SECTION 7D1 - TRANSMISSION CONTROL

SYSTEM (4L30–E)

Service Precaution

General Description

Electronic Control Diagram

Powertrain Control Module (PCM)

Control System Diagram

Shift Control

Band Apply Control

Torque Converter Clutch Control

Line Pressure Control

On–Board Diagnostic System

Fail Safe Mechanism

Torque Management Control

ATF Warning Control

ABS Control (If equipped)

Shift Mode Control

Gear Shift Control

Winter Drive Mode

Backup Mode

Functions of Input / Output Components

Diagnosis

Electronic Diagnosis

Check Trans Indicator

Diagnostic Check

“Check Trans” Check

Tech2 OBD II Connection

Using Tech 2 On The Vehicle

Transmission Application Menu

THM 4L30E Transmission Functions

F0: Transmission Data

F1: PC Solenoid Data

OBD II Diagnostic Management System

16 – Terminal Data Link Connector (DLC)

Malfunction Indicator Lamp (MIL)

Types Of Diagnostic Trouble Codes (DTCs)

Clear DTC

DTC Check

PCM Precaution

Information On PCM

Intermittent Conditions

UBS Jackaroo

Diagnostic Trouble Code (DTC) Identification

DTC P0218 Transmission Fluid Over Temperature

DTC P0560 System Voltage Malfunction

DTC P0705 Transmission Range Switch (Mode

Switch) Illegal Position

DTC P0706 Transmission Range Switch (Mode

Switch) Performance

DTC P0712 Transmission Fluid Temperature (TFT)

Sensor Circuit Low Input

DTC P0713 Transmission Fluid Temperature (TFT)

Sensor Circuit High Input

DTC P0719 TCC Brake Switch Circuit High (Stuck

On)

DTC P0722 Transmission Output Speed Sensor

(OSS) Low Input

DTC P0723 Transmission Output Speed Sensor

(OSS) Intermittent

DTC P0730 Transmission Incorrect Gear Ratio

DTC P0748 Pressure Control Solenoid (PCS) (Force

Motor) Circuit Electrical

DTC P0753 Shift Solenoid A Electrical

DTC P0758 Shift Solenoid B Electrical

DTC P1790 ROM Transmission Side Bad Check

Sum

DTC P1792 EEPROM Transmission Side Bad

Check Sum

DTC P1835 Kickdown Switch Always On

DTC P1850 Brake Band Apply Solenoid Malfunction

DTC P1860 TCC Solenoid Electrical

Transmission Fluid Temperature (TFT) Sensor

Specifications

Service Precaution

WARNING: IF SO EQUIPPED WITH 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

The 4L30–E is a 4–speed fully automatic transmission.

It uses a microcomputer as a control unit to judge

running conditions including throttle opening rate and

vehicle speed, then it sets the shifting point in the

optimum timing so that best driving performance can be

achieved.

In addition, the built–in shift mode select function can

select three shift modes according to the driver's

preference:

• Normal mode –Normal shift pattern.

• Winter mode –Starts in 3rd gear to reduce slippage

on ice or snow.

• Power mode has a delayed upshift for when more

powerful acceleration is required.

Also, the built–in fail safe function (“backup mode”)

assures driving performance even if the vehicle speed

sensor, throttle signal or any solenoid fails.

Further, the self–diagnostic function conducts diagnosis

in a short time when the control system fails, thus

improving serviceability.

The major features of 4L30–E are as follows:

• A compact structure consisting of 2 sets of planetary

gears and flat torque converter.

• Electronic control selects the optimum shift mode

according to the driving conditions.

• Electronic control maintains the optimum hydraulic

pressure for clutch, band brake as well as

transmission so that shift feeling is improved.

• Two sets of planetary gears reduce friction of power

train.

Also, a lockup mechanism in the torque converter

reduces fuel consumption.

• Wide gear ratio and high torque rate of torque

converter provide excellent starting performance.

Electronic Control Diagram

C07RW052

Powertrain Control Module (PCM)

C07RW051

Control System Diagram

C07RY00031

Shift Control

The transmission gear is shifted according to the shift

pattern selected by the driver. In shifting gears, the

gear ratio is controlled by the ON/ OFF signal using the

shift solenoid A and the shift solenoid B.

Band Apply Control

The band apply is controlled when in the 3–2 downshift

(engine overrun prevention) and the garage shift

(shock control).

The band apply solenoid is controlled by the signal from

the Pulse Width Modulation (PWM) to regulate the flow

of the oil.

Torque Converter Clutch Control

The clutch ON/OFF is controlled by moving the

converter clutch valve through shifting Torque Converter

Clutch (TCC) solenoid using the ON/OFF signal.

Line Pressure Control

The throttle signal allows the current signal to be sent to

the force motor. After receiving the current signal, the

force motor activates the pressure regulator valve to

regulate the line pressure.

On–Board Diagnostic System

Several malfunction displays can be stored in the

Powertrain Control Module (PCM) memory, and read

out of it afterward.

The serial data lines, which are required for the testing

of the final assembly and the coupling to other

electronic modules, can be regulated by this function.

Fail Safe Mechanism

If there is a problem in the transmission system, the

PCM will go into a “backup” mode.

The vehicle can still be driven, but the driver must use

the select lever to shift gears.

Torque Management Control

The transmission control side sends the absolute spark

advance signal to the engine control side while the

transmission is being shifted. This controls the engine

spark timing in compliance with the vehicle running

condition to reduce the shocks caused by the change

of speed.

ATF Warning Control

The oil temperature sensor detects the ATF oil

temperature to control the oil temperature warning,

TCC, and the winter mode.

ABS Control (If equipped)

When the select lever is at “L” or “R” range, a signal is

sent to the ABS controller as one of the ABS control

conditions.

Shift Mode Control

C07RY00012

Gear Shift Control

F07RT034

Winter Drive Mode

1. Operation

The winter switch will operate when switched on

after all of the following conditions are present:

a The gear select position is“D”, “N”, “R”and “P”

range.

b Vehicle speed is 7mph (11km/h) or less.

c Transmission oil temperature is 130°C (266°F)

or less.

d Kickdown switch is off.

e Accelerator opening is at 8% or less.

2. Cancel Release

1. Cancellation by driver

a Turning off the winter drive mode switch

b Shifting select position to“3”, “2”, or “L”

(Winter drive mode is not canceled by

selecting“N”, “R”, or “P” from“D”)

c Ignition key is turned off.

2. Automatic cancellation

a When vehicle runs at 19mph (30 km/h)

(6VD1) or 21 mph (34 km/h) (6VE1) or more

for 1 second or more

b When transmission oil temperature reaches

130°C (266°F) or above

NOTE: The mode returns to normal drive mode or

power drive mode after the winter drive mode is

canceled.

Backup Mode

If a major system failure occurs which could affect

safety or damage the transmission under normal vehicle

operation, the diagnostic system detects the fault and

overrides the Powertrain Control Module (PCM).

The “CHECK TRANS” light flashes to alert the driver,

and the transmission must be manually shifted as

follows:

Shifts are firmer to prevent clutch slip and consequent

wear. The fault should be corrected as soon as

possible.

Select lever position Gear Ratio Selected

D 4 (Fourth)

Manual 3 4 (Fourth)

Manual 2 3 (Third)

Manual L 1 (First)

R Reverse

Functions of Input / Output Components

* If equipped

Components Function

Speed sensor

(fixed to transmission (T/M))

Senses rotation of output shaft and feeds the data to Powertrain Control Module

(PCM).

Throttle position sensor

(TPS)

(fixed to engine)

Senses the extent of throttle valve opening and the speed of the throttle valve

lever motion to open the valve. Feeds the data to PCM.

Brake Switch (SW)

(fixed to brake pedal)

Senses whether the driver has pressed the brake pedal or not and feeds the

information to PCM.

Kickdown SW

(fixed to accelerator pedal)

Senses whether the driver has pushed the accelerator pedal fully or not, and

feeds the information to PCM.

Mode SW (fixed to T/M) Senses the select lever position, and feeds the information to PCM.

Power drive SW

(fixed to front console)

Senses whether the driver has selected the power mode, and feeds the

information to PCM.

T/M oil temp. sensor Senses the T/M oil temperature and feeds the data to PCM

Engine coolant temperature

sensor

Senses the engine coolant temperature, and feeds the data to PCM.

Engine speed signal Feeds the signals monitoring engine speed to PCM from crank angle sensor.

Air conditioning information Senses whether the air conditioner has been switched on or not, and feeds the

information to PCM.

Winter switch (fixed to front

console)

Senses whether the driver has selected the winter mode, and feeds the

information to PCM.

Cruise controller *

(Overdrive OFF signal)

Downshift takes place when Overdrive OFF signal is received from auto cruise

control unit.

Shift solenoid A, B Selects shift point and gear position suited to the vehicle running condition on the

basis of PCM output.

Band apply solenoid Controls oil flow suited to the vehicle running condition on the basis of PCM

output.

Torque Converter Clutch

solenoid

Controls clutch engagement/disengagement suited to the vehicle running

condition on the basis of PCM output.

Force motor

(Pressure regulator

valve)

Adjusts the oil pump delivery pressure to line pressure suited to the vehicle

running condition on the basis of PCM output.

Power drive mode lamp Informs the driver whether the vehicle is in power mode or not.

Winter drive mode lamp Informs the driver whether the vehicle is in winter mode or not.

T/M monitor lamp

(“CHECK TRANS”)

Informs the driver of failure in the system.

ATF warning lamp Lights when ATF oil temperature rises.

ABS signal * When the select lever is at “Reverse” or “L” range, sends a signal to the ABS

controller as one of the ABS control conditions.

Diagnosis

Electronic Diagnosis

How To Diagnose The Problem

1. To avoid incorrect diagnostics, this book needs to be

followed accurately. Unless stated, do not jump

directly to a section that could contain the solution.

Some important information may be missed.

2. The sections in CAPITALS and bold are the main

sections that can be found in the contents.

3. The GOTO “SECTION” means to continue to check

going to the“section”.

4. The GOTHROUGH “SECTION” means to go

through the “section” and then to go back to the

place the GOTHROUGH was written.

5. BASIC ELECTRIC CIRCUITS:

You should understand the basic theory of

electricity. This includes the meaning of voltage,

amps, ohms, and what happens in a circuit with an

open or shorted wire. You should also be able to

read and understand wiring diagrams.

Check Trans Indicator

Find CHECK TRANS indicator and verify if it is

A Flashing: GOTO DIAGNOSTIC CHECK.

B Staying on: GOTHROUGH CHECK TRANS

CHECK.

C Is never ON when the ignition key is turned on:

GOTHROUGH CHECK TRANS CHECK

D Is ON during 2 seconds at ignition but OFF after:

Normal operation. No DTC or malfunction.

821RW261

Diagnostic Check

This test determines if the transmission or its inputs,

outputs, connections, or sensors are failing.

1. Connect the Tech2: GOTHROUGH Tech2 OBD II

CONNECTION.

2. Turn on the ignition but not the engine.

3. Push “F2” on Tech2 to see the Diagnostic Trouble

Code (DTC):

4. Do you have a DTC?

YES: write down all code numbers and do the DTC

CHECK

NO: the DTC can not help you finding the problem.

1. GOTHROUGH “CHECK TRANS” CHECK

2. IF it is flashing and the flash is 0.2 seconds ON

and 0.2 seconds OFF, this means that you

should have a DTC stored. Please recheck

GOTO DIAGNOSTIC CHECK and if you find

the same problem, replace the Powertrain

Control Module (PCM).

Normal

C07RW047

Abnormal

C07RW048

“Check Trans” Check

1. Indicator it is ON during 2 seconds at ignition (or

when the engine is cranked) but it is OFF after the

engine starts. The indicator is working normally

GOTO DIAGNOSTIC CHECK.

821RW261

Normal

C07RW047

2. Indicator it is flashing and the flash is 0.2 seconds

ON and 0.2 seconds OFF always when ignition is

on (engine cranked or not). This means that there is

a malfunction. GOTO DIAGNOSTIC CHECK.

Abnormal

C07RW048

3. Indicator it is staying ON always when Ignition is

ON.

1. This means that connection between the lamp

and the PCM is shorted to ground.

2. Verify if instrument panel terminal 3 of connector

I–9 is shorted to ground.

3. Verify if the PCM connector J1 (RED) terminal

A14 is shorted to ground.

4. Verify that the instrument panel terminal 15 of

connector I–9 is connected to battery.

5. IF problem solved: GOTO CHECK TRANS

INDICATOR.

NO:Replace Powertrain Control Module (PCM).

4. Indicator it is staying OFF with the ignition ON

(engine OFF).

1. This means that connection between the lamp

and the PCM is shorted to battery or opened.

2. Verify if instrument panel terminal 3 of connector

I–9 is shorted to battery or open.

3. Verify if the PCM connector J1 (RED) terminal

A14 is shorted to battery or open.

4. Verify that the instrument panel terminal 15 of

connector I–9 is connected to battery. If not,

check the fuses and the connections voltage.

5. IF problem solved: GOTO CHECK TRANS

INDICATOR.

NO: Replace Powertrain Control Module (PCM).

