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DTC P0501: Vehicle Speed Sensor #1 Performance: Testing

  1. Ensure that the pinion factor has been programmed and the correct tire size has been programmed in before continuing. Ignition on, engine not running. With the DRBIII® scan tool, read PCM DTCs and record the related freeze frame data. Is the Good Trip displayed and equal to zero? If yes, Repair DTCs as necessary. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition on. With the DRBIII® scan tool, check the transmission DTCs. Are there any transmission DTCs present? If yes, refer to the appropriate TRANSMISSION DTC in the TRANSMISSION article. If no, before continuing disconnect the PCM harness connector 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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