Automatic Transmission

Vehicle Speed Sensor (VSS) For A/T
The vehicle speed sensor consists of a magnetic core with magnet and coil. It is mounted on transmission case with O.6mm (0.024 in.) air gap between the core end and countershaft gear tooth.
While the countershaft rotates, magnetic flux is cut by gear tooth thus a pulse is generated in the sensor coil according to the speed. And then, the pulse is transmitted to powertrain (engine) control module as speed signal.