D07RW028

Tech2 OBD II Connection

In order to access OBD II Powertrain Control Module

(PCM) data, use of the Tech2 scan tool kit (7000086) is

required.

1. The electronic diagnosis equipment is composed of:

1. Tech2 (7000057) hand–held scan tool unit and

DLC cable (3000095).

901RW176

2. SAE 16/19 adapter (3000098) (1), RS 232 loop

back connector (3000112) (2), and PCMCIA

card (3000117) (3).

F07RW033

2. Connecting the TECH2

901RW180

EndOFCallout

Legend

(1) PCMCIA Card

(2) RS 232 Loop Back Connector

(3) SAE 16/19 Adapter

(4) DLC Cable

(5) Tech2

Using Tech 2 On The Vehicle

NOTE: Due to the constant evolution of TECH 2

software, the screens shown in this section may

differ slightly from those displayed for the vehicle

being tested.

Connecting TECH 2 To The Vehicle

1. Connect Tech 2 to the vehicle DLC, with the DLC

cable and the 16/19 pin adapter.

2. Switch the unit on by pressing the power button (2).

A green light (1) should come on indicating that the

tool is receiving power.

NOTE: At this time the technician should see the Power

On Self Test (POST) run. The POST is a built in

diagnostic self test for the TECH 2 that should find most

common system faults. The POST is run on every

power up to ensure the best operation of the tool. After

the completion of the POST, the TECH 2 unit will briefly

show the POST results. If POST passes, the tool will

continue onto the title screen. If POST fails, results of all

tests will be displayed, and this should show which test

failed. POST failures may be classified as fatal or non-

fatal. A fatal error will not allow the user to continue

using the tool. Failure of the keypad would be an

example of a fatal error. Non-fatal errors found during

the POST will allow continued use of the TECH 2, but

with some limitations. If either a fatal or non-fatal error

occurs, refer to the Troubleshooting section of the

TECH 2 User's Guide.

1. Power Status Indicator Light

2. PWR (Power) Key

3. SHIFT Key

4. SHIFT Key Status Indicator Light

3. At the Tech 2 title screen press the ENTER key to

continue.

PWR

TECH 2

Tech

10 Megabyte

Press [ENTER] to continue

Software Version 11.010

Holden 1997 - 2002

4. A selection can be made from the Main Menu,

either by using a function key or by using the arrow

keys to highlight a menu choice and pressing

ENTER.

•NOTE: You will then need to supply some additional

information to the TECH 2. This requires navigation

through a series of lists (called picklists). On some

menus or picklists, the user can use a function key to

make a menu selection, but most of the picklists

require using the selection and action keys. If a

mistake is made in the selection process, or if a

different application or function is desired, press EXIT

to back up one level. Within an application, there may

be soft keys which are available for use. These soft

keys allow access to additional tool functions without

exiting a current tool function. Soft keys are made up

of sets which will appear together. To see the next set

of soft keys, select the More soft key.

The TECH 2 Main Menu contains the following:

F0: Diagnostics

Contains all functions to test, diagnose, monitor and

program the different vehicle systems.

F1: Service Programming System (SPS)

SPS is used in conjunction with Technical

Information System (TIS) 2000 to program vehicle

control units.

F2: View Capture Data

Contains all functions to work with one or two

previously recorded snapshots on one or two

vehicles. This function is to enable the viewing of

captured data without a vehicle.

F3: Tool Options

Contains the TECH 2 self test, set clock, set units,

set screen contrast and Getting Started.

F4: Download/Upload Help

Contains help information on the downloading and

uploading from the TECH 2 to the TIS 2000 CD-

ROM.

Main Menu

UBS2000a

F0: Diagnostics

F1: Service Programming System (SPS)

F2: View Capture Data

F3: Tool Options

F4: Download/Upload Help

5. Select the correct Model Year with the arrow keys

and the press ENTER. The Vehicle identification

screen will then be displayed.

6. Select the correct Vehicle Type with the arrow keys

and the press ENTER. The System Select Menu

will then be displayed.

7. The desired system can be selected from the

System Select Menu with the function keys or with

arrow keys and then press ENTER.

F0:Powertrain contains all functions to test,

diagnose, and monitor the engine and transmission

systems that communicate with the Tech 2 via the

Powertrain Control Module (PCM).

F1: Chassis contains all functions to test,

diagnose, monitor the vehicles chassis systems;

TOD and ABS modules.

F2: Body contains all functions to test, diagnose,

monitor the instruments and Supplemental

Restraint System.

Main Menu

Select one of the following

Model Year(s)

TF2001a

(2)

(1)

(Y)

(X)

(W)

(V)

(2)

2002

2001

2000

1999

1998

1997

1 / 6

2002

Main Menu

Select one of the following

Vehicle Type(s)

Frontera

Jackaroo

Rodeo

VX Commodore

VU Utility

WH Statesman & Caprice

Corsa-B

Corsa-C

Astra-F

Astra-G

Jackaroo

1 / 10

UBS2001

System Select Menu

(1) 2001 Jackaroo

F0: Powertrain

F1: Chassis

F2: Body

UBS2002

Transmission Application Menu

1. Select the correct transmission from the Vehicle

Identification menu with the arrow keys, then press

ENTER and follow the screen instructions.

2. Turn on the ignition and press the Confirm soft key.

3. The Transmission Identification screen will then

display the Part Number and Identifier. This

information will vary with engine type and software

level. Press the Confirm soft key, the transmission

application menu will then be displayed.

NOTE: If Tech 2 is able to communicate with the

PCM the Engine identification information will be

displayed. If Tech 2 is unable to communicate with

the PCM, Tech 2 will display “Waiting for Data”.

The following functions are available in the

transmission application menu:

F0: Diagnostic Trouble Codes

F1: Data Display

F2: Snapshot

F3: Miscellaneous Tests

Vehicle Identification

Select one of the following

Powertrain

3.0L L4 4JX1

3.5L V6 6VE1

4L30E

AW30-40LE

4L30E

3 / 4

UBS2005

Powertrain

(2) 2002 Jackaroo

Electronic System: 4L30E

Turn Ignition On!

UBS2005k

Confirm

THM 4L30E Transmission Functions

F0: DIAGNOSTIC TROUBLE CODES

In this test mode, DTCs stored by the TCM can be displayed or cleared. When F0: Diagnostic Trouble Codes is

selected, there are an additional two modes:

F0: Read DTC Info By Priority: All current DTC(s) will be displayed.

F1: Clear Current DTC: Clears all current DTC(s) in the PCM memory.

F1: DATA DISPLAY

In this mode, TECH 2 continuously monitors transmission data. When F1: Data Display is selected, there are

additional two modes:

F0: Transmission Data: TECH 2 continuously monitors transmission data.

F1: TCC Data: TECH 2 continuously monitors torque converter clutch data.

F2: SNAPSHOT

In this test mode, the TECH 2 scan tool captures data before and after a snapshot triggering condition which may or

may not set a DTC.

F3: MISCELLANEOUS TESTS

In this test mode, the TECH 2 performs software override commands of the TCM, to assist in problem isolation during

diagnostics.

F0:Check Light: Allows the user to turn the ‘CHECK TRANS’ Lamp ON & OFF.

F1:Power Lamp: Allows the user to turn the ‘Power’ Lamp ON & OFF.

F2: Solenoid 1-2/3-4 test: Allows the user to turn the 1-2/3-4 shift solenoid ON & OFF.

F3: Solenoid 2-3 test: Allows the user to turn the 2-3 shift solenoid ON & OFF.

F4: Band Apply Solenoid: This test allows the user to turn the Band Apply solenoid ON & OFF.

F5: TCC Solenoid: Allows the user to turn the TCC solenoid ON & OFF.

F6: Power Control Driver Test: Allows the user to all turn solenoids ON & OFF simultaneously.

F7: Pressure Reg.Solenoid test: Allows the user to turn the Pressure Regulator Solenoid ON & OFF.

F8: Pressure Reg. Solenoid: Allows the user to increase and decrease the current through the PRS.

F0: Transmission Data

Item Unit Engine running at idle

Engine Speed RPM 750 ~ 900 RPM

Vehicle Speed km/h, MPH 0 MPH

Throttle Position % 0 %

Throttle Position Sensor V 0.5 ~ 1.0 V

Manifold Absolute Pressure kPa approx. 40 kPa

Barometric Pressure kPa approx. 102 kPa

AT Output Speed (Automatic Transmission) RPM 0 RPM

AT Input Speed Ratio (Automatic Transmission) 0.0

Ignition Voltage V 12.8 ~ 14.1 V

AT Oil Temperature (Automatic Transmission) °C, °F 70 ~ 80°C (158 ~ 176°F)

AT Oil Life Monitor (Automatic Transmission) % 100 %

Commanded Gear 1

Current Gear 1

Mode Switch C Inactive, Active Inactive

Mode Switch B Inactive, Active Inactive

Mode Switch A Inactive, Active Active

Mode Switch G Inactive, Active Active

Actual Gear Park

1–2 Shift Solenoid A Off, On Off

2–3 Shift Solenoid B Off, On On

Brake Switch Off, On Off

Solenoid Brake Band Off, On Off

TCC Slip Speed RPM 750 ~ 900 RPM

TCC Status Disabled, Enabled Enabled

TCC Solenoid Off, On Off

TCC Duty Cycle % 0 %

TCC Apply Mode No Apply, In Apply No Apply

TCC Release Mode No, Yes No

TCC On Mode No, Yes No

TCC Off Mode No, Yes Yes

Default Gear No, Yes No

Engine Warm No, Yes Yes

A/C Request Yes, No Yes

A/C Clutch Relay Off, On On

Winter Switch Off, On Off

Winter Drive Lamp Off, On Off

Kickdown Switch Off, On Off

ATF Lamp (Automatic Transmission) Off, On Off

Power Switch Normal, Power Normal

Power Drive Lamp Off, On Off

ABS Status On, Off Off

F1: PC Solenoid Data

Item Unit Engine running at idle

Engine Speed RPM 750 ~ 900 RPM

Vehicle Speed km/h, MPH 0 MPH

Throttle Position % 0 %

Throttle Position Sensor V 0.5 ~ 1.0 V

Manifold Absolute Pressure kPa approx. 40 kPa

Barometric Pressure kPa approx. 102 kPa

PCS Current (Pressure Control Solenoid) A approx. 1.0 A

PCS Actual Current (Pressure Control Solenoid) A approx. 1.0 A

PCS Duty Cycle (Pressure Control Solenoid) % approx. 45 %

Desired PCS Pressure (Pressure Control Solenoid) kPa 43 ~ 52 kPa

Shift Pressure (Line Pressure) kPa 43 ~ 52 kPa

Transmission Temperature °C, °F 75 ~ 110°C (167 ~ 230°F)

OBD II Diagnostic Management System

Powertrain Control Module (PCM) Location

C07RW005

Class 2 Serial Data Bus

OBD II technology requires a much more sophisticated

PCM than does OBD I technology. The OBD II PCM

diagnostic management system not only monitors

systems and components that can impact emissions,

but they also run active tests on these systems and

components. The decision making functions of OBD II

PCMs have also greatly increased. To accommodate

this expansion in diagnostic complexity, Holden

engineers have designed the Class 2 serial data bus,

which meets SAE J1850 recommended practice for

serial data.

“Serial Data” refers to information which is transferred in

a linear fashion – over a single line, one bit at a time. A

“Data Bus” is an electronic pathway through which serial

data travels.

TROOPER previously used a 5 volt data bus called

UART, which is an acronym for“Universal

Asynchronous Receive and Transmit”. When neither the

vehicle's control module nor the diagnostic tool, such as

a Tech2, are “talking,” the voltage level of the bus at rest

is 5 volts. The two computers talk to each other at a rate

of 8,192 bits per second, by toggling or switching the

voltage on the data bus from 5 volts to ground.

Class 2 data, which is used on OBD II vehicles, is quite

different. Data is transferred at a rate of 10.4 kilobits

per second, and the voltage is toggled between zero

and 7 volts.

C07RT006

Class 2 data is also pulse width modulated. Each bit of

information can have one of two lengths: long or short.

On the other hand, UART data bits come in only one

length (short). The pulse width modulation of Class 2

data allows better utilization of the data line.

The message carried on Class 2 data streams are also

prioritized. This means that if two devices try to

communication on the data line at the same time, only

the higher priority message will continue. The device

with the lower priority message must wait.

NOTE: The Class 2 data wire is always terminal 2 of

the new 16–terminal Data Link Connector (DLC).

16 – Terminal Data Link Connector (DLC)

OBD II standardizes Data Link Connector (DLC)

configurations. The DLC, formerly referred to as the

ALDL, will be a 16–terminal connector found on the

lower left side of the driver's side instrument panel. All

manufacturers must conform to this 16–terminal

standard.

821RW262

821RW263

810RT022

EndOFCallout

Malfunction Indicator Lamp (MIL)

The Malfunction Indicator Lamp (MIL) looks the same

as the MIL you are already familiar with (“CHECK

ENGINE”lamp). However, OBD II requires that it

illuminate under a strict set of guidelines. Basically, the

MIL is turned on when the PCM detects a DTC that will

impact the vehicle's emissions.

