CAN COMMUNICATION SYSTEM CAN Main Wire for Disconnection (w/o Stop and Start System)

DESCRIPTION

There may be an open circuit in the 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 main wire or connector

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

  • ECM

  • Combination meter assembly (combination meter ECU)

WIRING DIAGRAM

A0117SAE02

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 doors need to be opened in order to check connectors, open the doors and leave them open.

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. CHECK DLC3


    1. Turn the ignition switch off.

    2. A011935E01
      Text in Illustration
      *1 Front view of DLC3

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

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

      Note

      When the measured value is 132 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 (CAN-H, CAN-L)

    OK

  2. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN J/C NO. 2 SIDE)


    1. Turn the ignition switch off.

    2. A0119GBE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 junction connector)

      Disconnect the A49 CAN No. 1 junction connector.

    3. Measure the resistance according to the value in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A49-2 (CANH) - A49-1 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  3. CONNECT CONNECTOR


    1. Reconnect the CAN No. 1 junction connector.


    NEXT

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


    1. Turn the ignition switch off.

    2. A0118OOE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2 for 1KR-FE and 1NR-FE
      *3 for 1ND-TV

      Disconnect the A18 or A19 ECM connector.

    3. Measure the resistance according to the value in the table below.

      Standard Resistance:
      for 1KR-FE and 1NR-FE
      Tester Connection Switch Condition Specified Condition
      A18-8 (CANH) - A18-9 (CANL) Ignition switch off 108 to 132 Ω
      for 1ND-TV
      Tester Connection Switch Condition Specified Condition
      A19-3 (CANH) - A19-4 (CANL) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      NG A
      OK (for 1KR-FE engine) B
      OK (for 1NR-FE engine) C
      OK (for 1ND-TV engine) D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    A

  5. CONNECT CONNECTOR


    1. Reconnect the ECM connector.


    NEXT

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


    1. Turn the ignition switch off.

    2. A0119GBE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 junction connector)

      Disconnect the A49 CAN No. 1 junction connector.

    3. Measure the resistance according to the value in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A49-6 (CANH) - A49-4 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  7. CONNECT CONNECTOR


    1. Reconnect the CAN No. 1 junction connector.


    NEXT

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


    1. Turn the ignition switch off.

    2. A01189VE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly (Combination Meter ECU))

      Disconnect the D1 combination meter assembly (combination meter ECU) connector.

    3. Measure the resistance according to the value in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D1-21 (CANH) - D1-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  9. CONNECT CONNECTOR


    1. Reconnect the combination meter assembly (combination meter ECU) connector.


    NEXT

  10. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 2 J/C - COMBINATION METER ECU)


    1. Turn the ignition switch off.

    2. A011BO3E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 junction connector)

      Disconnect the D71 CAN No. 2 junction connector.

    3. Measure the resistance according to the value in the table below.

      Standard Resistance:
      Tester Connection Switch Condition Specified Condition
      D71-5 (CANH) - D71-16 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

    OK

  11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 1 J/C - CAN NO. 2 J/C)


    1. Turn the ignition switch off.

    2. A011BO3E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 junction connector)

      Measure the resistance according to the value in the table below.

      Standard Resistance:
      Tester Connection Switch Condition Specified Condition
      D71-1 (CANH) - D71-12 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)

    OK

    REPLACE CAN NO. 2 JUNCTION CONNECTOR