DTC P0501 Vehicle Speed Sensor A Range/Performance: General Description

The Vehicle Speed Sensor (VSS) or Wheel Speed Sensor (WSS) generates a waveform with a frequency proportional to the speed of the vehicle. The signal generated by the VSS or WSS informs the PCM not only if the vehicle speed is low or high but also if the vehicle is or is not moving. The PCM uses this signal to control the fuel injection, ignition timing, transaxle shift scheduling and torque converter clutch scheduling. The VSS or WSS signal is also used to detect rough road conditions.