CAN Communication System Description
ECM (1) and TCM (equipped with A/T) (2) of this vehicle communicate control data between each control module.
Communication of each control module is established by CAN (Controller Area Network) communication system.
CAN communication system uses the serial communication in which data is transmitted at a high speed. It uses a twisted pair of two communication lines for the high-speed data transmission. As one of its characteristics, multiple control modules can communicate simultaneously. In addition, it has a function to detect a communication error automatically. Each module reads necessary data from the received data and transmits data. ECM communicates control data with each control module as follows.
ECM Transmission Data to TCM
Engine torque driver requested
Engine speed
Top gear inhibit
Torque converter clutch control inhibit
Throttle position
Ignition timing advance for #1 cylinder
Vehicle speed
Engine coolant temperature
Brake pedal switch active
Air conditioning compressor clutch engaged
ECM Reception Data from TCM
Torque down ignition delay request
Transmission torque converter clutch mode
Transmission turbine angular velocity
Transmission emissions related malfunction active
Slope mode
Transmission gear selector position
Transmission actual gear
Transmission oil temperature
Drive signal