Vehicle Speed From The Anti-Lock Brake System (ABS) Module
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The ABS module calculates wheel speed from the front two wheel speed sensors and sends this information to the PCM through the communication network.