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CAN COMMUNICATION SYSTEM(for RHD without Central Gateway ECU) Open in CAN Main Wire

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DTC Code DTC Name
  Open in CAN Main Wire
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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

  • ECM

  • Combination meter assembly

  • DLC3 CAN branch wire or connector
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WIRING DIAGRAM

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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.

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  • 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.

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  • When replacing the combination meter assembly, make sure to replace it with a new one.

Tip:

  • 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.

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PROCEDURE


  1. Click here

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


    1. B0028U4C23
      *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
      G8-6 (CANH) - G8-14 (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.

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      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

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

  2. Click here

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


    1. B00272XC08
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to Combination Meter Assembly
      *c to No. 2 CAN Junction Connector

      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
      G67-5 (CANH) - G67-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      G67-6 (CANH) - G67-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to No. 2 CAN junction connector CAN main wire) B
      NG (to combination meter assembly CAN main wire) C

  3. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

  4. Click here

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


    1. B00272XC09
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)
      *b to ECM
      *c 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
      G68-5 (CANH) - G68-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      G68-6 (CANH) - G68-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (to ECM CAN main wire) (for 2TR-FE) B
      NG (to ECM CAN main wire) (for 1GR-FE) C
      NG (to ECM CAN main wire) (for 2KD-FTV) D
      NG (to ECM CAN main wire) (for 1GD-FTV, 2GD-FTV) E
      NG (to No. 1 CAN junction connector CAN main wire) F

  5. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

  6. Click here

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


    1. B0024UTC06
      *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
      Tester Connection Condition Specified Condition
      G45-13 (CANH) - G45-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

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

  7. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

  8. Click here

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


    1. B00271GC01
      *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
      Tester Connection Condition Specified Condition
      G88-31 (CANH) - G88-25 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

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

  9. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

  10. Click here

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


    1. B0024UTC07
      *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
      Tester Connection Condition Specified Condition
      G83-24 (CANH) - G83-23 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECMClick here

    • NG

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

  11. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

  12. Click here

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


    1. B0024UTC10
      *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
      Tester Connection Condition Specified Condition
      G85-17 (CANH) - G85-28 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ECM for 1GD-FTV:

      REPLACE ECMClick here

      REPLACE ECM for 2GD-FTV:

      REPLACE ECMClick here

    • NG

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

  13. Click here

    CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connectors.

      Result
      Proceed to
      NEXT

  14. Click here

    CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)


    1. B0025FBC12
      *a

      Front 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
      G9-36 (CANH) - G9-35 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE COMBINATION METER ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)