer connector Y38 disconnected,

disconnect throttle relaxer control module connector

A111.

2. Check resistance of circuit 560 (Red/White wire)

between connector A111 terminal X1-49 and

connector Y38 terminal X1-A (refer to NOTE 1 above).

Is resistance value as specified?

0 – 5 Ohms Go to Step 9 Repair open in

circuit 560,

recheck and

verify repair.

9. 1. W ith the throttle relaxer connector Y38 and the throttle

relaxer control module connector A111 disconnected,

check resistance of circuit 561 (Red/Black wire)

between connector A111 terminal X1-26 and

connector Y38 terminal X1-B (refer to NOTE 1 above).

Is resistance value as specified?

0 – 5 Ohms Go to Step 10 Repair open in

circuit 561,

recheck and

verify repair.

10. 1. W ith the throttle relaxer connector Y38 and the throttle

relaxer control module connector A111 disconnected,

check resistance of circuit 561 (Red/Black wire)

between connector A111 terminal X1-53, and

connector Y38 terminal X1-B (refer to NOTE 1 above).

Is resistance value as specified?

0 – 5 Ohms Go to Step 11 Repair open in

circuit 561,

recheck and

verify repair.

STEP ACTION VALUE YES NO

11. 1. Reconnect the throttle relaxer connector Y38.

2. Check resistance between the throttle relaxer control

module connector A111, terminals X1-22, circuit 560

(Red/White wire) and X1-28, circuit 450 (Black/Red

wire) on the throttle relaxer control module connector

A111 (refer to NOTE 1 above).

Is resistance value as specified?

Infinite ohms

(Open

Circuit)

Go to Step 12 Repair short to

ground in circuit

560, recheck

and verify repair.

12. 1. Check resistance between the throttle relaxer control

module connector A111, terminals X1-26, circuit 561

(Red/Black wire) and X1-28, circuit 450 (Black/Red

wire) on the throttle relaxer control module connector

A111 (refer to NOTE 1 above).

Is resistance value as specified?

Infinite ohms

(Open

Circuit)

Go to Step 13 Repair short to

ground in circuit

561, recheck

and verify repair.

13. 1. Reconnect the throttle relaxer control module

connector A111.

2. Disconnect the throttle relaxer connector Y38.

3. Turn the ignition switch to the ON position.

4. Using a DMM set to Volts DC, check voltage at

connector Y38, terminal X1-A, circuit 560 (Red/White

wire) (refer to NOTE 1 above).

Is voltage as specified?

Greater than

1 Volt Repair short to

voltage in circuit

560, recheck

and verify repair.

Go to Step 14

14. 1. With the throttle relaxer connector Y38 disconnected,

and the ignition switch in the ON position, check

voltage at connector Y38, terminal X1-B, circuit 561

(Red/Black wire) and terminal X1-28 of connector

A111 (refer to NOTE 1 above).

Is voltage as specified?

Greater than

1 Volt Repair short to

voltage in circuit

561, recheck

and verify repair.

Replace throttle

relaxer control

module, refer

3.9 THROTTLE

RELAXER

CONTROL

MODULE in this

Section.

Recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 66 – THROTTLE RELAXER CONTROL FAULT

CIRCUIT DESCRIPTION:

DTC 66 is a throttle position control failure that is most likely due to a mechanical fault caused by a jammed or

binding throttle relaxer motor, throttle cable. DTC 66 can only be detected when the ABS/TCS control module is

modulating (or attempting to modulate) the throttle position.

If the throttle relaxer con trol module is unable to adjust the throttle p osition, as requested by the ABS/TCS control

module, via the requested throttle position line (DKR), the throttle relaxer control module will try to reduce the

throttle o pening b y inc reasing th e current sup plied to the thro ttle relaxer . This curr ent will rise to a maxim um value

and if it sta ys there f or m ore th an thr ee seco nds, a m essage is se nt to th e AB S/TCS c ontr ol m odule a nd a D TC 66

is set.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC O FF warn ing displa y will b e activated and t he relevant DTC will be set. T he TRAC O FF warnin g displa y

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

ACTION:

If DTC 66 sets, visually and physically check the following components:

• Check accelerator pedal, throttle and (if fitted) cruise control cables for binding or fouling.

