SECTION 7A1 - 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

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

Tech 2 OBD II Connection

F0: Transmission Data

F1: PC Solenoid Data

Flashing Code

OBD II Diagnostic Management System

16 – Terminal Data Link Connector (DLC)

Malfunction Indicator Lamp (MIL)

Types Of Diagnostic Trouble Code (DTCs)

Clear DTC

DTC Check

PCM Precaution

Information On PCM

Intermittent Conditions

Transmission and PCM Identification

Isuzu Frontera

Diagnostic Trouble Code (DTC)

Identification

DTC P0218/Flashing Code 71 Transmission

Fluid Over Temperature

DTC P0560/Flashing Code 72 System

Voltage Malfunction

DTC P0705/Flashing Code 73 Transmission

Range Switch (Mode Switch) Illegal Position

DTC P0706/Flashing Code 74 Transmission

Range Switch (Mode Switch) Performance

DTC P0712/Flashing Code 75 Transmission

Fluid Temperature (TFT) Sensor Circuit

Low Input

DTC P0713/Flashing Code 76 Transmission

Fluid Temperature (TFT) Sensor Circuit

High Input

DTC P0719/Flashing Code 77 TCC Brake

Switch Circuit High (Stuck On)

DTC P0722/Flashing Code 78 Transmission

Output Speed Sensor (OSS) Low Input

DTC P0723/Flashing Code 79 Transmission

Output Speed Sensor (OSS) Intermittent

DTC P0730/Flashing Code 81 Transmission

Incorrect Gear Ratio

DTC P0748/Flashing Code 82 Pressure

Control Solenoid (PCS) (Force Motor)

Circuit Electrical

DTC P0753/Flashing Code 83 Shift Solenoid

A Electrical

DTC P0758/Flashing Code 84 Shift Solenoid

B Electrical

DTC P1790/Flashing Code 85 ROM

Transmission Side Bad Check Sum

DTC P1792/Flashing Code 86 EEPROM

Transmission Side Bad Check Sum

DTC P1835/Flashing Code 87 Kickdown

Switch Always On

DTC P1850/Flashing Code 88 Brake Band

Apply Solenoid Malfunction

DTC P1860/Flashing Code 89 TCC

Solenoid Electrical

Circuit Diagram

Parts Location

Harness Connector Faces

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.

ISUZU will call out those fasteners that require a

replacement after removal. ISUZU 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:

DNormal mode –Normal shift pattern.

DWinter mode –Starts in 3rd gear to reduce slippage on

ice or snow.

DPower 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:

DA compact structure consisting of 2 sets of planetary

gears and flat torque converter.

DElectronic control selects the optimum shift mode

according to the driving conditions.

DElectronic control maintains the optimum hydraulic

pressure for clutch, band brake as well as

transmission so that shift feeling is improved.

DTwo sets of planetary gears reduce friction of power

train.

Also, a lockup mechanism in the torque converter

reduces fuel consumption.

DWide gear ratio and high torque rate of torque

converter provide excellent starting performance.

Electronic Control Diagram

C07RX008

Powertrain Control Module (PCM)

C07RW026

Control System Diagram

C07RY00059

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.

Shift Mode Control

F07RT035

Gear Shift Control

F07RT034

Winter Drive Mode

1.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 7 mph (11 km/h) or less.

c. Transmission oil temperature is 120°C (248°F) or

less.

d. Kickdown switch is of f.

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 21mph (34 km/h) or more

for 1 second or more

b. When transmission oil temperature reaches

140°C (284°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:

Select lever position Gear Ratio Selected

D4 (Fourth)

Manual 3 4 (Fourth)

Manual 2 3 (Third)

Manual L 1 (First)

R Reverse

Shifts are firmer to prevent clutch slip and consequent

wear. The fault should be corrected as soon as possible.

Functions of Input / Output Components

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.

TMode 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.

GT/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.

SShift 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.

OTorque Converter

Clutch solenoid Controls clutch engagement/disengagement suited to the vehicle running

condition on the basis of PCM output.

DForce 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.

GPower 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.

LT/M monitor lamp

(“CHECK TRANS”) Informs the driver of failure in the system.

ATF warning lamp Lights when ATF oil temperature rises.

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.

821RY00064

Diagnostic Check

This test determines if the transmission or its input, or

output, connections, or sensors are failing.

1.Connect the Tech 2: GOTHROUGH Tech 2 OBD II

CONNECTION.

2.Turn on the ignition but not the engine.

3.Push “F0” on Tech 2 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 find the problem.

1. GOTHROUGH “CHECK TRANS” CHECK

2. IF it is flashing and the flash is 0.5 seconds ON

and 0.5 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

C07RY00058

“Check Trans” Check

1.Indicator 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.

821RY00064

Normal

C07RW047

2.Indicator is flashing and the flash is 0.5 seconds ON

and 0.5 seconds OFF always when ignition is on

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

malfunction. GOTO DIAGNOSTIC CHECK.

Abnormal

C07RY00058

3.Indicator 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 6 of connector

I–1 is shorted to ground.

3. Verify if the PCM connector C1 (RED) terminal

A14 is shorted to ground.

4. Verify that the instrument panel terminal 12 of

connector I–1 is connected to battery.

5. IF problem solved: GOTO CHECK TRANS

INDICATOR.

NO:Replace Powertrain Control Module (PCM).

4.Indicator 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 6 of connector

I–1 is shorted to battery or open.

3. Verify if the PCM connector C1 (RED) terminal

A14 is shorted to battery or open.

4. Verify that the instrument panel terminal 12 of

connector I–1 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).

