The Wheel Speed Sensor (WSS) generates a waveform with a frequency proportional to the speed of the vehicle. The signal generated by the WSS informs the ESC Module not only if the vehicle speed is low or high but also if the vehicle is or is not moving. Then, ESC Module informs PCM of these information.

The PCM uses these information to control the fuel injection, ignition timing, transaxle shift scheduling and torque converter clutch scheduling. The WSS signal is also used to detect rough road conditions.