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Test I: Speedometer & Odometer Inoperative

  1. Verify Cruise Control Operation

    Drive vehicle and check cruise control operation. If cruise control operates properly, go to next step. If cruise control does not operate, see CRUISE CONTROL SYSTEM article. Repair as necessary.

  2. Check VSS PID

    Using New Generation Star (NGS) scan tester, access GEM. Select VSS PID. Monitor VSS PID while driving vehicle. If VSS PID seems to indicate actual vehicle speed, go to next step. If VSS PID does not indicate actual vehicle speed, go to step 4).

  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, repair/replace instrument cluster. 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, repair open Gray/Black wire. If resistance is more than 5 ohms, repair open Pink/Orange wire. Check speedometer operation.
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