• Remove the accelerator pedal, throttle and (if fitted) cruise control cables from the throttle relaxer. Check

operation of the throttle relaxer pulleys to ensure they rotate freely without binding or sticking.

Repair or replace components as necessary. Ensure all cables are routed correctly. Clear all DTCs and verify

correct operation.

NOTE 1: The throttle relaxer is a non serviceable component. If the throttle relaxer pulleys are found to be faulty,

replace the thrott le r elax er as s em bly.

NOTE 2: To remove, reinstall and adjust the cables and throttle relaxer assembly, refer to

Section 6C3-3 SERVICE O PERATIONS – GEN III V8.

DTC 68 – THROTTLE POSITION SENSOR MONITORING FAULT

Figure 5B-169

CIRCUIT DESCRIPTION:

The ABS/T CS contro l module m onitors the throt tle po sition, when set by the thro ttle relax er control m odule, vi a the

actual throttle position (DKI) input, circuit 464 (Black/White wire). At the same time, the ABS/TCS control module

monitor s the throttle pos ition, as r ead by the Throttl e Position Se nsor (T PS), and comm unicated on the s erial data

line (circuit 1061, Green/White wire) by the PCM/PIM, via the Body Control Module and the UART Primary serial

data (circuit 800). If the values from the two inputs do not correlate with each other, the ABS/TCS control module

will set DTC 68.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC O FF warn ing displa y will b e activated and t he relevant DTC will be set. T he TRAC O FF warnin g displa y

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 68.

1. Determines if fault is related to the ABS/TCS system of the powertrain management system.

2. Checks if ABS/TCS control module is receiving the correct signal.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS.

2. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

A111 A37

Figure 5B-170

DTC 68 – THROTTLE POSITION SENSOR MONITORING FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Install Tech 2 to the DLC (refer NOTE 2 above).

2. Select Diagnosis / Engine / GEN III V8 / Diagnostic

Trouble Codes / Read DTC Info Ordered Priority.

Are any PCM DTCs set?

Rectify fault

ca usi ng PC M

DTC to set, refer

to 6C3-2A

DIAGNOSTIC

TABLES - GEN

III V8.

Go to Step 3

3. 1. With the throttle relaxer control module connector

A111 installed, Back probe ABS/TCS control module

connector A37, terminal X1-27, circuit 464 (Black/

White wire) with a volt meter to ground (refer NOTE 1

above).

2. Turn ignition ON.

3. Vary the position of the throttle opening, while taking

note of voltage reading.

Is voltage as specified?

Throttle

closed -

approx. 1

Volt

WOT

approx. 10

Volts

Replace

ABS/TCS control

module, refer

3.6 CONTROL

MODULE,

in this Section.

Recheck and

verify repair.

Replace throttle

relaxer control

module, refer

3.9 THROTTLE

RELAXER

CONTROL

MODULE

in this Section.

Recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 72 - SERIAL DATA FAULT

Figure 5B-171

CIRCUIT DESCRIPTION:

W ith the ignition ON, the ABS/T CS control module will be ab le to comm unicate with other control m odules via the

UART, Secondary (UART_SCD) serial data lines, on circuit 1061 (Green/White wire). If communication between

the modules is disrupted due to a short or open circuit, DTC 72 will be set.

If the ABS/T CS control m odule senses this f ault, only the TC S system will be disabled (ABS op eration will o perate

normally), the TRAC OFF warning display will be activated and the relevant DTC will be set. The TRAC OFF

warning disp lay will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control

module will enable the system at the next ignition cycle and the relevant history DTC will be set.

There are a number of control modules that are connected to this serial data circuit (BCM, ABS/TCS, A/C Blower

Motor, Telematics and the Instrument). Any of these c ontrol modules could caus e a fault in the UART_SCD serial

data line. This fault could result in Tech 2 not being able to display serial data.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 72.

1. This test determines if fault is current or not.

2. This test checks for connector or wiring problems which may cause an intermittent fault.

3. Determines if fault is in wiring or ABS/TCS control module.

4. Determines if fault is with BCM serial data communication (bus master).

5. Checks if fault is caused by other control modules that are communicating on the serial data line.

6. Checks circuit 1061 and determines if fault is in wiring or control module.

7. Checks for continuity in circuit 1061.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS.

2. Refer to 4.7 TECH 2 DIAGNOSTICS in this Section for connecting and using Tech 2.

DIAGNOSTIC AIDS:

A fault with the s erial da ta circ uit could b e caused by one or m ore of the s everal control m odules c onnected to the

serial data c ircuit. Is olate the f ault by disconn ecting ea ch controll er one at a tim e until seria l data com munication is

restored.

