CAN COMMUNICATION SYSTEM(for LHD) Open in Bus 2 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the bus 2 main lines and/or a central gateway ECU CAN branch wire when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU is 70 Ω or higher

Detection Item Trouble Area
Resistance between terminals 18 (CA4H) and 17 (CA4L) of central gateway ECU is 70 Ω or higher.

  • Bus 2 CAN main wire or connector

  • Bus 2 CAN branch wire or connector

  • ECM

  • Combination meter assembly

  • Central gateway ECU

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector

This malfunction is not related to the lines of a bus 2 branch except the central gateway ECU CAN branch wires or to ECUs or sensors connected a bus 2 branch.

WIRING DIAGRAM

B0018JJE03

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • After the repair, perform CAN Bus Check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

Tech Tips


  • Operating the engine switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • 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.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 1 CAN JUNCTION CONNECTOR)


    1. for 1VD-FTV:


      1. B001AEHE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the ECM connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A85-41 (CANH) - A85-49 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    2. for 3UR-FE:


      1. B001845E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the cable from the negative (-) battery terminal.

      2. Disconnect the ECM connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A38-11 (CANH) - A38-19 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1VD-FTV) A
      OK (for 3UR-FE) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

  2. CONNECT CONNECTOR


    1. Reconnect the A85*1 or A38*2 ECM connector.


      • *1: for 1VD-FTV

      • *2: for 3UR-FE


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)


    1. B0018IYE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E120-39 (CANH) - E120-40 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  4. CONNECT CONNECTOR


    1. Reconnect the E120 combination meter assembly connector.


    NEXT

  5. CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR)


    1. B0018DSE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Central Gateway ECU)

      Disconnect the central gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E137-18 (CA4H) - E137-17 (CA4L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    OK

    REPLACE CENTRAL GATEWAY ECU Click here

    NG

  6. CONNECT CONNECTOR


    1. Reconnect the E137 central gateway ECU connector.


    NEXT

  7. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 1 CAN junction connector.

      B001A7RE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b to No. 2 CAN Junction Connector
      *c to ECM *d to Central Gateway ECU

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connect to
      E161-1 (CANH) - E161-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      E161-7 (CANH) - E161-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      E161-9 (CANH) - E161-19 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Central Gateway ECU
      Result
      Result Proceed to
      OK A
      NG (ECM CAN main wire) B
      NG (Central Gateway ECU CAN branch wire) C
      NG (No. 2 CAN junction connector CAN main wire) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - ECM)

    C

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU)

    D

  8. CONNECT CONNECTOR


    1. Reconnect the E161 No. 1 CAN junction connector.


    NEXT

  9. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 2 CAN junction connector.

      B0018ZSE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 *b to No. 1 CAN Junction Connector
      *c to Combination Meter Assembly - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connect to
      E158-1 (CANH) - E158-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      E158-7 (CANH) - E158-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination meter assembly
      Result
      Result Proceed to
      OK A
      NG (Combination meter assembly CAN main wire) B
      NG (No. 1 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)