Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 425

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

Functions of Input / Output Components

Components

Function

Speed sensor

(fixed to transmission)

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.

I

N

Brake switch

(fixed to brake pedal)

Senses whether the driver has pressed the brake pedal or not and feeds the
information to PCM.

N

P

U

Mode switch (fixed to
transmission)

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

U

T

 

S

Power drive switch

(fixed to front console)

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

S

I

T/M oil temperature sensor

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

I

G

N

A

Engine coolant
temperature sensor

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

A

L

Engine speed signal

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

L

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
controller integrated in PCM.

O

U

T

S

Shift solenoid A, B

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

P

U

T

S

O

L

E

Band apply solenoid

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

 

S

I

G

E

N

O

I

Torque Converter
Clutch PWM solenoid

Controls clutch apply suited to the vehicle running condition on the basis of PCM
output.

G

N

A

L

I

D

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.

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 GO TO “SECTION” means to continue to check

going to the “section”.

4. The GO THROUGH “SECTION” means to go

through the “section” and then to go back to the place
the GO THROUGH 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: GO TO DIAGNOSTIC CHECK.
B. Staying on: GO THROUGH CHECK TRANS

CHECK.

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

THROUGH CHECK TRANS CHECK

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

Normal operation. No DTC or malfunction.

821R200014

Diagnostic Check

This test determines if the transmission or its input or
output connections or sensors are failing.

1. Connect the Tech 2: GO THROUGH 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 finding the problem.

1. GO THROUGH “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 GO TO
DIAGNOSTIC CHECK and if you find the same
problem, replace the Powertrain Control Module
(PCM).

Normal

C07R200005

Abnormal

C07R200006

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

“Check Trans” Check

1. Indicator is ON during 2

∼

3 seconds at ignition (or

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

821R200014

Normal

C07R200005

2. Indicator 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. GO TO DIAGNOSTIC CHECK.

Abnormal

C07R200006

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

1. This means that connection between the lamp

and the indicator control unit is shorted to ground.

2. Verify if instrument panel terminal 27 of connector

I–24 is shorted to ground.

3. Verify if the indicator control unit connector B–16

terminal 20 is shorted to ground.

4. Verify that the instrument panel terminal 14 of

connector I–24 is connected to battery.

5. If problem solved: GO TO 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 indicator control unit is shorted to battery
or opened.

2. Verify if instrument panel terminal 27 of connector

I–24 is shorted to battery or open.

3. Verify if the indicator control unit connector B–16

terminal 20 is shorted to battery or open.

4. Verify that the instrument panel terminal 14 of

connector I–24 is connected to battery. If not,
check the fuses and the connections (terminal 7
of connector H–17) voltage.

TRANSMISSION CONTROL SYSTEM (4L30–E)

7A1–13

5. If problem solved: GO TO CHECK TRANS

INDICATOR.

NO: Replace Powertrain Control Module (PCM).

D07R200003

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 adaptor (3000098) (1), RS 232 loop

back connector (3000112) (2), and PCMCIA card
(3000117) (3).

F07RW033