Vehicle Speed Sensor (VSS)

VSS consists of a reed switch and magnet mounted on transmission (in speedometer head on Swift M/T). As magnet rotates within VSS, magnet causes reed switch to turn on and off. Switching action increases or decreases in proportion with vehicle speed. PCM supplies and monitors a voltage signal to VSS. PCM uses this signal to help determine control of idle speed control system and up-shift indicator light on Swift.