Isuzu Rodeo UE. Manual — part 473
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 to 3 seconds at ignition but OFF after:
Normal operation. No DTC or malfunction.
821RW105
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 “F2” 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 0.2 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
C07RW007
Abnormal
C07RW008
7A1–12 TRANSMISSION CONTROL SYSTEM (4L30–E)
“Check Trans” Check
1. Indicator is ON during 2 to 3 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.
821RW105
Normal
C07RW007
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. GOTO DIAGNOSTIC
Abnormal
C07RW008
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 (terminal 11
of connector H–27) voltage.
5. IF problem solved: GOTO CHECK TRANS
INDICATOR.
NO: Replace Powertrain Control Module (PCM).
TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–13
D07RW017
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 (7000057) hand–held scan tool unit 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
7A1–14 TRANSMISSION CONTROL SYSTEM (4L30–E)
2. Connecting the TECH–2
901RW180
Legend
(1) PCMCIA Card
(2) RS 232 Loop Back Connector
(3) SAE 16/19 Adaptor
(4) DLC Cable
(5) Tech–2
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