CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) 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

B001YTSE06

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 ignition 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 ignition 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 ignition 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. B001YT4E02
      Text in Illustration
      *A for 1UR-FE, 1GR-FE
      *B for 1VD-FTV
      *C for 3UR-FE
      *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
      for 1UR-FE, 1GR-FE:
      Tester Connection Condition Specified Condition
      A38-10 (CANH) - A38-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 1VD-FTV:
      Tester Connection Condition Specified Condition
      A38-41 (CANH) - A38-49 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 3UR-FE:
      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 1UR-FE) A
      OK (for 1VD-FTV) B
      OK (for 1GR-FE) C
      OK (for 3UR-FE) D
      NG E

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

  2. CONNECT CONNECTOR


    1. Reconnect the A38 ECM connector.


    NEXT

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


    1. B001VKJE01
      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
      E119-39 (CANH) - E119-40 (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 E119 combination meter assembly connector.


    NEXT

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


    1. B001YU8E01
      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
      E145-18 (CA4H) - E145-17 (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 E145 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.

      B001YJ2E01
      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
      E135-1 (CANH) - E135-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN junction connector
      E135-7 (CANH) - E135-17 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      E135-9 (CANH) - E135-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher 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 E135 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.

      B001XU0E01
      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
      E133-1 (CANH) - E133-11 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction connector
      E133-7 (CANH) - E133-17 (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)