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DTC P0500: No Vehicle Speed Sensor Signal (A/T): Testing

  1. Turn the ignition on. With the DRBIII(R), read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  7 .
  2. Turn the ignition off. Disconnect the TCM harness connector. Turn the ignition on. Measure the voltage on the VSS signal circuit in the TCM harness connector. Is the voltage more than 6.0 volts? If yes, repair the VSS signal circuit for a short to voltage. If no, go to next step.
  3. Turn the ignition off. Connect a jumper wire to the VSS signal circuit in the TCM harness connector. Turn the ignition on. With the DRBIII(R), monitor the Vehicle Speed Signal display. Tap the other end of the jumper wire rapidly to ground. Does the Vehicle Speed Signal display the MPH/KMH more than zero? If yes, go to next step. If no, replace the TCM.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the VSS signal circuit in the PCM harness connector. Is the resistance less than 100 ohms? If yes, repair the VSS signal circuit for a short to ground. If no, go to next step.
  5. Measure the resistance of the VSS signal circuit between the PCM harness connector and the TCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the VSS signal circuit for an open.
  6. There are no possible causes remaining, replace PCM.
    7. WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
  7. Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
    • With the engine running at normal operating temperature, monitor the DRBIII(R) parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
    • Review the DRBIII(R) Freeze Frame information to identify under what conditions the DTC set.
    • Refer to any Technical Service Bulletin (TSB) that may apply.
    • Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
    • Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

      Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.

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