Information Bus: Description and Operation

SYSTEM OUTLINE
Multiplex communication system (CAN) uses a serial communication protocol and communicates with a differential voltage. In this network system, TERMINALS CANH and CANL are used for communication between the ECUs and sensors, and excellent data communication speed and communication error detecting facility are provided. This system is working for the following VSC system.

SYSTEM DESCRIPTION
The Controller Area Network (CAN) is a serial data communication system for real time application and also a multiplex communication system for a vehicle. In addition, the CAN has a high communication speed (500 kbps) and a function to detect a malfunction.

Pairing the CANH wire harness and CANL wire harness, the CAN performs communication based on the voltage difference.

The RAV4 uses the CAN communication system for communication between the following ECU and sensors in the ABS with EBD & BA & TRAC & VSC system.
- Skid control ECU
- Yaw rate sensor
- Steering angle sensor

The skid control ECU stores and outputs DTCs instead of the steering angle sensor and yaw rate sensor because they cannot store or output DTCs.




In the CAN communication system, 2 terminus circuits* which are necessary to communicate with the mainline are placed.

* These circuits consist of a resistor and condenser. They convert the communication current of the CAN communication into bus voltage.