SECTION 5A - ANTI-LOCK BRAKE

CONTROL SYSTEM

Service Precaution

General Description

EHCU, Brake Pipe Diagram

Hydraulic Unit (H/U)

Normal Braking

Pressure Isolation (Pressure Maintain)

Pressure Reduction

Brake Release

Circuit Diagram

Connector List

Part Location

EHCU Pin-outs

System Components

Electronic Hydraulic Control Unit (EHCU)

ABS Warning Lamp

Wheel Speed Sensor (WSS)

G-Sensor

Normal and Anti-lock Braking

Electronic Brake-force Distribution (EBD)

System

Brake Pedal Travel

Acronyms and Abbreviations

General Diagnosis

General Information

ABS Service Precautions

Computer System Service Precautions

General Service Precautions

If The Battery Has Been Discharged

Note on Intermittent Failures

Test Driving ABS Complaint Vehicles

"ABS and Brake" Warning Lamp

Brake (EBD) Warning Lamp

Tech 2 Scan Tool

DATA LIST (Tech 2)

Actuator Test (Tech 2)

Diagnostic Trouble Codes

Diagnosis By "ABS" Warning Lamp

Illumination Pattern

Basic Diagnostic Flow Chart

Basic Inspection Procedure

1. Basic Inspection of Service Brake

2. Ground Inspection

Wheel Speed Sensor Inspection Procedure

Symptom Diagnosis

ABS Works Frequently But Vehicle Does Not

Decelerate

Uneven Braking Occurs During ABS Operation

The Wheels Are Locked

Abnormal Brake Pedal Feel

Operating Sound Is Heard From EHCU When

Brakes Are Not Applied

No ABS Warning Lamp

DTC C0221 (Flash Code 21) Front Right Wheel

Speed Sensor Short Circuit or Circuit Open

DTC C0222 (Flash Code 22) Front Right Wheel

Speed Sensor Incorrect Signal

DTC C0223 (Flash Code 23) Front Right Wheel

Speed Sensor Signal - Tooth Chipping

DTC C0225 (Flash Code 25) Front Left Wheel

Speed Sensor Short Circuit or Circuit Open

DTC C0226 (Flash Code 26) Front Left Wheel

Speed Sensor Incorrect Signal

DTC C0227 (Flash Code 27) Front Left Wheel

Speed Sensor Signal - Tooth Chipping

DTC C0231 (Flash Code 31) Rear Right Wheel

Speed Sensor Short Circuit or Circuit Open

DTC C0232 (Flash Code 32) Rear Right

Wheel Speed Sensor Incorrect Signal

DTC C0233 (Flash Code 33) Rear Right Wheel

Speed Sensor Signal - Tooth Chipping

DTC C0235 (Flash Code 35) Rear Left Wheel

Speed Sensor Short Circuit or Circuit Open

DTC C0236 (Flash Code 36) Rear Left Wheel

Speed Sensor Incorrect Signal

DTC C0237 (Flash Code 37) Rear Left Wheel

Speed Sensor Signal - Tooth Chipping

DTC C0238 (Flash Code 38) Tire Diameter Error

DTC C0241 (Flash Code 41) Front Right Isolation

Solenoid Circuit Open or Shorted to Ground

DTC C0242 (Flash Code 42) Front Right Dump

Solenoid Circuit Open or Shorted to Ground

DTC C0243 (Flash Code 43) Front Right Isolation

Solenoid Circuit Shorted to Battery

DTC C0244 (Flash Code 44) Front Right Dump

Solenoid Circuit Shorted to Battery

DTC C0245 (Flash Code 45) Front Left Isolation

Solenoid Circuit Open or Shorted to Ground

DTC C0246 (Flash Code 46) Front Left Dump

Solenoid Circuit Open or Shorted to Ground

DTC C0247 (Flash Code 47) Front Left Isolation

Solenoid Circuit Shorted to Battery

DTC C0248 (Flash Code 48) Front Left Dump

Solenoid Circuit Shorted to Battery

DTC C0251 (Flash Code 51) Rear Isolation

Solenoid Circuit Open or Shorted to Ground

DTC C0252 (Flash Code 52) Rear Dump

Solenoid Circuit Open or Shorted to Ground

DTC C0253 (Flash Code 53) Rear Isolation

Solenoid Circuit Shorted to Battery

DTC C0254 (Flash Code 54) Rear Dump

Solenoid Circuit Shorted to Battery

DTC C0265 (Flash Code 65) Fail Safe Relay

(FSR) shorted to Ground

DTC C0266 (Flash Code 66) Fail Safe Relay

(FSR) shorted to Battery

DTC C0267 (Flash Code 67) ABS Motor

shorted to Ground

DTC C0268 (Flash Code 68) ABS Motor

shorted to Battery

DTC C0271 (Flash Code 71) ECU Failure or

Valve +B Circuit Open

DTC C0274 (Flash Code 74) ABS Operation

Long Time

DTC C0276 (Flash Code 76) G-Sensor Malfunction

DTC C0277 (Flash Code 77) Power Supply

Low Input

DTC C0278 (Flash Code 78) Power Supply

High Input

DTC C0282 (Flash Code 82) 4 Wheel Drive

State Input Signal Failure

DTC C0285 (Flash Code 85) Assembly

Error (G-sensor)

Special Tools

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL

RESTRAINT SYSTEM (SRS). REFER TO THE SRS

COMPONENT AND WIRING LOCATION VIEW IN

ORDER TO DETERMINE WHETHER YOU ARE

PERFORMING SERVICE ON OR NEAR THE SRS

COMPONENTS OR THE SRS WIRING. WHEN YOU

ARE PERFORMING SERVICE ON OR NEAR THE

SRS COMPONENTS OR THE SRS WIRING, REFER

TO THE SRS SERVICE INFORMATION. FAILURE TO

FOLLOW WARNINGS COULD RESULT IN

POSSIBLE AIR BAG DEPLOYMENT, PERSONAL

INJURY, OR OTHERWISE UNNEEDED SRS SYSTEM

REPAIRS.

CAUTION: Always use the correct fastener in the

proper location. When you replace a fastener, use

ONLY the exact part number for that application.

HOLDEN will call out those fasteners that require a

replacement after removal. HOLDEN will also call

out the fasteners that require thread lockers or

thread sealant. UNLESS OTHERWISE SPECIFIED,

do not use supplemental coatings (Paints, greases,

or other corrosion inhibitors) on threaded fasteners

or fastener joint interfaces. Generally, such

coatings adversely affect the fastener torque and

the joint clamping force, and may damage the

fastener. When you install fasteners, use the

correct tightening sequence and specifications.

Following these instructions can help you avoid

damage to parts and systems.

General Description

A 3-Channel Sumitomo Anti-lock Brake System (ABS) is available for selected MY2003 TF Rodeo Models.

An Electronic Hydraulic Control Unit (EHCU) controls the ABS (Anti-lock Brake System) and the EBD (Electronic

Brake-force Distribution System). The ABS works on all four wheels, where as the EBD system works on only the two

rear wheels.

By continuously monitoring wheel speed sensor input signals and brake pedal application, the EHCU can determine

when a wheel is about to stop turning and adjust brake pressure to maintain both vehicle stability and braking

efficiency.

Important: Ensure the correct EHCU type (2WD Model or 4WD Model) is fitted, whenever the EHCU is replaced.

