4R100

4R100 TRANSMISSION

Turbine Shaft Speed (TSS) Sensor

The turbine shaft speed (TSS) sensor is a magnetic pickup that sends the powertrain control module (PCM) information on the rotation speed of the coast clutch cylinder assembly. The turbine shaft speed (TSS) sensor is mounted externally on the top of the transmission case. The PCM uses turbine shaft speed TSS sensor signal to help determine electronic pressure control (EPC) pressure, shift scheduling the torque converter clutch (TCC) operation.

For diesel applications, the PCM sends the TCC solenoid pulse-width modulated signals to smoothly engage the torque converter clutch.

Output Shaft Speed (OSS) Sensor-Gasoline Engines

The output shaft speed (OSS) sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the powertrain control module.

The OSS sensor is mounted externally on the top of the transmission extension housing. The powertrain control module (PCM) uses the OSS sensor signal to help determine electronic pressure control (EPC) pressure, shift scheduling and torque converter clutch (TCC) operation.