F 250 2WD Super Duty V8-5.4L VIN 5 (2006)
Transmission Speed Sensor: Description and Operation
Transmission Output Shaft Speed (OSS) Sensor
The transmission output shaft speed (OSS) sensor is located on the extension housing. The OSS is a Hall-effect type sensor. The OSS reads the gear
teeth on the park gear, different than the teeth used for park function. The OSS input to the PCM is used for shift scheduling, timing and torque converter
clutch (TCC) operation vehicle speed. The OSS has bi-directional capability and has a digital output.
Turbine Shaft Speed (TSS) Sensor and Intermediate Shaft Speed Sensor
The turbine shaft speed (TSS) and intermediate shaft speed sensors are a hall-effect sensor requiring a 12-volt power and a ground. The other 2 terminals
at the sensor are for TSS/intermediate shaft speed sensors output. The sensor detects a teeth on the coast clutch input hub TSS and the adjacent overdrive
ring gear intermediate shaft speed sensors. Both read 30 teeth per revolution. The TSS and intermediate shaft speed sensors are mounted externally on
the transmission case toward the top of the driver's side. The TSS and intermediate shaft speed sensors input to the PCM is digital and used to determine
line pressure, shift scheduling, timing and TCC operation.
