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Test J: Speedometer Fluctuates

  1. Verify Connector Seating

    Check instrument cluster connectors for good clean connection. Repair as necessary. If connections are okay, go to next step.

  2. Check For DTCs

    Using New Generation Star (NGS) scan tester, check PCM for any continuous DTCs. If no DTCs are retrieved, go to next step. If any DTCs are retrieved from PCM, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.

  3. Check Gray/Black Wire For Open

    Turn ignition off. Disconnect NGS scan tester. Disconnect instrument cluster harness connector C237 and VSS harness connector. Measure resistance of Gray/Black wire between C237 pin No. 7 and VSS harness connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Gray/Black wire. Check speedometer operation.

  4. Check VSS

    Turn ignition off. Disconnect NGS tester. Disconnect VSS harness connector. Measure resistance between VSS terminals. If resistance is 200-300 ohms, go to next step. If resistance is not 200-300 ohms, replace VSS. Check speedometer operation.

  5. Check Pink/Orange Wire For Open

    Measure resistance of Pink/Orange wire between VSS harness connector and ground. If resistance is less than 5 ohms, check VSS drive gears. Repair as necessary. If resistance is greater than 5 ohms, repair open Pink/Orange wire. Check speedometer operation.
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