Vehicle Speed Sensor: Description and Operation
DESCRIPTIONThe VSS is an electronic relay that is mounted on the transaxle. As the transaxle turns the VSS, the VSS provides the speedometer with a vehicle speed input (voltage pulses). This input is used to drive the speedometer. The speedometer then converts this vehicle speed input into a more precise waveform and provides the ECM/PCM and the cruise control module (if equipped) with its own vehicle speed input. The ECM/PCM converts this input (ground pulses) into a vehicle speed.