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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Disconnect PCM White 34-pin harness connector (with MIL control circuit). Turn ignition switch to RUN position, engine OFF. Is MIL illuminated? If yes, go to next step. If yes, go to step  4.
  3. Repair short to ground in MIL control circuit between PCM and IPC assembly. After repair, go to step  5.
  4. Replace PCM. After repair, go to next step.
  5. Start engine and observe the MIL. Does MIL turn OFF approximately 1 to 2 seconds after engine is started? If yes, go to next step. If no, go to step  2.
  6. Using scan tool, the stored information, CAPTURE INFO. Does scan tool display any DTCs that have not been diagnosed? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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