GENERAL INFORMATION


*
note *: The regulations have been decided in detail, from software matters such as the necessary transmission rate for communication, the system, data format, and communication timing control method to hardware matters such as the harness type and length and the resistance values.


  • Transmission rates are much faster than those in conventional communication (up to 1 Mbps), allowing much more data to be sent.
  • It is exceptionally immune to noise, and the data obtained from each error detection device is more reliable.
  • Each ECU connected via the CAN communicates independently, therefore if the ECU enters damaged mode, communications can be continued in some cases.

STRUCTURE





  • The CAN bus line consists of two lines, CAN_L and CAN_H (CAN Low and CAN High, respectively), as well as two terminal resistors (A twisted-pair cable, highly resistant to noise, is used for the communications line).
  • The CAN bus line connecting the two terminal resistors is the main bus line, and the CAN bus line connecting each ECU is the sub-bus line.
  • The terminal resistors are installed in the ASTC-ECU and combination meter to stabilize communication signals (The terminal resistance is set at approximately 120 Ω).
  • ECUs and sensor are connected in the CAN bus line as follows.

    • ASTC-ECU <vehicles with ASTC>
    • Resistor <vehicles without ASTC>
    • G and yaw rate sensor
    • SRS-ECU
    • Engine-ECU <3000-M/T, 3200>
    • Engine-A/T-ECU <3000-A/T, 3800>
    • A/T-ECU <3200-A/T>
    • Immobilizer-ECU <3200>
    • Steering wheel sensor
    • Transfer-ECU
    • Centre display
    • ETACS-ECU
    • Combination meter
    • CAN converter-ECU <vehicles with auto lamp or security alarm>