Transmission Speed Sensor: Description and Operation

TRANSMISSION COMPONENTS


Input And Output Speed Sensors (TISS) And (TOSS)

The two speed sensors are of the magnetic induction type, and are mounted on the left hand side of the transmission, the input sensor forward of the transmission centre, and the output sensor close to the rear extension housing. The induced voltage in the input sensor is generated from machined serrations on the forward clutch housing, and in the output speed sensor by serrations on the rear carrier assembly. The information from these two sensors is used by the transmission control module (TCM) to determine whether the engine is running, vehicle speed, the gear ratio, the TCC slip, and the turbine speed.