CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Note


  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

  • This section describes the standard values for all CAN related components.

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.


  1. CAN NO. 1 JUNCTION CONNECTOR (for LHD)


    1. Check the CAN No. 1 junction connector.


      1. Connection diagram

        A003U4VE51
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b to CAN No.2 Junction Connector
        *c to Steering Angle Sensor *d to Main Body ECU
        *e to Power Steering ECU *f to DLC3
        *g to Skid Control ECU (Brake Booster with Master Cylinder Assembly) *h to ECM

    2. Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.

      Terminal No. (Symbol) Wiring Color Connected to
      E124-1 (CANH) B CAN No.2 junction connector
      E124-12 (CANL) W
      E124-2 (CANH) BR Steering angle sensor
      E124-13 (CANL) W
      E124-3 (CANH) BR Main body ECU
      E124-14 (CANL) W
      E124-4 (CANH) SB Power steering ECU
      E124-15 (CANL) W
      E124-5 (CANH) LG DLC3
      E124-16 (CANL) W
      E124-10 (CANH) V Skid Control ECU (Brake booster with master cylinder assembly)
      E124-21 (CANL) W
      E124-11 (CANH) B ECM
      E124-22 (CANL) W

  2. CAN NO. 2 JUNCTION CONNECTOR (for LHD)


    1. Check the CAN No. 2 junction connector.


      1. Connection diagram

        A003U4VE52
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 2 Junction Connector)

        		 *b to CAN No. 1 Junction Connector
        *c to Power Management Control ECU *d to Transmission Control ECU Assembly
        *e to Center Airbag Sensor Assembly *f to Yaw Rate and Acceleration Sensor
        *g to Certification ECU *h to Combination Meter

    2. Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.

      Terminal No. (Symbol) Wiring Color Connected to
      E125-1 (CANH) B CAN No. 1 junction connector
      E125-12 (CANL) W
      E125-6 (CANH) BR Power management control ECU
      E125-17 (CANL) W
      E125-7 (CANH) B Transmission control ECU assembly
      E125-18 (CANL) W
      E125-8 (CANH) Y Center airbag sensor assembly
      E125-19 (CANL) W
      E125-9 (CANH) L Yaw rate and acceleration sensor
      E125-20 (CANL) W
      E125-10 (CANH) SB Certification ECU
      E125-21 (CANL) W
      E125-11 (CANH) G Combination meter assembly
      E125-22 (CANL) W

  3. CAN NO. 1 JUNCTION CONNECTOR (for RHD)


    1. Check the CAN No. 1 junction connector.


      1. Connection diagram

        A003U4VE54
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 1 Junction Connector)

        		 *b to CAN No. 2 Junction Connector
        *c to Steering Angle Sensor *d to Power Steering ECU
        *e to DLC3 *f to Center Airbag Sensor Assembly
        *g to Yaw Rate and Acceleration Sensor *h to Certification ECU
        *i to Combination Meter Assembly - -

    2. Check the connection diagram of the components which are connected to the CAN No. 1 junction connector.

      Terminal No. (Symbol) Wiring Color Connected to
      E125-1 (CANH) B CAN No. 2 junction connector
      E125-12 (CANL) W
      E125-2 (CANH) BR Steering angle sensor
      E125-13 (CANL) W
      E125-4 (CANH) SB Power steering ECU
      E125-15 (CANL) W
      E125-5 (CANH) LG DLC3
      E125-16 (CANL) W
      E125-8 (CANH) Y Center airbag sensor assembly
      E125-19 (CANL) W
      E125-9 (CANH) L Yaw rate and acceleration sensor
      E125-20 (CANL) W
      E125-10 (CANH) SB Certification ECU
      E125-21 (CANL) W
      E125-11 (CANH) G Combination meter assembly
      E125-22 (CANL) W

  4. CAN NO. 2 JUNCTION CONNECTOR (for RHD)


    1. Check the CAN No. 2 junction connector.


      1. Connection diagram

        A003U4VE53
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 2 Junction Connector)

        		 *b to CAN No. 1 Junction Connector
        *c to Main Body ECU *d to Power Management Control ECU
        *e to Transmission Control ECU Assembly *f to Skid Control ECU (Brake Booster with Master Cylinder Assembly)
        *g to ECM - -

    2. Check the connection diagram of the components which are connected to the CAN No. 2 junction connector.

      Terminal No. (Symbol) Wiring Color Connected to
      E124-1 (CANH) B CAN No. 1 junction connector
      E124-12 (CANL) W
      E124-3 (CANH) BR Main body ECU
      E124-14 (CANL) W
      E124-6 (CANH) BR Power management control ECU
      E124-17 (CANL) W
      E124-7 (CANH) B Transmission control ECU assembly
      E124-18 (CANL) W
      E124-10 (CANH) V Skid control ECU (Brake booster with master cylinder assembly))
      E124-21 (CANL) W
      E124-11 (CANH) B ECM
      E124-22 (CANL) W