The MIL is under the control of the Diagnostic

Executive. The MIL will be turned on if a component or

system which has an impact on vehicle emissions

indicates a malfunction or fails to pass an emissions–

related diagnostic test. It will stay on until the system or

component passes the same test, for three consecutive

trips, with no emissions–related faults.

Types Of Diagnostic Trouble Codes (DTCs)

The Diagnostic Executive classifies Diagnostic Trouble

Codes (DTCs) into certain categories. Each type has

different requirements to set the code, and the

Diagnostic Executive will only illuminate the Malfunction

Indicator Lamp (MIL) for emissions–related DTCs.

DTCs fall into four categories: A, B, C, and D; only

types A and B are emission–related The following

descriptions define these categories:

TYPE A

Will store the DTC and turn on the MIL (“Check

Engine”lamp) on the first trip in which an emission–

related diagnostic test has run and reported a “test

failed” to the Diagnostic Executive.

TYPE B

Will store the DTC and turn on the MIL on the second

consecutive trip in which an emission–related

diagnostic test has run and reported a “test failed” to the

Diagnostic Executive. After one failure, the type B DTC

is “armed,” or prepared to store a history code and turn

on the MIL if a second failure occurs. One passed test

will disarm a type B DTC. Some special conditions

apply to misfire and fuel trim DTCs. For a type B DTC

to store and turn on the MIL, two ignition cycles are

required.

TYPE C

Will store the DTC and turn on a “SERVICE” lamp

(“Check Trans”lamp) on the first trip that a non–

emission–related diagnostic test has run and reported a

“test failed” to the Diagnostic Executive. This type of

DTC will be used in future applications.

TYPE D

Will store a DTC but will not turn on the MIL on the first

trip that a non–emission–related diagnostic test has

run and reported a “test failed” to the Diagnostic

Executive. These codes can be very helpful for vehicle

service when the driver may comment about a

condition, but the MIL did not turn on.

PIN 1 – (Not used)

PIN 2 – J1850 Bus + L line on 2–wire systems, or

single wire (Class 2)

PIN 3 – (Not used)

PIN 4 – Chassis ground pin

PIN 5 – Signal ground pin

PIN 6 – PCM diagnostic enable

PIN 7 – (Not used)

PIN 8 – (Not used)

PIN 9 – Primary UART

PIN 10 – (Not used)

PIN 11 – (Not used)

PIN 12 – ABS diagnostic or CCM diagnostic enable

PIN 13 – SIR diagnostic enable

PIN 14 – (Not used)

PIN 15 – (Not used)

PIN 16 – Battery power from vehicle unswitched (4

AMP MAX.)

Clear DTC

NOTE: If you clear the DTC (Diagnostic Trouble

Codes) you will not be able to read any codes recorded

during the last occurrence.

NOTE: To use the DTC again to identify a problem, you

will need to reproduce the fault or the problem. This

may require a new test drive or just turning the ignition

on (this depends on the nature of the fault).

1.IF you have a Tech2:

1.Connect the Tech2 if it is still not connected

GOTHROUGH Tech2 OBD II CONNECTION.

2.Push “F1= Clear DTC Info” in the Application

Menu and answer “Yes” to the question “Do you

want to clear DTC's?”

aWhen a malfunction remains as it is the

Tech2 displays“4L30E CODES NOT

CLEARED”. This means that the problem

is still there or that the recovery was not

done. Please GOTO DTC CHECK.

bWhen a malfunction has been repaired and

the recovery is done. The Tech2

displays“4L30E CODES CLEARED”.

2.IF you have no Tech2:

To clear the DTC, remove Fuse “Stop, A/T CONT”

(C–14, 15A) for at least 10 seconds.

DTC Check

1.Diagnostic Trouble Codes (DTC) have been

identified by Tech2.

2.You have written the list of the DTCs. The order of

the malfunctions has no meanings for this PCM.

Usually only one or two malfunctions should be set

for a given problem.

3.Check directly the DTCs you identified. The DTCs

are sorted by number. Refer to Diagnostic Trouble

Code (DTC) Identification in this section.

PCM Precaution

The PCM can be damaged by:

1. Electrostatic discharge

2. The short circuit of some terminals to voltage or to

ground.

Electrostatic Discharge Damage Description:

1. Electronic components used to control systems are

often designed to carry very low voltage, and are

very susceptible to damage caused by electrostatic

discharge. It is possible for less than 100 volts of

static electricity to cause damage to some electronic

components. By comparison, it takes as much as

4,000 volts for a person to even feel the zap of a

static discharge.

2. There are several ways for a person to become

statically charged. The most common methods of

charging are by friction and induction. An example

of charging by friction is a person sliding across a

car seat, in which a charge of as much as 25,000

volts can build up. Charging by induction occurs

when a person with well insulated shoes stands

near a highly charged object and momentarily

touches ground. Charges for the same polarity are

drained off, leaving the person highly charged with

the opposite polarity. Static charges of either type

can cause damage, therefore, it is important to use

care when handling and testing electronic

components.

NOTE: To prevent possible electrostatic discharge

damage:

1. Do not touch the PCM connector pins or soldered

components on the PCM circuit board.

2. Be sure to follow the guidelines listed below if

servicing any of these electronic components:

3. Do not open the replacement part package until it is

time to install the part.

4. Avoid touching electrical terminals of the part.

5. Before removing the part from its package, ground

the package to a known good ground on the vehicle.

6. Always touch a known good ground before handling

the part. This step should be repeated before

installing the part if the part has been handled

while sliding across the seat, while sitting down from

a standing position or while walking some distance.

Information On PCM

1. The Powertrain Control Module (PCM) is located in

the center console and is the control center of the

electronic transmission control system.

2. The PCM must be maintained at a temperature

below 85°C (185°F) at all times. This is most

essential if the vehicle is put through a paint baking

process. The PCM will become inoperative if its

temperature exceeds 85°C (185°F). Therefore, it is

recommended that the PCM be removed or that

temporary insulation be placed around the PCM

during the time the vehicle is in a paint oven or other

high temperature process.

3. The PCM is designed to process the various inputs

and then respond by sending the appropriate

electrical signals to control transmission upshift,

downshift, shift feel and torque converter clutch

engagement.

4. The PCM constantly interprets information from the

various sensors, and controls the systems that

affect transmission and vehicle performance. By

analyzing operational problems, the PCM is able to

perform a diagnostic function by displaying DTC(s)

and aid the technician in making repairs.

Intermittent Conditions

If the Tech2 displays a diagnostic trouble code as

intermittent, or if after a test drive a DTC does not

reappear though the detection conditions for this DTC

are present, the problem is most likely a faulty

electrical connection or loose wiring. Terminals and

grounds should always be the prime suspect.

Intermittents rarely occur inside sophisticated electronic

components such as the PCM.

Use the DTC information to understand which wires and

sensors are involved.

When an intermittent problem is encountered, check

suspect circuits for:

1. Poor terminal to wire connection.

2. Terminals not fully seated in the connector body

(backed out).

3. Improperly formed or damaged terminals.

4. Loose, dirty, or corroded ground connections:

HINT: Any time you have an intermittent in more

than one circuit, check whether the circuits share a

common ground connection.

5. Pinched or damaged wires.

6. Electro–Magnetic Interference (EMI):

HINT: Check that all wires are properly routed away

from spark plug wires, distributor wires, coil, and

generator. Also check for improperly installed

electrical options, such as lights, 2–way radios, etc.

Use the F3 SNAPSHOT mode of the Tech2 to help

isolate the cause of an intermittent fault. The snapshot

mode will record information before and after the

problem occurs. Set the snapshot to “trigger” on the

suspect DTC. If you notice the reported symptom

during the test drive, trigger the snapshot manually.

After the snapshot has been triggered, command the

Tech2 to play back the flow of data recorded from each

of the various sensors. Signs of an intermittent fault in a

sensor circuit are sudden unexplainable jump in data

values out of the normal range.

Transmission And PCM Identification

The chart below contains a list of all important

information concerning rear axle ratio, Powertrain

Control Module (PCM), and transmission identification.

Rr axle

Ratio

PCM TRANSMISSION

HOLDEN Parts No. Calibration

Code Holden Part No. Model Code

4.300

8–16254–019–1

8–16254–959–1

8–09376–619–1

G21 8–96018–270–4 FK (4X4)

UBS Jackaroo

240RY00031

Diagnostic Trouble Code (DTC) Identification

NOTE: On the following charts, refer to the Powertrain

Control Module (PCM) section for the Wiring System,

and the 12B1 or 12B2 section for circuit

diagram details, parts location, and connector

configuration.

DTC

NUMBER DTC NAME DTC TYPE “CHECK

TRANS”

P0218 Transmission Fluid Over Temperature D

P0560 System Voltage Malfunction C Flash

P0705 Transmission Range Switch (Mode Switch) Illegal Position D

P0706 Transmission Range Switch (Mode Switch) Performance D

P0712 Transmission Fluid Temperature Sensor Circuit Low Input

(TFT) D

P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High

Input D

P0719 TCC Brake Switch Circuit High (Stuck ON) D

P0722 Transmission Output Speed Sensor (OSS) Low Input C Flash

P0723 Transmission Output Speed Sensor (OSS) Intermittent C Flash

P0730 Transmission Incorrect Gear Ratio C Flash

P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit

Electrical CFlash

P0753 Shift Solenoid A Electrical C Flash

P0758 Shift Solenoid B Electrical C Flash

P1790 ROM Transmission Side Bad Check Sum C Flash

P1792 EEPROM Transmission Side Bad Check Sum C Flash

P1835 Kickdown Switch Always ON D

P1850 Brake Band Apply Solenoid Malfunction D

P1860 TCC Solenoid Electrical D

DTC TYPE DEFINITION

C Flashing Check Trans on 1st failure

DNo lamps

DTC P0218 Transmission Fluid Over Temperature

D07RW029

Circuit Description

The Transmission Fluid Temperature (TFT) sensor is a

thermister that controls the signal voltage to the PCM.

The PCM supplies a 5–volt reference to the sensor on

circuit RED/BLK–GRN/RED. When the transmission

fluid is cold, the sensor resistance is high and the PCM

will sense high signal voltage. As the fluid temperature

warms to a normal transmission operating temperature

of 100°C (212°F), the sensor resistance becomes less

and the voltage decreases to 1.5 to 2.0 volts.

This DTC detects a high transmission temperature for a

long period of time. This is a type “D” DTC.

Conditions For Setting The DTC

• No TFT DTCs P0712 or P0713.

• TFT is greater than 135°C (275°F).

• All conditions met for 21 seconds.

Action Taken When The DTC Sets

• Hot mode TCC Shift Pattern.

• The PCM will not illuminate the CHECK TRANS

Lamp.

• ATF Lamp ON. (TFT is greater than 145°C (293°F).)

• Disable E–side TCC OFF request.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warm–up cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed, or

damaged terminals. Check for weak terminal tension

as well.

Also check for a chafed wire that could short to bare

metal or other wiring. Inspect for a broken wire inside

the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• Check harness routing for a potential short to ground

in circuit RED/BLK–GRN/RED.

• Scan tool TFT sensor temperature should rise

steadily to about 100°C (212°F), than stabilize.

• Check for a “skewed” (mis–scaled) sensor by

comparing the TFT sensor temperature to the

ambient temperature after a vehicle cold soak. A

“skewed” sensor can cause delayed garage shifts or

TCC complaints.

• Check for a possible torque converter stator problem.

• Verify customer driving habits, trailer towing, etc.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart.

2. This test checks for a “skewed” sensor or shorted

circuit.

3. This test simulates a TFT DTC P0713.

DTC P0218 Transmission Fluid Over Temperature

Step Action Yes No

1 Perform the following checks:

• Check for possible engine system problems.

• Transmission fluid checking procedure. Refer to Checking

Transmission Fluid Level and Condition in Automatic

Transmission (4L30–E) Section.

Were the checks performed? Go to Step 2 —

2 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when “Clear

Info” function is used.

3. Record the DTC“Failure Records”.

Is the TFT sensor signal voltage less than 1.54 volts? Go to Step 3

Go to Diagnostic

Aids

3 1. Turn the ignition“off”.

2. Disconnect the transmission 16–way connector H–53

(additional DTCs may set).

Is the TFT sensor signal voltage greater than 4.92 volts?

Go to Internal

Wiring Harness

Check. Go to Step 4

4 Inspect/repair circuit RED/BLK–GRN/RED for a short to ground.

Was a problem found? Go to Step 6 Go to Step 5

5 1. Inspect the PCM for poor connections.

2. Replace the PCM if no poor connections were found.

Is the replacement complete? Go to Step 6 —

6 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

TFT is less than 125°C (257°F) for at least 10 seconds.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P0560 System Voltage Malfunction

D07RW030

Circuit Description

Circuit WHT is the battery voltage feed for the PCM.

Circuit RED/BLU is the ignition voltage feed for the

PCM.

This DTC detects a low voltage or a high voltage. This

is a type “C” DTC.

Conditions For Clearing The DTC

System Voltage Low:

• Engine speed is greater than 1,000 rpm.

