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 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

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • No. 4 junction connector

  • No. 5 junction connector

  • ECM

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A01CHMTE03

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. 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 airbag 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. 2 JUNCTION CONNECTOR - DLC3)


    1. A01CGV9E56
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      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
      J72-4 (CANH) - D34-6 (CANH) Ignition switch off Below 1 Ω
      J72-15 (CANL) - D34-14 (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. 2 JUNCTION CONNECTOR - ECM)


    1. A01CGO1E53
      Text in Illustration
      *a

      Rear 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
      J72-6 (CANH) - J72-17 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

  5. CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    1. A01CGO1E54
      Text in Illustration
      *a

      Rear 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
      J72-5 (CANH) - J72-16 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  6. CONNECT CONNECTOR


    1. Reconnect the J72 No. 2 junction connector.


    NEXT

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


    1. A01CGO1E55
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      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
      J76-6 (CANH) - J76-17 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01CGO1E56
      Text in Illustration
      *a

      Rear 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
      J76-5 (CANH) - J76-16 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  9. CONNECT CONNECTOR


    1. Reconnect the J76 No. 1 junction connector.


    NEXT

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


    1. A01CH7UE08
      Text in Illustration
      *a

      Rear 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
      E40-7 (CANH) - E40-1 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE ECM Click here

  11. CONNECT CONNECTOR


    1. Reconnect the J72 No. 2 junction connector.


    NEXT

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


    1. A01CGO1E57
      Text in Illustration
      *a

      Rear 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
      J82-8 (CANH) - J82-19 (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 - NO. 5 JUNCTION CONNECTOR)


    1. A01CGO1E58
      Text in Illustration
      *a

      Rear 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
      J82-9 (CANH) - J82-20 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  14. CONNECT CONNECTOR


    1. Reconnect the J82 No. 3 junction connector.


    NEXT

  15. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    1. A01CIQSE37
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Connector)

      Disconnect the No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J56-3 (CANH) - J56-8 (CANL) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

    OK

  16. CHECK FOR OPEN IN CAN BUS WIRE (NO. 4 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    1. A01CIQSE36
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J56-5 (CANH) - J56-10 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 4 JUNCTION CONNECTOR

  17. CONNECT CONNECTOR


    1. Reconnect the J56 No. 4 junction connector.


    NEXT

  18. CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)


    1. A01CHJZE07
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 5 Junction Connector)

      Disconnect the No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J84-1 (CA1H) - J84-2 (CA1L) Ignition switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

    REPLACE NO. 5 JUNCTION CONNECTOR