Circuit/System Description
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The input speed sensor (ISS) and output speed sensor (OSS) are hall-effect type sensors. The sensors receive supply voltage from the transmission control module (TCM) and produce a fixed amplitude square wave signal with a frequency proportionate to transmission gear rotations.