• System voltage is less than 10 volts at a maximum

transmission temperature of 150°C (302°F).

• System voltage is less than 7.3 volts at a minimum

transmission temperature of –40°C (–40°F).

• All conditions met for 4 seconds.

System Voltage High:

• System voltage is greater than 16 volts for 2 seconds.

Action Taken When The DTC Sets

• Fixed to 4th gear.

• Maximum line pressure.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The DTC can be cleared from the PCM history by

using a scan tool.

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Charging the battery with a battery charger and jump

starting an engine may set DTC(s). If DTC(s) set

when an accessory is operated, check for faulty

connections or excessive current draw.

• Check for faulty connections at the starter solenoid or

fusible link.

• Check for loose/damaged terminals at generator.

• Check belt wear/tension.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart.

3. This test checks charging system voltage.

4. This test checks battery voltage input at the PCM.

6. This test checks ignition voltage input at the PCM.

DTC P0560 System Voltage Malfunction

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”. Note: If any other DTCs

are present, refer to their applicable diagnostic charts before

continuing.

4. Using the J–39200 DVOM, measure the battery voltage

across the battery terminals. Record the measurement for

future reference.

Is the voltage higher than 10.5 volts? Go to Step 2

Go to Engine

Electrical in Engine

section

2 Start the engine and warm to normal operating temperature.

Is the generator/check engine light“on”?

Go to Starting and

Charging System

in Engine section Go to Step 3

3 1. Increase the engine speed to 1,000–1,500 rpm.

2. Observe scan tool system voltage.

Is the system voltage within 13–15 volts. Go to Step 4

Go to Starting and

Charging System

in Engine section

4 1. Turn the ignition switch“off”.

2. Disconnect the J1(RED) and J3 (BLUE) PCM connector

(additional DTCs will set).

3. With the engine“off”, turn the ignition switch“on”.

4. Using the J39200 DVOM, measure the battery voltage input

at PCM connector terminals J1–A4 and J3–E16.

Is there a voltage variance between the voltage measured at the

battery (taken in Step 1) and at terminals J1–A4 and J3–E16 that

is greater than 0.5 volts? Go to Step 5 Go to Step 6

5 Repair the high resistance condition in circuit WHT.

Was the circuit repaired? Go to Step 10 —

6 1. Disconnect the J3 (BLUE) PCM connector.

2. Measure the ignition voltage input at PCM connector

terminals J3–E16 and J3–F16.

Is there a voltage variance between the voltage measured at the

battery (taken in Step 1) and at terminals J3–E16 and J3–F16

that is greater than 0.5 volts? Go to Step 7 Go to Step 8

7 Repair the high resistance condition is circuit RED/BLU.

Was the circuit repaired? Go to Step 10 —

8 Check PCM connector terminals J1–A4, J3–E16 and J3–F16 for

bent, damaged, or backed out connector pins. Also check for

weak terminal tension.

Was a problem found? Go to Step 10 Go to Step 9

9 Replace the PCM.

Is the replacement complete? Go to Step 10 —

10 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle under the

following conditions:

Start the vehicle and warm to normal operating temperature.

The PCM must see a system voltage between 10 and 16

volts.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P0705 Transmission Range Switch (Mode Switch) Illegal Position

D07RW031

Circuit Description

• The range switch supplies the Powertrain Control

Module (PCM) with information regarding the selector

lever position: P, R, N, D 3, 2 or L. The selector lever

position is indicated by the state of four ON/OFF

contracts. The range switch is located on one side of

the transmission. It is on the transmission manual

shaft and is fixed to the main case.

• The range switch is also used to provide the

information P or N to the engine crank wiring. The

engine can be cranked only if connector M–25

terminal 4(H) is connected to terminal 1(E) which is

connected to ground.

• The range switch is also used to provide the backup

lamp power in reverse. This is why the range switch

is supplied through a 10A fuse (C–3). This fuse can

burn due to a short circuit in the backup lamp.

This DTC detects when a fuse is open or the range

switch circuit does not work. This is a type “D” DTC.

Conditions For Setting The DTC

• Range switch illegal positions met for 5 seconds.

Action Taken When The DTC Sets

• Default to D position.

• Inhibit torque management.

• Maximum line pressure.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Refer to accompanying chart for the normal range

signals and the illegal combinations.

• Inspect the wiring for poor electrical connections at

the PCM and at the transmission 8–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• Refer to the “Range Switch Logic Table” or

“Functional Test Procedure” for further information.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks the indicated range signal to the

manual valve actually selected.

5. This test checks for continuity between each selected

range switch connector terminals.

Range Switch Logic Table

DTC P0705 Transmission Range Switch (Mode Switch) Illegal Position

Range

Position

Range Switch Pin

ABCP(G)

Park ON OFF OFF ON

Reverse ON ON OFF OFF

Neutral OFF ON OFF ON

D4 OFF ON ON OFF

D3 ON ON ON ON

2ONOFFONOFF

LOFFOFFONON

Illegal OFF OFF OFF OFF

Illegal OFF OFF OFF ON

Step Action Yes No

1 Perform the following checks:

• The transmission linkage from the select lever to the manual

valve is adjusted properly.

• Diagnostic circuit check.

Were the checks performed? Go to Step 2 —

2 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. Select each transmission range: DL, D2, D3, D4, N, R, and

Does each selected transmission range match the scan tool

“Range Switch” display?

Go to Diagnostic

Aids Go to Step 3

3 Are all range switch pin displays incorrect? Go to Step 4 Go to Step 5

4 Check fuse and wiring to the 8–way connector terminal 5(D) for

opens.

Refer to Mode Switch in Automatic Transmission (4L30–E)

section.

If no problem was found, replace the range switch.

Is the replacement complete? Go to Step 8 —

5 1. Disconnect the 8–way range switch connector.

2. Using ohmmeter, check continuity between terminal 5(D) and

respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8–way

range switch connector.

3. Move shift selector lever through all positions and compare

results with“Range Switch Logic Table”.

Is one range switch pin display incorrect? Go to Step 6 Go to Step 7

6 Check the affected wiring and connector, and repair.

Is the repair complete? Go to Step 8 —

7 Check the Powertrain Control Module (PCM) connectors for poor

connection.

If no problem was found, replace the PCM.

Is the replacement complete? Go to Step 8 —

8 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and road test the vehicle.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0706 Transmission Range Switch (Mode Switch) Performance

D07RW031

Circuit Description

• The range switch supplies the Powertrain Control

Module (PCM) with information regarding the selector

lever position: P, R, N, D, 3, 2 or L. The selector lever

position is indicated by the state of four ON/OFF

contracts. The range switch is located on one side of

the transmission. It is on the transmission manual

shaft and is fixed to the main case.

• The range switch is also used to provide the

information P or N to the engine crank wiring. The

engine can be cranked only if connector M–25

terminal 4(H) is connected to terminal 1(E) which is

connected to ground.

• The range switch is also used to provide the backup

lamp power in reverse. This is why the mode switch

is supplied through a 10A fuse (C–3). This fuse can

burn due to a shot circuit in the backup lamp.

• This DTC detects an invalid state of the range switch

or the range switch circuit by deciphering the range

switch inputs. This is a type “D” DTC.

Conditions For Setting The DTC

This DTC will set if any of the following conditions

occurs:

Condition 1 (“R”bad position):

• Engine is running.

• No output speed DTCP0722, P0723.

• Output speed greater then 3,200 RPM.

• Range switch indicates“R”.

• All conditions met for 4 seconds.

Condition 2 (“P”or “N” bad position):

• Engine is running.

• No TPS codes.

• Engine speed is less than 3,000 RPM.

• TP angle is greater than 20%.

• Range switch indicates “P” or“N”.

• All conditions met for 4 seconds.

Action Taken When The DTC Sets

• Default to “D” position.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Refer to the accompanying chart for the normal range

signals and the illegal combinations.

• Inspect the wiring for poor electrical connections at

the PCM and at the transmission 8–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal

tension as well. Also check for a chafed wire that

could short to bare metal or other wiring. Inspect for

a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• Refer to the “Range Switch Logic Table” for further

information.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks the indicated range signal to the

manual valve actually selected.

5. This test checks for continuity between each selected

range switch connector terminals.

Range Switch Logic Table

DTC P0706 Transmission Range Switch (Mode Switch) Performance

Range

Position

Range Switch Pin

ABCP(G)

Park ON OFF OFF ON

Reverse ON ON OFF OFF

Neutral OFF ON OFF ON

D4 OFF ON ON OFF

D3 ON ON ON ON

2ONOFFONOFF

LOFFOFFONON

Illegal OFF OFF OFF OFF

Illegal OFF OFF OFF ON

Step Action Yes No

1 Perform the following checks:

• The transmission linkage from the select lever to the manual

valve is adjusted properly.

• Diagnostic circuit check.

Were the checks performed? Go to Step 2 —

2 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. Select each transmission range: DL, D2, D3, D4, N, R, and

Does each selected transmission range match the scan tool

“Range Switch” display?

Go to Diagnostic

Aids Go to Step 3

3 Are all range switch pin displays incorrect? Go to Step 4 Go to Step 5

4 Check fuse and wiring to the 8–way connector terminal 5(D) for

opens.

Refer to Mode Switch in Automatic Transmission (4L30–E)

section.

If no problem was found, replace the range switch.

Is the replacement complete? Go to Step 8 —

5 1. Disconnect the 8–way range switch connector.

2. Using ohmmeter, check continuity between terminal 5(D) and

respectively terminals 3(G), 6(C), 7(B) and 8(A) of the 8–way

range switch connector.

3. Move shift selector lever through all positions and compare

results with“Range Switch Logic Table”.

Is one range switch pin display incorrect? Go to Step 6 Go to Step 7

6 Check the affected wiring and connector, and repair.

Is the repair complete? Go to Step 8 —

7 Check the Powertrain Control Module (PCM) connectors for poor

connection.

If no problem was found, replace the PCM.

Is the replacement complete? Go to Step 8 —

8 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and road test the vehicle.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input

D07RW029

Circuit Description

The TFT sensor is a thermister that controls the signal

voltage to the PCM. The PCM supplies a 5–volt

reference signal to the sensor on circuit RED/BLK–

GRN/RED. When the transmission fluid is cold, the

sensor resistance is high. The PCM detects high signal

voltage. As the transmission fluid temperature

increases to the normal operating temperature of 100°C

(212°F), the sensor resistance becomes less and the

voltage decreases to 1.5 to 2 volts. With transmission

fluid over temperature and DTC P0218 also set, check

the transmission cooling system.

This DTC detects a continuous short to ground in the

TFT signal circuit or the TFT sensor. This is a type “D”

DTC.

Conditions For Setting The DTC

• Battery voltage is between 10 and 16 volts.

• Ignition is“on”.

• TFT sensor indicating a voltage less than 0.4 volts.

• All conditions met for 20 seconds.

Action Taken When The DTC Sets

• Transmission default temperature will be:

80°C (176°F) if engine temperature code is set.

100°C (212°F) if engine temperature is warm.

80°C (176°F) if engine run time is greater than 5

minutes.

21°C (69.8°F) if engine run time is less than 5

minutes.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Check harness routing for a potential short to ground

in circuit RED/BLK–GRN/RED. Scan tool TFT display

should rise steadily to about 100°C (212°F), then

stabilize.

• Inspect the wiring for poor electrical connection at the

PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• The temperature to resistance value scale may be

used to test the TFT sensor at the various

temperature levels to evaluate the possibility of a

“skewed” (mis–scaled) sensor.

A “skewed” sensor could result in delayed garage

shifts or TCC complaints.

• Verify customer driving habits, trailer towing, etc.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks for a short to ground or a “skewed”

sensor.

3. This test checks for an internal fault within the

transmission by creating an open.

Resistance Chart

DTC P0712 Transmission Fluid Temperature (TFT) Sensor Circuit Low Input

°C°F Resistance (kW)

–40 –40 672

032 65

20 68 25

80 176 2.5

120 248 0.78

150 304 0.37

Step Action Yes No

1 Perform the transmission fluid checking procedure. Refer to

Checking Transmission Fluid Level and Condition in Automatic

Transmission (4L30–E) section.

Was the fluid checking procedure performed?

Go to Step 2

Refer to Checking

Transmission Fluid

Level and

Condition in

Automatic

Transmission

(4L30–E) section

2 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Does the scan tool display a TFT sensor signal voltage less than

0.4 volts? Go to Step 3

Go to Diagnostic

Aids

3 1. Turn the ignition“off”.

2. Disconnect the transmission 16–way connector H–53.

3. Turn the ignition“on”.

Does the TFT signal voltage change to match the voltage 4.92

volts? Go to Step 4 Go to Step 9

4 Using the J39200 DVOM, measure the resistance between

terminals 3(C) and 5 (D).

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 5

5 1. Disconnect the transmission 5–way connector M–6.

2. Using the J39200 DVOM, measure the resistance between

terminals 3(C) and 5(D).

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 6

6 1. Remove the transmission oil pan. Refer to Transmission Oil

Temperature Sensor (Adapter Case) in Automatic

Transmission (4L30–E) section.