D07RX015

Tech 2 OBD II Connection

In order to access OBD II Powertrain Control Module

(PCM) data, use of the Tech 2 scan tool kit (7000086) is

required.

1.The electronic diagnosis equipment is composed of:

1. Tech 2 hand–held scan tool unit (7000057) and

DLC cable (3000095).

901RW176

2. SAE 16/19 Pin Adapter (3000098)(1), RS232

Loop Back Connector (3000112)(2), and

PCMCIA Card (3000117)(3).

F07RW033

2.Connecting the Tech 2

901RW180

Legend

(1) PCMCIA Card

(2) RS 232 Loop Back Connector

(3) SAE 16/19 Adapter

(4) DLC Cable

(5) Tech 2

DBefore operating the Isuzu PCMCIA card with the

Tech 2, the following steps must be performed:

1. The Isuzu 2000 System PCMCIA card (1) inserts

into the Tech 2 (5).

2. Connect the SAE 16/19 adapter (3) to the DLC

cable (4).

3. Connect the DLC cable to the Tech 2 (5)

4. Mark sure the vehicle ignition is off.

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

vehicle DLC.

810RW317

6. The vehicle ignition turns on.

7. Verify the Tech 2 power up display.

060RW009

NOTE: The RS232 Loop back connector is only to use for

diagnosis of Tech 2 and refer to user guide of the Tech 2.

8. The power up screen is displayed when you

power up the tester with the Isuzu systems

PCMCIA card. Follow the operating procedure

below.

060RY027

060RY00169

Once the test vehicle has been identified an “Application

(Powertrain) Menu” screen appears. Please select the

appropriate application.

Data Display

When F1: Data Display is selected, a “Data Display

Menu” screen appears.

Please select either “Transmission Data” or “PC Solenoid

Data”.

060RX009

Function Tests (Reset Oil Life Monitor)

When F4: Function T ests is selected from the “Powertrain

Menu”, a “Reset Oil Life Monitor Menu” screen appears.

When the ATF has been replaced, select “F0” and reset

“Oil Life Monitor” data.

060RX056

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 T ransmission) RPM 0 RPM

AT Input Speed Ratio (Automatic T ransmission) 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 (Not used)

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) Aapprox. 1.0 A

PCS Actual Current (Pressure Control Solenoid) Aapprox. 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)

Flashing Code

1.A DTC (Flashing Code) can be displayed by the

Powertrain Control Module (PCM) by shorting

together terminals 6 and 4 or 5 (GND) of the Data Link

Connector (DLC) located right side of the drivers side

instrument panel.

810RW317

821RY00065

2.1. In case there is no DTC stored in memory. The

CHECK ENGINE indicator flashes Normal Code

“12” repeatedly.

2. In case there is DTC stored in memory. First,

Normal Code “12” is displayed three times and

then any other DTC‘s are displayed three times.

When all DTC‘s have been displayed they are

displayed again beginning from the first one.

3. Write down all codes numbers and GOTO DTC

CHECK.

C07RX006

OBD II Diagnostic Management System

Powertrain Control Module (PCM) Location

828RX004

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

PCM have also greatly increased. To accommodate this

expansion in diagnostic complexity, Isuzu 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.

FRONTERA 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 Tech 2,

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

right side of the driver’s side instrument panel. All

manufacturers must conform to this 16–terminal

standard. 810RW317

810RT022

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.)

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.

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 Tech 2:

1. Connect the Tech 2 if it is still not connected

GOTHROUGH Tech 2 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?”

a. When a malfunction remains as it is the Tech 2

displays “4L30E CODES NOT CLEARED”. This

means that the problem is still there or that the

recovery was not done. Please GOTO DTC

CHECK.

b. When a malfunction has been repaired and the

recovery is done the Tech 2 displays “4L30E

CODES CLEARED”.

2.IF you have no Tech 2:

To clear the DTC, remove Fuse “ECM” (F–13, 15A)

for at least 10 seconds.

826RX017

DTC Check

1.Diagnostic Trouble Codes (DTC) have been identified

by Tech 2.

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.The 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.

NOTICE: 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°F (185°C) 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 Tech 2 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. T erminals 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.Electromagnetic 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 F2: SNAPSHOT mode of the Tech 2 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

or, if you notice the reported symptom during the test

drive, trigger the snapshot manually.

After the snapshot has been triggered, command the

Tech 2 to play back the flow of data recorded from each of

the various sensors. Sign of an intermittent fault in a

sensor circuit is a 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.

VEHICLE Rr axle

Ratio

PCM TRANSMISSION

Type Engine

oISUZU Parts No. Calibration

Code Isuzu Part No. Model Code

Isuzu/

Frontera 3.2L V6 4.100 8–09356–159–0 G20 8–96018–004–3 FL (4×4)

Isuzu Frontera

240RX011

Diagnostic Trouble Code (DTC)

Identification

DTC

NUMBER FLASHING

CODE DTC NAME DTC TYPE “CHECK

TRANS”

P0218 71 Transmission Fluid Over Temperature D

P0560 72 System Voltage Malfunction C Flash

P0705 73 Transmission Range Switch (Mode Switch) Illegal

Position D

P0706 74 Transmission Range Switch (Mode Switch)

Performance D

P0712 75 Transmission Fluid Temperature (TFT) Sensor Circuit

Low Input D

P0713 76 Transmission Fluid Temperature (TFT) Sensor Circuit

High Input D

P0719 77 TCC Brake Switch Circuit High (Stuck ON) D

P0722 78 Transmission Output Speed Sensor (OSS) Low Input C Flash

P0723 79 Transmission Output Speed Sensor (OSS)

Intermittent C Flash

P0730 81 Transmission Incorrect Gear Ratio C Flash

P0748 82 Pressure Control Solenoid (PCS) (Force Motor)

Circuit Electrical C Flash

P0753 83 Shift Solenoid A Electrical C Flash

P0758 84 Shift Solenoid B Electrical C Flash

P1790 85 ROM Transmission Side Bad Check Sum C Flash

P1792 86 EEPROM Transmission Side Bad Check Sum C Flash

P1835 87 Kick Down Switch Always ON D

P1850 88 Brake Band Apply Solenoid Malfunction D

P1860 89 TCC Solenoid Electrical D

DTC TYPE DEFINITION

CFlashing Check Trans on 1st failure

DNo lamps

NOTE:On the following charts, refer to Powertrain

Control Module (PCM) section for Wiring System and the

Body and Accessories section for circuit diagram details,

parts location, and connector configuration.