A37 A15 X1 A15 X2

Figure 5B-172

DTC 72 – SERIAL DATA FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Install Tech 2 to DLC.

2. Select Diagnostics / Chassis / ABS/TCS / Diagnostic

Trouble Codes / Clear DTCs and clear all DTCs (refer

to NOTE 2 above).

3. Road test vehicle.

Does DTC 72 set again ?

NOTE: Go to Step 4 if Tech 2 will not communicate with

the ABS/TCS control module.

Go to Step 4 Go to Step 3

STEP ACTION VALUE YES NO

3. 1. Inspect all system wiring and connections that could

cause intermittent faults. Check all wiring is in good

condition, terminals are clean and tight and making

good contact (refer NOTE 1 above).

Is wiring OK?

NOTE: Other control modules (SRS, Instruments, OCC,

BCM, PCM) that are connected to the serial data circuit

could cause DTC 72 to set. Therefore, check wiring and

connectors that could cause intermittent faults at these

control modules as well.

Fault not

present. Check

all system w iring

harness

connect ors and

terminals, in

particular the

modulator and

ABS/TCS control

module

connector

terminals.

Make rep airs as

necessary,

recheck and

verify repair.

In step 1, was Tech 2 able to communicate with the

ABS/TCS control module (refer NOTE 2 above)?

(With the ignition ON and Chassis / ABS/TCS selected,

Tech 2 should display the ABS/TCS control module part

number, system identif ic ation and actual system .)

Go to Step 5 Replace

ABS/TCS control

module, refer

3.6 CONTROL

MODULE,

in this Section.

Recheck and

verify repair.

5. 1. With Tech 2 connected, select Diagnostics / Body /

Body Control Module and turn ignition on as requested

(refer NOTE 2 above).

Does Tech 2 display BCM system identification information

(BCM level and type) ?

Go to Step 6 Refer to BCM

Serial Data

Communication

diagnostics in

12J BODY

CONTROL

MODULE.

6. 1. Using Tech 2, check for similar DTCs (Serial Data

faults) that have been set by other control modules;

instruments, SRS, and OCC if applicable to model

variant (refer NOTE 2 above).

Have similar DTCs been set by other control modules?

Go to Step 7 Go to Step 8

7. 1. Check circuit 1061 (Green/White wire) for open, short

to ground or short to voltage between BCM and the

following modules; Instrument (P3), A/C Blower Motor

(A14) and ABS/TCS (A37) (refer NOTE 1 above).

Is circuit 1061 OK ?

NOTE: Disconnect each controller in circuit 1061, one at a

time, to isolate the fault in the circuit or to identify control

module causin g fault.

Replace faulty

module, refer to

relevant Section

in the MY 2003

VY and V2

Series Service

Information,

recheck and

verify repair.

Make rep airs as

necessary,

recheck and

verify repair.

8. 1. Disconnect BCM connector A15 and ABS/TCS control

module connector A37.

2. Check for continuity between BCM connector A15

terminal X2-9 and ABS/TCS control module connector

A37, terminal X2-11, circuit 1061 (Green/White wire)

(refer to NOTE 1 above).

Does continu ity ex ist?

Replace

ABS/TCS control

module, refer

3.6 CONTROL

MODULE,

in this Section.

Recheck and

verify repair.

Check and

repair open in

circuit 1061

between BCM

and ABS/TCS

control modu le,

recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

DTC 73 – SPARK RETARD MONITORING FAULT

Figure 5B-173

CIRCUIT DESCRIPTION:

Spark retard is simultaneously controlled by the ABS/TCS control module and the PCM. The PCM supplies a 12

volt pull-up voltage. This voltage is monitored by the PCM, as the ABS/TCS control module requests spark retard

by pulling this vo ltage lo w.

The AB S/TC S contr ol m odule cont inual ly moni tors c ir cuit 1687 . If the ABS/T CS c ontrol m odule detects a c ontin uity

problem in circuit 1687 it will set a DTC 73.