2. Check the internal wiring harness for a short to ground.

Was a problem found? Go to Step 8 Go to Step 7

7 1. Disconnect the internal wiring harness at the TFT sensor.

2. Measure the resistance of the TFT sensor.

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 8

8 Replace the TFT Sensor.

Is the replacement complete? Go to Step 12 —

9 Check circuit RED/BLK–GRN/RED for a short to ground.

Was a problem found? Go to Step 12 Go to Step 10

10 Check the PCM for faulty connections.

Was a problem found? Go to Step 12 Go to Step 11

11 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 12 —

12 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

TFT sensor indicates a voltage greater than 0.33 volts for 2

seconds.

2. Review the scan tool“DTC info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input

D07RW029

Circuit Description

The TFT sensor is a thermistor that controls the signal

voltage to the PCM. The PCM supplies a 5–volt

reference signal to the sensor on circuit RED/BLK–

GRN/RED. When the transmission fluid is cold, the

sensor resistance is high and the PCM will sense high

signal voltage. As the transmission fluid temperature

warms to the normal operating temperature of 100°C

(212°F), the sensor resistance becomes less and the

voltage decreases to about 1.5 to 2 volts.

This DTC detects a continuous open or short to power

in the TFT signal circuit or the TFT sensor. This is a

type “D” DTC.

Conditions For Setting The DTC

• Battery voltage is between 10 and 16 volts.

• Ignition is“on”.

• TFT sensor indicating a voltage greater than 4.86

volts.

• All conditions met for 20 seconds.

Action Taken When The DTC Sets

• Transmission default temperature will be:

80°C (176°F) if engine temperature code is set.

100°C (212°F) if engine temperature is warm.

80°C (176°F) if engine run time is greater than 5

minutes.

21°C (69.8°F) if engine run time is less than 5

minutes.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal

tension as well. Also check for a chafed wire that

could short to bare metal or other wiring. Inspect for

a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• Scan tool displays transmission fluid temperature in

degrees. After transmission is operating, the

temperature should rise steadily to about 100°C

(212°F), then stabilize.

• The temperature to resistance value scale may be

used to check the TFT sensor at the various

temperature levels to evaluate the possibility of a

“skewed” (mis–scaled) sensor.

A “skewed” sensor could result in hard shifts or TCC

complaints.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This check verifies problem in the TFT sensor circuit.

3. This test simulates a TFT sensor DTC P0712. If the

PCM recognizes the low signal voltage (high

temperature), and the scan tool displays 146°C

(295°F) or greater, the PCM and wiring are OK.

5. This test checks the TFT sensor and internal wiring

harness.

Resistance Chart

DTC P0713 Transmission Fluid Temperature (TFT) Sensor Circuit High Input

°C°F Resistance (kW)

–40 –40 672

032 65

20 68 25

80 176 2.5

120 248 0.78

150 304 0.37

Step Action Yes No

1 Perform the transmission fluid checking procedure.

Refer to Checking Transmission Fluid Level and Condition in

Automatic Transmission (4L30–E) section.

Was the fluid checking procedure performed?

Go to Step 2

Refer to Checking

Transmission Fluid

Level and

Condition in

Automatic

Transmission

(4L30–E) section

2 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Does the scan tool display a TFT sensor signal voltage greater

than 4.86 volts? Go to Step 3

Go to Diagnostic

Aids

3 1. Turn the ignition“off”.

2. Disconnect the transmission 16–way connector H–53.

3. Install a fused jumper wire from terminal 3(C) to 5(D) on the

engine harness.

4. Turn the ignition“on”.

Does the TFT signal voltage drop to less than 0.4 volts? Go to Step 4 Go to Step 9

4 1. Turn the ignition“off”.

2. Using the J39200 DVOM, measure the resistance between

terminals 3(C) and 5(D).

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 5

5 1. Disconnect the transmission 5–way connector M–6.

2. Using the J39200 DVOM, measure the resistance between

terminals 3(C) and 5(D).

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 6

6 1. Remove the transmission oil pan.

2. Check the internal wiring harness for an open. Refer to

Transmission Oil Temperature Sensor (Adapter Case) in

Automatic Transmission (4L30–E) section.

Was a problem found and corrected? Go to Step 13 Go to Step 7

7 1. Disconnect the internal wiring harness at the TFT sensor.

2. Measure the resistance of the TFT sensor.

Is the resistance within specifications? (See Resistance Chart.)

Go to Diagnostic

Aids Go to Step 8

8 Replace TFT sensor. Refer to Transmission Oil Temperature

Sensor (Adapter Case) in Automatic Transmission (4L30–E)

section.

Is the replacement complete? Go to Step 13 —

9 Check circuit RED/BLK–GRN/RED for an open or short to B+.

Was a problem found? Go to Step 13 Go to Step 10

10 Check circuit GRY–GRN for an open.

Was a problem found? Go to Step 13 Go to Step 11

11 Check the PCM for faulty or intermittent connections.

Was a problem found? Go to Step 13 Go to Step 12

12 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 13 —

13 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

2. TFT sensor indicates a voltage less than 4.92 volts for 2

seconds.

3. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0719 TCC Brake Switch Circuit High (Stuck On)

D07RW032

Circuit Description

The TCC brake switch is used to indicate brake pedal

status. The normally opened brake switch signal

voltage circuit is opened.

Brake switch supplies a B+ signal on circuit GRN/YEL

to the PCM when the brakes are applied. The PCM

uses this signal to deenergize the TCC solenoid when

the brakes are applied.

This DTC detects a closed brake switch during

accelerations. This is a type “D” DTC.

Conditions For Setting The DTC

• No OSS DTCs P0722 or P0723.

• The PCM detects a closed brake switch/circuit (12

volts) for 2 seconds, and the following events occur

seven consecutive times: vehicle speed is less than 8

km/h (5 mph); then vehicle speed is between 8 and

32 km/h (5 and 20 mph) for 4 seconds; then vehicle

speed is greater than 32 km/h (20 mph) for 4

seconds.

Action Taken When The DTC Sets

• If throttle opening is greater than 10% and vehicle

speed is greater than 45 km/h (28 mph), then

disregard brake switch contingency for TCC off

mode.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the PCM and TCC brake switch. Look for possible

bent, backed out, deformed or damaged terminals.

Check for weak terminal tension as well. Also check

for a chafed wire that could short to bare metal or

other wiring. Inspect for a broken wire inside the

insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• Check customer driving habits and/or unusual driving

conditions (i.e. stop and go, highway).

• Check brake switch for proper mounting and

adjustment.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks for voltage at the brake switch.

5. This test checks the brake switch.

8. This test checks circuit GRN/YEL at the PCM.

DTC P0719 TCC Brake Switch Circuit High (Stuck On)

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”. If ABS code

is set, check applicable fuse.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. Apply then release the brake pedal.

Does the scan tool display “TCC Brake Switch” as “closed” with

the brake pedal applied, and then display “open” when the brake

pedal is released?

Go to Diagnostic

Aids Go to Step 2

2 1. Connect the test light to ground.

2. Back probe ignition feed circuit terminal B13–1 at the brake

switch.

Is the test light“on”? Go to Step 3 Go to Step 4

3 1. Connect the test light to ground.

2. Back probe circuit terminal B13–4 at the brake switch.

Is the test light“off”? Go to Step 7 Go to Step 5

4 Repair the open in battery feed circuit terminal B13–1 to the

brake switch.

If fuse is open, check circuit terminal B13–4 for a short to ground.

Is the repair complete? Go to Step 13 —

5 Disconnect brake switch connector B–13 and ignition switch“on”.

Is the test light“on”? Go to Step 8 Go to Step 6

6 Check the brake switch short (B13–1 and B13–4).

Was a problem found? Go to Step 9 Go to Step 10

7 Check circuit terminal B13–4 for a short to voltage.

Ignition switch“on”.

Is the test light“on”? Go to Step 8 Go to Step 10

8 1. Disconnect the J3 (BLUE) PCM connector.

2. Check circuit terminal B13–4 for a short to voltage.

Was a problem found? Go to Step 13 Go to Step 10

9 Replace the brake switch.

Is the replacement complete? Go to Step 13 —

10 1. Turn the ignition“off”.

2. Reconnect the J3 (BLUE) PCM connector.

3. Turn the ignition“on”.

Does the scan tool display “TCC Brake Switch” as “open” with

the brake applied, then display “closed” with the brake pedal

released?

Go to Diagnostic

Aids Go to Step 11

11 Check the PCM for faulty or intermittent connections.

Was a problem found and corrected? Go to Step 13 Go to Step 12

12 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 13 —

13 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

The PCM brake switch signal must indicate 0 volts for 1

seconds with the brake pedal applied.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0722 Transmission Output Speed Sensor (OSS) Low Input

D07RW006

Circuit Description

Output speed information is provided to the PCM by the

OSS, which is a permanent magnet (PM) generator.

The PM generator produces a pulsing AC voltage. The

AC voltage level and number of pulses increases as the

speed of the vehicle increases. The PCM then converts

the pulsing voltage to output speed, which is used for

calculations. The vehicle speed can be displayed with a

scan tool.

This DTC detects a low output speed when there is a

high engine speed in a drive gear range. This is a type

“C” DTC.

Conditions For Setting The DTC

• No MAP DTCs P0107 or P0108, P0106, P1106,

P1107.

• No TPS DTCs P0122 or P0123.

• Not in Park or Neutral.

• TP angle is greater than 10%.

• Engine vacuum is between 0 and 70kPa.

• Engine speed is between 3,000 and 7,000 rpm.

• Transmission output speed is less than 0 rpm.

• All conditions met for 5 seconds.

Action Taken When The DTC Sets

• Fixed to 4th gear.

• Maximum line pressure.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool. The DTC will be cleared from

history when the vehicle has achieved 40 warmup

cycles without a failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• An OSS DTC P0722 will set when no output speed is

at detected at start off.

• Inspect the wiring for poor electrical connection at the

PCM. Look for possible bent, backed out, deformed

or damaged terminals. Check for weak terminal

tension as well. Also check for a chafed wire that

could short to bare metal or other wiring. Inspect for

a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

4. This test checks the OSS circuit.

5. This test checks the integrity of the OSS.

7. This test checks the 5–volt and ground circuit of the

PCM.

DTC P0722 Transmission Output Speed Sensor (OSS) Low Input

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. Raise the drive wheels.

5. Start the engine.

6. Place the transmission in any drive range.

With the drive wheels rotating, does the “Trans Output Speed”

increase with the drive wheel speed?

Go to Diagnostic

Aids Go to Step 2

2 Does the speedometer work? Go to Step 3 Go to Step 4

3 Check for the most current and/or incorrect calibration.

Is the calibration current? Go to Step 16 Go to Step 4

4 1. Turn the ignition“off”.

2. Disconnect the J3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

harness connector terminals J3–E1 and J3–E2.

Is the reading 3,000 ohms? Go to Step 5 Go to Step 6

5 1. Select AC volts.

2. Rotate the rear wheels, ensuring the driveshaft is turning.

Is the voltage greater than 0.5 volts? Go to Step 7 Go to Step 8

6 Inspect circuits RED and WHT for a poor connection or an open

circuit.

Was a problem found? Go to Step 17 Go to Step 8

7 1. Reconnect the J3 (BLUE) PCM connector.

2. Disconnect the OSS harness from the OSS.

3. With the engine“off”, turn the ignition“on”.

4. Using the J 39200 DVOM, measure the voltage at the OSS

harness connector terminals M15–1 and M15–2.

Is the reading between 4.0 to 5.1 volts? Go to Step 16 Go to Step 10

8 1. Remove the OSS.

2. Check the output shaft speed sensor rotor for damage or

misalignment. Refer to Speed Sensor (Extension Housing) in

Automatic Transmission (4L30–E) section.

Was a problem found? Go to Step 17 Go to Step 9

9 Replace the OSS.

Is the replacement complete? Go to Step 17 —

10 Was the reading in step 7 less than 4.0 volts? Go to Step 12 Go to Step 11

11 Was the reading in step 7 greater than 5.1 volts? Go to Step 15 —

12 Using the J 39200 DVOM to chassis ground, measure the

voltage on circuit RED.

Is the reading between 4.0 to 5.1 volts? Go to Step 13 Go to Step 14

13 Repair the open in circuit WHT.

Is the repair complete? Go to Step 17 —

14 Check circuit RED for a short to ground or open.

Was a problem found and corrected? Go to Step 17 Go to Step 16

15 Repair the short to B+ in circuit RED.

Is the repair complete? Go to Step 17 —

16 Replace the PCM. Refer to Powertrain Control Module (PCM) in

automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 17 —

17 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle under the

following conditions:

Transmission output speed is greater than 101 rpm for 3

seconds.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0723 Transmission Output Speed Sensor (OSS) Intermittent

D07RW006

Circuit Description

Output speed information is provided to the PCM by the

OSS, which is a permanent magnet (PM) generator.

The PM generator produces a pulsing AC voltage. The

AC voltage level and number of pulses increases as the

speed of the vehicle increases. The PCM then converts

the pulsing voltage to output speed, which is used for

calculations. The vehicle speed can be displayed with a

scan tool.

