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Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. 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. With a scan tool observe the DTCs. Are any DTCs set? If yes, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If yes, go to next step.
  3. Turn ignition off. Observe the MIL on the Instrument Panel (IP) cluster. Is MIL ON? If yes, go to step  7. If no, go to next step.
  4. Install a scan tool. Command MIL ON and OFF several times while monitoring the IP cluster. Does the MIL turn ON and OFF when commanded? If yes, see DIAGNOSTIC AIDS . If no, go to step  6.
  5. Repair MIL control circuit for a short to ground. After repairs, go to step  7.
  6. Repair MIL control circuit for a short to voltage. After repairs, go to next step.
  7. Install a scan tool. Command MIL ON and OFF several times while monitoring the IP cluster. Does the MIL turn OFF when commanded? If yes, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. If no, go to step  2.
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