Can Communication System (For Lhd With Entry And Start System) System Description

  1. BRIEF DESCRIPTION

  1. DEFINITION OF TERMS

  1. CIRCUIT DESCRIPTION

  1. ECUS OR SENSORS WHICH COMMUNICATE VIA CAN COMMUNICATION SYSTEM

  1. DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM

  1. NOTES REGARDING TROUBLESHOOTING

  1. HOW TO DISTINGUISH CAN JUNCTION CONNECTOR CONNECTORS

Can Communication System (For Lhd With Entry And Start 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 detection 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.


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.


CIRCUIT DESCRIPTION

  1. The V1 bus, V2 bus MS bus, power management bus, powertrain bus, parking assist bus, local bus and sensor bus have termination circuits with a resistance of 120 Ω x 2. High speed communication at 250 kbps and 500 kbps is possible.


ECUS OR SENSORS WHICH COMMUNICATE VIA CAN COMMUNICATION SYSTEM

  1. ECM

  2. Main body ECU (multiplex network body ECU)

  3. Master cylinder solenoid (skid control ECU)*1

  4. Brake actuator assembly (skid control ECU)*2

  5. Four wheel drive control ECU

  6. Yaw rate sensor assembly

  7. DLC3

  8. Spiral cable sub-assembly (steering angle sensor)

  9. Power steering ECU assembly

  10. Navigation receiver assembly*3

  11. Radio and display receiver assembly*4

  12. Certification ECU (smart key ECU assembly)

  13. Power management control ECU

  14. Center airbag sensor assembly

  15. Combination meter assembly

  16. Suspension control ECU*5

  17. Headlight swivel ECU assembly*6

  18. Seat belt control ECU*7

  19. Stabilizer control ECU*8

  20. Driving support ECU assembly*7

  21. Parking assist ECU*9

  22. Clearance warning ECU assembly*10

  23. Blind spot monitor sensor LH*11

  24. Blind spot monitor sensor RH*11

  25. Front power seat switch LH*12

  26. Multiplex tilt and telescopic ECU*13

  27. Driving support switch control ECU*14

  28. Air conditioning amplifier assembly

  29. Transmission control ECU assembly*15

  30. Millimeter wave radar sensor assembly*7

  31. Nitrogen oxides sensor*16

  32. Urea pump control ECU*16

    1. *1: for 1GR-FE, 1KD-FTV, 1GD-FTV
    2. *2: for 2TR-FE
    3. *3: w/ Navigation System (for Navigation Receiver Type)
    4. *4: w/ Navigation System (for Radio and Display Type) or w/o Navigation System
    5. *5: w/ Air Suspension System
    6. *6: for LED Headlight
    7. *7: w/ Pre-crash Safety System
    8. *8: w/ Kinetic Dynamic Suspension System
    9. *9: w/ Side Monitor System
    10. *10: w/ TOYOTA Parking Assist-sensor System
    11. *11: w/ Blind Spot Monitor System
    12. *12: w/ Seat Position Memory
    13. *13: for Power Tilt and Power Telescopic Steering Column
    14. *14: w/ Multi-function Switch
    15. *15: for 1KD-FTV and Automatic Transmission System
    16. *16: w/ Urea SCR System

DIAGNOSTIC CODES FOR CAN COMMUNICATION SYSTEM

  1. DTCs for the CAN communication system are as follows: U0073, U0100, U0101, U0104, U010E/A2, U0114, U0122, U0123, U0124, U0126, U0129, U0131, U0132, U0139, U0140, U0142, U0151, U0155, U0163, U0164, U0182, U0208, U0232, U0233, U0235, U029D/A2, U0327, U1000, U1002, U1100, U110B, U1102, U1104, U1110, U1114, U1115, U1133, B15F5, B15F6, B15F7, B15F8, B2621 and B2624.


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.


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.

    HINT:
    See "Terminals of ECU" (LandCruiser RM000000XVK0EZX.html) for bus line color or the type of connecting surface.