FixVault
Home › Chrysler › 2002 › Neon R/T › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0500: No Vehicle Speed Sensor Signal (M/T) › Testing

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

WARNING: Ensure hands and feet are kept clear of rotating wheels.
  1. Raise the drive wheels off the ground. Start the engine. Allow the engine to idle. With the DRBIII(R), monitor the Vehicle Speed Sensor display. Place the transmission in any forward gear. Allow the wheels to rotate. Does the DRBIII(R) display vehicle speed more than zero MPH/KMH? If yes, go to next step. If no, go to step  3 .
    2. 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.
  2. Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
    • Remove and inspect the pinion gear for the VSS. Ensure the gear is free from damage.
    • 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.
    • Attempt to duplicate the conditions under which the DTC was 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 related wiring harness connectors. Check 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.

  3. Turn the ignition off. Disconnect the VSS harness connector. Turn the ignition on. Measure the voltage on the 8-volt supply circuit in the VSS harness connector. Is the voltage more than 7.0 volts? If yes, go to next step. If no, repair 8-volt supply circuit for an open.
  4. Measure the voltage on the VSS signal circuit in the VSS harness connector. Is the voltage 4.5-5.0 volts? If yes, go to next step. If no, go to step  6 .
  5. Turn the ignition off. Measure the resistance of the sensor ground circuit between the VSS harness connector and ground. Is the resistance less than 5.0 ohms? If yes, remove and inspect the pinion gear. If the pinion gear is okay, replace the VSS. If no, repair the sensor ground circuit for an open.
  6. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the VSS signal circuit in the VSS 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.
  7. Measure the resistance of the VSS signal circuit between the PCM harness connector and the VSS 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.
  8. There are no possible causes remaining, replace PCM.
About FixVault