DTC P0218/Flashing Code 71 Transmission Fluid Over Temperature

D07RX016

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 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

DNo TFT DTCs P0712 or P0713.

DTFT is greater than 135°C (275°F).

DAll conditions met for 21 seconds.

Action Taken When The DTC Sets

DHot mode TCC Shift Pattern.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

DATF Lamp ON. (greater than 145°C (293°F))

DDisable E–side TCC OFF request.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warm–up cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DCheck harness routing for a potential short to ground

in circuit GRN/RED.

DScan tool TFT sensor temperature should rise

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

DCheck 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.

DCheck for a possible torque converter stator problem.

DVerify 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/Flashing Code 71 Transmission Fluid Over Temperature

Step Action Yes No

1Perform the following checks:

DCheck for possible engine system problems.

DTransmission 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 —

21. 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 0.33 volts? Go to Step 3 Go to Diagnostic

Aids

31. Turn the ignition “off”.

2. Disconnect the transmission 16–way connector H–10

(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

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

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

51. Inspect the PCM for poor connections.

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

Is the replacement complete? Go to Step 6 —

61. 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/Flashing Code 72 System Voltage Malfunction

D07RX017

Circuit Description

Circuit RED/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:

DEngine speed is greater than 1,000 rpm.

DSystem voltage is less than 10 volts at a maximum

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

DSystem voltage is less than 7.3 volts at a minimum

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

DAll conditions met for 4 seconds.

System Voltage High:

DSystem voltage is greater than 16 volts for 2 seconds.

Action Taken When The DTC Sets

DFixed to 4th gear.

DMaximum line pressure.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DCharging 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.

DCheck for faulty connections at the starter solenoid or

fusible link.

DCheck for loose/damaged terminals at generator.

DCheck 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/Flashing Code 72 System Voltage Malfunction

Step Action Yes No

11. 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

2Start 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

31. 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

41. Turn the ignition switch “off”.

2. Disconnect the C1(RED) and C3 (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 C1–A4 and C3–E16.

Is there a voltage variance between the voltage measured at the

battery (taken in Step 1) and at terminals C1–A4 and C3–E16 that

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

5Repair the high resistance condition in circuit RED/WHT.

Was the circuit repaired? Go to Step 10 —

61. Disconnect the C3 (BLUE) PCM connector.

2. Measure the ignition voltage input at PCM connector terminals

C3–E16 and C3–F16.

Is there a voltage variance between the voltage measured at the

battery (taken in Step 1) and at terminals C3–E16 and C3–F16

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

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

Was the circuit repaired? Go to Step 10 —

8Check PCM connector terminals C1–A4, C3–E16 and C3–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

DTC P0560/Flashing Code 72 System Voltage Malfunction (Cont’d)

Step NoYesAction

9Replace 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/Flashing Code 73 Transmission Range Switch (Mode Switch) Illegal

Position

D07RX018

Circuit Description

DThe 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.

DThe 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–16

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

connected to ground.

DThe range switch is also used to provide the backup

lamp power in reverse. This is the reason why the

range switch is supplied through a 15A fuse (C–14).

This fuse can burn due to a short circuit in the back up

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

DRange switch illegal positions met for 5 seconds.

Action Taken When The DTC Sets

DDefault to D position.

DInhibit torque management.

DMaximum line pressure.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DRefer to accompanying chart for the normal range

signals and the illegal combinations.

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DRefer to the “Range Switch Logic Table”.

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

Range Range Switch Pin

Position A B C P(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

2 ON OFF ON OFF

L OFF OFF ON ON

Illegal OFF OFF OFF OFF

Illegal OFF OFF OFF ON

DTC P0705/Flashing Code 73 Transmission Range Switch (Mode Switch) Illegal

Position

Step Action Yes No

1Perform the following checks:

DThe transmission linkage from the select lever to the manual

valve is adjusted properly.

DDiagnostic circuit check.

Were the checks performed? Go to Step 2 —

21. 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: D1, D2, D3, D4, N, R, and P.

Does each selected transmission range match the scan tool

“Range Switch” display? Go to Diagnostic

Aids Go to Step 3

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

4Check 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 —

51. 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

6Check the affected wiring and connector, and repair.

Is the repair complete? Go to Step 8 —

7Check 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 —

81. 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

DTC P0706/Flashing Code 74 Transmission Range Switch (Mode Switch)

Performance

D07RX018

Circuit Description

DThe 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.

DThe 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–16

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

connected to ground.

DThe range switch is also used to provide the back up

lamp power in reverse. This is the reason why the

mode switch is supplied through a 15A fuse (C–14).

This fuse can burn due to a short circuit in the back up

lamp.

DThis 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):

DEngine is running.

DNo output speed DTCP0722, P0723.

DOutput speed greater than 3,200 RPM.

DRange switch indicates “R”.

DAll conditions met for 4 seconds.