C05L300010

Legend

(1) Electronic (6) Front Left Wheel Speed Sensor

(2) Hydraulic (7) Rear Right Wheel Speed Sensor

(3) Hydraulic Unit (H/U) (8) Rear Left Wheel Speed Sensor

(4) Control Unit (9) G-sensor (4WD only)

(5) Front Right Wheel Speed Sensor (10) 2-4WD Control Unit (4WD only)

EHCU, Brake Pipe Diagram

C05L300011

Legend

(1) Front Right Brake Port (out) (4) Front Brake Port (in)

(2) Front Left Brake Port (out) (5) Rear Brake Port (in)

(3) Rear Brake Port (out)

Hydraulic Unit (H/U)

C05L300004

Legend

(1) Brake Pedal (5) Dump Valve

(2) Master Cylinder (6) Buffer Chamber

(3) Motor and Pump (7) Brake Caliper

(4) Isolation Valve

Normal Braking

During normal (non anti-lock) braking, the solenoid valves are de-energised. Spring force keeps the dump valve closed

and the isolation valve open.

Brake fluid travels through the center of the isolation valve (normally open) around the dump valve (normally closed)

then to the brake pistons.

C05L300012

Pressure Isolation (Maintain Pressure)

The electronic-hydraulic control unit is activated when the brakes are applied.

If the information from the wheel speed sensors indicates excessive wheel deceleration (imminent lockup), the first

step in the anti-lock sequence is to isolate the brake pressure being applied by the brake pedal.

The microprocessor in the Control Unit sends a voltage signal to the coil to energise and close the isolation valve. This

effectively isolates the wheel brake unit from the rest of the brake system, preventing any increase in brake application

force.

C05L300013

Pressure Reduction

Once the wheel brake unit is isolated, the brake pressure is reduced to allow the wheel speed to increase. This is

accomplished by dumping a portion of the brake fluid pressure into a “buffer” chamber.

The microprocessor energises the normally closed dump valve solenoid, allowing fluid from the wheel to be dumped

into the buffer chamber. This is done with very short activation pulses opening and closing the dump valve

passageway. Brake pressure is reduced at the wheel and allows the wheel to begin rotating again. The fluid from the

brake piston is stored in the buffer chamber against spring pressure and a portion of this fluid also primes the pump.

C05L300014

Brake Release

At the end of the anti-lock stop, when the brake pedal is released, the pump will remain running for a short time to help

drain any fluid from the buffer chamber. As this fluid returns into the system, the buffer spring forces the piston back to

its original position.

The isolation valve opens and fluid may return to the master cylinder. Conventional braking is then resumed.

C05L300015

Circuit Diagram

RTW45AXF000101-a

Connector List

No. Connector face No. Connector face

B-23

Green

Meter-A

C-44

White

Stop Light Switch

B-24

Green

Meter-B

C-53

Orange

ABS Sensor Front-RH

B-48

Black

G-sensor

C-54

Orange

ABS Sensor Front-LH

B-54

White

C-67

Black

EHCU

B-56

White

J/B I4

C-107

White

J/B E2

B-58

Black

Data Link Connector

C-108

White

J/B E1

B-62

White

Ignition Switch (IGSUB : G1)

C-109

Silver

Body-LH ; Ground

B-63

White

Ignition Switch (IGSUB : G2)

F-4

Gray

ABS Sensor Rear

C-2

Silver

Engine Room-RH ; ground

H-6

White

Engine Room ~ INST

C-36

Silver

Engine Room-LH ; Ground

H-7

White

Engine Room ~ INST

No. Connector face No. Connector face

H-15

White

Engine Room ~ Chassis

H-18

White

Engine Room ~ INST

P-2

Silver

Relay & Fuse Box

P-6

Silver

Body Earth (Ground)

P-10

Silver

Engine Ground

R-15

Black

2-4WD Control Unit

Part Location

RTW48AXF022101A

810L300006

EHCU Pin-outs

C05L300005

EHCU Side

Pin No.

(Harness

side

Pin No.)

Pin Function Wire

Color Typical Value Note

(C67-11) Power Supply WHT/GRN Battery Voltage Solenoid

(C67-10) Ground 1 BLK 0V

(Less than 0.1V) Solenoid, Control Unit

(C67-28) Ground 2 BLK 0V

(Less than 0.1V) Motor

(C67-27) Power Supply WHT/RED Battery Voltage Motor

(C67-9) Stop Light Switch RED Open : 0V

Close : Battery Voltage Close Condition :

Step on the Brake Pedal

(C67-8) Serial ORN/WHT - J1850 Class 2

Communication

(C67-7) Serial GRN - J1850 Class 2

Communication

(C67-6) Not Used - -

(C67-5) Not Used - -

(C67-4) G-Sensor Ground BLK 0V

(Less than 0.1V) 4WD Only

DTC C0276, C0285

(C67-3) Front Right Wheel Speed Sensor (-) GRY High Level: 1.28~2.28V

Low Level: 0.5~0.86V DTC C0221,C0222,

C0223

(C67-2) Front Right Wheel Speed Sensor (+) GRY/RED 12±1.5V DTC C0221,C0222,

C0223

(C67-1) Rear Right Wheel Speed Sensor (-) BLK High Level: 1.28~2.28V

Low Level: 0.5~0.86V DTC C0231,C0232,

C0233

EHCU Side

Pin No.

(Harness

side

Pin No.)

Pin Function Wire

Color Typical Value Note

(C67-17) ABS Warning Lamp YEL More than 10V

(C67-16) Not Used - -

(C67-15) Not Used - -

(C67-14) G-Sensor Signal YEL/BLK 2.0~3.0V

(MAX4.0V,MIN1.0V) 4WD Only - Check value

with vehicle on level

ground (0G:2.5V)

DTC C0276, C0285

(C67-13) Front Left Wheel Speed Sensor (+) RED 12±1.5V DTC C0225, C0226,

C0227

(C67-12) Rear Right Wheel Speed Sensor (+) ORN 12±1.5V DTC C0231,C0232,

C0233

(C67-26) EBD (Brake) Warning Lamp LT BLU More than 10V

(C67-25) Starter Switch ON

(Power Supply and Switch Position) BLU/WHT Battery Voltage Control Unit

DTC C0277,C0278

(C67-22) Not Used - -

(C67-23) Not Used - -

(C67-22) Not Used - -

(C67-21) Transfer (2-4WD Control Unit) GRY Pulse Signal

(High 4.5V, Low 1.5V) 4WD Only

DTC C0282

(C67-20) Front Left Wheel Speed Sensor (-) WHT High Level: 1.28~2.28V

Low Level: 0.5~0.86V DTC C0225, C0226,

C0227

(C67-19) Rear Left Wheel Speed Sensor (+) GRY/BLU 12±1.5V DTC C0235, C0236,

C0237

(C67-18) Rear Left Wheel Speed Sensor (-) WHT/BLU High Level: 1.28~2.28V

Low Level: 0.5~0.86V DTC C0235, C0236,

C0237

System Components

Electronic Hydraulic Control Unit (EHCU), four Wheel Speed Sensors, two Warning Lamps, and G-sensor.

Electronic Hydraulic Control Unit (EHCU)

The EHCU consists of ABS control circuits, fault detector, and a fail-safe system. The EHCU controls the motor that

drives the hydraulic unit according to the signal from each wheel speed sensor, cancelling ABS to return to normal

braking when a malfunction has occurred in the ABS.

The EHCU has a self-diagnostic function to aid the Technician during fault diagnosis.

The EHCU is mounted on the engine compartment rear left side. It consists of a motor, solenoid valves and a fail-safe

relay.

Solenoid Valves: Reduce or hold the caliper fluid pressure for each front brake or both rear brakes according to the

signal sent from the EHCU.

Buffer chamber: Temporarily holds the brake fluid that returns from the front and rear brake so that pressure of front

brake can be reduced smoothly.

Motor: Drives the pump according to the signal from EHCU.

Fail-safe Relay: When failure occurs in ABS, the relay will cut the power to the solenoid valves.

