CAN COMMUNICATION SYSTEM Open in CAN Main Wire

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 69 Ω or higher.

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

  • CAN main wire and connector

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • ECM

  • Combination meter assembly

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A004RQ7E02
*a No. 2 Junction Connector
*b No. 1 Junction Connector
*c No. 3 Junction Connector
*d Combination Meter Assembly

CAUTION / NOTICE / HINT

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. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. 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:

      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

  3. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - DLC3)


    1. A004QEIE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

      Disconnect the 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
      D151-1 (CANH) - D8-6 (CANH) Ignition switch off Below 1 Ω
      D151-2 (CANL) - D8-14 (CANL) Ignition switch off Below 1 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

  4. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)


    1. Disconnect the No. 1 junction connector.

    2. A004T70E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D147-1 (CANH) - D147-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. Disconnect the No. 1 junction connector.

    2. A004U5VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D154-1 (CANH) - D154-2 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  6. CONNECT CONNECTOR


    1. Reconnect the No. 1 junction connector.


    NEXT

  7. CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 1 JUNCTION CONNECTOR)


    1. A004MKME02
      Text in Illustration
      *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
      Tester Connection Switch Condition Specified Condition
      A83-26 (CANH) - A83-25 (CANL) Ignition switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1WW) A
      OK (for 2WW) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

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

  8. CONNECT CONNECTOR


    1. Reconnect the No. 1 junction connector.


    NEXT

  9. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    1. A004PEEE02
      Text in Illustration
      *a

      Front 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
      G72-1 (CANH) - G72-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

  10. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. Disconnect the No. 2 junction connector.

    2. A004OR9E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G71-1 (CANH) - G71-2 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

  11. CONNECT CONNECTOR


    1. Reconnect the No. 2 junction connector.


    NEXT

  12. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A004P4BE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Connector)

      Disconnect the No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D164-1 (CANH) - D164-2 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    OK

  13. CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. Disconnect the No. 3 junction connector.

    2. A004T35E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D161-1 (CANH) - D161-2 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

    NG

  14. CONNECT CONNECTOR


    1. Reconnect the No. 3 junction connector.


    NEXT

  15. CHECK FOR OPEN IN CAN BUS WIRE (COMBINATION METER ASSEMBLY - NO. 3 JUNCTION CONNECTOR)


    1. A004OW3E02
      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
      D66-32 (CANH) - D66-31 (CANL) Ignition switch off 108 to 132 Ω

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 JUNCTION CONNECTOR)