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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 45 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - 3.1L ENGINE)DIAGNOSTIC TESTSDTC P0650: MIL CONTROL CIRCUIT (MALIBU)DIAGNOSTIC PROCEDURES
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Diagnostic Procedures

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Malibu, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  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. Observe the MIL on the IPC. Is MIL illuminated? If yes, go to next step. If no, go to step  5.
  3. Command MIL OFF with scan tool. Is the MIL illuminated? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Test control circuit of the MIL for a short to ground or short to voltage. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  16. If no, go to step  13.
  5. Turn ignition off. Disconnect PCM harness connector. Connect a 3-amp fused jumper wire between the MIL control circuit and ground. Turn ignition on, with engine off. Is MIL illuminated? If yes, go to next step. If no, go to step  7.
  6. Did the fuse in the jumper wire open? If yes, go to next step. If no, go to step  8.
  7. Test the MIL control circuit for a short to voltage. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  16. If no, go to step  13.
  8. Turn ignition off. Reconnect PCM harness connector. Disconnect IPC connector. Turn ignition on, with engine off. Probe the ignition 0 voltage circuit and battery positive voltage circuits of IPC harness connector with a test light connected to a good ground. See WIRING DIAGRAMS article. Does test light illuminate for both circuits? If yes, go to step  10. If no, go to next step.
  9. Repair open or short to ground in the IPC ignition 0 voltage circuit and battery positive voltage circuit. After repairs, go to step  16.
  10. Connect test light between the ignition 0 voltage circuit and MIL control circuit of IPC harness connector. Command the MIL ON and OFF with scan tool. Does test light turn ON and OFF? If yes, go to next step. If no, go to step  12.
  11. Inspect for poor connections at the IPC harness connector. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  12. Test for open MIL control circuit. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  13. Inspect for poor connections at PCM. If a condition is found, repair as necessary. Did you find and correct the condition? If yes, go to step  16. If no, go to next step.
  14. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  15. Replace IPC. When complete, go to next step.
  16. Use the scan tool in order to clear the DTCs. Turn ignition off for 30 seconds. Start 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.
  17. 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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.