NOTE:

THE ELECTRONIC HYDRAULIC CONTROL UNIT (EHCU) IS SERVICED AS A COMPLETE UNIT. NO ATTEMPT

SHOULD BE MADE TO SEPARATE THE CONTROL UNIT FROM THE HYDRAULIC UNIT

ABS Warning Lamp

825L300001

Vehicles equipped with the Anti-lock Brake System have an amber “ABS” warning lamp in the instrument panel. The

“ABS” warning lamp will illuminate if a malfunction in the Anti-lock Brake System is detected

by the Electronic Hydraulic Control Unit (EHCU).

In case of an electronic malfunction, the EHCU will turn “ON” the “ABS” warning lamp and disable the anti-lock braking

function.

The “ABS” warning lamp will turn “ON” for approximately three seconds after the ignition switch is turned to the “ON”

position.

If the “ABS” warning lamp stays “ON” for longer than three seconds after the ignition switch is turned to the “ON”

position, or comes “ON” and stays “ON” while driving, the Anti-lock Brake System should be inspected for a

malfunction according to the diagnosis procedure.

Wheel Speed Sensor (WSS)

It consists of a sensor and a rotor. The sensor is attached to the knuckle on the front wheels and to the rear wheels.

The rotor is press-fit in the axle shaft.

G-Sensor

The G-sensor detects the vehicle deceleration speed and sends a signal to the EHCU. In 4WD operation, all four

wheels may be decelerated in almost the same phase, since all wheels are connected mechanically.

This tendency is noticeable particularly on roads with low friction coefficient, and the ABS control is adversely affected.

The G-sensor judges whether the friction coefficient of road surface is low or high, and changes the EHCU's operating

system to ensure ABS and EBD control.

Normal and Anti-lock Braking

Under normal driving conditions, the Anti-lock Brake System functions the same as a standard power assisted brake

system. However, with the detection of wheel lock-up, a slight bump or kick-back will be felt in the brake pedal. This

pedal “bump” will be followed by a series of short pedal pulsations which occurs in rapid succession. The brake pedal

pulsation will continue until there is no longer a need for the anti-lock function or until the vehicle is stopped. A slight

ticking or popping noise may be heard during brake applications when the anti-lock feature is being used.

When the anti-lock feature is being used, the brake pedal may rise even as the brakes are being applied. This is also

normal. Maintaining a constant force on the pedal will provide the shortest stopping distance.

Electronic Brake-force Distribution (EBD) System

ABS has the EBD function. EBD is a function, which controls braking force distribution of a front wheel and a rear

wheel, and makes brake fluid pressure of a rear wheel the optimal. If the rate of a slip of a rear wheel becomes large

more than fixed compared with a front wheel about the rate of a slip in order to perform braking force distribution of a

front wheel and a rear wheel, the brake fluid pressure of a rear wheel will be controlled. EBD enables it to always

utilize the braking power of a rear wheel for the maximum according to the load change concerning the back axis by

vehicles loading states (No luggage, loading, etc.), deceleration, etc. Brake fluid pressure control to a rear wheel is

performed by the EBD function, which uses the ABS function without the mechanical proportioning valve.

C05L300016

Brake Pedal Travel

Vehicles equipped with the Anti-lock Brake System may be stopped by applying normal force to the brake pedal.

Although there is no need to push the pedal beyond the point where it stops or holds the vehicle, by applying more

force the pedal will continue to travel toward the floor.

This extra brake pedal travel is normal.

Acronyms and Abbreviations

Several acronyms and abbreviations are commonly used throughout this section:

ABS

Anti-lock Brake System

CKT

Circuit

DLC

Data Link Connector

EBD

Electronic Brake-force Distribution

EHCU

Electronic Hydraulic Control Unit

Front Left

Front Right

GEN

Generator

H/U

Hydraulic Unit

Millivolts

Rear

RPS

Revolution per Second

VDC

DC Volts

VAC

AC Volts

W/L

Warning Lamp

WSS

Wheel Speed Sensor

General Diagnosis

General Information

ABS failures can be classified into two types, those which can be detected by the ABS warning lamp and those which

can be detected as a vehicle abnormality by the driver.

In either case, locate the fault in accordance with the “BASIC DIAGNOSTIC FLOWCHART” and repair.

Please refer to Section 5C for the diagnosis of mechanical troubles such as brake noise, brake judder (brake pedal or

vehicle vibration felt when braking), uneven braking, and parking brake trouble.

ABS Service Precautions

Required Tools and Items:

• Box Wrench

• Brake Fluid

• Special Tool (Some diagnosis procedures in this section require the installation of a special tool)

• 5-8840-0366-0 High Impedance Multimeter -When circuit measurements are requested, use a circuit tester with

high impedance.

Computer System Service Precautions

The Anti-lock Brake System and Electronic Brake-force Distribution interfaces directly with the Electronic Hydraulic

Control Unit (EHCU) which is a control computer that is similar in some regards to the Engine Control Module. These

modules are designed to withstand normal current draws associated with vehicle operation. However, care must be

taken to avoid overloading any of the EHCU circuits. In testing for opens or shorts, do not ground or apply voltage to

any of the circuits unless instructed to do so by the appropriate diagnostic procedure. These circuits should only be

tested with a high impedance multimeter 5-8840-0366-0 or special tools as described in this section. Power should

never be removed or applied to any control module with the ignition in the “ON” position. Before removing or

connecting battery cables, fuses or connectors, always turn the ignition switch to the “OFF” position.

General Service Precautions

The following are general precautions that should be observed when servicing and diagnosing the Anti-lock Brake

System and/or other vehicle systems. Failure to observe these precautions may result in Anti-lock Brake System and

Electronic Brake-force Distribution damage.

• If welding work is to be performed on the vehicle using an electric arc welder, the EHCU and valve block

connectors should be disconnected before the welding operation begins.

• The EHCU and valve block connectors should never be connected or disconnected with the ignition “ON”.

Note:

• If only rear wheels are rotated using jacks or drum tester, the system will diagnose a speed sensor malfunction

and the “ABS and Brake” warning lamp will illuminate. But actually no fault exists. When the DTC is not detected

and the ABS and BRAKE warning lamp is on, “Erase DTC procedure” is performed and ABS and BRAKE

warning lamps will then be extinguished.

If The Battery Has Been Discharged

The engine may stall if the battery has been completely discharged and the engine is started via jumper cables. This

is because the Anti-lock Brake System (ABS) and Electronic Brake-force Distribution (EBD) System requires a large

quantity of electricity. In this case, wait until the battery is recharged, or set the ABS and EBD to a non-operative state

by removing the fuse for the ABS. After the battery has been recharged, stop the engine and install the ABS fuse. Start

the engine again, and confirm that the ABS warning Lamp does not light.

Note on Intermittent Faults

As with virtually any electronic system, it is difficult to identify an intermittent failure. In such a case duplicating the

system malfunction during a test drive or a good description of vehicle behavior from the customer may be helpful in

locating a “most likely” failed component or circuit. The symptom diagnosis chart may also be useful in isolating the

failure. Most intermittent problems are caused by faulty electrical connections or wiring. When an intermittent failure is

encountered, check suspect circuits for:

• Suspected harness damage.

• Poor mating of connector halves or terminals not fully seated in the connector body (backed out).

• Improperly formed or damaged terminals.

Test Driving ABS Complaint Vehicles

In case that there has been an abnormality in the lighting pattern of the “ABS” warning lamp, the fault can be located in

accordance with the “DIAGNOSIS BY “ABS” WARNING LAMP ILLUMINATION PATTERN”. It is necessary to test

drive the vehicle following the test procedure mentioned below, in order to reproduce the symptom for fault diagnosis:

1. Start the engine and make sure that the “ABS” warning lamp goes OFF. If the warning lamp remains ON, it

means that the Diagnostic Trouble Code (DTC) is stored. Therefore, read the code and locate the fault.

