1997 Isuzu Trooper LSFACTORY OEM SERVICE PROCEDURE

Mil On Steady

  1. Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  . After performing OBD system check, go to next step.
  2. 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).
  3. Turn ignition off. Disconnect instrument panel cluster connector. Check for short to ground in MIL control circuit (Purple 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.
  4. Replace instrument panel cluster. See appropriate INSTRUMENT PANEL article in the instrument panel section. Repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
  5. 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  .
  6. Replace PCM. Repeat ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  .
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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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