CAN COMMUNICATION SYSTEM(for LHD) Open in CAN Main Wire

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

  • CAN main wire or connector

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector

  • No. 3 CAN junction connector

  • ECM

  • Combination meter assembly

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A01KCXFE01

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

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.

  • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS WIRE (DLC3 CAN BRANCH WIRE)


    1. A01KD2LC01
      *a Front view of DLC3

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G14-6 (CANH) - G14-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

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


    1. Disconnect the No. 1 CAN junction connectors.

      A01KCFKC18
      *1 No. 1 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 - -
      Code Color (CANH Side) Color (CANL Side) Connect to
      G118 L W No. 3 CAN Junction Connector
      G119 V W 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
      G118-1 (CANH) - G118-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      G119-1 (CANH) - G119-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG (to No. 3 CAN junction connector CAN main wire)
      NG (to No. 2 CAN junction connector CAN main wire)

    OK

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    NG (to No. 2 CAN junction connector CAN main wire)

    CONNECT CONNECTOR Click here

    NG (to No. 3 CAN junction connector CAN main wire)

  3. CONNECT CONNECTOR


    1. Reconnect all wire harness No. 1 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the No. 3 CAN junction connectors.

      A01KCIUC05
      *1 No. 3 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 3 CAN Junction Connector)

      		 - -
      Code Color (CANH Side) Color (CANL Side) Connect to
      N27 Y W ECM
      N28 L W 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
      N27-1 (CANH) - N27-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      N28-1 (CANH) - N28-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG (to ECM CAN main wire)
      NG (to No. 1 CAN junction connector CAN main wire)

    OK

    REPLACE NO. 3 CAN JUNCTION CONNECTOR

    NG (to No. 1 CAN junction connector CAN main wire)

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

    NG (to ECM CAN main wire)

  5. CONNECT CONNECTOR


    1. Reconnect all wire harness No. 3 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 3 CAN JUNCTION CONNECTOR)


    1. A01KDBQC01
      *A for 2AR-FE, 3ZR-FAE, 3ZR-FE
      *B for 1AD-FTV, 2AD-FHV, 2AD-CCo, 2AD-DPF
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      for 2AR-FE, 3ZR-FAE, 3ZR-FE
      Tester Connection Condition Specified Condition
      A62-13 (CANH) - A62-26 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      for 1AD-FTV, 2AD-FHV, 2AD-CCo, 2AD-DPF
      Tester Connection Condition Specified Condition
      A61-7 (CANH) - A61-6 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 2AR-FE: Click here
    REPLACE ECM for 3ZR-FAE: Click here
    REPLACE ECM for 3ZR-FE: Click here
    REPLACE ECM for 1AD-FTV: Click here
    REPLACE ECM for 2AD-FHV: Click here
    REPLACE ECM for 2AD-CCo, 2AD-DPF: Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 3 CAN JUNCTION CONNECTOR)

  7. CONNECT CONNECTOR


    1. Reconnect all wire harness No. 1 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. Disconnect the No. 2 CAN junction connectors.

      A01KCFKC19
      *1 No. 2 CAN Junction Connector - -
      *a

      Rear view of wire harness connector

      (to No. 2 CAN Junction Connector)

      		 - -
      Code Color (CANH Side) Color (CANL Side) Connect to
      G128 G W Combination Meter Assembly
      G129 V W 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
      G128-1 (CANH) - G128-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      G129-1 (CANH) - G129-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG (to combination meter assembly CAN main wire)
      NG (to No. 1 CAN junction connector CAN main wire)

    OK

    REPLACE NO. 2 CAN JUNCTION CONNECTOR

    NG (to No. 1 CAN junction connector CAN main wire)

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

    NG (to combination meter assembly CAN main wire)

  9. CONNECT CONNECTOR


    1. Reconnect all wire harness No. 2 CAN junction connectors.

      Result
      Proceed to
      NEXT

    NEXT

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


    1. A01KB6EC08
      *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
      G16-32 (CANH) - G16-31 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

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