If the ABS/T CS contro l module sens es this f ault, only the T CS system will be dis abled (ABS will operate n orm ally),

the TRAC O FF warn ing displa y will b e activated and t he relevant DTC will be set. T he TRAC O FF warnin g displa y

will remain activated for the remainder of the ignition cycle. If the failure is intermittent, the control module will

enable the system at the next ignition cycle and the relevant history DTC will be set.

TEST DESCRIPTION:

The numbers below refer to Step numbers in the diagnostic chart for DTC 73.

1. Checks for 12 volt pull up from PCM.

2. Checks for short to voltage in circuit 1687.

3. Checks for open and short to ground in circuit 1687.

NOTES ON DIAGNOSTIC CHART:

1. For all wiring checking procedures, refer to Section 12P WIRING DIAGRAMS.

2. Refer to GEN III V8 PCM Pow ertrain OBD System Check, in Secti on 6C3-2 A DIAGNOST IC TABLE S – GEN

III V8, before replacing PCM.

A84 V8 X2 A37

Figure 5B-174

DTC 73 – SPARK RETARD MONITORING FAULT

STEP ACTION VALUE YES NO

1. Was the ABS or ABS/TCS Functional Check Carried out? Go to Step 2 Go to 5.4 ABS or

ABS/TCS

Functional

Check

2. 1. Disconnect ABS/TCS control module connector A37.

2. Start engine.

3. Check voltage at ABS/TCS control module connector

A37, terminal X1-28, circuit 1687 (Grey/Black wire).

Is voltage as specified?

Battery + Go to Step 3 Go to Step 4

3. 1. With connector A37 disconnected, disconnect the

PCM connector A84-X2.

2. Turn ignition ON.

3. Check circuit 1687 for short to voltage at terminal X2-

53 (refer to NOTE 1 above).

Is circuit 1687 OK?

Replace

ABS/TCS control

module, refer

3.6 CONTROL

MODULE

in this Section.

Recheck and

verify repair.

Repair short to

voltage in circuit

1687, recheck

and verify repair.

4. 1. With connector A37 disconnected, disconnect the

PCM connector A84-X2.

2. Turn ignition OFF.

3. Check circuit 1687 for an open of short to ground at

terminal X2-53 (refer NOTE 1 above).

Is circuit 1687 OK?

Check and, if

necessary,

replace PCM.

Refer 6C3-3

SERVICE

OPERATIONS.

Repair short to

ground or open

in circuit 1687,

recheck and

verify repair.

WHEN ALL DIAGNOSIS AND REPAIRS ARE COMPLETED, CLEAR ALL DTCs AND VERIFY CORRECT OPERATION

6. SPECIFICATIONS

WHEEL SPEED SENSORS

Winding resistance at ambient temperature

Front wheels............................................................ 1600 - 1800 Ohms

Rear wheels ............................................................ 1440 - 1760 Ohms

Wheel speed sensor air gap ...................................... Non-adjustable

Wheel speed sensor pulse rings................................ 48 teeth

Brake Fluid ................................................................. Super Dot 4

Control Module........................................................... ABS and ABS/TCS control modules are not

interchangeable. If replacing an ABS or an

ABS/TCS control module, always refer to the

latest PartFinder® Parts Catalogue for the correct part.

7. TORQUE WRENCH SPECIFIC ATIONS

Brake line connection ........................................................... 8 – 11

Control module to hydraulic modulator................................. 3

Hydraulic modulator and control module securing nut ......... 5 – 12

Rear wheel speed sensor attaching screw........................... 6 – 14

Road wheel attaching nuts ................................................... 110 – 140

8. SPECIAL TOOLS

TOOL NUMBER ILLUSTRATION DESCRIPTION CLASSIFICATION

7374

SLIDE HAMMER & PLATE

Used to remove inner axle shafts from

the final drive assembly

Desirable

3588

DIGITAL MULTIMETER

Also Previously released as J39200 (or

use commer cia l equiv al ent).

NOTE: The instrument must have 10

Megohms im pedance and be capable

of reading frequencies.

Available

J35616-A

CONNECTOR ADAPTOR KIT

Used when carrying out electrical

diagnost ic cir cui t chec ks.

Desirable

TECH 2

DIAGNOSTIC SCAN TOOL

Previously released.

Mandatory