Transmission Output Shaft Speed (OSS) Sensor
WARNING: This page is about a different car, the 2004 Ford Pickup, 2004 Ford F550 Super Duty, 2004 Ford F450 Super Duty, 2004 Ford Excursion, and 2004 Ford Cab & Chassis. 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 bi-directional capability and has a digital output.