Circuit/System Description

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The transmission output speed sensor is a 2 wire hall effect sensor. The transmission output speed sensor signal pick up end faces the machined trigger slots on the outside diameter of the output carrier assembly. A 9 V reference circuit is supplied by the transmission control module (TCM) to the output speed sensor. As the output carrier assembly begins to rotate, the transmission output speed sensor produces a square wave signal. As the rotational speed of the output carrier assembly increases, the number or frequency of the square wave signal increases. The square wave is transmitted back to the TCM on the transmission output speed sensor signal circuit. The TCM uses the transmission output speed signal to calculate transmission output shaft speed. The input, intermediate and output speed sensor signals are used to determine line pressures, shift patterns, gear ratio and torque converter clutch (TCC) apply and release.