Vehicle Speed Sensor: Description and Operation

Vehicle Speed Sensor (VSS):

PURPOSE:
The Vehicle Speed Sensor (VSS) provides information to the ECM for control of transmission Torque Converter Clutch (TCC), speedometer, odometer and cruise control.

OPERATION:
The VSS is a Permanent Magnet (PM) generator that produces a pulsing A/C voltage whenever vehicle speed exceeds about 3 mph (5 Kph). The A/C voltage level and the number of pulses increases with vehicle speed and is converted by the ECM to MPH (Kph). A VSS buffer is incorporated into the ECM for operating the instrument panel speedometer and odometer.

LOCATION:
Transaxle