MECHATRONIC Valve Block

The Mechatronic valve block is located in the bottom of the transmission and is covered by the fluid pan. The valve block houses the following components:

• TCM 
• Electrical actuators
• Speed sensors
• Control valves.

The above components provide all electro-hydraulic control for all transmission functions.

The Mechatronic valve block comprises the following components:

• TCM 
• Pressure regulator solenoids (quantity 7)
• Park lock solenoids (quantity 2)
• Hydraulic spool valves (quantity 21)
• Temperature sensor
• Turbine speed sensor
• Output shaft speed sensor.

Sensors 

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 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 TCM  to calculate the slip of the engine disconnect clutch and internal clutch slip. This signal allows the 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 TCM  . The output shaft speed is compared to engine speed signals received on the FlexRay the PCM  . Using a comparison of the 2 signals the 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 TCM  uses the temperature sensor signals to determine the temperature of the transmission fluid. These signals are used by the TCM  to control the transmission operation. This promotes 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 TCM  will use a default value and a Diagnostic Trouble Code(s) (DTC) will be stored in the TCM  .