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

DESCRIPTION

There may be an open circuit in the CAN 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.

  • CAN bus main wire or connector

  • CAN junction connector CTR

  • CAN junction connector RH

  • ECM

  • Combination meter

WIRING DIAGRAM

A017DTIE01

INSPECTION PROCEDURE

Note


  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition 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 ignition switch, any other switches or the doors. If the doors need to be opened in order to check the connectors, open the doors and leave them open.

Tech Tips


  • Operating the ignition 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 DLC3


    1. A017E9OE59

      Turn the ignition switch off.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D47-6 (CANH) - D47-14 (CANL) Ignition switch off 108 to 132 Ω

      Note

      When the measured value is 133 Ω or higher and a CAN communication system diagnostic trouble code 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" Click here after repairing the trouble area.


    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

    OK

  2. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR CTR)


    1. Turn the ignition switch off.

    2. Disconnect the CAN junction connector CTR.

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

      A017EIBE32
      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D47-1 (CANH) - D47-12 (CANL) SB - W CAN junction connector RH Ignition switch off 108 to 132 Ω
      D47-5 (CANH) - D47-16 (CANL) R - W ECM Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (CAN junction connector main wire) B
      NG (ECM main wire) C

    B

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

    C

    CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR RH) Click here

    A

    REPLACE CAN JUNCTION CONNECTOR CTR

  3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM)


    1. Reconnect the CAN junction connector RH.

    2. Disconnect the ECM connector.

    3. A017EELE04

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D32-33 (CANH) - D32-34 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR RH - ECM)

    OK

    REPLACE ECM Click here

  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR RH)


    1. Reconnect the CAN junction connector CTR.

    2. Disconnect the CAN junction connector RH.

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

      A017EIBE33
      Standard resistance
      Tester Connection Wiring Color Connect to Condition Specified Condition
      D51-3 (CANH) - D51-14 (CANL) R - W Combination meter Ignition switch off 108 to 132 Ω
      D51-5 (CANH) - D51-16 (CANL) SB - W CAN junction connector CTR Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (Combination meter main wire) B
      NG (CAN junction connector) C

    B

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

    C

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR CTR - CAN JUNCTION CONNECTOR RH)

    A

    REPLACE CAN JUNCTION CONNECTOR RH

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


    1. Reconnect the CAN junction connector CTR.

    2. Disconnect the combination meter connector.

    3. A017BD2E21

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

      Standard resistance
      Tester Connection Condition Specified Condition
      E1-25 (CANH) - E1-26 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR CTR - COMBINATION METER)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here