Condition 2 (“P” or “N” bad position):

DEngine is running.

DNo TPS codes.

DEngine speed is less than 3,000 RPM.

DTP angle is greater than 20%.

DRange switch indicates “P” or “N”.

DAll conditions met for 4 seconds.

Action Taken When The DTC Sets

DDefault to “D” position.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DRefer to the accompanying chart for the normal range

signals and the illegal combinations.

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DRefer to the “Range Switch Logic Table”.

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

Range Range Switch Pin

Position A B C P(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

2 ON OFF ON OFF

L OFF OFF ON ON

Illegal OFF OFF OFF OFF

Illegal OFF OFF OFF ON

DTC P0706/Flashing Code 74 Transmission Range Switch (Mode Switch)

Performance

Step Action Yes No

1Perform the following checks:

DThe transmission linkage from the select lever to the manual

valve is adjusted properly.

DDiagnostic circuit check.

Were the checks performed? Go to Step 2 —

21. 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: D1, D2, D3, D4, N, R, and P.

Does each selected transmission range match the scan tool

“Range Switch” display? Go to Diagnostic

Aids Go to Step 3

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

4Check 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 —

51. 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

6Check the affected wiring and connector, and repair.

Is the repair complete? Go to Step 8 —

7Check 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 —

81. 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

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor

Circuit Low Input

D07RX016

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 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

DBattery voltage is between 10 and 16 volts.

DIgnition is “on”.

DTFT sensor indicating a voltage less than 0.4 volts.

DAll conditions met for 20 seconds.

Action Taken When The DTC Sets

DTransmission 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.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DCheck harness routing for a potential short to ground

in circuit GRN/RED. Scan tool TFT display should

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

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DThe 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.

DVerify 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

°C°FResistance (kW)

–40 –40 672

0 32 65

20 68 25

80 176 2.5

120 248 0.78

150 304 0.37

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor Circuit Low

Input

Step Action Yes No

1Perform 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

21. 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

31. Turn the ignition “off”.

2. Disconnect the transmission 16–way connector H–10.

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

4Using 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

51. 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

61. 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

71. 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

8Replace the TFT Sensor.

Is the replacement complete? Go to Step 12 —

DTC P0712/Flashing Code 75 Transmission Fluid Temperature (TFT) Sensor Circuit Low

Input (Cont’d)

Step NoYesAction

9Check circuit 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

DTC P0713/Flashing Code 76 Transmission Fluid Temperature (TFT) Sensor

Circuit High Input

D07RX016

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 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

DBattery voltage is between 10 and 16 volts.

DIgnition is “on”.

DTFT sensor indicating a voltage greater than 4.86

volts.

DAll conditions met for 20 seconds.

Action Taken When The DTC Sets

DTransmission 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.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DScan tool displays transmission fluid temperature in

degrees. After transmission is operating, the

temperature should rise steadily to about 100°C

(212°F), then stabilize.

DThe 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.

4. This test checks the TFT sensor and internal wiring

harness.

Resistance Chart

°C°FResistance (kW)

–40 –40 672

0 32 65

20 68 25

80 176 2.5

120 248 0.78

150 304 0.37

DTC P0713/Flashing Code 76 Transmission Fluid Temperature (TFT) Sensor Circuit High

Input

Step Action Yes No

1Perform 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

21. 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

31. Turn the ignition “off”.

2. Disconnect the transmission 16–way connector H–10.

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

41. 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

51. 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

61. 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

71. 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

DTC P0713/Flashing Code 76 Transmission Fluid Temperature (TFT) Sensor Circuit High

Input (Cont’d)

Step NoYesAction

8Replace TFT sensor. Refer to Transmission Oil Temperature

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

section.

Is the replacement complete? Go to Step 13 —

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

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

10 Check circuit 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:

TFT sensor indicates a voltage less than 4.92 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

DTC P0719/Flashing Code 77 TCC Brake Switch Circuit High (Stuck On)

D07RX019

Circuit Description

The 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 RED 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

DNo OSS DTCs P0722 or P0723.

DThe 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

DIf 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.

DThe PCM will not illuminate CHECK TRANS Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warm–up cycles without a failure

reported.

DThe 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

DInspect the wiring for poor electrical connections at

the PCM and 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.

DWhen diagnosing for a possible intermittent short or

open condition, move or massage the wiring harness

while observing test equipment for a change.

DCheck customer driving habits and/or unusual driving

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

DCheck 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 RED at the PCM.

DTC P0719/Flashing Code 77 TCC Brake Switch Circuit High (Stuck On)

Step Action Yes No

11. 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 “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

21. Connect the test light to ground.

2. Back probe ignition feed circuit terminal I18–1 at the brake

switch.

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

31. Connect the test light to ground.

2. Back probe circuit terminal I18–4 at the brake switch.

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

4Repair the open in battery feed circuit terminal I18–1 to the brake

switch.

If fuse is open, check circuit terminal I18–4 for a short to ground.

Is the repair complete? Go to Step 13 —

5Disconnect brake switch connector I–18 and ignition switch “on”.

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

6Check the brake switch short (I18–1 and I18–4).

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

7Check circuit terminal I18–4 for a short to voltage.

Ignition switch “on”.

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

81. Disconnect the C3 (BLUE) PCM connector.

2. Check circuit terminal I18–4 for a short to voltage.

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

9Replace the brake switch.

Is the replacement complete? Go to Step 13 —

10 1. Turn the ignition “off”.

2. Reconnect the C3 (BLUE) PCM connector.

3. Turn the ignition “on”.

Does the scan tool display “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

DTC P0719/Flashing Code 77 TCC Brake Switch Circuit High (Stuck On) (Cont’d)

Step NoYesAction

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 12 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

DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low

Input

D07RW022

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

DNo MAP DTCs P0107 or P0108, P0106, P1106,

P1107.

