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Home >> Chevrolet >> 2000 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Circuit Tests >> Manual Transmission Shift Indicator Light Circuit (1.0L - With M/T) >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. After performing OBD system check, go to next step.
  2. Turn ignition on, engine off. If UPSHIFT indicator light is illuminated, go to next step. If UPSHIFT indicator light is not illuminated, go to step  6.
  3. Start engine. If UPSHIFT indicator light turns off, see DIAGNOSTIC AIDS . If UPSHIFT indicator light remains illuminated, go to next step.
  4. Check for a short to ground in UPSHIFT indicator light control circuit between instrument cluster and PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to next step.
  5. Check for a short to ground in instrument panel printed circuit board. Repair as necessary. After repairs, go to step  11. If circuit board is okay, go to step  10.
  6. Turn ignition off. Disconnect PCM connectors. Connect a fused jumper wire between PCM harness connector UPSHIFT indicator light control circuit and ground. See appropriate wiring diagram in WIRING DIAGRAMS article. Turn ignition on, engine off. If UPSHIFT indicator light is illuminated, go to step  10. If UPSHIFT indicator light is not illuminated, go to next step.
  7. Remove jumper wire. Using fused jumper wire, backprobe UPSHIFT indicator light control circuit at instrument panel cluster assembly connector C3 to ground. See appropriate wiring diagram in WIRING DIAGRAMS article. If UPSHIFT indicator light is illuminated, go to next step. If UPSHIFT indicator light is not illuminated, go to step  9.
  8. Check for an open in UPSHIFT indicator light control circuit between instrument cluster and PCM. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to step  10.
  9. Check for an open IGN fuse, faulty UPSHIFT indicator light bulb, an open in ignition feed circuit to instrument cluster, a poor connection at instrument cluster, or an open in instrument panel printed circuit board. Repair as necessary. After repairs, go to step  11. If no problem is found, see DIAGNOSTIC AIDS .
  10. Replace PCM. After repairs, go to next step.
  11. After repairs, operate vehicle within conditions under which original symptom was observed. If system operates properly, repair is complete. If system does not operate properly, see DIAGNOSTIC AIDS .
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