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Home >> Pontiac >> 2001 >> Aztek Base, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0650: Malfunction Indicator Light Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, command MIL on and off. If MIL turns on and off with each command, problem is intermittent. If MIL does not turn on and off, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. If MIL is off, go to next step. If MIL is on, go to step  5.
  4. Using a fused jumper wire connected to ground, jumper PCM harness connector C2 terminal No. 5 (Brown/White wire). If MIL illuminates, go to step  6. If MIL does not illuminate, go to step  7.
  5. Repair short to ground in MIL control circuit (Brown/White wire). After repairs, go to step  9.
  6. Check for poor connections at PCM harness connector. Repair as necessary. After repairs, go to step  9. If connections are okay, go to step  8.
  7. Repair open in MIL ignition voltage circuit (Pink wire), or open or short to battery voltage in MIL control circuit (Brown/White wire). After repairs, go to step  9.
  8. Replace PCM. Program replacement PCM using required equipment. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  9. Turn ignition on, with engine off. Using scan tool, clear DTCs. Operate engine at idle and at normal operating temperature. Select DTC option and SPECIFIC DTC option, then enter this DTC. Operate vehicle within the conditions for setting this DTC. If DTC resets, go to step  2. If DTC does not reset, go to next step.
  10. Select CAPTURE INFO option and REVIEW INFO option on scan tool. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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