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DTC P0500: No Vehicle Speed Sensor Signal: Testing

  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 Vehicle Speed Sensor harness connector. Turn ignition on, engine not running. Measure the voltage on the (K6) 5-Volt Supply circuit at the Vehicle Speed Sensor harness connector. Is the voltage between 4.5 and 5.2 volts? If yes, go to next step. If no, go to step  8.
  3. Ignition on, engine not running. Connect a jumper wire between the (G7) Vehicle Speed Signal circuit and (K4) Sensor ground circuit in the VSS harness connector. With the DRBIII® read the Vehicle Speed Signal voltage. Does the voltage start at 5.0 volts and drop to approximately 0 volts? If yes, replace the Vehicle Speed Sensor. If no, go to next step.
    NOTE: Remove the jumper wire before continuing.
  4. Turn ignition off and disconnect the PCM harness connectors. With the ignition on and the engine not running, measure the voltage on the (G7) Vehicle Speed Sensor Signal circuit at the PCM or Sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the short to voltage in the Vehicle Speed Sensor Signal circuit. If no, go to next step.
  5. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the Vehicle Speed Sensor Signal circuit from the PCM harness connector to the Vehicle Speed Sensor harness connector. Is the resistance above 5.0 ohms? If yes, repair the open in the (G7) Vehicle Speed Sensor Signal circuit. If no, go to next step.
  6. Measure the resistance between ground and the Vehicle Speed Sensor Signal circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the Vehicle Speed Sensor Signal circuit for a short to ground. If no, go to next step.
  7. Measure the resistance of the (K4) Sensor ground circuit from the Sensor harness connector to the PCM harness connector. Is the resistance above 5.0 ohms? If yes, repair the open in the (K4) Sensor ground circuit. If no, go to step  10.
  8. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the (K6) 5-Volt Supply circuit from the Vehicle Speed Sensor harness connector to the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K6) 5-Volt Supply circuit.
  9. Measure the resistance between ground and the (K6) 5-Volt Supply circuit at the Vehicle Speed Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K6) 5-Volt Supply circuit. If no, go to next step.
    10. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage, or terminal push out. Repair as necessary.
  10. 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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