Vehicle Speed Sensor: Description and Operation

Vehicle Speed Sensor (VSS)




The ECM determines the speed of the vehicle by converting a pulsing voltage signal from the vehicle speed sensor (VSS) into miles per hour. The ECM uses this signal to operate the cruise control, speedometer, and the TCC and shift solenoids in the transmission. For more information on the TCC and shift solenoids, refer to AW30-40LS Automatic Transmission section.