This DTC detects a low output speed when there is a

high engine speed in a drive gear range. This is a type

“C” DTC.

Conditions For Setting The DTC

In Park or Neutral:

• Transmission output speed change is greater than

10,000 rpm.

• Conditions met for 6 seconds.

• Engine running time is greater than 2 seconds.

Not in Park or Neutral:

• Transmission output speed change is greater than

512 rpm.

• Conditions met for 0.075 seconds

• Engine running time is greater than 2 seconds.

• Engine vacuum is less than 70 kPa.

• Output speed is greater than 1,380 rpm for 1 second.

• NORAW–NOLAST < 60 rpm for 6 seconds.

NORAW: Latest raw data of output shaft speed.

NOLAST: Filtered pervious data of output speed.

Action Taken When The DTC Sets

• Fixed to 4th gear.

• Maximum line pressure.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• A OSS DTC P0723 will set when output speed has

been detected and is lost.

• Inspect the wiring for poor electrical connection at the

PCM. Look for possible bent, backed out, deformed

or damaged terminals. Check for weak terminal

tension as well. Also check for a chafed wire that

could short to bare metal or other wiring. Inspect for

a broken wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

4. This test checks the OSS circuit.

5. This test checks the integrity of the OSS.

7. This test checks the 5–volt and ground circuit of the

PCM.

DTC P0723 Transmission Output Speed Sensor (OSS) Intermittent

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. Raise the drive wheels.

5. Start the engine.

6. Place the transmission in any drive range.

With the drive wheels rotating, does the “Trans Output Speed”

increase with the drive wheel speed?

Go to Diagnostic

Aids Go to Step 2

2 Does the speedometer work? Go to Step 3 Go to Step 4

3 Check for the most current and/or incorrect calibration.

Is the calibration current? Go to Step 16 Go to Step 4

4 1. Turn the ignition“off”.

2. Disconnect the J3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

harness connector terminals J3–E1 and J3–E2.

Is the reading 3,000 ohms? Go to Step 5 Go to Step 6

5 1. Select AC volts.

2. Rotate the rear wheels, ensuring the driveshaft is turning.

Is the voltage greater than 0.5 volts? Go to Step 7 Go to Step 8

6 Inspect circuits RED and WHT for a poor connection or an open

circuit.

Was a problem found? Go to Step 17 Go to Step 8

7 1. Reconnect the J3 (BLUE) PCM connector.

2. Disconnect the OSS harness from the OSS.

3. With the engine“off”, turn the ignition“on”.

4. Using the J 39200 DVOM, measure the voltage at the OSS

harness connector terminals M15–1 and M15–2.

Is the reading between 4.0 to 5.1 volts? Go to Step 16 Go to Step 10

8 1. Remove the OSS.

2. Check the output shaft speed sensor rotor for damage or

misalignment. Refer to Speed Sensor (Extension Housing) in

Automatic Transmission (4L30–E) section.

Was a problem found? Go to Step 17 Go to Step 9

9 Replace the OSS.

Is the replacement complete? Go to Step 17 —

10 Was the reading in step 7 less than 4.0 volts? Go to Step 12 Go to Step 11

11 Was the reading in step 7 greater than 5.1 volts? Go to Step 15 —

12 Using the J 39200 DVOM to chassis ground, measure the

voltage on circuit RED.

Is the reading between 4.0 to 5.1 volts? Go to Step 13 Go to Step 14

13 Repair the open in circuit WHT.

Is the repair complete? Go to Step 17 —

14 Check circuit RED for a short to ground or open.

Was a problem found and corrected? Go to Step 17 Go to Step 16

15 Repair the short to B+ in circuit RED.

Is the repair complete? Go to Step 17 —

16 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 17 —

17 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle under the

following conditions:

Transmission output speed is greater than 101 rpm for 3

seconds.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0730 Transmission Incorrect Gear Ratio

D07RT015

Circuit Description

• The Powertrain Control Module (PCM) calculates the

slippage of the converter and transmission based

upon the engine speed, the output speed, and the

current gear ratio.

• The slippage of the converter at a high enough

engine speed is low. The transmission should not

slip more than a given value when there is no shift.

• This DTC detects a slip at each gear. This is a type

“C” DTC.

Conditions For Setting The DTC

• No Output Speed Sensor DTC(s) P0722, P0723.

• Not in Park, Neutral, or Reverse.

• Engine speed is greater than 3,500 rpm.

• 3 seconds since upshift.

• 3 seconds since downshift.

• 3 seconds since garage shift (N®D).

• And one of the following conditions occur:

– Slip is greater than 508 rpm in 1st gear.

– Slip is greater than 468 rpm in 2nd gear.

– Slip is greater than 449 rpm on 3rd gear.

– Slip is greater than 440 rpm on 4th gear.

• All conditions met for 5.5 seconds.

Action Taken When The DTC Sets

• Maximum line pressure.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn “off” the CHECK TRANS Lamp

after three consecutive ignition cycles without a

failure reported.

• The DTC can be cleared from PCM memory by using

a scan tool.

• The DTC can also be cleared from memory when the

vehicle has made 40 warmup cycles without a failure

reported.

• The PCM will cancel the DTC Actions Taken items

when the fault conditions no longer exist and the

ignition is cycles “off” long enough to power down the

PCM.

Diagnostic Aids

• Check for intermittent output speed sensor circuit

problems.

• Check for possible incorrect calibration. (PCM part

No., tire specification, and rear axle ratio)

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This step checks for possible low fluid level causing

slipping resulting in an undefined gear ratio.

3. This step checks for correct gear ratios for

commanded gears.

4. This step checks for low line pressure.

DTC P0730 Transmission Incorrect Gear Ratio

Step Action Yes No

1 Visually inspect the transmission cooling system for fluid leaks.

• Refer to Chart 16: Possible Causes of Transmission Fluid

Leaks of Mechanical/Hydraulic Diagnosis Symptoms Index in

Automatic Transmission (4L30–E) section

Was condition found and corrected? Go to Step 6 Go to Step 2

2 Refer to Checking Transmission Fluid Level and Condition in

Automatic Transmission (4L30–E) section.

Has transmission fluid checking procedure been performed?

Go to Step 3

Go to Checking

Transmission Fluid

Level and

Condition in

Automatic

Transmission

(4L30–E) section

3 1. Install the scan tool.

2. Turn the ignition switch to the “on” position.

3. Engine not running.

NOTE: Before clearing DTC(s) use the scan tool to record the

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

4. Record the Failure Record data.

5. Use the scan tool snapshot mode to record transmission gear

ratios.

6. Drive vehicle in transmission gear ranges L, 2, 3, and D with

the engine speed is greater than 3,500 rpm for 5.5 seconds.

7. Record each transmission gear.

1st:2.73 – 2.99

2nd:1.54 – 1.71

3rd:0.93 – 1.05

4th:0.66 – 0.78

Does commanded gear ratio match ranges as shown?

Refer to Diagnostic

Aids Go to Step 4

4 Perform line pressure check.

• Refer to Line Pressure Test in Automatic Transmission (4L30–

E) section.

Was condition found and corrected? Go to Step 6 Go to Step 5

5 Check for possible clutch slippage.

• Refer to Chart 6: Diagnostic Trouble Code (DTC) P0730 of

Mechanical/Hydraulic Diagnosis Symptoms Index in Automatic

Transmission (4L30–E) section.

Was condition found and corrected? Go to Step 6 —

6 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear info” function.

2. Operate the vehicle under the following conditions:

• Drive the vehicle in D4 with the engine speed greater than

3,500 rpm to obtain anyone of the following gear ratios for

seven seconds.

1st 1:2.73 – 1:2.99

2nd 1:1.54 – 1:1.71

3rd 1:0.93 – 1:1.05

4th 1:0.66 – 1:0.78

Has the last test failed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit Electrical

D07RW008

Circuit Description

The PCS is a PCM–controlled device used to regulate

transmission line pressure. The PCM compares TPS

voltage, engine rpm, and other inputs to determine the

line pressure appropriate for a given load. The PCM will

regulate the pressure by applying a varying amperage

to the PCS. The applied amperage can vary from 0.1

to 1 amp, and is monitored by the PCM.

This DTC detects a continuous open or short to ground

in the PCS circuit or the PCS. This is a type “C” DTC.

Conditions For Setting The DTC

• Battery voltage is between 10 and 16 volts.

• The PCM detects that the different between

commanded and actual current is 200 milliampere

(mA) for over 1 second.

Action Taken When the DTC Sets

• Maximum line pressure.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn “off” the CHECK TRANS Lamp

after three consecutive ignition cycles without a

failure reported.

• The DTC can be cleared from PCM history by using a

scan tool.

• The DTC will be cleared from memory when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

PCM and at the transmission 5–way connector. Look

for possible bent, backed out, deformed or damaged

terminals. Check for weak terminal tension as well.

Also check for a chafed wire that could short to bare

metal or other wiring. Inspect for a broken wire inside

the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

1. This test checks the ability of the PCM to command

the PCS.

2. This test checks the PCS and internal wiring harness

for incorrect resistance.

DTC P0748 Pressure Control Solenoid (PCS) (Force Motor) Circuit Electrical

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

4. While the engine is operating, put the transmission in Park.

5. Using the scan tool, apply 0.1 amp through 1.0 amp while

observing “PC Ref. Current” and“PC Act. Current”.

Is the “PC Act. Current” reading always within 0.16 amp?

Go to Diagnostic

Aids Go to Step 2

2 1. Turn the ignition“off”.

2. Disconnect the transmission 5–way connector M–6.

3. Using the J39200 DVOM, measure the resistance between

terminals M6–2(B) and M6–1(E).

Is the resistance within 3–7 ohms? Go to Step 6 Go to Step 3

3 1. Remove the transmission oil pan. Refer to Solenoid (Adapter

Case Valve Body) in Automatic Transmission (4L30–E)

section.

2. Disconnect the internal wiring harness at the PCS.

3. Measure the resistance of the PCS.

Is the resistance within 3–7 ohms? Go to Step 5 Go to Step 4

4 Replace the PCS.

Is the replacement complete? Go to Step 9 —

5 Repair the internal wiring harness for an open.

Is the repair complete? Go to Step 9 —

6 Inspect/repair circuits J3–E4, M6–2(B), J3–E3, and M6–1(E).

Was a problem found? Go to Step 9 Go to Step 7

7 Inspect/repair circuits J3–E4, M6–2(B), J3–E3, and M6–1(E) for

a short to ground or poor connections.

Was a problem found? Go to Step 9 Go to Step 8

8 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 9 —

9 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

The PCS duty cycle is not at its electrical high or low limit.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P0753 Shift Solenoid A Electrical

D07RW009

Circuit Description

• The shift solenoid A is a simple on/off solenoid

located in the main case valve body. The solenoid is

the normally closed type. In second or third gear, the

Powertrain Control Module (PCM) energizes the

solenoid to open a fluid inlet port. When the port is

open, fluid pressure actuates the shift valve.

• The solenoid is activated by current. This current is

produced by applying a voltage to one side (the High

side) and a ground to the other side (Low side).

• The High Side Driver (HSD) is a circuit of the PCM

that acts as a switch between the solenoids and the

supply voltage. The High side of the solenoid is

permanently supplied with voltage, except in

BACKUP MODE or when ignition is off the HSD is

turned off.

This DTC detects a continuous open or short to ground

in the shift solenoid A circuit or the shift solenoid A.

This is a type “C” DTC.

Conditions For Setting The DTC

• Ignition is“on”, Engine“run”.

• Battery voltage is between 10 and 16 volts.

• The PCM commands the solenoid “on” and the

voltage remains high (B+) or the PCM commands the

solenoid “off” and the voltage remains low (zero

volts).

• All conditions met for 0.33 seconds.

Action Taken When The DTC Sets

• Maximum line pressure.

• Immediate landing to 4th gear.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

• An open ignition feed circuit can cause multiple DTCs

to set.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks for power to the shift solenoid A from

the ignition through the PCM.

4. This test measures the resistance of the component.

8. This test checks the function of the shift solenoid A

and the transmission internal wiring harness.

Shift Solenoid Status Chart

DTC P0753 Shift Solenoid A Electrical

Gear Shift solenoid A Shift solenoid B

1st OFF ON

2nd ON ON

3rd ON OFF

4th OFF OFF

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“on”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Were DTCs P0753, P0758, P1860 set? Go to Step 2

Go to Diagnostic

Aids

2 1. Turn the ignition“on”.

2. Using the J39200 DVOM, measure the voltage between

PCM connector terminals J3–E14 and J2–C8 (GND).

Is the voltage within 10–12 volts? Go to Step 3 Go to Step 4

3 1. Turn the ignition“off”.

2. Disconnect the J3 (BLUE) PCM connector.

3. Turn the ignition“on”.

4. Using the J39200 DVOM, measure the voltage between

PCM connector terminals J3–F14 and ground.

Is the voltage within 10 – 12 volts? Go to Step 10 Go to Step 4

4 1. Turn the ignition“off”.

