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DTC P0501: Vehicle Speed Sensor #1 Performance: Testing

NOTE: Any VSS DTCs in the CAB must be properly diagnosed before continuing. See appropriate ANTI-LOCK article in BRAKES.
  1. Turn the ignition on, with the engine off. With the DRBIII(R), read DTCs and record the related Freeze Frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS.
    2. 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.
  2. Turn the ignition off. Disconnect the CAB harness connector. Disconnect the PCM harness connectors. Measure the resistance of the VSS Signal circuit from the CAB harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the VSS Signal circuit.
  3. Turn the ignition on, with the engine off. Measure the voltage of the VSS Signal circuit in the CAB harness connector. Is the voltage more than 6.0 volts? If yes, repair the short to voltage in the VSS Signal circuit. If no, go to next step.
  4. Turn the ignition off. Disconnect the CAB harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the VSS Signal circuit in the CAB harness connector. Is the resistance less than 100 ohms? If yes, repair the short to ground in the VSS Signal circuit. If no, go to next step.
    5. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  5. There are no possible causes remaining, replace the PCM.
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