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

DESCRIPTION

There may be an open circuit in the CAN bus main wire and/or the 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 bus main wire or connector

  • Combination meter

  • ECM

  • CAN junction connector CTR

  • CAN No. 1 junction connector RH

  • CAN No. 2 junction connector

  • CAN No. 3 junction connector

  • CAN No. 5 junction connector

  • CAN No. 6 junction connector

WIRING DIAGRAM

A01CEBCE02

INSPECTION PROCEDURE

Note


  • Turn the engine switch off before measuring the resistances of the CAN main wires and the CAN branch wires.

  • After the engine switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

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

Tech Tips


  • Operating the engine 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 will help determine the cause of the malfunction.

PROCEDURE


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


    1. Turn the engine switch off.

    2. A01CEOQE48

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G8-6 (CANH) - G8-14 (CANL) Engine switch off 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 wire. 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 BRANCH WIRE CONNECTED TO DLC3

    OK

  2. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - COMBINATION METER)


    1. A01CFC1E13

      Disconnect the CAN main wire connector (G88) from the CAN No. 1 junction connector RH (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G88-1 (CANH) - G88-2 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN NO. 5 J/C) Click here

    OK

  3. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - ECM)


    1. A01CB89E04

      Disconnect the CAN main wire connector (G67) from the CAN No. 1 junction connector RH (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G67-1 (CANH) - G67-2 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN J/C CTR) Click here

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR RH

  4. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN NO. 5 J/C)


    1. Reconnect the CAN main wire connector (G88) to the CAN No. 1 junction connector RH (w/o earth terminal).

    2. A01CGINE14

      Disconnect the connector of the CAN No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-6 (CANH) - M22-17 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C RH - CAN NO. 5 J/C)

    OK

  5. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 5 J/C - COMBINATION METER)


    1. A01CGINE16

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      M22-7 (CANH) - M22-18 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER) Click here

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER)


    1. Reconnect the connector of the CAN No. 5 junction connector.

    2. A01CD9PE06

      Disconnect the connector of the combination meter.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G19-13 (CANH) - G19-14 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 5 J/C - COMBINATION METER)

    OK

    REPLACE COMBINATION METER Click here

  7. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 1 J/C RH - CAN J/C CTR)


    1. Reconnect the CAN main wire connector (G88) to the CAN No. 1 junction connector RH (w/o earth terminal).

    2. Reconnect the CAN main wire connector (G67) to the CAN No. 1 junction connector RH (w/o earth terminal).

    3. A01CFC1E08

      Disconnect the CAN main wire connector (G62) from the CAN junction connector CTR (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G62-1 (CANH) - G62-2 (CANL) Engine switch off 108 to 132 Ω

    NG

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

    OK

  8. CHECK FOR OPEN IN CAN BUS WIRE (CAN J/C CTR - ECM)


    1. Reconnect the CAN main wire connector (G62) to the CAN junction connector CTR (w/o earth terminal).

    2. A01CD8NE07

      Disconnect the CAN main wire connector (G61) from the CAN junction connector CTR (w/o earth terminal).

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G61-1 (CANH) - G61-2 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 3 J/C - CAN J/C CTR) Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR CTR

  9. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 3 J/C - CAN J/C CTR)


    1. Reconnect the CAN main wire connector (G61) to the CAN junction connector CTR (w/o earth terminal).

    2. A01CEPAE02

      Disconnect the connector (F10) of the CAN No. 3 junction connector.

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F10-8 (CANH) - F10-19 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN J/C CTR - CAN NO. 3 J/C)

    OK

  10. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 3 J/C - CAN NO. 2 J/C)


    1. A01CEPAE03

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F10-9 (CANH) - F10-20 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 3 J/C) Click here

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  11. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 3 J/C)


    1. Reconnect the connector (F10) of the CAN junction connector.

    2. A01CAQSE06

      Disconnect the connector of the CAN No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-5 (CANH) - G56-16 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 3 J/C)

    OK

  12. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C)


    1. A01CAQSE05

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G56-1 (CANH) - G56-12 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C) Click here

    OK

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

  13. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 6 J/C)


    1. Reconnect the connector (G56) of the CAN No. 2 junction connector.

    2. A01CC0DE01

      Disconnect the connector (A44) of the CAN No. 6 junction connector.

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-3 (CANH) - A44-5 (CANL) Engine switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 6 J/C)

    OK

  14. CHECK FOR OPEN IN CAN BUS WIRE (CAN NO. 6 J/C - ECM)


    1. A01CC0DE02

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A44-1 (CANH) - A44-6 (CANL) Engine switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS WIRE (ECM) Click here

    OK

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  15. CHECK FOR OPEN IN CAN BUS WIRE (ECM)


    1. Reconnect the connector of the CAN No. 6 (A44) junction connector.

    2. A01CD8TE06

      Disconnect the connector of the ECM.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A8-41 (CANH) - A8-49 (CANL) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (2AZ-FE) A
      OK (2GR-FE) B
      NG C

    B

    REPLACE ECM (for 2GR-FE) Click here

    C

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - ECM)

    A

    REPLACE ECM (for 2AZ-FE) Click here