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Test E: Speedometer And/Or Odometer Inaccurate Or Inoperative

  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Raise and support vehicle such that drive wheels are off ground. Start engine. On A/T models, place transmission selector lever into DRIVE position. On M/T models, shift transmission into 3rd gear. On all vehicles, observe VEHICLE SPEED parameter in PCM ENGINE DATA 1 list. If VEHICLE SPEED parameter matches speedometer indication, go to next step. If parameter and speedometer do not match, go to step  4 .
  3. If odometer is operating correctly, system is functioning normally at this time. Check wiring and connectors in system for possible intermittent fault. See WIRING DIAGRAMS  . If odometer is not operating properly, go to step  9 .
  4. Turn ignition switch to OFF position. Disconnect PCM connector C2. Turn ignition switch to ON position. Using DVOM, measure voltage between PCM connector C2 terminal No. 17 (2.2L engines) or No. 50 (4.3L engines) and ground. See Figure . See WIRING DIAGRAMS  . If measured voltage is greater than 9.0 volts, go to step  7 . If measured voltage is not greater than 9.0 volts, go to next step.
  5. Check Dark Green/White wire between PCM connector C2 terminal No. 17 (2.2L engines) or No. 50 (4.3L engines) and IPC connector terminal A4. See Figure . WIRING DIAGRAMS  . Check circuit for open or high resistance. Repair circuit as necessary, then go to step  11 . If no problems are found, go to next step.
  6. Check IPC connector for poor connections or corroded terminals. Repair connection as necessary, then go to step  11 . If no problem is found, go to step  9 .
  7. Check Dark Green/White wire between PCM connector C2 terminal No. 17 (2.2L engines) or No. 50 (4.3L engines) and IPC connector terminal A4. See Figure . See WIRING DIAGRAMS  . Check circuit for short to voltage. Repair circuit as necessary, then go to step  11 . If no problems are found, go to next step.
  8. Check PCM connector for poor connections or corroded terminals. Repair connector as necessary, then go to step  11 . If no problems are found, go to step  10 .
  9. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. When repair is complete, go to step  11 .
  10. Replace PCM. See REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE. When repair is complete, go to next step.
  11. Operate vehicle and verify proper speedometer operation. If speedometer and odometer operate normally, repair is complete. If Speedometer and odometer do not operate normally, go to step  2 .
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