DNo TP DTCs P0122 or P0123.

DNot in Park or Neutral.

DTP angle is greater than 10%.

DEngine vacuum is between 0 and 70kPa.

DEngine speed is between 3000 and 7000 rpm.

DTransmission output speed is less than 0 rpm.

DAll conditions met for 5 seconds.

Action Taken When The DTC Sets

DFixed to 4th gear.

DMaximum line pressure.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe 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.

DThe 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

DAn OSS DTC P0722 will set when no output speed is

at detected at start off.

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move or massage the wiring harness

while observing test equipment for a change.

Test Description

The numbers below refer to the step numbers on the

diagnostic chart:

3. This test checks the OSS circuit.

4. This test checks the integrity of the OSS.

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

PCM.

DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low

Input

Step Action Yes No

11. 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

2Check for the most current and/or incorrect calibration.

Is the calibration current? Go to Step 15 Go to Step 3

31. Turn the ignition “off”.

2. Disconnect the C3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

harness connector terminals C3–E1 and C3–E2.

Is the reading 3000 ohms? Go to Step 4 Go to Step 5

41. Select AC volts.

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

Is the voltage greater than 0.5 volts? Go to Step 6 Go to Step 7

5Inspect circuits YEL and BRN for a poor connection or an open

circuit.

Was a problem found? Go to Step 16 Go to Step 7

61. Reconnect the C3 (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 15 Go to Step 9

71. 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 16 Go to Step 8

8Replace the OSS.

Is the replacement complete? Go to Step 16 —

9Was the reading in step 6 less than 4.0 volts? Go to Step 11 Go to Step 10

10 Was the reading in Step 6 greater than 5.1 volts? Go to Step 14 —

11 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 12 Go to Step 13

12 Repair the open in circuit BRN.

Is the repair complete? Go to Step 16 —

13 Check circuit YEL for a short to ground or open.

Was a problem found and corrected? Go to Step 16 Go to Step 15

DTC P0722/Flashing Code 78 Transmission Output Speed Sensor (OSS) Low

Input (Cont’d)

Step NoYesAction

14 Repair the short to B+ in circuit YEL.

Is the repair complete? Go to Step 16 —

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

automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 16 —

16 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:

DDrive the vehicle under steady acceleration above 10% TP

angle.

DTransmission 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

DTC P0723/Flashing Code 79 Transmission Output Speed Sensor (OSS)

Intermittent

D07RW022

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:

DTransmission output speed change is greater than

10000 rpm.

DConditions met for 6 seconds.

DEngine running time is greater than 2 seconds.

Not in Park or Neutral:

DTransmission output speed change is greater than

512 rpm.

DConditions met for 0.075 seconds

DEngine running time is greater than 2 seconds.

DEngine vacuum is less than 70 kPa.

DOutput speed is greater than 1380 rpm for 1 second.

DNORAW–NOLAST < 60 rpm for 6 seconds.

DNORAW: Latest raw data of output shaft speed.

DNOLAST: Fitered previous data of output speed.

Action Taken When The DTC Sets

DFixed to 4th gear.

DMaximum line pressure.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DA OSS DTC P0723 will set when output speed has

been detected and is lost.

DInspect 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.

DWhen 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:

3. This test checks the OSS circuit.

4. This test checks the integrity of the OSS.

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

PCM.

DTC P0723/Flashing Code 79 Transmission Output Speed Sensor (OSS)

Intermittent

Step Action Yes No

11. 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

2Check for the most current and/or incorrect calibration.

Is the calibration current? Go to Step 15 Go to Step 3

31. Turn the ignition “off”.

2. Disconnect the C3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

harness connector terminals C3–E1 and C3–E2.

Is the reading 3,000 ohms? Go to Step 4 Go to Step 5

41. Select AC volts.

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

Is the voltage greater than 0.5 volts? Go to Step 6 Go to Step 7

5Inspect circuits YEL and BRN for a poor connection or an open

circuit.

Was a problem found? Go to Step 16 Go to Step 7

61. Reconnect the C3 (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 15 Go to Step 9

71. 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 16 Go to Step 8

8Replace the OSS.

Is the replacement complete? Go to Step 16 —

9Was the reading in step 6 less than 4.0 volts? Go to Step 11 Go to Step 10

10 Was the reading in Step 6 greater than 5.1 volts? Go to Step 14 —

11 Using the J 39200 DVOM to chassis ground, measure the voltage

on circuit YEL.

Is the reading between 4.0 to 5.1 volts? Go to Step 12 Go to Step 13

12 Repair the open in circuit BRN.

Is the repair complete? Go to Step 16 —

13 Check circuit YEL for a short to ground or open.

Was a problem found and corrected? Go to Step 16 Go to Step 15

DTC P0723/Flashing Code 79 Transmission Output Speed Sensor (OSS)

Intermittent (Cont’d)

Step NoYesAction

14 Repair the short to B+ in circuit YEL.

Is the repair complete? Go to Step 16 —

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

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 16 —

16 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:

DDrive the vehicle under steady acceleration above 10% TP

angle.

DTransmission 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

DTC P0730/Flashing Code 81 Transmission Incorrect Gear Ratio

D07RT015

Circuit Description

DThe 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.

DThe 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.

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

“C” DTC.

Conditions For Setting The DTC

DNo Output Speed Sensor DTC(s) P0722, P0723.

DNot in Park, Neutral or Reverse.

DEngine speed is greater than 3500 rpm.

D3 seconds since upshift.

D3 seconds since downshift.

