F 450 4WD Super Duty V10-6.8L VIN D (2004)
Transmission Speed Sensor: Description and Operation
4R100
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 drum. The turbine shaft speed (TSS) sensor is mounted externally on the top of the transmission case. The PCM uses the TSS sensor signals to
help determine electronic pressure control (EPC) pressure, shift scheduling the torque converter clutch (TCC) operation.
Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup that provides transmission output shaft rotation speed information to the powertrain control
module (PCM).
The output shaft speed (OSS) sensor is mounted externally on the top of the transmission extension housing. The PCM uses the OSS sensor signal to
help determine electronic pressure control (EPC) pressure, shift scheduling and torque converter clutch (TCC) operation.
