Windstar V6-232 3.8L (1995)
Vehicle Speed Sensor: Description and Operation
The vehicle speed sensor (VSS) is mounted on the transaxle and provides a speed signal to the Generic Electronic Module (GEM). At speeds above 24
kph (15 mph) the door signals (courtesy lamp switches) are ignored for venting operations.
Vehicle Speed Sensor (VSS)
The Vehicle Speed Sensor (VSS) is a variable reluctance sensor that generates a sine wave type waveform with a frequency that is proportional to the
speed of the vehicle. If the vehicle is moving at a relatively low velocity, the sensor produces a signal with a low frequency. As the vehicle velocity
increases, the sensor generates a signal with a higher frequency. The PCM uses the frequency signal generated by the VSS (and other inputs) to control
such parameters as fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling.
