Speed Sensors
WARNING: This page is about a different car, the 2003 Jaguar XJR, 2002 Jaguar XJR, and 2001 Jaguar XJR. However, it is still accessible from the selected car via links, so may be relevant.
There are two speed sensors within the transmission assembly which provide input to the TCM. These inputs, when used in conjunction with CAN data relative to engine speed (from ECM) and road speed (from ABS), are used to electronically control the transmission.