1A
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