  5. CAN NO. 4 JUNCTION CONNECTOR


    1. Check the CAN No. 4 junction connector.


      1. Connection diagram

        A003U4VE55
        Text in Illustration
        *a

        Front view of wire harness connector

        (to CAN No. 4 Junction Connector)

        		 *b to Power Management Control ECU
        *c to Air Conditioning Amplifier *d to Skid Control ECU
        *e to ECM - -

    2. Check the connection diagram of the components which are connected to the CAN No. 4 junction connector.

      Terminal No. (Symbol) Wiring Color Connected to
      E126-12 (CANH) L Power management control ECU
      E126-1 (CANL) Y
      E126-13 (CANH) Y Air conditioning amplifier
      E126-2 (CANL) BR
      E126-14 (CANH) P Skid control ECU
      E126-3 (CANL) V
      E126-15 (CANH) B ECM
      E126-4 (CANL) W

  6. DLC3


    1. Measure the resistance according to the value(s) in the table below.

      A003S6HE10
      Text in Illustration
      *1 DLC3 - -

  7. ECM


    1. Disconnect the ECM connectors.

      A003UXXE17
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Measure the resistance according to the value(s) in the table below.

    3. COMBINATION METER ASSEMBLY


      1. Disconnect the combination meter assembly connector.

        A003SKAE19
      4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      		 - -

  8. Measure the resistance according to the value(s) in the table below.

  9. POWER MANAGEMENT CONTROL ECU

    A003TO4E22

    1. V1 Bus Branch Wire


      1. A003UKVE15
    10. Text in Illustration
    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

Disconnect the power management control ECU connector.

  • Measure the resistance according to the value(s) in the table below.

  • Power Management Bus Main Wire


    1. A003UKVE16
    • Text in Illustration
    *a

    Rear view of wire harness connector

    (to Power Management Control ECU)

    Disconnect the power management control ECU connector.

  • Measure the resistance according to the value(s) in the table below.

  • MAIN BODY ECU

    A003T11E06
    • Text in Illustration
    *A for LHD *B for RHD
    *C w/ Theft Deterrent System *D w/o Theft Deterrent System

    1. Disconnect the main body ECU connector.

      A003UFCE05
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Main Body ECU)

      		 - -

    2. Measure the resistance according to the value(s) in the table below.

    3. SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY)


      1. A003UTKE48
      4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

      Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    4. Measure the resistance according to the value(s) in the table below.

    5. STEERING ANGLE SENSOR


      1. A003RNVE64
      6. Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Angle Sensor)

      Disconnect the steering angle sensor connector.

    6. Measure the resistance according to the value(s) in the table below.

    7. YAW RATE AND ACCELERATION SENSOR


      1. A003RTDE31
      8. Text in Illustration
      *1 DLC3
      *a

      Front view of wire harness connector

      (to Yaw Rate and Acceleration Sensor)

      Disconnect the yaw rate and acceleration sensor connector.

    8. Measure the resistance according to the value(s) in the table below.

    9. POWER STEERING ECU


      1. Disconnect the power steering ECU connectors.

        A003UTBE12
      10. Text in Illustration
      *a

      Front view of wire harness connector

      (to Power Steering ECU)

      		 - -

    10. Measure the resistance according to the value(s) in the table below.

    11. CENTER AIRBAG SENSOR ASSEMBLY


      1. Disconnect the center airbag sensor assembly connector.

        A003UQRE13
      12. Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 - -

    12. Measure the resistance according to the value(s) in the table below.

    13. CERTIFICATION ECU (SMART KEY ECU)


      1. Disconnect the certification ECU connector.

        A003T6JE03
      14. Text in Illustration
      *a

      Front view of wire harness connector

      (to Certification ECU)

      		 - -

    14. Measure the resistance according to the value(s) in the table below.

    15. TRANSMISSION CONTROL ECU ASSEMBLY

      A003UG9E06

      1. A003SMCE07
      16. Text in Illustration
      *a

      Front view of wire harness connector

      (to Transmission Control ECU Assembly)

      Disconnect the transmission control ECU assembly connectors.

    16. Measure the resistance according to the value(s) in the table below.

    17. AIR CONDITIONING AMPLIFIER ASSEMBLY


      1. Disconnect the air conditioning amplifier assembly connector.

        A003SKAE20
      18. Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      		 - -

    18. Measure the resistance according to the value(s) in the table below.