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Home >> Chevrolet >> 2002 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.4L >> Diagnostic Tests >> DTC P0650: Mil Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Turn ignition on, with engine off. Command the MIL ON and OFF using the scan tool. Does the MIL turn ON and OFF with each command? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
  3. Turn ignition off. Disconnect the PCM. Turn on the ignition. Is the MIL OFF? If yes, go to next step. If no, go to step  5.
  4. Probe the MIL control circuit in the PCM harness connector with a fused jumper wire connected to ground. Is the MIL ON? If yes, go to step  6. If no, go to step  7.
  5. Repair the short to ground in the MIL control circuit. After repairs, go to step  9.
  6. Test for poor connections at the PCM. Did you find and correct the condition? If yes, go to step  9. If no, go to step  8.
  7. Repair open ignition positive voltage to the MIL bulb or an open or shorted control circuit to battery positive voltage. After repairs, go to step  9.
  8. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  9. Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  10. Using scan tool, observe stored information and Capture Info. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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