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Speedometer Inaccurate Or Inoperative

NOTE: After each repair procedure has been completed, reconnect all components. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK  under SYSTEM TESTS.
  1. Perform INSTRUMENT PANEL CLUSTER (IPC) SYSTEM CHECK  under SYSTEM TESTS. If entire IPC is inoperative, go to INSTRUMENT PANEL CLUSTER (IPC) INOPERATIVE  . If just speedometer is inaccurate or inoperative, go to next step.
  2. Turn ignition off. Raise and support vehicle. Start engine. Place shift lever in Drive position (automatic) or third gear (manual) and allow drive wheels to spin. If speedometer indicates a vehicle speed, check for intermittent in wiring or connections. See WIRING DIAGRAMS  . If speedometer does not indicate a vehicle speed, go to next step.
  3. Turn ignition off. Disconnect 16-pin engine harness-to-body harness connector C101. IPC connector. See COMPONENT LOCATIONS  . Turn ignition on. Using DVOM connected to ground, measure voltage at female side of 16-pin connector C101 terminal "N" (Dark Green wire). If more than 9.5 volts exists, go to step  7 . If 9.5 volts or less exists, go to next step.
  4. Turn ignition off. Disconnect IPC connector. Remove instrument cluster as necessary for access to IPC connector. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Remove IPC connector comb. Using DVOM, check continuity of VSS circuit between 16-pin connector C101 terminal "N" and IPC connector terminal A4. See WIRING DIAGRAMS  . If continuity exists, go to next step. If continuity does not exist, go to step  9 .
  5. Connect DVOM between ground and IPC connector terminal A4. If continuity to ground exists on VSS input circuit, go to step  10 . If continuity to ground does not exist on VSS input circuit, go to next step.
  6. Check for poor connection at IPC connector. Repair as necessary and retest operation. If IPC connection is okay, go to step  15 .
  7. Turn ignition off. Disconnect Vehicle Control Module/Powertrain Control Module (VCM/PCM) Black connector. See COMPONENT LOCATIONS  . Using DVOM, check continuity of Vehicle Speed Sensor (VSS) input circuit between 16-pin connector C101 terminal "N" and VCM/PCM Black connector terminal No. 16 (2.2L) or terminal No. 3 (4.3L). If continuity exists, go to next step. If continuity does not exist, go to step  11 .
  8. Connect DVOM between ground and VCM/PCM Black connector terminal No. 16 (2.2L) or terminal No. 3 (4.3L). If continuity exists, go to step  12 . If continuity does not exist, go to step  13 .
  9. Repair open in VSS circuit between 16-pin connector C101 terminal "N" and IPC connector terminal A4. Retest operation.
  10. Check for short to ground in VSS circuit wiring between 16-pin connector C101 terminal "N" and IPC connector terminal A4. Repair as necessary and retest operation. If short to ground is not found in VSS wiring, check for a fault in VSS related components. Disconnect each VSS related component one at a time and recheck circuit for short to ground. Repair as necessary and retest operation.
  11. Repair open in VSS circuit between 16-pin connector C101 terminal "N" and VCM/PCM Black connector terminal No. 16 (2.2L) or terminal No. 3 (4.3L). Retest operation.
  12. Repair short to ground in VSS circuit between 16-pin connector C101 terminal "N" and VCM/PCM Black connector terminal No. 16 (2.2L) or terminal No. 3 (4.3L). Retest operation.
  13. Check for poor connection at VCM/PCM Black connector terminal No. 16 (2.2L) or terminal No. 3 (4.3L). Repair as necessary and retest operation. If VCM/PCM connection is okay, go to next step.
  14. Replace and reprogram VCM/PCM. See COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS article in ENGINE PERFORMANCE.
  15. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Retest operation.
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