D3 seconds since garage shift (N→D).

DAnd one of the following conditions occur:

– Slip is greater than 753 rpm in 1st gear.

– Slip is greater than 713 rpm in 2nd gear.

– Slip is greater than 694 rpm on 3rd gear.

– Slip is greater than 685 rpm on 4th gear.

DAll conditions met for 5.5 seconds.

Action Taken When The DTC Sets

DMaximum line pressure.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn “off” the CHECK TRANS Lamp

after three consecutive ignition cycles without a

failure reported.

DThe 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.

DThe 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

DCheck for intermittent output speed sensor circuit

problems.

DCheck for possible incorrect calibration. (PCM part

No., tire specifications, 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/Flashing Code 81 Transmission Incorrect Gear Ratio

Step Action Yes No

1Visually inspect the transmission cooling system for fluid leaks.

DRefer 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

2Refer 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

31. 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 1, 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

4Perform line pressure check.

DRefer to Line Pressure Test in Automatic Transmission

(4L30–E) section.

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

5Check for possible clutch slippage.

DRefer 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 —

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

then “Clear info” function.

2. Operate the vehicle under the following conditions:

DDrive the vehicle in D4 with the engine speed greater than

3,500 rpm to obtain any one 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

DTC P0748/Flashing Code 82 Pressure Control Solenoid (PCS) (Force Motor)

Circuit Electrical

D07RX020

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

DBattery voltage is between 10 and 16 volts.

DThe PCM detects that the different between

commanded and actual current is 200 milliampere

(mA) for over 1 second.

Action Taken When the DTC Sets

DMaximum line pressure.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn “off” the CHECK TRANS Lamp

after three consecutive ignition cycles without a

failure reported.

DThe DTC can be cleared from PCM history by using a

scan tool.

DThe DTC will be cleared from memory when the

vehicle has achieved 40 warmup cycles without a

failure reported.

DThe 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

DInspect 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.

DWhen 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/Flashing Code 82 Pressure Control Solenoid (PCS) (Force Motor) Circuit

Electrical

Step Action Yes No

11. 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

21. 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

31. 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

4Replace the PCS.

Is the replacement complete? Go to Step 9 —

5Repair the internal wiring harness for an open.

Is the repair complete? Go to Step 9 —

6Inspect/repair circuits C3–E4, M6–2(B), C3–E3, M6–1(E).

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

7Inspect/repair circuits C3–E4, M6–2(B), C3–E3, M6–1(E) for a

short to ground or poor connections.

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

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

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 9 —

91. 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/Flashing Code 83 Shift Solenoid A Electrical

D07RW014

Circuit Description

DThe 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.

DThe solenoid is activated by a current. This current is

produced by applying a voltage to one side (the High

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

DThe 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

DIgnition is “on”, Engine “run”.

DBattery voltage is between 10 and 16 volts.

DThe 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).

DAll conditions met for 0.33 seconds.

Action Taken When The DTC Sets

DMaximum line pressure.

DImmediate landing to 4th gear.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen diagnosing for a possible intermittent short or

open condition, move the wiring harness while

observing test equipment for a change.

DAn open ignition feed circuit can cause multiple DTCs

to set.

DA shift solenoid B DTC P0756 could also set with a

shift solenoid A electrical failure.

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

Gear Shift solenoid A Shift solenoid B

1st OFF ON

2nd ON ON

3rd ON OFF

4th OFF OFF

DTC P0753/Flashing Code 83 Shift Solenoid A Electrical

Step Action Yes No

11. 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

21. Turn the ignition “on”.

2. Using the J39200 DVOM, measure the voltage between PCM

connector terminals C3–E14 and C2–C8 (GND).

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

31. Turn the ignition “off”.

2. Disconnect the C3 (BLUE) PCM connector.

3. Turn the ignition “on”.

4. Using the J39200 DVOM, measure the voltage between PCM

connector terminals C3–F14 and ground.

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

41. Turn the ignition “off”.

2. Disconnect the C3 (BLUE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals C3–E14 and C3–F14.

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

51. Disconnect the C1 (RED) and C2 (WHITE) PCM connectors.

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

terminals C3–F14 and ground.

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

61. Disconnect the 16–way harness connector H–10.

2. Using the J39200 DVOM, measure the resistance between

terminals H10–6 and H10–5.

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

7Using the J39200 DVOM, check a continuity between C3 (BLUE)

PCM terminal E14 and ground.

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

81. 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

DTC P0753/Flashing Code 83 Shift Solenoid A Electrical (Cont’d)

Step NoYesAction

9Check 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 C3–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 C3–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 C3 and transmission

16–way connector H–10 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–10 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 V alve

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:

DThe shift solenoid A is commanded “on” and the voltage

drops to zero.

DThe shift solenoid A is commanded “off” and the 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

DTC P0758/Flashing Code 84 Shift Solenoid B Electrical

D07RW014

Circuit Description

DThe 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.

DThe 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).

DThe 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

DIgnition is “on”, Engine “run”.

DBattery voltage is between 10 and 16 volts.

DThe 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).

DAll conditions met for 0.33 seconds.

Action Taken When The DTC Sets

DFixed to 4th gear.

DMaximum line pressure.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen 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

Gear Shift solenoid A Shift solenoid B

1st OFF ON

2nd ON ON

3rd ON OFF

4th OFF OFF

DTC P0758/Flashing Code 84 Shift Solenoid B Electrical

Step Action Yes No

11. 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

31. Turn the ignition “off”.

2. Disconnect the C2 (WHITE) and C3 (BLUE) PCM connectors.

3. Turn the ignition “on”.

4. Using the J39200 DVOM, measure the voltage between PCM

connector terminals C2–C2 and C2–C8.

