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 (7 off)
- Park lock solenoids (2 off)
- Hydraulic spool valves (21 off)
- 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 HS CAN powertrain systems bus from the PCM . Using a comparison of the two 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 fault code will be stored in the TCM .