CAN Communication System Description: Notes
ECM (2), ABS / ESP® control module (1), TCM (3), BCM (4), 4WD control module (6), combination meter (7), keyless start control module (5), steering angle sensor (ESP® model) (8) and yaw rate/G sensor (ESP® model) (9) 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.