Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Isuzu Rodeo 2WD L4-2.2LFACTORY OEM SERVICE PROCEDURE
Diagnostic Check
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 Tech2 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
Abnormal
"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.
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.
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 1-24 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 1-24 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 1-24 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 1-24 is connected to battery. If not, check the fuses and the connections (terminal 7 of connector H-17) voltage. If problem solved: GO TO CHECK TRANS INDICATOR.
NO: Replace Powertrain Control Module (PCM).
This test determines if the transmission or its input or output connections or sensors are failing.
1. Connect the Tech 2: GO THROUGH Tech2 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
Abnormal
"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.
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.
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 1-24 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 1-24 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 1-24 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 1-24 is connected to battery. If not, check the fuses and the connections (terminal 7 of connector H-17) voltage. If problem solved: GO TO CHECK TRANS INDICATOR.
NO: Replace Powertrain Control Module (PCM).
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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