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Isuzu Trooper (1998-2002 year). Manual - part 756

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–9

Winter Drive Mode

1. Operation

The winter switch will operate when switched on after
all of the following conditions are present:

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

range.

b. Vehicle speed is 7 mph (11 km/h) or less.
c. Transmission oil temperature is 130

C (266

F) or

less.

d. Kickdown switch is off.
e. Accelerator opening is at 8% or less.

2. Cancel Release

1. Cancellation by driver

a. Turning off the winter drive mode switch
b. Shifting select position to “3”, “2”, or “L” (Winter

drive mode is not canceled by selecting “N”, “R”,
or “P” from “D”)

c. Ignition key is turned off.

2. Automatic cancellation

a. When vehicle runs at 19mph (30 km/h) (6VD1) or

21 mph (34 km/h) (6VE1) or more for 1 second or
more

b. When transmission oil temperature reaches

130

C (266

F) or above

NOTE: The mode returns to normal drive mode or power
drive mode after the winter drive mode is canceled.

Backup Mode

If a major system failure occurs which could affect safety
or damage the transmission under normal vehicle
operation, the diagnostic system detects the fault and
overrides the Powertrain Control Module (PCM).
The “CHECK TRANS” light flashes to alert the driver, and
the transmission must be manually shifted as follows:

Select lever position

Gear Ratio Selected

4 (Fourth)

Manual 3

4 (Fourth)

Manual 2

3 (Third)

Manual L

1 (First)

Reverse

Shifts are firmer to prevent clutch slip and consequent
wear. The fault should be corrected as soon as possible.

7A1–10 TRANSMISSION CONTROL SYSTEM (4L30–E)

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.

N
P
U

Kickdown SW

(fixed to accelerator pedal)

Senses whether the driver has pushed the accelerator pedal fully or not, and
feeds the information to PCM.

U
T

Mode SW (fixed to T/M)

Senses the select lever position, and feeds the information to PCM.

Power drive SW

(fixed to front console)

Senses whether the driver has selected the power mode, and feeds the
information to PCM.

G T/M oil temp. sensor

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

N
A
L

Engine coolant tempera-
ture 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 informa-
tion to PCM.

Cruise controller * (Over-
drive OFF signal)

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

Shift solenoid A, B

Selects shift point and gear position suited to the vehicle running condition on
the basis of PCM output.

S
O
L

Band apply solenoid

Controls oil flow suited to the vehicle running condition on the basis of PCM
output.

O
U
T
P

E
N
O

Torque Converter
Clutch solenoid

Controls clutch engagement/disengagement suited to the vehicle running
condition on the basis of PCM output.

P
U
T

Force motor

(Pressure regulator
valve)

Adjusts the oil pump delivery pressure to line pressure suited to the vehicle
running condition on the basis of PCM output.

Power drive mode lamp

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

Winter drive mode lamp

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

G
N
A
L

T/M monitor lamp

(“CHECK TRANS”)

Informs the driver of failure in the system.

ATF warning lamp

Lights when ATF oil temperature rises.

ABS signal *

When the select lever is at “Reverse” or “L” range, sends a signal to the ABS
controller as one of the ABS control conditions.

* If equipped

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–11

Diagnosis

Electronic Diagnosis

How To Diagnose The Problem

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

followed accurately. Unless stated, do not jump
directly to a section that could contain the solution.
Some important information may be missed.

2. The sections in CAPITALS and bold are the main

sections that can be found in the contents.

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

going to the “section”.

4. The GOTHROUGH “SECTION” means to go

through the “section” and then to go back to the place
the GOTHROUGH was written.

5. BASIC ELECTRIC CIRCUITS:

You should understand the basic theory of electricity.
This includes the meaning of voltage, amps, ohms,
and what happens in a circuit with an open or shorted
wire. You should also be able to read and understand
wiring diagrams.

Check Trans Indicator

Find CHECK TRANS indicator and verify if it is
A. Flashing: GOTO DIAGNOSTIC CHECK.
B. Staying on: GOTHROUGH CHECK TRANS

CHECK.

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

GOTHROUGH CHECK TRANS CHECK

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

Normal operation. No DTC or malfunction.

821RW261

Diagnostic Check

This test determines if the transmission or its inputs,
outputs, connections, or sensors are failing.

1. Connect the Tech2: GOTHROUGH Tech2 OBD II

CONNECTION.

2. Turn on the ignition but not the engine.

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

Code (DTC):

4. Do you have a DTC?

YES: write down all code numbers and do the DTC
CHECK
NO: the DTC can not help you finding the problem.

1. GOTHROUGH “CHECK TRANS” CHECK

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

and 0.2 seconds OFF, this means that you should
have a DTC stored. Please recheck GOTO
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).

Normal

C07RW047

Abnormal

C07RW048

7A1–12 TRANSMISSION CONTROL SYSTEM (4L30–E)

“Check Trans” Check

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

the engine is cranked) but it is OFF after the engine
starts. The indicator is working normally GOTO
DIAGNOSTIC CHECK.

821RW261

Normal

C07RW047

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

and 0.2 seconds OFF always when ignition is on
(engine cranked or not). This means that there is a
malfunction. GOTO DIAGNOSTIC CHECK.

Abnormal

C07RW048

3. Indicator it is staying ON always when Ignition is ON.

1. This means that connection between the lamp

and the PCM is shorted to ground.

2. Verify if instrument panel terminal 3 of connector

I–9 is shorted to ground.

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

A14 is shorted to ground.

4. Verify that the instrument panel terminal 15 of

connector I–9 is connected to battery.

5. IF problem solved: GOTO CHECK TRANS

INDICATOR.

NO:Replace Powertrain Control Module (PCM).

4. Indicator it is staying OFF with the ignition ON (engine

OFF).
1. This means that connection between the lamp

and the PCM is shorted to battery or opened.

2. Verify if instrument panel terminal 3 of connector

I–9 is shorted to battery or open.

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

A14 is shorted to battery or open.

4. Verify that the instrument panel terminal 15 of

connector I–9 is connected to battery. If not,
check the fuses and the connections voltage.

5. IF problem solved: GOTO CHECK TRANS

INDICATOR.

NO: Replace Powertrain Control Module (PCM).

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