Note: After initiating the DTC clearing procedure with Tech 2, the vehicle must be driven in excess of 6km/h (4mph) to

finally clear the DTC and extinguish the “ABS” warning lamp.

2. Start the vehicle and accelerate to about 30 km/h (19 mph) or more.

3. Slowly brake and stop the vehicle completely.

4. Then restart the vehicle and accelerate to about 40 km/h (25 mph) or more.

5. Brake with sufficient pedal force so as to actuate the ABS and stop the vehicle.

6. Be cautious of abnormality during the road test. If the warning lamp is actuated while driving, read the DTC and

locate the fault.

7. If the abnormality cannot be reproduced by the test drive, endeavour to reproduce the situation reported by the

customer.

8. If the abnormality has been detected, repair in accordance with the “SYMPTOM DIAGNOSIS” .

Note:

• Be sure to carryout the test drive on a wide, even road with little or no other traffic.

• If an abnormality is detected, immediately suspend the road test and commence fault diagnosis as soon as

practicable.

“ABS” Warning Lamp

Normal operation:

The “ABS” warning lamp will illuminate for about three seconds when the ignition is first turned ON, while the system

performs a self test.

Upon satisfactory completion of the self test, the “ABS” warning lamp will be extinguished. The “ABS” warning lamp

should remain OFF at all other times.

Fault detected:

Should a fault be detected during a self test, or an “ABS” failure occur whilst driving, the EHCU will illuminate the “ABS”

warning lamp and log the appropriate Diagnostic Trouble Code (DTC).

While the “ABS” lamp is illuminated, the anti-lock braking system is disabled, although power assisted braking is still

available.

Should on the next ignition cycle, the EHCU determine the fault is no longer present, the “ABS” warning lamp will

extinguish after the self test, but the DTC will remain in the EHCU memory until cleared by Tech 2.

Brake (EBD) Warning Lamp

825L300001

Vehicles equipped with the EBD (Electronic Brake-force Distribution) System have a “Brake” warning lamp in the

instrument panel.

If both the ABS warning lamp and Brake warning lamp are illuminated during normal driving, then EBD system has

failed. (Parking brake switch is "OFF")

Under the following conditions, EBD warning lamp is "ON".

• Starter switch is "ON", engine "OFF".

( Parking brake switch is "OFF")

If engine is started, then EBD warning lamp is "OFF". ( Parking brake switch is "OFF")

Tech 2 Scan Tool

901RW257

Legend

(1) PCMCIA Card (4) Tech–2

(2) SAE 16/19 Adaptor

(3) DLC Cable

Getting Started

• Before operating the Tech 2, the following steps

must be performed:

1. Insert the Holden LCV PCMCIA card into the

Tech 2.

2. Connect the SAE 16/19 adapter to the DLC

cable.

3. Connect the DLC cable to the Tech 2.

4. Ensure the vehicle ignition is ‘OFF’.

5. Connect the Tech 2 SAE 16/19 adapter to the

vehicle DLC.

060R300015

6. Turn the ignition ‘ON’.

7. Power up the Tech 2.

8. Verify the Tech 2 Power-up display.

060RW0009

Operating Procedure

The Power-up screen is displayed when you power

up the tester with the Holden LCV PCMCIA card.

Follow the operating procedure below.

060R100102

060L300001

DATA LIST (Tech 2)

The data displayed by DATA LIST are as follows:

Strings Units Description 2WD 4WD

Front Left Wheel Speed km/h (MPH)

Front Right Wheel Speed km/h (MPH)

Rear Left Wheel Speed km/h (MPH)

Rear Right Wheel Speed km/h (MPH)

Start the vehicle and make sure of linear

change in each wheel speed

Brake Switch Open/Closed Brake switch is “closed” when foot brake is

applied.

ABS Warning Lamp On/Off Normally “Off”

EBD Warning Lamp On/Off Normally “Off”

ABS Stop State On/Off Normally “Off”

ABS Relay Active/Inactive Normally “Active”

Return Pump Active/Inactive Normally “Inactive”

DTC Status No DTC Normally “No DTC”

4 Wheel Drive Status Yes/No Normally “Yes” -

FL Dump Valve Commanded

(Front Left) Active/Inactive

FL Isolation Valve Commanded

(Front Left) Active/Inactive

FR Dump Valve Commanded

(Front Right) Active/Inactive

FR Isolation Valve Commanded

(Front Right) Active/Inactive

Rear Dump Valve Commanded Active/Inactive

Rear Isolation Valve Commanded Active/Inactive

FL Dump Valve Feedback

(Front Left) Active/Inactive

FL Isolation Valve Feedback

(Front Left) Active/Inactive

FR Dump Valve Feedback

(Front Right) Active/Inactive

FR Isolation Valve Feedback

(Front Right) Active/Inactive

Rear Dump Valve Feedback Active/Inactive

Rear Isolation Valve Feedback Active/Inactive

Each valve is “Active” when valve is operated.

G-Sensor Output V 2.0~3.0V when vehicle speed is 0 km/h and

vehicle is on a level surface. -

Battery Voltage V EHCU supply voltage value

Diagnostics Connector Open/Closed Diagnostics connector is “Open” when

diagnostics connector is connected.

Actuator Test (Tech 2)

There are 5 different menus available for this test. Using these menus can test the state of each circuit. Especially

when DTC cannot be detected, a faulty circuit can be diagnosed by testing each circuit by means of these menus.

Even when DTC has been detected, the circuit tests using these menus could help discriminate between a mechanical

trouble and an electrical trouble.

In all cases follow these test conditions; Engine off with the key turned to the “ON” position, and the brake pedal

depressed after one depress and release.

• Engine: Off

• Ignition SW: ON

060L300002

ABS Check Light Test

Test condition: Engine off with the key turned to the “ON” position, and the brake pedal depressed after one depress

and release.

• The circuit is normal if the warning light (lamp) in the meter panel comes on and goes out in accordance with

Tech2’s instruction.

060L300002

Return Pump Test

Test condition: Engine off with the key turned to the “ON” position, and the brake pedal depressed after one depress

and release.

Confirm operation of return pump relay and return pump by listening for their working sound.

The circuit is normal if the working sound of the return pump relay and return pump are made in accordance with

Tech2’s instruction.

060L300002

Isolation Valve Test

Purpose: The purpose of this test is to detect brake pipe and valve line harness wire for incorrect connections and

valve trouble.

This test will help you confirm the result of your service repair, including the removal/reinstallation of brake pipe, valve

line harness and valve.

Test conditions: Engine off with the key turned to the “ON” position, and the brake pedal depressed after one depress

and release.

Test procedure:

1. Connect Tech 2 to the vehicle, and select Actuator Test from the menus.

2. Select a Solenoid Valve Test Menu from the Actuator Test Menus.

060L300002

3. Select Isolation Valve from the Valve Select Menus.

4. Step on the brake pedal.

5. Release the brake pedal.

6. Make sure that the Isolation Valve “ON” that has been selected with Tech 2, and the actual wheel locked position

are the same. If different, check brake pipe, valve line harness wiring and H/UNIT. Repair is needed if

abnormality is found.

7. Conduct Step 2 through Step 5 above on all the four wheels.

060L300002

CAUTION: When conducting this test, please observe the following cautions.

1. Do not start the engine.

2. Lift up the vehicle on a level floor.

• Secure a enough clearance from the floor surface to allow the lifted tire to rotate.

3. Maintain the lift up.

4. Wipe the floor surface to remove water and oil to prevent accidents.

5. Do not load the vehicle.

• When lifting up the vehicle, be sure to observe the lifting up points. Refer to vehicle lifting points in Section 0A.

Dump Valve Test

Purpose: The purpose of this test is to detect brake pipe and valve line harness wire for incorrect connections and

valve trouble.

