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Home >> Chevrolet >> 1999 >> Metro Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Circuit Tests >> Manual Transmission Shift Light Circuit (1.0L With M/T) >> Diagnosis & Repair

Diagnosis & Repair

  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 with 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 goes out, go to 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 electrical 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 with 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 instrument panel cluster assembly connector C3 UPSHIFT indicator light control circuit 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, go to DIAGNOSTIC AIDS .
  10. Replace PCM. After repairs, go to next step.
  11. After repairs are completed, operate vehicle within conditions under which original symptom was observed. If system operates properly, repair is complete. If system does not operate properly, go to DIAGNOSTIC AIDS .
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