Vehicle Speed Sensor: Description and Operation

PURPOSE
The Vehicle speed Sensor (VSS) sends a pulsating voltage signal to the Electronic Control Module (ECM), which the ECM converts to MPH. This sensor mainly controls the operation of the Torque Converter Clutch (TCC) system.

OPERATION
The Vehicle Speed Sensor (VSS) is mounted in the transaxle and generates vehicle speed information to the ECM when vehicle speed is over 3 MPH. The VSS is a permanent magnet generator consisting of a field coil and permanent magnet stator that produces AC voltage. The information is then sent to the ECM. The function of the VSS buffer used in past model years has been incorporated into the ECM.