CAN COMMUNICATION SYSTEM(for RHD) 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

  • Power management control ECU

  • Central gateway ECU

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector

  • No. 3 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

A000R5UE03

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary 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 power 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. A000PDGE02
      Text in Illustration
      *A for 2GR-FXE
      *B for 2AR-FSE
      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for 2GR-FXE
      Tester Connection Condition Specified Condition
      A20-13 (CANH) - A20-26 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      for 2AR-FSE
      Tester Connection Condition Specified Condition
      A79-13 (CANH) - A79-26 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 2GR-FXS) A
      OK (for 2AR-FSE) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

  2. CONNECT CONNECTOR


    1. Reconnect the A20*1 or A79*2 ECM connector.


      • *1: for 2GR-FXE

      • *2: for 2AR-FSE


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (POWER MANAGEMENT CONTROL ECU - NO. 3 CAN JUNCTION CONNECTOR)


    1. A000P4GE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N92-25 (CA1H) - N92-24 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

  4. CONNECT CONNECTOR


    1. Reconnect the N92 power management control ECU connector.


    NEXT

  5. CHECK FOR OPEN IN CAN BUS WIRE (CENTRAL GATEWAY ECU - NO. 2 CAN JUNCTION CONNECTOR)


    1. B002B67E02
      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
      N176-18 (CA4H) - N176-17 (CA4L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    OK

    REPLACE CENTRAL GATEWAY ECU Click here

    NG

  6. CONNECT CONNECTOR


    1. Reconnect the N176 central gateway ECU connector.


    NEXT

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


    1. A000MU6E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to No. 2 CAN Junction Connector
      *c to ECM

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connect to
      U67-5 (CANH) - U67-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 2 CAN junction connector
      U67-6 (CANH) - U67-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      Result
      Result Proceed to
      OK A
      NG (ECM CAN main wire) B
      NG (No. 2 CAN junction connector CAN main wire) C

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

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

    C

  8. CONNECT CONNECTOR


    1. Reconnect the U67 No. 1 CAN junction connector.


    NEXT

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


    1. A000PUEE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)
      *b to No. 3 CAN Junction Connector
      *c to Central Gateway ECU
      *d to No. 1 CAN Junction Connector

      Disconnect the No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connect to
      N178-1 (CANH) - N178-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 3 CAN junction connector
      N178-2 (CANH) - N178-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Central gateway ECU
      N178-7 (CANH) - N178-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (No. 1 CAN junction connector CAN main wire) B
      NG (Central gateway ECU CAN branch wire) C
      NG (No. 3 CAN junction connector CAN main wire) D

    A

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    B

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

    C

    REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU)

    D

  10. CONNECT CONNECTOR


    1. Reconnect the N178 No. 2 CAN junction connector.


    NEXT

  11. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 CAN JUNCTION CONNECTOR)


    1. A000PMYE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 CAN Junction Connector)
      *b to Power Management Control ECU
      *c to No. 2 CAN Junction Connector

      Disconnect the No. 3 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connect to
      N177-3 (CANH) - N177-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Power management control ECU
      N177-6 (CANH) - N177-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 2 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (No. 2 CAN junction connector CAN main wire) B
      NG (Power management control ECU CAN main wire) C

    A

    REPLACE NO. 3 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)