This test will help you confirm the result of your service repair including the removal/reinstallation of brake pipe, valve

line harness and valve.

Test conditions: The ignition key is in the “ON” position with all four wheels lifted up. The brake pedal is depressed,

released and depressed again with the parking brake released.

Test procedure:

1. Connect Tech 2 to the vehicle, and select Actuator Test Function from the menus.

2. Select a Solenoid Valve Test Menu from the Actuator Test Menus.

060L300002

3. Select Dump Valve from the Valve Select Menus.

4. depress the brake pedal.

5. Make sure that the Dump Valve “ON” that has been selected with Tech 2, and the actual wheel released position

are the same. If different, check brake pipe, valve line harness wiring and H/UNIT. Repair is needed if

abnormality is found.

6. Conduct Step 2 through Step 5 above on all the four wheels.

060L300002

CAUTION: When conducting this test, please observe the following cautions.

1. Do not start the engine.

2. Lift up the vehicle at a level floor.

• Secure a clearance from the floor surface enough to allow the lifted tire to rotate.

3. Maintain the lift up.

4. Wipe the floor surface to remove water and oil so that the surface may become unslippery.

5. Do not load the vehicle.

• When lifting up the vehicle, be sure to observe the lifting up points. Refer to vehicle lifting points in Section 0A

Diagnostic Trouble Codes

Choose and follow the appropriate diagnostic flowchart by the numbers listed below to find fault and repair.

Note: DTC cannot be erased when the fault is present.

Warning Lamp System Control Main Items

DTC

(Flash

Code) Description ABS Brake

(EBD) ABS EBD

(12) Normal Condition × × -

C0221

(21) Front Right Wheel Speed Sensor Short

Circuit or Circuit Open ×*A × Sensor or Wiring

C0222

(22) Front Right Wheel Speed Sensor

Incorrect Signal *B ×A × Sensor or install condition

C0223

(23) Front Right Wheel Speed Sensor Signal

- Tooth Chipping ×*A × Sensor Rotor or install

condition

C0225

(25) Front Left Wheel Speed Sensor Short

Circuit or Circuit Open ×*A × Sensor or Wiring

C0226

(26) Front Left Wheel Speed Sensor

Incorrect Signal *B ×*A × Sensor or install condition

C0227

(27) Front Left Wheel Speed Sensor Signal -

Tooth Chipping ×*A × Sensor Rotor or install

condition

C0231

(31) Rear Right Wheel Speed Sensor Short

Circuit or Circuit Open ×*A × Sensor or Wiring

C0232

(32) Rear Right Wheel Speed Sensor

Incorrect Signal *B ×*A × Sensor or install condition

C0233

(33) Rear Right Wheel Speed Sensor Signal

- Tooth Chipping ×*A × Sensor Rotor or install

condition

C0235

(35) Rear Left Wheel Speed Sensor Short

Circuit or Circuit Open ×*A × Sensor or Wiring

C0236

(36) Rear Left Wheel Speed Sensor

Incorrect Signal *B ×*A × Sensor or install condition

C0237

(37) Rear Left Wheel Speed Sensor Signal -

Tooth Chipping ×*A × Sensor Rotor or install

condition

C0238

(38) Tire Diameter Error × × Vehicle , Sensor or Tyre

C0241

(41) Front Right Isolation Solenoid Circuit

Open or Shorted to Ground × × Solenoid (EHCU)

C0242

(42) Front Right Dump Solenoid Circuit

Open or Shorted to Ground × × Solenoid (EHCU)

C0243

(43) Front Right Isolation Solenoid Circuit

Shorted to Battery × × Solenoid (EHCU)

C0244

(44) Front Right Dump Solenoid Circuit

Shorted to Battery × × Solenoid (EHCU)

C0245

(45) Front Left Isolation Solenoid Open Or

Shorted to Ground × × Solenoid (EHCU)

C0246

(46) Front Left Dump Solenoid Circuit Open

Or Shorted to Ground × × Solenoid (EHCU)

C0247

(47) Front Left Isolation Solenoid Circuit

Shorted to Battery × × Solenoid (EHCU)

Warning Lamp System Control Main Items

DTC

(Flash

Code) Description ABS Brake

(EBD) ABS EBD

C0248

(48) Front Left Dump Solenoid Circuit

Shorted to Battery × × Solenoid (EHCU)

C0251

(51) Rear Isolation Solenoid Circuit Open or

Shorted to Ground × × Solenoid (EHCU)

C0252

(52) Rear Dump Solenoid Circuit Open or

Shorted to Ground × × Solenoid (EHCU)

C0253

(53) Rear Isolation Solenoid Circuit Shorted

to Battery × × Solenoid (EHCU)

C0254

(54) Rear Dump Solenoid Circuit Shorted to

Battery × × Solenoid (EHCU)

C0265

(65) Fail Safe Relay (FSR) Shorted to

Ground × × Motor (EHCU)

C0266

(66) Fail Safe Relay (FSR) Shorted to

Battery × × Relay (EHCU)

C0267

(67) ABS Motor Shorted to Ground × × Motor (EHCU)

C0268

(68) ABS Motor Shorted to Battery × × Motor (EHCU)

C0271

(71) ECU Failure or Valve +B Circuit Open × × EHCU

C0274

(74) ABS Operation Long Time × × EHCU

C0276

(76) G-Sensor Malfunction × × Sensor or Wiring

× × Battery, Wiring or EHCU

(less than 9V)

C0277

(77) Power Supply Low Input

× × Battery or Wiring

(less than 10V)

C0278

(78) Power Supply High Input × × Battery or Wiring EHCU

C0282

(82) 4 Wheel Drive State Input Signal Failure × × Wiring

C0285

(85) Assembly Error (G-sensor) × × Vehicle (Sensor or EHCU)

*A : When three or more faults are detected, or when faults containing both front wheels and each rear wheels are

detected, EBD warning lamp is "ON" and control is cancelled.

*B : IMPORTANT : The ABS lamp will remain “ON” after a repair until vehicle exceeds 6km/h in the next ignition cycle

and a fault is not detected.

Diagnosis By “ABS” Warning Lamp Illumination Pattern

In the event that there is abnormality in the “ABS” warning Lamp illumination pattern while the key is in the ON position

or if the warning Lamp is actuated during driving, faults should be diagnosed on a illumination pattern basis as follows:

No. Condition “ABS” Warning Lamp Illumination Pattern Diagnostic

1 Warning Lamp is

actuated normally

Normal

2 Warning Lamp is not

lit

Warning Lamp lighting circuit

trouble. Go to No ABS

Warning Lamp.

3 Warning Lamp

remains ON

Diagnostic trouble codes are

stored.

Display diagnostic trouble

codes and diagnose on a

code basis according to

the flow charts.

4 Warning Lamp is

actuated while driving

Diagnostic trouble codes are

stored.

Display diagnostic trouble

codes and diagnose on a

code basis according to

the flow charts.

Diagnostic Trouble Codes (DTCs)

When the warning lamp in the meter remains ON, the EHCU stores the fault identification number (Diagnostic

Trouble Code) and disables the ABS.

Displaying and Erasing DTCs:

TECH 2 is the preferred method of displaying DTCs. Should TECH 2 be unavailable, the following method may be

used to display '‘Flash Codes" via the ABS warning lamp.

1. Initiating DTC Flash Code display:

• Confirm that the vehicle is at a complete stop (wheels stationary) and that the brake pedal is not depressed.

(Unless these two conditions are met, Flash Codes cannot be displayed.)

• With IGN OFF, connect DLC #12 terminal with #4 terminal or # 5 terminal (GND). Then turn IGN ON.

350L300005

2.Reading the DTC Flash Code display:

• DTCs are displayed on the ABS warning lamp.

• All DTCs are a Double-digit display.

