Can Communication System System Description

Communication System. Lexus Gs430, Gs300. Uzs190 Grs190
Can Communication. Lexus Gs430, Gs300. Uzs190 Grs190

  1. BRIEF DESCRIPTION

  1. DEFINITION OF TERMS

  1. ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM

  1. DIAGNOSTIC CODE FOR CAN COMMUNICATION SYSTEM

  1. REMARK FOR TROUBLESHOOTING

  1. HOW TO DISTINGUISH THE CAN J/C CONNECTOR

Can Communication System -- System Description



BRIEF DESCRIPTION

  1. The CAN (Controller Area Network) 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.

  2. By pairing the CANH and CANL bus lines, the CAN performs communication based on differential voltage.

  3. Many ECUs (sensors) installed on the vehicle operate by sharing information and communicating with each other.

  4. The CAN has two resistors of 120 Ω which are necessary to communicate with the main bus line .


DEFINITION OF TERMS

  1. Main bus line

    1. 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.

  2. Sub bus line

    1. The sub bus line is a wire harness which diverges from the main bus line to an ECU or sensor.

  3. Terminus circuit

    1. The terminus circuit is a circuit which is placed to convert communication current of the CAN communication into bus voltage. It consists of a resister and condenser. Two terminus circuits are necessary on a bus.

  4. CAN J/C

    1. The CAN J/C is a junction designed for CAN communication, which stores a terminus circuit.


ECUS OR SENSORS WHICH COMMUNICATE THROUGH CAN COMMUNICATION SYSTEM

  1. Skid control ECU with actuator (3GR-FE, 3GR-FSE)

  2. Skid control ECU (3UZ-FE)

  3. Yaw rate sensor

  4. Steering sensor

  5. Television camera ECU

  6. Seat belt control ECU

  7. Distance control ECU

  8. Absorber control ECU

  9. ECM

  10. Gateway ECU

  11. Clearance warning ECU

  12. Power steering ECU

  13. Steering control ECU


DIAGNOSTIC CODE FOR CAN COMMUNICATION SYSTEM

  1. DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0122, U0123, U0124, U0126, U0132, U0145, U1101, U0130, U0131, U0145, U0114, U0146, U0105, U0121, U0104, U0235, U1102, 5C-42


REMARK FOR TROUBLESHOOTING

  1. Trouble in the CAN bus (communication line) can be checked from the DLC3 (except when there is a wire break other than in the sub bus line of the DLC3).

    NOTICE:
    Do not connect the tester directly to the DLC3 connector. Be sure to use a service wire.

  2. DTCs regarding the CAN communication system can be checked using the intelligent tester.

  3. The CAN communication system cannot detect trouble in the sub bus line of the DLC3 even though the DLC3 is also connected to the CAN communication system.


HOW TO DISTINGUISH THE CAN J/C CONNECTOR

  1. In the CAN communication system, the shape of all connectors connected to the CAN J/C is the same. The connectors connected to the CAN J/C can be distinguished by the colors of the bus line and the connecting side of the connector.

    HINT:
    See "TERMINALS OF ECU" (Click here) for bus line color or the type of connecting surface.