E 450 V8-6.0L DSL Turbo VIN P (2004)
Transmission Speed Sensor: Description and Operation
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.
