CAN COMMUNICATION SYSTEM SYSTEM DESCRIPTION


  1. 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 voltages.

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

    4. The CAN has 2 resistors of 120 Ω which are necessary to communicate using the CAN main wire.

  2. DEFINITION OF TERMS


    1. CAN main wire


      1. The CAN main wire is a wire harness between the 2 termination circuits on the bus (communication line). This is the CAN main bus in the CAN communication system.

    2. CAN branch wire


      1. The CAN branch wire is a wire harness which diverges from the CAN main wire to an ECU or sensor.

    3. Termination circuits


      1. The termination circuit is a circuit which converts the communication current of the CAN communication into the bus voltage. It consists of a resistor and capacitor. 2 termination circuits are necessary on a bus.

    4. CAN junction connector


      1. The CAN junction connector is designed so that it can be used with CAN communication which has a termination circuit and CAN communication which does not have a termination circuit.

  3. CIRCUIT DESCRIPTION


    1. The V1 bus and powertrain bus have termination circuits with a resistance of 120 Ω x 2. High speed communication at 500 kbps is possible.

  4. ECUS OR SENSORS WHICH COMMUNICATE VIA CAN COMMUNICATION SYSTEM


    1. ECM

    2. Air conditioning amplifier assembly*1

    3. Certification ECU (smart key ECU assembly)*2

    4. Headlight leveling ECU assembly*3

    5. Center airbag sensor assembly*4

    6. Brake actuator assembly (skid control ECU)*5

    7. Spiral cable sub-assembly (steering angle sensor)*6

    8. DLC3

    9. Combination meter assembly

    10. Transmission control ECU assembly*7


      • *1: w/ Air Conditioning System, except 5L-E

      • *2: w/ Smart Entry and Start System

      • *3: for LED Headlight

      • *4: w/ Airbag System

      • *5: w/ ABS

      • *6: w/ VSC

      • *7: for 1KD-FTV, 2KD-FTV and Automatic Transmission

  5. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM


    1. DTCs for the CAN communication system are as follows: U0100, U0101, U0124, U0126, U0129, U0151, U0155, U0182, U1000 and B1449.

  6. NOTES REGARDING TROUBLESHOOTING


    1. Trouble in the CAN bus (communication line) can be checked through the DLC3 (except when there is a wire break in the CAN branch wire of the DLC3).

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

    3. The CAN communication system cannot detect trouble in the CAN branch wire of the DLC3 even though the DLC3 is also connected to the CAN communication system.

  7. HOW TO DISTINGUISH CAN JUNCTION CONNECTOR CONNECTORS


    1. In the CAN communication system, the shape of all connectors connected to the CAN junction connector is the same.

      The connectors connected to the CAN junction connector can be distinguished by the colors of the bus line and the connecting side of the connector.

      Tech Tips

      See "Terminals of ECU" Click here for bus line color or the type of connecting surface.