F 450 4WD Super Duty V10-6.8L VIN D (2004)
Transmission Speed Sensor: Description and Operation
Torqshift
Transmission Output Shaft Speed (OSS) Sensor
The transmission output shaft speed (OSS) sensor is located on the extension housing. The OSS is 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 powertrain control module (PCM) is used for shift scheduling,
timing and 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 two
terminals at the sensor are for TSS/intermediate shaft speed sensors output. The sensor detects 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.
