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Home >> Chevrolet >> 2001 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> 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 powertrain diagnostic system check, go to next step.
    2. NOTE: If MIL fuse is open, locate and repair a short to ground in MIL battery voltage circuit or a shorted cluster.
  2. Check MIL fuse and replace as necessary. If fuse was open, go to step  12. If fuse was not open, go to next step.
    3. NOTE: If jumper fuse opens, locate and repair short to voltage in MIL control circuit or a shorted cluster.
  3. Turn ignition off. Disconnect PCM. Connect a fused jumper wire (3-amp) between PCM connector C2 terminal No. 5 (Brown/White wire) and ground. See Figure. Turn ignition on, engine off. If MIL is illuminated, go to next step. If MIL is not illuminated, go to step  5.
  4. Leaving ignition on, remove jumper. If MIL is illuminated, go to step  7. If MIL is not illuminated, go to step  9.
  5. Remove instrument cluster. Check Brown/White wire between instrument cluster and PCM for open. If problem was found, repair as necessary. After repairs, go to step  12. If problem was not found, go to next step.
  6. Check MIL battery voltage circuit between instrument cluster and fuse for an open. If problem was found, repair as necessary. After repairs, go to step  12. If problem was not found, go to step  8.
  7. Remove instrument cluster. Check Brown/White wire between instrument cluster and PCM for short to ground. If problem was found, repair as necessary. After repairs, go to step  12. If problem was not found, go to step  10.
  8. Check instrument cluster connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  12. If problem was not found, go to step  10.
  9. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  12. If problem was not found, go to step  11.
  10. Repair or replace instrument cluster. After repairs, go to step  12.
  11. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  12. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  13. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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