Vehicle Speed Sensor

Vehicle Speed Sensor (VSS) is mounted on left rear side of transmission. VSS produces an AC signal with a frequency proportional to speed at which transmission output shaft rotates, which is also proportional to vehicle speed. An AC signal is sent to cruise control module and speedometer by Powertrain Control Module (PCM). Signal is sent at a rate of 4000 pulses per mile, and PCM converts number of pulses per mile to pulses per second to determine speed of vehicle.