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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 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 step  6.
  2. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the Controller Anti-Lock Brake (CAB) module harness connector. Measure the resistance of the Vehicle Speed Signal circuit between the PCM harness connector and the CAB harness connector. Is the resistance above 5.0 ohms? If yes, repair the open Vehicle Speed Signal circuit. If no, go to next step.
  3. Measure the resistance between ground and the Vehicle Speed Signal circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the Vehicle Speed Signal circuit for a short to ground. If no, go to next step.
  4. Ensure the ignition is off. Reconnect the CAB harness connector. Turn ignition on, engine not running. Measure the voltage on the Vehicle Speed Signal circuit at the PCM harness connector. Is the voltage above 4.8 volts? If yes, repair the Vehicle Speed Signal circuit short to voltage. If no, go to next step.
  5. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    6. 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.
  6. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® 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® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (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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