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

41. Turn the ignition “off”.

2. Using the J39200 DVOM, measure the resistance between

PCM connector terminals C2–C2 and C3–E14.

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

51. Disconnect the transmission 16–way connector H–10.

2. Using the J39200 DVOM, measure the resistance between

terminals H10–12 and H10–5.

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

61. 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

71. Turn the ignition “off”.

2. Disconnect the C2 (WHITE) and C3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals C2–C2 and C3–E14.

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

8Using the J39200 DVOM, check a continuity between PCM

connector terminal C2–C2 and ground.

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

DTC P0758/Flashing Code 84 Shift Solenoid B Electrical (Cont’d)

Step NoYesAction

91. Disconnect the transmission 16–way connector H–10.

2. Using the J39200 DVOM, measure the resistance between

terminals H10–12 and H10–5.

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 C3–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–10.

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

13 1. Connect the C2 (WHITE) and C3 (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

C2–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 C2–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

C2–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 C2–C2 and

transmission 16–way connector terminal H10–12, or between

PCM connector terminal C3–E14 and 16–way connector terminal

H10–5 is open.

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

DTC P0758/Flashing Code 84 Shift Solenoid B Electrical (Cont’d)

Step NoYesAction

21 The wiring harness between PCM connector terminal C3–E14

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

shorted to ground.

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

22 The wiring harness between transmission 16–way connector

terminal H10–12 and transmission main case connector terminal

M7–1(A), or between H10–5 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:

DThe shift solenoid B is commanded “on” and voltage drops to

zero.

DThe 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

DTC P1790/Flashing Code 85 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 controls in the Powertrain Control

Module (PCM).

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

DTC.

Conditions For Setting The DTC

DDetects check sum error for 1 second.

Action Taken When The DTC Sets

DMaximum line pressure.

DImmediate landing to 4th gear.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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/Flashing Code 85 ROM Transmission Side Bad Check Sum

Step Action Yes No

11. 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

2Was DTC P1792 set? Go to Step 3 —

31. Remove the PCM. Refer to Powertrain Control Module (PCM)

in Automatic Transmission (4L30–E) section.

2. Using the ITCS reprogram the transmission EEPROM.

Was the reprogramming complete? Go to Step 5 —

4Replace the PCM.

Is the replacement complete? Go to Step 5 —

51. 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/Flashing Code 86 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 controls in the Powertrain Control

Module (PCM).

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

DTC.

Conditions For Setting The DTC

DDetects check sum error for 1 second.

Action Taken When The DTC Sets

DMaximum line pressure.

DImmediate landing to 4th gear.

DInhibit TCC engagement.

DThe PCM will illuminate the CHECK TRANS Lamp.

Conditions For Clearing The DTC/CHECK

TRANS Lamp

DThe PCM will turn off the CHECK TRANS Lamp after

three consecutive ignition cycles without a failure

reported.

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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/Flashing Code 86 EEPROM Transmission Side Bad Sum

Step Action Yes No

11. 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

2Was DTC P1792 set? Go to Step 3 —

31. Remove the PCM. Refer to Powertrain Control Module (PCM)

in Automatic Transmission (4L30–E) section.

2. Using the ITCS reprogram the transmission EEPROM.

Was the reprogramming complete? Go to Step 5 —

4Replace the PCM.

Is the replacement complete? Go to Step 5 —

51. 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/Flashing Code 87 Kickdown Switch Always On

D07RW015

Circuit Description

DWhen the driver presses the accelerator pedal down

fully, the kickdown switch closes, sending a ground

signal to the Powertrain Control Module (PCM).

DThis information is used to perform shifts at high

engine speed.

DWhen the kickdown switch is closed, the Throttle

Position Sensor (TPS) is already at 100%.

DThis DTC detects a closed kickdown switch when TP

angle is less than 70%.

DThis is a type “D” DTC.

Conditions For Setting The DTC

DNo TP DTCs P0122 or P0123.

DTP angle is less than 70%.

DKickdown switch is “on”.

DAll conditions met for 1 second.

Action Taken When The DTC Sets.

DKickdown mode control is off.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DCheck the wiring harness for a short to ground

between the PCM and kickdown switch.

DCheck the kickdown switch for failure.

DCheck 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/Flashing Code 87 Kickdown Switch Always On

Step Action Yes No

11. 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

21. Turn the ignition “off”.

2. Disconnect the C3 (BLUE) PCM connector.

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

connector terminal C3–F11 and ground.

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

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

depressed.

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

Aids

41. Disconnect the kickdown switch connector C–29.

2. Using the J39200 DVOM, check a continuity between

terminals C29–1 and C29–2.

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

5Adjust the kickdown switch.

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

6Replace the kickdown switch.

Is the replacement complete? Go to Step 9 —

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

Automatic Transmission (4L30–E) section.

Is the replacement complete? Go to Step 9 —

8Repair the short to ground in circuit LT BLUE.

Is the repair complete? Go to Step 9 —

91. 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/Flashing Code 88 Brake Band Apply Solenoid Malfunction

D07RW014

Circuit Description

DThe 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.

DIn the event of an electrical failure (open), the

solenoid regulates at the maximum oil flow (0% duty

cycle).

DThe solenoid is activated by a current. This current is

produced by applying a voltage to one side (the High

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

DThe 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

DBattery voltage is between 10 and 16 volts.

DIgnition is “on”, Engine “run”.

DThe 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).

DAll conditions met in 1.3 seconds.

Action Taken When The DTC Sets

DInhibit brake band apply solenoid.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen 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/Flashing Code 88 Brake Band Apply Solenoid Malfunction

Step Action Yes No

11. 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

2Using the J39200 DVOM, back probe between PCM connector

terminals C3–E14 and C2–C8.