• First, normal DTC 12 is displayed three times and then any other DTCs are displayed three times. (If no

other DTCs have been stored, the display of DTC 12 will be repeated.)

3.Erasing DTC Flash Codes:

• Activate brake switch ON/OFF operation 6 or more times within 3 seconds of self-diagnosis startup.

• The code cannot be erased if more than 3 seconds have passed since self-diagnosis startup or if

self-diagnosis has started with brake switch on (brake depressed).

B05RW0005

Note:

• If, during Diagnostic Trouble Code (DTC) display, either a road wheel turns or the brake pedal is depressed,

the display will be discontinued and ABS control resumed.

• Up to 3 different codes can be stored.

• If the ABS should be disabled due to an intermittent fault, the system will be restored at the next key cycle,

providing the failure is not present during the initial self-check.

Example Flash Code Display - DTC 23

B05R100001

After displaying DTC 12 three times, one DTC after another is displayed. DTC’s are displayed in numerical order.

C05L300017

The DTC 12 is displayed repeatedly.

Basic Diagnostic Flow Chart

LTW35AMF000401

Step Action Value(s) Yes No

1 1. Ignition “ON,”engine “OFF.”

2. Observe the ABS warning lamp.

Note: When the starter switch is turned to the “ON”

position, the ABS warning lamp will turn on for 3

seconds then turn off.

Is the ABS warning lamp “ON”? - Go to Step 2

Go to “No

ABS

warning

lamp”

2 1. Ignition “OFF.”

2. Install Tech2.

3. Ignition “ON.”

4. Attempt to display ABS data with the Tech 2.

Does the Tech 2 display ABS data? - Go to Step 5 Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU.

2. Check the DLC (Data Link Connector) circuit for

an open, short to ground, or short to voltage.

Also, check the DLC ignition feed circuit for an

open or short to ground and the DLC ground

circuit for an open.

3. If a problem is found, repair as necessary.

as a problem found? - Go to Step 2 Go to Step 4

Step Action Value(s) Yes No

4 1. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open.

2. If a problem is found, repair as necessary.

Was a problem found? - Go to Step 2 Go to Step

5 Select “Display DTCs” with the Tech 2.

Are any DTCs stored? - Go to Step 6 Go to Step

6 Review and record for Tech 2 Failure Records data

and DTCs.

Is the action complete? - Go to Step 7 -

7 Following the DTC is stored.

Is this DTC C0271 stored?

Go to

applicable

DTC table

after Go to

step 8 Go to Step 8

8 Clear the DTCs by “Clear the Information“ with

Tech 2.

Did the DTCs cleared? - Go to Step 9 -

9 Select “Display DTCs” with the Tech 2.

Are any DTCs stored? -

Go to

applicable

DTC table Go to Step

10 Review and record for Tech 2 data.

Is the action complete?

Go to

Symptom

Diagnosis

and Go to

Basic

Inspection

Procedure -

11 Replace the EHCU.

Note: Check the EHCU type for specification, when

the EHCU is replaced.

(Specification; 2WD Model or 4WD Model)

Is the action complete? - Verify repair -

Basic Inspection Procedure

1. Basic Inspection of Service Brake

Step Action Value(s) Yes No

1 Is the fluid level normal?

- Go to Step 2

Replenish

with fluid

Go to Step 2

2 Does fluid leak? - Repair

Go to Step 3 Go to Step 3

3 Is the booster function normal? - Go to Step 4 Repair

Go to Step 4

4 Is the pad and rotor normal? - Go to Step 5 Repair

Go to Step 5

5 Reconnect all components. Ensure all component

are properly mounted.

Was this step completed? - Finished Go to Step 5

2. Ground Inspection

Step Action Value(s) Yes No

1 Are the ABS related ground points OK? - Go to Step 2 Repair

Go to Step 2

2 Reconnect all components. Ensure all components

are properly mounted.

Was this step completed? - Finished Go to Step 2

Wheel Speed Sensor Inspection Procedure

PROCEDURE

1. Ignition "OFF".

2. Disconnect the each wheel speed sensor.

3. Check the voltage at sensor harness connector.

Note : Voltage measurement is performed with the wheel speed sensor installed in the vehicle.

C05L300019

Connector Pin-outs

Front Wheel Speed Sensor

Pin 1(+) (+12V supply)

Pin 2 (-) (signal to EHCU)

Rear Wheel Speed Sensor

Pin 1 LH (+) (+12V supply)

Pin 2 LH (-) (signal to EHCU)

Pin 3 RH (+) (+12V supply)

Pin 4 RH (-) (signal to EHCU)

Expected Output Values

High State

1.28~2.2V

Low State

0.5~0.86V

High-Low

Difference

more than 0.8V

Symptom Diagnosis

The symptoms that cannot be indicated by warning lamp can be divided in the following five categories:

1. ABS works frequently but vehicle does not decelerate.

2. Uneven braking occurs while ABS works.

3. The wheels are locked.

4. Brake pedal feel is abnormal.

5. Braking sound (from EHCU) is heard while not braking.

6. No ABS Warning lamp

These are all attributable to problems that cannot be detected by EHCU self-diagnosis. Use the customer complaint

and a road test to determine which symptom is present.

ABS Works Frequently But Vehicle Does Not Decelerate

Step Action Value(s) Yes No

1 Is braking force distribution normal between front

and rear of vehicle?

- Go to Step 2

Repair or

Replace

brake

components.

Go to Step 7

2 Are the wheel speed sensors installed correctly?

- Go to Step 3

Repair axle

parts.

Go to Step 7

3 Is there play in each or any wheel speed sensor?

Repair wheel

speed

sensor.

Go to Step 7 Go to Step 4

4 Is there damage, or foreign material sticking to

each or any wheel speed sensor/sensor rotor?

Replace

wheel speed

sensor or

sensor rotor.

Go to Step 8 Go to Step 5

5 Is each wheel speed sensor output normal?

- Go to Step 6

Replace

wheel speed

sensor or

repair

harness.

Go to Step 7

6 Is the 4WD control system function normal?

2-4WD

Repair or Go

to Step 7

Repair or

replace 2-

4WD control

System.

Go to Step 7

7 Reconnect all components, ensure all components

are properly mounted.

Was this step finished? -

Repeat the

“Basic

diagnostic

flow chart” Go to Step 7

Uneven Braking Occurs During ABS Operation

Step Action Value(s) Yes No

1 Is there play in each or any wheel speed sensor? - Repair.

Go to Step 5 Go to Step 2

2 Is there damage or foreign material sticking to each

or any wheel speed sensor/sensor rotor? - Repair.

Go to Step 5 Go to Step 3

3 Is each sensor output normal?

Go to Step 4 Replace

sensor or

repair

harness.

Go to Step 5

4 Is brake pipe connecting order correct?

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced. -

Replace

EHCU.

Go to Step 5

Reconnect

brake pipe

correctly.

Go to Step 5

5 Reconnect all components, ensure all components

are properly mounted.

Was this step finished? -

Repeat the

“Basic

diagnostic

flow chart”

Go to Step 5

The Wheels Are Locked During Braking

Step Action Value(s) Yes No

1 Is ABS working? - Go to Step 2 Go to Step 4

2 Is vehicle speed under 5 km/h? - Normal. Go to Step 3

3 Is each wheel speed sensor output correct?

- Go to Step 4

Replace

sensor or

repair

harness.

Go to Step 6

4 Is 2-4WD system functioning correctly?

- Go to Step 5

Replace 2-

4WD control

unit or repair

harness.

Go to Step 6

5 Is EHCU grounded properly?

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Replace

EHCU.

Go to Step 6 Repair.

Go to Step 6

6 Reconnect all components, ensure all components

are properly mounted.

