CAN COMMUNICATION SYSTEM Open in CAN Main Bus Line

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 and connector

  • ECM

  • Combination meter assembly

  • CAN junction connector

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A01BHKJE01

INSPECTION PROCEDURE

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an airbag system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

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


    1. A01BGEYE35
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H23-6 (CANH) - H23-14 (CANL) Ignition 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 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 BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

  3. CHECK FOR OPEN IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - ECM)


    1. A01BAKRE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN Junction Connector)

      Disconnect the CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H63-1 (CANH) - H63-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  4. CHECK FOR OPEN IN CAN BUS WIRE (CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A01BAKRE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN Junction Connector)

      Disconnect the CAN junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H65-1 (CANH) - H65-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR

  5. CONNECT CONNECTOR


    1. Reconnect all wire harness CAN junction connectors.


    NEXT

  6. CHECK FOR OPEN IN CAN BUS WIRE (ECM - CAN JUNCTION CONNECTOR)


    1. A01BI2BE01
      Text in Illustration
      *A for 1KD-FTV (w/ DPF)
      *B for 1KD-FTV (w/o DPF)
      *C for 2KD-FTV
      *D for 1TR-FE, 2TR-FE
      *E for 5L-E
      *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 1KD-FTV (w/ DPF)
      Tester Connection Switch Condition Specified Condition
      B73-7 (CANH) - B73-6 (CANL) Ignition switch off 108 to 132 Ω
      for 1KD-FTV (w/o DPF)
      Tester Connection Switch Condition Specified Condition
      B72-7 (CANH) - B72-6 (CANL) Ignition switch off 108 to 132 Ω
      for 2KD-FTV
      Tester Connection Switch Condition Specified Condition
      B88-6 (CANH) - B88-7 (CANL) Ignition switch off 108 to 132 Ω
      for 1TR-FE, 2TR-FE
      Tester Connection Switch Condition Specified Condition
      B71-8 (CANH) - B71-9 (CANL) Ignition switch off 108 to 132 Ω
      for 5L-E
      Tester Connection Switch Condition Specified Condition
      B74-10 (CANH) - B74-11 (CANL) Ignition switch off 108 to 132 Ω

      Tech Tips

      *: Replacement procedure:



    NG

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

    OK

    REPLACE ECM*

  7. CONNECT CONNECTOR


    1. Reconnect all wire harness CAN junction connectors.


    NEXT

  8. CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY - CAN JUNCTION CONNECTOR)


    1. A01BFJ4E04
      Text in Illustration
      *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 Switch Condition Specified Condition
      H20-23 (CANH) - H20-22 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER ASSEMBLY - CAN JUNCTION CONNECTOR)

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here