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

31. Turn the ignition “off”.

2. Disconnect the C1 (RED) and C3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals C1–A16 and C3–E14.

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

4Using the J39200 DVOM, back probe between PCM connector

terminals C1–A16 and C2–C8.

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

51. Turn the ignition “off”.

2. Disconnect the C1 (RED) and C3 (BLUE) PCM connectors.

3. Using the J39200 DVOM, check continuity between PCM

terminal C3–E14 and ground.

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

61. Disconnect the transmission 16–way connector H–10.

2. Using the J39200 DVOM, check continuity between connector

H10–7 and ground.

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

71. 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

81. Disconnect the J1 (RED) PCM Connector.

2. Using the J39200 DVOM, measure the resistance between

the PCM connector terminals C1–A16 and C3–E14.

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

91. Disconnect the transmission 16–way connector H–10.

2. Using the J39200 DVOM, measure the resistance between

the terminal H10–7 and H10–5.

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

DTC P1850/Flashing Code 88 Brake Band Apply Solenoid Malfunction (Cont’d)

Step NoYesAction

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

2. Using the J39200 DVOM, measure the resistance between

the 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 C1–A16 and ground.

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

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

2. Using the J39200 DVOM, measure the resistance between

the terminal H10–7 and H10–5.

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

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

2. Using the J39200 DVOM, check continuity between terminal

H10–7 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

the 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 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 C3–E14 and

transmission 16–way connector terminal H10–5 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 H10–5 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 H10–5 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 C1–A16

and transmission 16–way connector terminal H10–7 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 H10–7 and the transmission main case connector

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

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

DTC P1850/Flashing Code 88 Brake Band Apply Solenoid Malfunction (Cont’d)

Step NoYesAction

23 The wiring harness between the PCM connector terminal C1–A16

and the 16–way connector terminal H10–7 is open.

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

24 The wiring harness between the transmission 16–way connector

terminal H10–7 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:

DThe brake band apply solenoid is commanded “on” and the

volts drop to zero.

DThe 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

DTC P1860/Flashing Code 89 TCC Solenoid Electrical

D07RW016

Circuit Description

The PCM allows current to flow through the solenoid coil.

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

DBattery voltage is between 10 and 16 volts.

DNo shift solenoid A DTCs P0753.

DNo shift solenoid B DTCs P0758.

DIgnition “on”. Engine “run”.

DThe PCM commands the solenoid “on” and the

voltage remains low (zero volts).

DThe PCM commands the solenoid “off” and the

voltage remains high (B+).

DAll conditions met for 0.25 seconds.

Action Taken When The DTC Sets

DInhibit TCC engagement.

DThe PCM will not illuminate the CHECK TRANS

Lamp.

Conditions For Clearing The DTC

DThe DTC can be cleared from the PCM history by

using a scan tool.

DThe DTC will be cleared from history when the vehicle

has achieved 40 warmup cycles without a failure

reported.

DThe 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

DInspect 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.

DWhen 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/Flashing Code 89 TCC Solenoid Electrical

Step Action Yes No

11. 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

2Using the J39200 DVOM, back probe between PCM connector

terminals C2–D2 and C2–C8.

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

31. 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

41. Turn the ignition “off”.

2. Disconnect the C2 (WHITE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

PCM connector terminals C2–D2 and C2–C8.

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

5The wiring harness between PCM connector terminal C2–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

6Intermittent 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

71. Disconnect the transmission 16–way connector H–10.

2. Using the J39200 DVOM, measure the resistance between

terminal H10–4 and ground.

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

81. 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

91. Turn the ignition “off”.

2. Disconnect the C2 (WHITE) PCM connector.

3. Using the J39200 DVOM, measure the resistance between

terminals C2–D2 and C2–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–10.

2. Using the J39200 DVOM, measure the resistance between

terminal H10–4 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

DTC P1860/Flashing Code 89 TCC Solenoid Electrical (Cont’d)

Step NoYesAction

12 The wiring harness between PCM connector terminal C2–D2 and

transmission 16–way connector terminal H10–4 is shorted to

ground.

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

13 The wiring harness between transmission 16–way connector

H–10 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 C2–D2 and

transmission 16–way connector terminal H10–4 is open.

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

16 The wiring harness between transmission 16–way connector

terminal H10–4 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 C2–D2, transmission 16–way

connector terminal H10–4 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:

DThe TCC solenoid is commanded “on” and the volts increase

to B+.

DThe 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

Circuit Diagram

D07RY00075

D07RY00076

Parts Location

D07RW075

Legend

(1) Connector X-8

(2) Connector X-13, X-14

(3) Data Link Connector C-34

(4) Connector I-1

(5) Connector I-9

(6) Connector I-18

(7) Powertrain Control Module (PCM) connector

C-1 (J1), C-2 (J2), C-3 (J3)

(8) Connector H-15, H-16, H-17

(9) Connector H-4, H-5, H-6

(10) Connector M-15

(11) Connector M-7

(12) Connector M-16

(13) Connector M-6

(14) Connector H-10, H-11

(15) Connector B-24

(16) Connector E-5

(17) Connector E-20

(18) Connector E-27

(19) Connector C-29

Harness Connector Faces

No. Connector face

B-24

C-1

(J1)

C-2

(J2)

C-3

(J3)

C-29

C-34

E-5

E-20

E-27

H-4

No. Connector face

H-5

H-6

H-10

H-11

H-14

H-15

H-16

H-17

I-1

I-9

No. Connector face

I-18

M-6

M-7

M-15

M-16

X-8