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Speedometer And/Or Odometer Inoperative

  1. If instrument cluster diagnostic system check was performed, go to next step. If instrument cluster diagnostic system check was not performed, go to INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Connect scan tool to Data Link Connector (DLC). See Figure . Start engine and test drive vehicle. Using scan tool, select Powertrain Control Module (PCM) data display. Monitor VEHICLE SPEED status. If VEHICLE SPEED status matches speedometer reading, go to next step. If VEHICLE SPEED status does not match speedometer reading, go to step  4 .
  3. Check odometer operation. If odometer operates properly, system is okay at this time. If odometer does not operate properly, go to step  7 .
  4. Check for open, short to ground, short to voltage or high resistance in Dark Green/White wire between PCM connector C1 terminal No. 26 and IPC connector C2 terminal A6. See Figure and Figure . If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step  9 .
  5. Check for poor connections at Instrument Panel Cluster (IPC) connector. If connections are okay, go to step  7 . If faulty connections are found and repaired, go to step  9 .
  6. Check for poor connections at PCM connector. If connections are okay, go to step  8 . If faulty connections are found and repaired, go to step  9 .
  7. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to step  9 .
  8. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  9. After repairs, recheck operation of speedometer and odometer display. If speedometer and odometer display operates properly, repair is complete. If speedometer and odometer display does not operate properly, go to step  2 .
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