Information Bus: Description and Operation

System Diagram:

SYSTEM DIAGRAM

HINT: The skid control ECU stores DTCs and performs DTC communication by receiving information from the steering sensor and yaw rate sensor.

These sensors cannot store DTCs or perform DTC communication.

SYSTEM DESCRIPTION

1. BRIEF DESCRIPTION
a. The Controller Area Network (CAN) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps) and the ability to detect malfunctions.
b. The CAN performs the communication based on the differential voltage by pairing the CANH bus line and CANL bus line.
c. This vehicle uses the CAN communication system for communication between the skid control ECU, steering sensor and yaw rate sensor.
d. The CAN has 2 resistors of 120 Ohms that are necessary for communication to the main bus line.

2. DEFINITION OF TERMS
a. The main bus line is a wire harness between the two terminus circuits on the bus (communication line). This is the main bus in the CAN communication system.
b. The sub bus line is a wire harness which diverges from the main bus line to an ECU or sensor.

3. ECU OR SENSORS WHICH COMMUNICATE THROUGH THE CAN COMMUNICATION SYSTEM
a. Skid Control ECU
b. Steering Sensor
c. Yaw Rate Sensor

4. DIAGNOSTIC CODES FOR THE CAN COMMUNICATION SYSTEM
a. DTCs for the CAN communication system are as follows:
U0121/94 (C1223/43), U0123/62, U0124/95 (C1223/43), U0126/63

5. REMARKS FOR TROUBLESHOOTING
a. Trouble in the CAN bus (communication line) can be checked from the DLC3 (except a wire break other than in the DLC3 sub bus line).
b. By using the hand-held tester, DTCs for the CAN communication system can be checked through the DTC ISO 9141K-Line.