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Home >> Chevrolet >> 2000 >> Venture Value >> 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 On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Check MIL fuse. If fuse is open, locate and repair short to ground in MIL ignition supply circuit or a shorted instrument cluster. Repair as necessary and replace fuse. After repairs, go to step  12. If fuse is okay, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector. Connect a fused jumper wire between a known-good ground and MIL control circuit at PCM harness connector. Turn ignition on, with engine off. Check jumper wire fuse. If fuse blows, repair short to voltage in MIL control circuit or a shorted cluster. If fuse did not blow, check MIL operation. If MIL is illuminated, go to next step. If MIL is not illuminated, go to step  5.
  4. Leave ignition on. Remove jumper wire. Observe MIL operation. If MIL is illuminated, go to step  7. If MIL is not illuminated, go to step  9.
  5. Remove instrument cluster. Check for open in MIL control circuit. Repair as necessary. After repairs, go to step  12. If circuit is okay, go to next step.
  6. Check for open in MIL ignition supply circuit. Repair as necessary. After repairs, go to step  12. If circuit us okay, go to step  8.
  7. Remove instrument cluster. Check for short to ground in MIL control circuit. After repairs, go to step  12. If circuit is okay, go to step  10.
  8. Check cluster harness connector for faulty connections. Repair as necessary. After repairs, go to step  12. If connections are okay, go to step  10.
  9. Check PCM harness connector for faulty connections. Repair as necessary. After repairs, go to step  12. If connections are okay, go to step  11.
  10. Repair or replace instrument cluster. After repairs, go to step  12.
  11. Replace PCM. program replacement PCM using required equipment. After replacing PCM, go to next step.
  12. Using scan tool, review and record scan tool FAIL RECORDS data. Clear DTCs. Operate vehicle within conditions for setting this DTC. Recheck DTCs. If this DTC resets, go to step  2. If this DTC does not reset, system is okay.
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