CAN COMMUNICATION SYSTEM Open in CAN Main Bus Line (RHD Models)

DESCRIPTION

There may be an open circuit in one of the V1 bus main wires and/or a DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

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

  • DLC3 branch wire or connector

  • CAN main bus wire or connector

  • ECM

  • Plugin charge control ECU assembly

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

This malfunction is not related to the wires of a CAN main bus branch or to ECUs or sensors connected a CAN main bus branch.

WIRING DIAGRAM

A00443GE07

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN main bus wires and between CAN main bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • 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 WIRES (DLC3 BRANCH WIRE)


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

    2. A0041YHE86
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L55-6 (CANH) - L55-14 (CANL) Cable disconnected from negative (-) auxiliary 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.


    NG

    REPAIR OR REPLACE CAN MAIN BRANCH WIRES CONNECTED TO DLC3

    OK

  2. CHECK FOR OPEN IN CAN BUS WIRES (ECM - CAN NO. 1 J/C)


    1. A00406ME75
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the A56 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A56-13 (CANH) -A56-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRES (PLUGIN CHARGE CONTROL ECU ASSEMBLY - CAN NO. 2 J/C) Click here

    OK

    REPLACE ECM Click here

  3. CHECK FOR OPEN IN CAN BUS WIRES (PLUGIN CHARGE CONTROL ECU ASSEMBLY - CAN NO. 2 J/C)


    1. Reconnect the A56 ECM connector.

    2. A00438BE17
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Plugin Charge Control ECU Assembly)

      Disconnect the S21 plugin charge control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      S21-25 (CA1H) - S21-26 (CA1L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRES (CAN NO. 2 J/C) Click here

    OK

    REPLACE PLUGIN CHARGE CONTROL ECU ASSEMBLY Click here

  4. CHECK FOR OPEN IN CAN BUS WIRES (CAN NO. 2 J/C)


    1. Reconnect the S21 plugin charge control ECU assembly.

    2. A0043H6E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *b to CAN No. 1 Junction Connector
      *c to Plugin Charge Control ECU Assembly

      Disconnect the L101 and L103 CAN No. 2 junction connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L101-1 (CANH) - L101-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Plugin charge control ECU assembly
      L103-1 (CANH) - L103-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 1 junction connector
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connected to
      L101 B W Plugin charge control ECU assembly
      L103 V W CAN No. 1 junction connector

      Note


      • Before disconnecting the connectors, make a note of where they are connected.

      • Reconnect each connector to its original position.

      Result
      Result Proceed to
      OK A
      NG (Plugin charge control ECU assembly main wire) B
      NG (CAN No. 1 junction connector main wire) C

    B

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 2 J/C - PLUGIN CHARGE CONTROL ECU ASSEMBLY)

    C

    CHECK FOR OPEN IN CAN BUS WIRES (CAN NO. 1 J/C) Click here

    A

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN CAN BUS WIRES (CAN NO. 1 J/C)


    1. Reconnect the L101 and L103 CAN No. 2 junction connectors.

    2. A0043GJE02
      Text in Illustration
      *a

      Rear view of wire harness connector

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

      Disconnect the L90 and L97 CAN No. 1 junction connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      L90-1 (CANH) - L90-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω ECM
      L97-1 (CANH) - L97-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 2 junction connector
      Wiring Color
      Code Color (CANH Side) Color (CANL Side) Connected to
      L90 P V ECM
      L97 V W CAN No. 2 junction connector

      Note


      • Before disconnecting the connectors, make a note of where they are connected.

      • Reconnect each connector to its original position.

      Result
      Result Proceed to
      OK A
      NG (CAN No. 2 junction connector main wire) B
      NG (ECM main wire) C

    B

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C)

    C

    REPAIR OR REPLACE CAN MAIN BUS WIRE OR CONNECTOR (CAN NO. 1 J/C - ECM)

    A

    REPLACE CAN NO. 1 JUNCTION CONNECTOR