Ford & GM 10R80/10L90 Speed Sensor Functions Archives - Transmission Digest
Ford & GM 10R80/10L90 Speed Sensor Functions

There are four internally mounted two-wire Hall-Effect speed sensors found in this shared Ford and GM 10-speed venture (Figure 1). Although all four-speed sensors work the same way, one of them is slightly different than the other three. A 9-volt supply from the TCM is sent to all four sensors and a signal from each sensor returns directly back to the TCM.