2. Disconnect the J3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J3–E14 and J3–F14.

Is the resistance within 18 – 20 ohms? Go to Step 5 Go to Step 6

5 1. Disconnect the J1 (RED) and J2 (WHITE) PCM connectors.

2. Using the J39200 DVOM, check a continuity between PCM

terminals J3–F14 and ground.

Is there a continuity? Go to Step 11 Go to Step 7

6 1. Disconnect the 16–way harness connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminals H53–14 and H53–15.

Is the resistance within 18–20 ohms? Go to Step 13 Go to Step 8

7 Using the J39200 DVOM, check a continuity between J3 (BLUE)

PCM terminal E14 and ground.

Is there a continuity? Go to Step 12 Go to Step 9

8 1. Disconnect the transmission main case 4 pin connector M–7.

2. Using the J39200 DVOM, measure the resistance between

terminals M7–3(D) and M7–4(C).

Is the resistance within 18–20 ohms? Go to Step 14 Go to Step 15

9 Check every connection at the PCM connector.

Was a problem found? Go to Step 17 Go to Step 16

10 The wiring harness between PCM connector terminals J3–F14

and transmission harness terminal M7–3(D) is shorted to voltage.

Was a problem found and corrected? Go to Step 18 —

11 The wiring harness between PCM connector terminal

J3–F14 and transmission harness terminal M7–3(D) is shorted to

ground.

Was a problem found and corrected? Go to Step 18 —

12 The wiring harness between PCM connector terminals J3–E14

and transmission harness terminal M7–4(C) is shorted to ground.

Was a problem found and corrected? Go to Step 18 —

13 The wiring harness between PCM connector J3 and transmission

16–way connector H–53 is open or poor connection.

Was a problem found and corrected? Go to Step 18 —

14 The wiring harness between transmission 16–way connector H–

53 and transmission main case connector M–7 is open or has a

poor connection.

Was a problem found and corrected? Go to Step 18 —

15 The shift solenoid A is faulty.

Replace the shift solenoid A. Refer to Solenoid (Main Case Valve

Body) in Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 18 —

16 The PCM may be faulty.

Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 18 —

17 Repair the PCM connector connection.

Was a problem found and corrected? Go to Step 18 —

18 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle under the

following conditions:

• The shift solenoid A is commanded “on” and voltage drops

to zero.

• The shift solenoid A is commanded “off” and voltage

increases to B+.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified

Exit DTC table

Step Action Yes No

DTC P0758 Shift Solenoid B Electrical

D07RW009

Circuit Description

• The shift solenoid B is a simple on/off solenoid

located in the main case valve body. It is normally

open. When the port is open, fluid pressure actuates

the shift valve. In first or second gear, the Powertrain

Control Module (PCM) energizes the solenoid to

close a fluid inlet port.

• The solenoid is activated by current. This current is

procuded by applying a voltage to one side (the High

side) and a ground to the other side (Low side).

• The High Side Driver (HSD) is a circuit of the PCM

that acts as a switch between the solenoids and the

supply voltage. The High side of the solenoid is

permanently supplied with voltage. In BACKUP

MODE or when the ignition is off, the HSD is turned

off.

This DTC detects a continuous open or short to ground

in the shift solenoid B circuit or shift solenoid B. This is

a type “C” DTC.

Conditions For Setting The DTC

• Ignition is“on”, Engine“run”.

• Battery voltage is between 10 and 16 volts.

• The PCM commands the solenoid “on” and the

voltage remains high (B+) or the PCM commands the

solenoid “off” and the voltage remains low (zero

volts).

• All conditions met for 0.33 seconds.

Action Taken When The DTC Sets

• Fixed to 4th gear.

• Maximum line pressure.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

4. This test measures the resistance of the component.

6. This test checks the function of the shift solenoid B

and the transmission internal wiring harness.

10.This test checks for power to the shift solenoid B

from the ignition through the PCM.

Shift Solenoid Status Chart

DTC P0758 Shift Solenoid B Electrical

Gear Shift solenoid A Shift solenoid B

1st OFF ON

2nd ON ON

3rd ON OFF

4th OFF OFF

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“on”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Were DTCs P0753, P0758, P1860 set? Go to Step 3 Go to Step 2

2 1. The engine“on”.

2. Apply brake pedal and select transmission range“D”.

3. Press and hold down the winter switch and select

transmission mode“winter”.

Does the scan tool display DTC P0758 at 3rd gear? Go to Step 7

Go to Diagnostic

Aids

3 1. Turn the ignition“off”.

2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.

3. Turn the ignition“on”.

4. Using the J39200 DVOM, measure the voltage between

PCM connector terminals J2–C2 and J2–C8.

Is the voltage within 10 – 12 volts? Go to Step 14 Go to Step 4

4 1. Turn the ignition“off”.

2. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J2–C2 and J3–E14.

Is the resistance within 18 – 20 ohms? Go to Step 15 Go to Step 5

5 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminals H53–16 and H53–15.

Is the resistance within 18 – 20 ohms? Go to Step 16 Go to Step 6

6 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, measure the resistance between

terminals M7–1(A) and M7–4(C).

Is the resistance within 18 – 20 ohms? Go to Step 17 Go to Step 18

7 1. Turn the ignition“off”.

2. Disconnect the J2 (WHITE) and J3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J2–C2 and J3–E14.

Is the resistance within 18 – 20 ohms? Go to Step 8 Go to Step 9

8 Using the J39200 DVOM, check a continuity between PCM

connector terminal J2–C2 and ground.

Is there a continuity? Go to Step 19 Go to Step 10

9 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminals H53–16 and H53–15.

Is the resistance within 18–20 ohms? Go to Step 20 Go to Step 11

10 Using the J39200 DVOM, check a continuity between PCM

connector terminal J3–E14 and ground.

Is there a continuity? Go to Step 21 Go to Step 12

11 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, measure the resistance between

terminals M7–1(A) and M7–4(C).

Is the resistance within 18 – 20 ohms? Go to Step 22 Go to Step 23

12 Check every connection of the PCM and transmission 16–way

connector H–53.

Was a problem found and corrected? Go to Step 25 Go to Step 13

13 1. Connect the J2 (WHITE) and J3 (BLUE) PCM connectors to

the PCM.

2. Turn the ignition“on”, the engine“on”.

3. Repeat Step 2.

Does the scan tool display DTC P0758 at 3rd gear? Go to Step 24

Go to Diagnostic

Aids

14 The wiring harness between PCM connector terminal

J2–C2 and transmission main case terminal M7–1(A) is shorted

to voltage.

Was a problem found and corrected? Go to Step 25 —

15 The PCM internal terminal J2–C2 is shorted to voltage.

Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 25 —

16 The wiring harness between PCM connector and transmission

16–way connector is shorted.

Was a problem found and corrected? Go to Step 25 —

17 The wiring harness between transmission 16–way connector and

transmission main case connector is shorted.

Was a problem found and corrected? Go to Step 25 —

18 The shift solenoid B is faulty, or the internal wiring harness from

the shift solenoid B is shorted.

Was a problem found and corrected? Go to Step 25 —

19 The wiring harness between PCM connector terminal

J2–C2 and transmission main case connector terminal M7–1(A)

is shorted to ground.

Was a problem found and corrected? Go to Step 25 —

20 The wiring harness between PCM connector terminal J2–C2 and

transmission 16–way connector terminal H53–16, or between

PCM connector terminal J3–E14 and 16–way connector terminal

H53–15 is open.

Was a problem found and corrected? Go to Step 25 —

21 The wiring harness between PCM connector terminal J3–E14

and transmission main case connector terminal M7–4(C) is

shorted to ground.

Was a problem found and corrected? Go to Step 25 —

Step Action Yes No

22 The wiring harness between transmission 16–way connector

terminal H53–16 and transmission main case connector terminal

M7–1(A), or between H53–15 and M7–4(C) is open.

Was a problem found and corrected? Go to Step 25 —

23 The internal wiring harness from the shift solenoid B is open, or

the shift solenoid B is faulty.

Was a problem found and corrected? Go to Step 25 —

24 Replace the PCM.

Is the replacement complete? Go to Step 25 —

25 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle under the

following conditions:

• The shift solenoid B is commanded “on” and voltage drop

to zero.

• The shift solenoid B is commanded “off” and voltage

increases to B+.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P1790 ROM Transmission Side Bad Check Sum

Circuit Description

Transmission Side Read Only Memory (ROM) and

Electronically Erasable Programmable Read Only

Memory (EEPROM) is an electronic circuit that controls

the transmission control in the Powertrain Control

Module (PCM).

This DTC detects a check sum error. This is a type “C”

DTC.

Conditions For Setting The DTC

• Detects check sum error for 1 second.

Action Taken When The DTC Sets

• Maximum line pressure.

• Immediate landing to 4th gear.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

DTC P1790 ROM Transmission Side Bad Check Sum

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Was DTC P1790 set? Go to Step 4 Go to Step 2

2 Was DTC P1792 set? Go to Step 3 —

3 1. Remove the PCM. Refer to Powertrain Control Module

(PCM) in Automatic Transmission (4L30–E) section.

2. Using the ITCS, make a reprogramming the transmission

EEPROM.

Was the reprogramming complete? Go to Step 5 —

4 Replace the PCM.

Is the replacement complete? Go to Step 5 —

5 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P1792 EEPROM Transmission Side Bad Check Sum

Circuit Description

Transmission Side Read Only Memory (ROM) and

Electronically Erasable Programmable Read Only

Memory (EEPROM) is an electronic circuit that controls

the transmission control in the Powertrain Control

Module (PCM).

This DTC detects a check sum error. This is a type “C”

DTC.

Conditions For Setting The DTC

• Detects check sum error for 1 second.

Action Taken When The DTC Sets

• Maximum line pressure.

• Immediate landing to 4th gear.

• Inhibit TCC engagement.

• The PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

• The PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

DTC P1792 EEPROM Transmission Side Check Bad Check Sum

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“off”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Was DTC P1790 set? Go to Step 4 Go to Step 2

2 Was DTC P1792 set? Go to Step 3 —

3 1. Remove the PCM. Refer to Powertrain Control Module

(PCM) in Automatic Transmission (4L30–E) section.

2. Using the ITCS, make a reprogramming the transmission

EEPROM.

Was the reprogramming complete? Go to Step 5 —

4 Replace the PCM.

Is the replacement complete? Go to Step 5 —

5 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and operate the vehicle.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P1835 Kickdown Switch Always On

D07RW033

Circuit Description

• When the driver presses the accelerator pedal down

fully, the kickdown switch closes, sending a ground

signal to the Powertrain Control Module (PCM).

• This information is used to perform shifts at high

engine speed.

• When the kickdown switch is closed, the Throttle

Position Sensor (TPS) is already is at 100%.

• This DTC detects a closed kickdown switch when TP

angle is less than 70%.

• This is a type “D” DTC.

Conditions For Setting The DTC

• No TPS DTCs P0122 or P0123.

• TP angle is less than 70%.

• Kickdown switch is“on”.

• All conditions met for 1 second.

Action Taken When The DTC Sets.

• Kickdown mode control is off.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Check the wiring harness for a short to ground

between the PCM and kickdown switch.

• Check the kickdown switch for failure.

• Check kickdown adjustment.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

1. This test checks for short to ground or kickdown

switch failure.

3. This test checks for regulation kickdown switch.

DTC P1835 Kickdown Switch Always On

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“on”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Does the scan tool display “Kickdown switch” “low”(closed

switch)? Go to Step 2 Go to Step 3

2 1. Turn the ignition“off”.

2. Disconnect the J3 (BLUE) PCM connector.

3. Using the J39200 DVOM, check a continuity between PCM

connector terminal J3–F11 and ground.

Is there a continuity? Go to Step 4 Go to Step 7

3 The TP angle goes from 0% to 100% with the accelerator pedal

depressed.

Is the kickdown switch “on” when TP angle is below 70%? Go to Step 5

Go to Diagnostic

Aids

4 1. Disconnect the kickdown switch connector B–10.

2. Using the J39200 DVOM, check a continuity between

terminals B10–1 and B10–2.

Is there a continuity? Go to Step 6 Go to Step 8

5 Adjust the kickdown switch.

Is the kickdown switch “on” when TP angle is above 95%? Go to Step 9 —

6 Replace the kickdown switch.

Is the replacement complete? Go to Step 9 —

7 Replace the PCM. Refer to Powertrain Control Module (PCM) in

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 9 —

8 Repair the short to ground in circuit LT BLUE.

Is the repair complete? Go to Step 9 —

9 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following condition

is met:

The torque converter stator temperature switch circuit does

not indicate a hot mode when the transmission fluid

temperature is less than 60°C (140°F) for at least 5 seconds.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

DTC P1850 Brake Band Apply Solenoid Malfunction

D07RW009

Circuit Description

• The brake band apply solenoid is a normally open

solenoid which controls the flow of fluid for brake

band application. The Powertrain Control Module

(PCM) uses Pulse Width Modulation (PWM) and

changes the duty cycle to control the solenoid. The

PCM turns the solenoid on (energized) and off

(deenergized) at a constant frequency. The length of

time the solenoid is energized during each on/off

cycle is called the pulse width. By varying or

“modulating” the pulse width, the solenoid output

pressure is changed. Since the solenoid is normally

open, increasing the pulse width increases the duty

cycle and decreases the output pressure. PWM

control provides smooth band application without an

accumulator. The band is only applied in first and

second gears.

