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DTC P0500: No Vehicle Speed Sensor Signal: Testing

    NOTE: Any VSS DTCs in the Controller Anti-Lock Brake Module or Body Controller must be properly diagnosed before continuing. See appropriate ANTI-LOCK article in BRAKES or appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the Body Control Module C1 Gray harness connector. Measure the resistance of the (B22) Vehicle Speed Output circuit between the PCM harness connector and the BCM harness connector. Is the resistance above 5.0 ohms? If yes, repair the open (B22) Vehicle Speed Output circuit. If no, go to next step.
  3. Measure the resistance between ground and the (B22) Vehicle Speed Output circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the (B22) Vehicle Speed Output circuit for a short to ground. If no, go to next step.
  4. Turn the ignition off. Reconnect the Body Control Module connector. Turn ignition on, engine not running. Measure the voltage on the (B22) Vehicle Speed Output circuit at the PCM harness connector. Is the voltage above 4.8 volts? If yes, repair the (B22) Vehicle Speed Output circuit short to voltage. If no, go to next step.
    5. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  5. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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