CAN COMMUNICATION SYSTEM(w/o Toyota Safety Sense) Open in CAN Main Bus Line (LHD Models)

DESCRIPTION

There may be an open circuit in the CAN main wire and/or DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 Ω or higher.

  • CAN main wire or connector

  • No. 1 junction connector

  • No. 2 junction connector

  • ECM

  • Combination meter assembly

  • DLC3 branch wire or connector

WIRING DIAGRAM

A01VG3HE04

CAUTION / NOTICE / HINT

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. A01VLJ8E01
      Text in Illustration
      *a Front view of DLC3

      Turn the ignition switch off.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F4-6 (CANH) - F4-14 (CANL) Ignition switch off 108 to 132 Ω

      Tech Tips

      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 BUS BRANCH WIRE OR CONNECTOR (DLC3 BRANCH WIRE)

    OK

  2. CHECK CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR)


    1. A01VLANE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-10 (CANH) - F83-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  3. CONNECT CONNECTOR


    1. Reconnect the F83 No. 2 junction connector.


    NEXT

  4. CHECK CAN MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY)

    A01VDXLE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Combination Meter Assembly)

    1. 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
      F1-32 (CANH) - F1-31 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

  5. CONNECT CONNECTOR


    1. Reconnect the F1 combination meter assembly connector.


    NEXT

  6. CHECK CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

    A01VGAAE02
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to No. 2 Junction Connector)

    1. Disconnect the No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F83-7 (CANH) - F83-18 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

  7. CONNECT CONNECTOR


    1. Reconnect the F83 No. 2 junction connector.


    NEXT

  8. CHECK CAN MAIN WIRE OR CONNECTOR (ECM)


    1. Disconnect the ECM connector.

    2. A01VE6AE02
      Text in Illustration
      *A for 1NR-FE
      *B for 1KR-FE
      *C for 1ND-TV
      *a

      Front view of wire harness connector

      (to ECM)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition

      A58-13 (CANH) - A58-26 (CANL)*1

      A93-26 (CANH) - A93-25 (CANL)*2

      A59-3 (CANH) - A59-4 (CANL)*3

      		 Ignition switch off 108 to 132 Ω

      *1: for 1NR-FE

      *2: for 1KR-FE

      *3: for 1ND-TV

      Result
      Result Proceed to
      NG A
      OK (for 1NR-FE) B
      OK (for 1KR-FE) C
      OK (for 1ND-TV) D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    A

  9. CONNECT CONNECTOR


    1. Reconnect the A58*1, A93*2 or A59*3 ECM connector.

      *1: for 1NR-FE

      *2: for 1KR-FE

      *3: for 1ND-TV


    NEXT

  10. CHECK CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - ECM)

    A01VF6VE02
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to No. 1 Junction Connector)

    1. Disconnect the A61 and F82 No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-9 (CANH) - A61-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (ECM - NO. 1 JUNCTION CONNECTOR)

    OK

  11. CHECK CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    A01VLDYE02
    Text in Illustration
    *a

    Rear view of wire harness connector

    (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F82-4 (CANH) - F82-15 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)