• In the event of an electrical failure (open), the

solenoid regulates at the maximum oil flow (0% duty

cycle).

• The solenoid is activated by current. This current is

produced by applying a voltage to one side (the High

side) and a ground to the other side (Low side).

• The High Side Driver (HSD) is a circuit of the PCM

that acts as a switch between the solenoids and the

supply voltage. The High side of the solenoid is

permanently supplied with voltage. When the ignition

is off, the HSD is turned off.

This DTC detects a continuous open or short to ground

in the brake band apply solenoid circuit or the brake

band apply solenoid. This is a type “D” DTC.

Conditions For Setting The DTC

• Battery voltage is between 10 and 16 volts.

• Ignition is“on”, Engine“run”.

• The PCM commands the solenoid “on” and the

voltage remains high (B+) or the PCM commands the

solenoid “off” and the voltage remains low (zero

volts).

• All conditions met in 1.3 seconds.

Action Taken When The DTC Sets

• Inhibit brake band apply solenoid.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connection at the

PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks for power to the brake band apply

solenoid from the ignition through the PCM.

3. This test checks the resistance of the transmission

internal wiring harness and brake band apply

solenoid.

4. This test checks the ability of the PCM and wiring to

control the ground circuit.

DTC P1850 Brake Band Apply Solenoid Malfunction

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“on”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when the

“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Were DTCs P0753, P0758 set? Go to Step 2 Go to Step 3

2 Using the J39200 DVOM, back probe between PCM connector

terminals J3–E14 and J2–C8.

Is the voltage between 10 to 12 volts? Go to Step 4 Go to Step 5

3 1. Turn the ignition“off”.

2. Disconnect the J1 (RED) and J3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J1–A16 and J3–E14.

Is the resistance within 10–12 ohms? Go to Step 11 Go to Step 12

4 Using the J39200 DVOM, back probe between PCM connector

terminals J1–A16 and J2–C8.

Is the voltage between 10 to 12 volts? Go to Step 25 Go to Step 3

5 1. Turn the ignition“off”.

2. Disconnect the J1 (RED) and J3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, check continuity between PCM

terminal J3–E14 and ground.

Is there a continuity? Go to Step 6 Go to Step 8

6 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, check continuity between

connector H53–13 and ground.

Is there a continuity? Go to Step 7 Go to Step 16

7 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, check continuity between the

terminal M7–2(B) and ground.

Is there a continuity? Go to Step 17 Go to Step 18

8 1. Disconnect the J1 (RED) PCM Connector.

2. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J1–A16 and J3–E14.

Is the resistance within 10–12 ohms? Go to Step 25 Go to Step 9

9 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminal H53–13 and H53–15.

Is the resistance within 10–12 ohms? Go to Step 16 Go to Step 10

10 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, measure the resistance between

terminals M7–2(B) and M7–4(C).

Is the resistance within 10–12 ohms? Go to Step 19 Go to Step 20

11 Using the J39200 DVOM, check continuity between PCM

terminal J1–A16 and ground.

Is there a continuity? Go to Step 13 Go to Step 25

12 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminal H53–13 and H53–15.

Is the resistance within 10–12 ohms? Go to Step 23 Go to Step 14

13 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, check continuity between terminal

H53–13 and ground.

Is there a continuity? Go to Step 15 Go to Step 21

14 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, measure the resistance between

terminals M7–2(B) and M7–4(C).

Is the resistance within 10–12 ohms? Go to Step 24 Go to Step 20

15 1. Disconnect the transmission main case connector M–7.

2. Using the J39200 DVOM, check continuity between the

terminal M7–2(B) and ground.

Is there a continuity? Go to Step 17 Go to Step 22

16 The wiring harness between PCM terminal J3–E14 and

transmission 16–way connector terminal H53–15 is open.

Was a problem found and corrected? Go to Step 26 —

17 The brake band apply solenoid is faulty, or the internal wiring

harness from the brake band apply solenoid is shorted to ground.

Was a problem found and corrected? Go to Step 26 —

18 The wiring harness between the transmission 16–way connector

terminal H53–15 and the transmission main case connector

terminal M7–4(C) is shorted to ground.

Was a problem found and corrected? Go to Step 26 —

19 The wiring harness between the transmission 16–way connector

terminal H53–15 and the transmission main case connector

terminal M7–4(C) is open.

Was a problem found and corrected? Go to Step 26 —

20 The brake band apply solenoid is faulty, or the internal wiring

harness from the brake band apply solenoid is open.

Was a problem found and corrected? Go to Step 26 —

21 The wiring harness between the PCM connector terminal J1–A16

and transmission 16–way connector terminal H53–13 is shorted

to ground.

Was a problem found and corrected? Go to Step 26 —

22 The wiring harness between the transmission 16–way connector

terminal H53–13 and the transmission main case connector

terminal M7–2(B) is shorted to ground.

Was a problem found and corrected? Go to Step 26 —

Step Action Yes No

23 The wiring harness between the PCM connector terminal J1–A16

and the 16–way connector terminal H53–13 is open.

Was a problem found and corrected? Go to Step 26 —

24 The wiring harness between the transmission 16–way connector

terminal H53–13 and the transmission main case connector

terminal M7–2(B) is open.

Was a problem found and corrected? Go to Step 26 —

25 Check every connection at the PCM.

If OK, replace the PCM. Refer to Powertrain Control Module

(PCM) in Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 26 —

26 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

• The brake band apply solenoid is commanded “on” and

the volts drop to zero.

• The brake band apply solenoid is commanded “off” and the

volts increase to B+.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

DTC P1860 TCC Solenoid Electrical

D07RW010

Circuit Description

The PCM allows current to flow through the solenoid

coil according to the duty cycle (percentage of “on” and

“off” time). This current flow through the solenoid coil

creates a magnetic field that magnetizes the solid core.

The magnetized core attracts the check ball to seat

against spring pressure. This blocks the exhaust for the

TCC signal fluid and allows 2–3 drive fluid to feed to

TCC signal circuit. The TCC signal fluid pressure acts

on the TCC regulator valve to regulate line pressure and

to apply fluid pressure to the torque converter clutch

shift valve. When the TCC shift valve is in the apply

position, regulated apply fluid pressure is directed

through the TCC valve to apply the torque converter

clutch. The TCC solenoid is used in conjunction with

the TCC solenoid to regulate fluid to the torque

converter. The TCC solenoid is attached to the valve

body within the transmission.

This DTC detects a continuous open or short to ground

or ignition in the TCC circuit or the TCC solenoid. This

is a type “D” DTC.

Conditions For Setting The DTC

• Battery voltage is between 10 and 16 volts.

• No shift solenoid A DTC P0753.

• No shift solenoid B DTC P0758.

• Ignition is“on”, Engine“run”.

• The PCM commands the solenoid “on” and the

voltage remains low (zero volts).

• The PCM commands the solenoid “off” and the

voltage remains high (B+).

• All conditions met for 0.25 seconds.

Action Taken When The DTC Sets

• Inhibit TCC engagement.

• The PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

• The DTC can be cleared from the PCM history by

using a scan tool.

• The DTC will be cleared from history when the

vehicle has achieved 40 warmup cycles without a

failure reported.

• The PCM will cancel the DTC default actions when

the fault no longer exists and the ignition is cycled

“off” long enough to power down the PCM.

Diagnostic Aids

• Inspect the wiring for poor electrical connections at

the PCM and at the transmission 16–way connector.

Look for possible bent, backed out, deformed or

damaged terminals. Check for weak terminal tension

as well. Also check for a chafed wire that could short

to bare metal or other wiring. Inspect for a broken

wire inside the insulation.

• When diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

2. This test checks for voltage to the solenoid.

3. This test checks the ability of the PCM and wiring to

control the ignition circuit.

8. This test checks the resistance of the TCC solenoid

and the internal wiring harness.

DTC P1860 TCC Solenoid Electrical

Step Action Yes No

1 1. Install the scan tool.

2. With the engine“on”, turn the ignition switch“on”.

NOTE: Before clearing DTC(s), use the scan tool to record

“Failure Records” for reference, as data will be lost when

the“Clear Info” function is used.

3. Record the DTC“Failure Records”.

Go to Step 2 Go to Step 3

2 Using the J39200 DVOM, back probe between PCM connector

terminals J2–D2 and J2–C8.

Is the voltage 0 ? Go to Step 4 Go to Step 5

3 1. Apply brake pedal and select transmission range“D”.

2. Do a test drive, and increase the vehicle speed to TCC “on”

at 4th.

Does the scan tool display DTC P1860 at TCC“ON”? Go to Step 9

Go to Diagnostic

Aids

4 1. Turn the ignition“off”.

2. Disconnect the J2 (WHITE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals J2–D2 and J2–C8.

Is the resistance within 18 – 20 ohms? Go to Step 6 Go to Step 7

5 The wiring harness between PCM connector terminal J2–D2 and

transmission adapter case connector terminal M6–4(A) is

shorted to voltage.

Was a problem found and corrected? Go to Step 18 Go to Step 19

6 Intermittent condition.

Check the wiring harness and terminals between PCM connector

J2 and transmission adapter case connector M–6.

Was a problem found and corrected? Go to Step 18 Go to Step 19

7 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminal H53–8 and ground.

Is the resistance within 18 – 20 ohms? Go to Step 15 Go to Step 8

8 1. Disconnect the transmission adapter case connector M–6.

2. Using the J39200 DVOM, measure the resistance between

terminal M6–4(A) and ground.

Is the resistance within 18 – 20 ohms? Go to Step 16 Go to Step 17

9 1. Turn the ignition“off”.

2. Disconnect the J2 (WHITE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

terminals J2–D2 and J2–C8.

Is the resistance within 18 – 20 ohms? Go to Step 18 Go to Step 10

10 1. Disconnect the transmission 16–way connector H–53.

2. Using the J39200 DVOM, measure the resistance between

terminal H53–8 and ground.

Is the resistance within 18–20 ohms? Go to Step 12 Go to Step 11

11 1. Disconnect the transmission adapter case connector M–6.

2. Using the J39200 DVOM, measure the resistance between

terminal M6–4(A) and ground.

Is the resistance within 18–20 ohms? Go to Step 13 Go to Step 14

12 The wiring harness between PCM connector terminal J2–D2 and

transmission 16–way connector terminal H53–8 is shorted to

ground.

Was a problem found and corrected? Go to Step 20 —

13 The wiring harness between transmission 16–way connector H–

53 and adapter case connector M–6 is shorted to ground.

Was a problem found and corrected? Go to Step 20 —

14 The TCC solenoid is faulty, or the internal wiring harness from the

TCC solenoid is shorted to ground.

Was a problem found and corrected? Go to Step 20 —

15 The wiring harness between PCM connector terminal J2–D2 and

transmission 16–way connector terminal H53–8 is open.

Was a problem found and corrected? Go to Step 20 —

16 The wiring harness between transmission 16–way connector

terminal H53–8 and adapter case terminal M6–4(A) is open.

Was a problem found and corrected? Go to Step 20 —

17 The TCC solenoid is faulty, or the internal wiring harness from the

TCC solenoid is open.

Was a problem found and corrected? Go to Step 20 —

18 Check every connection at the PCM.

If OK, replace the PCM. Refer to Powertrain Control Module

(PCM) in Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 20 —

19 Check the PCM connector terminal J2–D2, transmission 16–way

connector terminal H53–8 and transmission adapter case

connector terminal M6–4(A).

Was a problem found and corrected? Go to Step 20 —

20 1. After the repair is complete, use the scan tool to select“DTC”,

then “Clear Info” function and ensure the following conditions

are met:

• The TCC solenoid is commanded “on” and the volts

increase to B+.

• The TCC solenoid is commanded “off” and the volts drop

to zero.

2. Review the scan tool“DTC Info”.

Has the last test failed or is the current DTC displayed?

Begin diagnosis

again

Go to Step 1

Repair verified Exit

DTC table

Step Action Yes No

Transmission Fluid Temperature (TFT) Sensor Specifications

Temperature Temperature Minimum

Resistance

Nominal

Resistance

Maximum

Resistance

Signal

°C°FWWWVolts

-40 -40 600500 664200 731100 5.00

-30 -22 319800 350400 382400 4.65

-20 -4 177400 192700 208600 4.41

-10 14 102200 110100 118300 4.00

0 32 60870 65110 69450 3.52

10 50 37410 39750 42120 2.98

20 68 23660 24980 26300 2.40

30 86 15270 16120 16970 1.85

40 104 10040 10660 11290 1.43

50 122 6758 7211 7673 4.29

60 140 4645 4980 5324 4.04

70 158 3255 3506 3765 3.69

80 176 2323 2513 2710 3.34

90 194 1685 1831 1982 3.04

100 212 1242 1355 1472 2.58

110 230 929 1017 1109 2.24

120 248 704 773 846 1.97

130 266 540 595 653 1.67

140 284 419 464 511 1.42

150 302 329 365 403 1.16