CAN COMMUNICATION SYSTEM


  1. OUTLINE


    1. The Controller Area Network (CAN) is a serial data communication network for real time application. It is a multiplex communication network equipped in a vehicle, and has communication speeds of 500 kbps (HS-CAN) and 250 kbps (MS-CAN), and the ability to detect malfunctions.

    2. The HS-CAN consists of the V bus, bus 2, bus 3 and bus 5.

    3. The MS-CAN consists of the sub bus 1.

    4. The main body ECU (multiplex network body ECU) has a gateway function and is used to transmit data between the bus 2 and sub bus 1.

    5. The communication wire used is a twisted-pair wire. The bus line has a high line (2.5 V to 3.5 V of voltage is applied) and a low line (1.5 V to 2.5 V of voltage is applied).

    6. The terminating resistors for each bus are located as shown in the following table.

      Speed Communication Bus Terminating Resistor Location Gateway Function Gateway Destination
      High-speed (HS-CAN) V Bus Central Gateway ECU (Network Gateway ECU) Central Gateway ECU (Network Gateway ECU)
      • Bus 2

      • Bus 3

      • Bus 5

      Bus 2
      • Combination Meter Assembly

      • ECM

      Central Gateway ECU (Network Gateway ECU)
      • V Bus

      • Bus 3

      • Bus 5

      Main Body ECU (Multiplex Network Body ECU) Sub Bus 1
      Bus 3 Central Gateway ECU (Network Gateway ECU) Central Gateway ECU (Network Gateway ECU)
      • V Bus

      • Bus 2

      • Bus 5

      Bus 5 Central Gateway ECU (Network Gateway ECU) Central Gateway ECU (Network Gateway ECU)
      • V Bus

      • Bus 2

      • Bus 3

      Middle-speed (MS-CAN) Sub Bus 1
      • Main Body ECU (Multiplex Network Body ECU)

      • No. 2 CAN Junction Terminal

      Main Body ECU (Multiplex Network Body ECU) Bus 2