Was this step finished? -

Repeat the

“Basic

diagnostic

flow chart” Go to Step 6

Abnormal Brake Pedal Feel

Step Action Value(s) Yes No

1 Is the stop light actuated when the brake pedal is

depressed? - Go to Step 2 Go to Step 3

2 1. Turn the ignition switch off.

2. Disconnected EHCU connector.

Measure voltage between the EHCU connector

terminals 10 and 9 when brake pedal is depressed.

Is the voltage equal to battery voltage? - Go to Step 4

Harness NG

between

stop light SW

and EHCU.

Go to Step 6

3 Is stop light fuse normal?

- Go to Step 5

Replace stop

light fuse.

Go to Step 6

4 Is there continuity between EHCU connector

terminals, 10 and 28 to body ground?

- Go to Step 6

Repair body

grounded

harness.

Go to Step 6

5 Is stop light switch operation normal?

Repair stop

light

harness.

Go to Step 6

Replace stop

light switch.

Go to Step 6

6 Reconnect all components, ensure all components

are properly mounted.

Was this step finished? -

Repeat the

“Basic

diagnostic

flow chart” Go to Step 6

Operating Sound Is Heard From EHCU When Brakes Are Not Applied

Step Action Value(s) Yes No

1 Is this the first vehicle time the vehicle is being

driven after engine start?

Self-check

sound.

Normal Go to Step 2

2 Is vehicle speed under 10 km/h?

Self-check

sound.

Normal Go to Step 3

3 Does the sound occur under any of the following

conditions?

• During transmission gear shifting.

• Driving on slippery surfaces (gravel, ice or snow)

• On high-speed turns.

• Driving over speed-humps or curbs.

• While operating electrical equipment.

• ‘Racing’ the engine with the vehicle stationary.

ABS may

sometimes

be actuated

even when

brake pedal

is not

applied. Go to Step 4

4 Is there play in each or any sensor/wheel speed

sensor/sensor rotor? - Repair.

Go to Step 7 Go to Step 5

5 Damage or powdered iron sticking to each or any

wheel speed sensor/sensor rotor? - Repair.

Go to Step 7 Go to Step 6

6 Is each sensor output normal?

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Check

harness/

connector for

open circuits

If no open

circuit is

found,

replace

EHCU

Go to Step 7 Repair.

Go to Step 7

7 Reconnect all components, ensure all components

are properly mounted.

Was this step finished? -

Repeat the

“Basic

diagnostic

flow chart” Go to Step 7

No ABS Warning Lamp

Step Action Value(s) Yes No

1 Check the meter fuse for the instrument cluster

ignition feed circuit.

Is the fuse OK? - Go to Step 3 Go to Step 2

2 Replace the fuse.

Is the action complete? - Verify repair

Go to Step 3 -

3 1. Ignition “OFF,” disconnect the EHCU.

2. Ignition “ON,” engine “OFF.”

3. Observe the ABS warning lamp.

Is the ABS warning lamp “ON”? - Go to Step 5 Go to Step 4

4 Repair or replace the meter circuit or meter.

Is the action complete? - Verify repair -

5 1. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 6

6 1. Ignition “OFF,” reconnect the EHCU.

2. Ignition “ON,”engine “OFF.”

3. Observe the ABS warning lamp.

Is the ABS warning lamp “ON”? - Verify repair Go to Step 7

7 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Is the action complete? - Verify repair -

DTC C0221 (Flash Code 21) Front Right Wheel Speed Sensor Short

Circuit or Circuit Open

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front right wheel

speed sensor harness connector.

2. Check installation condition for front rig ht wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and front right

wheel speed sensor.

2. Check the circuit between EHCU and front right

wheel speed sensor. (Circuit for an open, short to

ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

DTC C0222 (Flash Code 22) Front Right Wheel Speed Sensor

Incorrect Signal

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front right wheel

speed sensor harness connector.

2. Check installation condition for front rig ht wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and front right

wheel speed sensor.

2. Check the circuit between EHCU and front right

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Replace front right wheel speed sensor.

2. Select “Display DTCs” with the Tech 2.

Note : Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 5 Verify repair

DTC C0223 (Flash Code 23) Front Right Wheel Speed Sensor Signal -

Tooth Chipping

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front right wheel

speed sensor harness connector.

2. Check installation condition for front rig ht wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Check condition for sensor rotor at front hub.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Ignition “OFF,” disconnect the EHCU and front right

wheel speed sensor.

2. Check the circuit between EHCU and front right

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

DTC C0225 (Flash Code 25) Front Left Wheel Speed Sensor Short

Circuit or Circuit Open

LTW35AMF000101

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front left wheel

speed sensor harness connector.

2. Check installation condition for front left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and front left

wheel speed sensor.

2. Check the circuit between EHCU and front left

wheel speed sensor. (Circuit for an open, short to

ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

DTC C0226 (Flash Code 26) Front Left Wheel Speed Sensor

Incorrect Signal

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front left wheel

speed sensor harness connector.

2. Check installation condition for front left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and front left

wheel speed sensor.

2. Check the circuit between EHCU and front left

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Replace front left wheel speed sen sor.

2. Select “Display DTCs” with the Tech 2.

Are any DTCs stored? - Go to Step 5 Verify repair

5 Repair or replace the front left sensor rotor at front

hub.

Was the action complete? - Verify repair

Go to Step 6 -

DTC C0227 (Flash Code 27) Front Left Wheel Speed Sensor Signal -

Tooth Chipping

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the front left wheel

speed sensor harness connector.

2. Check installation condition for front left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Check condition for sensor rotor at front hub.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Ignition “OFF,” disconnect the EHCU and front left

wheel speed sensor.

2. Check the circuit between EHCU and front left

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

DTC C0231 (Flash Code 31) Rear Right Wheel Speed Sensor Short

Circuit or Circuit Open

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear right wheel

speed sensor harness connector.

2. Check installation condition for rear right wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and rear right

wheel speed sensor.

2. Check the circuit between EHCU and rear rig ht

wheel speed sensor. (Circuit for an open, short to

ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

DTC C0232 (Flash Code 32) Rear Right Wheel Speed Sensor

Incorrect Signal

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear right wheel

speed sensor harness connector.

2. Check installation condition for rear right wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and rear right

wheel speed sensor.

2. Check the circuit between EHCU and rear rig ht

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Replace rear right wheel speed sensor.

2. Select “Display DTCs” with the Tech 2.

Note : Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 5 Verify repair

DTC C0233 (Flash Code 33) Rear Right Wheel Speed Sensor Signal -

Tooth Chipping

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear right wheel

speed sensor harness connector.

2. Check installation condition for rear right wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Check condition for sensor rotor at rear axle.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Ignition “OFF,” disconnect the EHCU and rear right

wheel speed sensor.

2. Check the circuit between EHCU and rear rig ht

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

DTC C0235 (Flash Code 35) Rear Left Wheel Speed Sensor Short

Circuit or Circuit Open

LTW35AMF000101

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear left wheel

speed sensor harness connector.

2. Check installation condition for rear left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and rear left

wheel speed sensor.

2. Check the circuit between EHCU and rear left

wheel speed sensor. (Circuit for an open, short to

ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

DTC C0236 (Flash Code 36) Rear Left Wheel Speed Sensor

Incorrect Signal

LTW35AMF000101

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear left wheel

speed sensor harness connector.

2. Check installation condition for rear left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and rear left

wheel speed sensor.

2. Check the circuit between EHCU and rear left

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Replace rear left wheel speed sensor.

2. Select “Display DTCs” with the Tech 2.

Note : Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech 2.

Are any DTCs stored? - Go to Step 5 Verify repair

DTC C0237 (Flash Code 37) Rear Left Wheel Speed Sensor Signal -

Tooth Chipping

LTW35AMF000101-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the rear left wheel

speed sensor harness connector.

