Transmission Output Shaft Speed (OSS) Sensor
WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
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 powertrain control module (PCM) is used for shift scheduling, timing and TCC operation vehicle speed. The OSS has bidirectional capability and has a digital output.