E 350 V8-5.4L (2008)
Transmission Speed Sensor: Description and Operation
4R70E/4R75E
4R70E/4R75E TRANSMISSION
Output Shaft Speed (OSS) Sensor
The output shaft speed (OSS) sensor is a magnetic pickup, located at the output shaft ring gear, that sends a signal to the PCM to indicate transmission
output shaft speed. The OSS sensor is used for TCC control, shift scheduling and to determine EPC.
Turbine Shaft Speed (TSS) Sensor
The turbine shaft speed (TSS) sensor is a magnetic pickup that sends a signal to the PCM to indicate transmission turbine shaft speed. The TSS is
mounted externally on the case. The PCM uses the TSS signal to help determine appropriate operating pressure and TCC operation.