2. Check installation condition for rear left wheel

speed sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Check condition for sensor rotor at rear axle.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Ignition “OFF,” disconnect the EHCU and rear left

wheel speed sensor.

2. Check the circuit between EHCU and rear left

wheel speed sensor. (short to ground, or short to

voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

DTC C0238 (Flash Code 38) Tire Diameter Error

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for the tire size of each wheels.

2. If the tire size is different, replace the tire.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Check for the gear ratio of a front axle differential

gear and a rear axle differential gear.

2. If the gear ratio is different, repair the gear ratio.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 Select “Display DTCs” with the Tech 2.

Note : Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 5 Verify repair

5 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0241 (Flash Code 41) Front Right Isolation Solenoid Circuit

Open or Shorted to Ground

DTC C0242 (Flash Code 42) Front Right Dump Solenoid Circuit Open

or Shorted to Ground

DTC C0243 (Flash Code 43) Front Right Isolation Solenoid Circuit

Shorted to Battery

DTC C0244 (Flash Code 44) Front Right Dump Solenoid Circuit

Shorted to Battery

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0245 (Flash Code 45) Front Left Isolation Solenoid Circuit

Open or Shorted to Ground

DTC C0246 (Flash Code 46) Front Left Dump Solenoid Circuit Open

or Shorted to Ground

DTC C0247 (Flash Code 47) Front Left Isolation Solenoid Circuit

Shorted to Battery

DTC C0248 (Flash Code 48) Front Left Dump Solenoid Circuit

Shorted to Battery

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0251 (Flash Code 51) Rear Isolation Solenoid Circuit Open or

Shorted to Ground

DTC C0252 (Flash Code 52) Rear Dump Solenoid Circuit Open or

Shorted to Ground

DTC C0253 (Flash Code 53) Rear Isolation Solenoid Circuit Shorted

to Battery

DTC C0254 (Flash Code 54) Rear Dump Solenoid Circuit Shorted to

Battery

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0265 (Flash Code 65) Fail Safe Relay (FSR) shorted to Ground

DTC C0266 (Flash Code 66) Fail Safe Relay (FSR) shorted to Battery

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0267 (Flash Code 67) ABS Motor shorted to Ground

DTC C0268 (Flash Code 68) ABS Motor shorted to Battery

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0271 (Flash Code 71) ECU Failure or Valve +B Circuit Open

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 4 Verify repair

4 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0274 (Flash Code 74) ABS Operation Long Time

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 Was the “Basic Inspection Procedure” performed?

- Go to Step 3

Go to Basic

Inspection

Procedure

3 1. Check for a poor connection at the wheel speed

sensor harness connector.

2. Check installation condition for wheel speed

sensor.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Check condition for sensor rotor.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

5 1. Ignition “OFF,” disconnect the EHCU and wheel

speed sensor.

2. Check the circuit between EHCU and wheel

speed sensor.(short ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 6

6 1. Ignition “OFF”.

2. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 7

7 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 8 Verify repair

8 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0276 (Flash Code 76) G-Sensor Malfunction

RTW35AMF000301-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connectio n at the G-sensor

harness connector.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF”, disconnect the G-sensor and EHCU.

2. Ignition “ON”, engine “OFF”.

3. Check the supply voltage to G-sensor.

Was the value normal? Battery

Voltage Go to Step 5 Go to Step 4

4 Repair or replace the power supply circuit.

Was the action complete? - Verify repair -

5 1. Check the circuit between EHCU and G-sensor.

(Circuit for an open, short to ground, or short to

voltage.)

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 6

DTC C0277 (Flash Code 77) Power Supply Low Input

DTC C0278 (Flash Code 78) Power Supply High Input

LTW35AMF000301

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor connection at EHCU

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF”, disconnect EHCU.

2. Ignition “ON”, engine “OFF”.

3. Check the supply voltage to EHCU.

Was the value normal? Battery

Voltage Go to Step 5 Go to Step 4

4 Repair or replace the power supply circuit.

Was the action complete? - Verify repair -

5 1. Check the power supply circuit.

(Circuit for an open, short to ground, or short to

voltage.)

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 6

6 1. Ignition “ON,” engine “OFF.”

2. Select “Display DTCs” with the Tech 2.

Note: Perform the various tests (actuator test,

test run, brake test, etc.) then observe the DTC

with a Tech2.

Are any DTCs stored? - Go to Step 7 Verify repair

7 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

DTC C0282 (Flash Code 82) 4 Wheel Drive State Input Signal Failure

RTW35AMF000301-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Check for a poor conn ection at EHCU and 2-4WD

control unit.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 3

3 1. Ignition “OFF,” disconnect the EHCU and 2-4WD

control unit.

2. Check the circuit between EHCU and 2-4WD

control unit. (Circuit for an open, short to ground, or

short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 4

4 1. Check the 2-4WD Control system.

2. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 5

DTC C0285 (Flash Code 85) Assembly Error (G-sensor)

RTW35AMF000301-a

Step Action Value(s) Yes No

1 Was the “Basic Diagnostic Flow Chart” performed?

- Go to Step 2

Go to Basic

Diagnostic

Flow Chart

2 1. Ignition “OFF”.

2. Check for vehicle type and EHCU type.

(Vehicle type : 2WD or 4WD)

3. Checks the EHCU type is the same as a vehicles

type.

If the EHCU type differs from the vehicle s type,

EHCU is replaced.

Note: Check the EHCU type for specification, when the

EHCU is replaced.

(Specification ; 2WD model or 4WD model)

Was the action complete? - Go to Step 3 -

3 1. Check for vehicle type. (Vehicl e type : 2WD or

4WD)

Was vehicle type 2WD? - Go to Step 4 Go to Step 6

Step Action Value(s) Yes No

4 1. Ignition "OFF".

2. Check for a poor condition at the EHCU harness

connector.

3. Check the EHCU circuit for an open, short to

ground, or short to voltage. Also, check the

EHCU ignition feed circuit for an open or short to

ground and the EHCU ground circuit for an open

or short to voltage.

4. If a problem is found, repair as necessary.

Was a problem found? - Verify repair Go to Step 9

5 1. Ignition "OFF," disconnect the EHCU and G-

sensor.

2. Check the circuit between EHCU and G-sensor.

(short to ground, or short to voltage.)

3. If a problem is found, repair as necessary.

Was a problem found? - Verify repair

Go to Step 6 Go to Step 6

6 1. Remove the G-sensor.

2. Reconnect G-sensor and EHCU

3. Install the Tech 2.

4. Ignition "ON", engine "OFF".

5. Observe the G-sensor reading on Tech 2.

If G-sensor inclines, reading voltage will change.

Is the reading voltage between specified value? 1.0 – 4.0 V Go to Step 7 Go to Step 8

7 1. Ignition "OFF".

2. Install the G-sensor.

3. Install the Tech 2.

4. Ignition "ON", engine "OFF".

5. Select "Display DTCs" with the Tech 2.

Are any DTCs stored? - Go to Step 8 Verify repair

8 1. Replace G-sensor.

2. Select "Display DTCs" with the Tech 2.

Note: Perform the various tests (actuator test, test

run, brake test, etc.) then observe the DTC with a

Tech2.

Are any DTCs stored? - Go to Step 9 Verify repair

9 Replace EHCU.

Important: Ensure the correct EHCU type (2WD

Model or 4WD Model) is fitted, when the EHCU is

replaced.

Was the action complete? - Verify repair -

Special Tools

ILLUSTRATION TOOL NO.

TOOL NAME

5–8840–0385–0

(J–35616)

Connector test adaptor

kit

5–8840–0366–0

(J–39200)

High impedance

multimeter

Tech 2 Set

(1) PCMCIA Card

(2) SAE 16/19 Adapter

(3) DLC Cable

(4) Tech 2