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.
1996 Isuzu Trooper LS, AutomaticFACTORY OEM SERVICE PROCEDURE
Malfunction Indicator Light On Steady
- Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Turn ignition off. Disconnect PCM C-1 electrical connector. Turn ignition on. If MIL comes on, go to next step. If MIL does not come on, go to step 5).
- Turn ignition off. Disconnect instrument panel cluster connector. Check for short to ground in MIL control circuit (Violet wire) between PCM connector C-1 terminal A13 and instrument panel cluster. Repair as necessary. Repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. If circuit is okay, go to next step.
- Replace instrument panel cluster. Repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK.
- Turn ignition off. Reconnect PCM C-1 electrical connector. Turn ignition on. Reprogram EEPROM. Using scan tool, command MIL OFF. If MIL did not go off, go to next step. If MIL did go off, repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK.
- Replace PCM. Repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK.
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.