MECHATRONIC Valve Block: Sensors

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.

Speed Sensors

The turbine speed sensor and the output shaft speed sensor are Hall effect type sensors located in the Mechatronic valve block and are not serviceable items. The transmission control module (TCM) monitors the signals from each sensor to determine the input (turbine) speed and the output shaft speed.

The turbine speed is monitored by the transmission control module (TCM) to calculate the slip of the torque converter clutch and internal clutch slip. This signal allows the transmission control module (TCM) to accurately control the slip timing during shifts and adjust clutch application or release pressure for overlap shift control.

The output shaft speed is monitored by the transmission control module (TCM) and compared to engine speed signals received on the controller area network (CAN) bus from the engine control module (ECM). Using a comparison of the two signals the transmission control module (TCM) calculates the transmission slip ratio for plausibility and maintains adaptive pressure control.

Temperature Sensor

The temperature sensor is also located in the Mechatronic valve block. The transmission control module (TCM) uses the temperature sensor signals to determine the temperature of the transmission fluid. These signals are used by the transmission control module (TCM) to control the transmission operation to promote faster warm-up in cold conditions or to assist with fluid cooling by controlling the transmission operation when high fluid temperatures are experienced. If the sensor fails, the transmission control module (TCM) will use a default value and a fault code will be stored in the transmission control module (TCM).