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DTC P0501: Vehicle Speed Sensor #1 Performance (Manual Trans): Testing

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. Be sure to keep hands and feet clear of rotating wheels.
  1. Raise the drive wheels off the ground. Start the engine. With the DRBIII® scan tool, monitor the vehicle speed sensor. Place the transmission in any forward gear. Allow the wheels to rotate. Does the DRBIII® scan tool display vehicle speed above 0 MPH/KMH? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Disconnect the vehicle speed sensor harness connector. Turn the ignition on. Measure the voltage of the (K7) 5-volt supply circuit in the VSS harness connector. Is the voltage above 4.6 volts? If yes, go to next step. If no, repair the (K7) 5-volt supply circuit for an open.
  3. Turn the ignition off. Disconnect the vehicle speed sensor harness connector. Turn the ignition on. Measure the voltage of the (G7) VSS signal circuit in the VSS harness connector. Is the voltage between 4.5 to 5.0 volts? If yes, go to next step. If no, go to step  5.
  4. Turn the ignition off. Disconnect the vehicle speed sensor harness connector. Measure the resistance of the (K4) sensor ground circuit between the VSS harness connector and ground. Is the resistance below 5.0 ohms? If yes, remove and inspect the pinion gear. If OK, replace the vehicle speed sensor. If no, repair the (K4) sensor ground circuit for an open.
  5. Turn the ignition off. Disconnect the vehicle speed sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (G7) vehicle speed sensor signal circuit in the VSS harness connector to ground. Is the resistance below 100 ohms? If yes, repair the (G7) VSS signal circuit for a short to ground. If no, go to next step.
    6. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the vehicle speed sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (G7) VSS signal circuit between the VSS harness connector and to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5 ohms? If yes, go to next step. If no, repair the (G7) VSS signal circuit for an open.
  7. Before continuing disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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