Output Shaft Speed (OSS) Sensor
WARNING: This page is about a different car, the 2003 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
The OSS sensor is located in the transmission housing above the rotor in the differential.
The OSS sensor is an inductive sensor which detects the vehicle speed by means of a rotor on the differential.
The signal is used for the following functions among other things:
- to determine the shift timing,
- to supply the vehicle speed input signal for the PCM.
If the OSS sensor fails, the signal of the TSS sensor is used as a substitute signal.