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Shift Light Circuit Diagnosis (Manual Transmission)

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK in appropriate SELF-DIAGNOSTICS article. After performing powertrain diagnostic system check, go to next step.
  2. Turn ignition off. Install scan tool. Turn ignition on. Using scan tool, command shift light on. If shift light illuminates, go to step  4. If shift light does not illuminate, go to next step.
  3. Turn ignition off. Disconnect PCM harness connector that contains shift light circuit. Turn ignition on. Connect a fused jumper wire between ground and shift light control circuit (Tan/Black wire) at PCM harness connector. If shift light illuminates, go to step  5. If shift light does not illuminate, go to step  6.
  4. Using scan tool, command shift light off, and then on. If shift light operates as commanded, system is okay. If shift light does not operate as commanded, go to step  8.
  5. Check shift light control circuit (Tan/Black wire) for poor connection at PCM. If problem exists, go to step  7. If problem does not exist, go to step  10.
  6. Repair open in shift light control circuit between PCM and instrument cluster. After repairs, go to step  11.
  7. Repair poor connection as necessary. After repairs, go to step  11.
  8. Turn ignition off. Disconnect PCM harness connector that contains shift light circuit. Turn ignition on. If shift light illuminates, go to next step. If shift light does not illuminate, go to step  10.
  9. Repair short to ground in shift light control circuit (Tan/Black wire) between PCM and instrument cluster. After repairs, go to step  11.
  10. Replace PCM and reprogram. Perform VTD password relearn procedure and perform crankshaft variation learn procedure. See COMPUTER RELEARN PROCEDURES in GENERAL INFORMATION article. After repairs, go to next step.
  11. Using scan tool, clear DTCs. Start engine and let idle until normal operating temperature is obtained. Using scan tool, select DTC, and then SPECIFIC DTC. Enter the DTC number which was set. Operate vehicle under conditions for setting DTC until scan tool indicates the diagnostic ran. If scan tool indicates the diagnostic passed, go to next step. If scan tool does not indicate the diagnostic passed, go to step  2
  12. If scan tool does not display any DTCs, system is okay. If scan tool displays any DTCs, perform appropriate DTC test. See appropriate SELF-DIAGNOSTICS article.
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