Circuit Description

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The output shaft speed (OSS) sensor assembly provides vehicle speed information to the transmission control module (TCM). The OSS sensor assembly is a hall-effect sensor. The sensor is mounted in the transmission case facing the parking lock gear which is splined to the output shaft assembly. As the output shaft and parking lock gear rotate, the toothed parking lock gear produces a square wave voltage signal as the teeth pass through the magnetic field of the sensor. The number of pulses increases as the speed of the vehicle increases. The TCM converts the voltage to vehicle speed. The TCM uses the output shaft speed signal to determine shift timing and torque converter clutch (TCC) scheduling.

If the TCM detects no vehicle speed when there is engine speed in a drive gear range, then DTC P0722 sets. DTC P0722 is a type A DTC.