Grand Marquis V8-4.6L Flex Fuel (2010)
Vehicle Speed Sensor: Description and Operation
Vehicle Speed Sensor (VSS)
ENGINE CONTROL COMPONENTS
Vehicle Speed Sensor (VSS)
The VSS is a variable reluctance or Hall-effect sensor that generates a waveform with a frequency that is proportional to the speed of the vehicle. If
the vehicle is moving at a relatively low speed, 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 control, transmission/transaxle shift scheduling, and TCC scheduling.
Typical VSS
