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Test F: Speedometer &/Or Odometer Inaccurate Or Inoperative

  1. If instrument panel cluster diagnostic system check has been performed, go to next step. If instrument panel cluster diagnostic system check has not been performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel. Raise vehicle drive wheels and support vehicle. Start engine. Place transmission into Drive position. Using scan tool, observe VEHICLE SPEED parameter in IPC data list. If VEHICLE SPEED parameter matches speedometer display, go to next step. If VEHICLE SPEED parameter does not match speedometer display, go to step  4 .
  3. If odometer operates normally, concern maybe intermittent. See PROBLEM DIAGNOSIS  under INTERMITTENTS. If odometer does not operate normally, go to step  8 .
  4. Turn ignition switch to OFF position. Disconnect Electronic Brake Control Module (EBCM) harness connector. ECBM is located at left front corner of engine compartment, attached to lower frame rail. Turn ignition switch to RUN position. Using DVOM measure voltage between ground and EBCM harness connector C1 terminal No. 23. See WIRING DIAGRAMS  . If voltage reading is less than 9 volts, go to next step. If voltage reading is 9 volts or more, go to step  6 .
  5. Check for open or short to ground in Blue/Red wire between EBTCM harness connector C1 terminal No. 23 and IPC harness connector C1 terminal No. 23. See WIRING DIAGRAMS  . If problem is found, repair as necessary and go to step  11 . If no problem is found, go to step  7 .
  6. Check for short to voltage in vehicle speed signal circuit (Blue/Red wire) between EBTCM harness connector C1 terminal No. 23 and IPC harness connector C1 terminal No. 23. See WIRING DIAGRAMS  . If problem is found, repair as necessary and go to step  11 . If no problem is found, go to step  8 .
  7. Check for poor, loose or corroded terminals in IPC harness connectors. If problem is found, repair as necessary and go to step  11 . If no problem is found, go to step  9 .
  8. Check for poor, loose or corroded terminals in EBTCM harness connectors. If problem is found, repair as necessary and go to step  11 . If no problem is found, go to step  10 .
  9. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs are made, go to step  11 .
  10. Replace EBCM. See appropriate ANTI-LOCK article in BRAKES. After repairs are made, go to next step.
  11. Reconnect all harness connectors and reinstall all components. Check speedometer operation. If speedometer operates properly, system is okay. If speedometer does not operate properly, go to step  2 .
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