CAN COMMUNICATION SYSTEM (for RHD) 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.

Symptom 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

A01ENDBE06

INSPECTION PROCEDURE

Tech Tips

Operating the engine 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 engine 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. 3 JUNCTION CONNECTOR - DLC3)


    1. A01ER7DE04
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E22-6 (CANH) - E22-14 (CANL) Engine switch off 108 to 132 Ω

      Note

      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
    OK
  4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM)


    1. A01EOQOE16
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

      Disconnect the E69 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
      E69-4 (CANH) - E69-15 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK
  5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A01EOQOE15
      Text in Illustration
      *1

      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
      E69-1 (CANH) - E69-12 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK
  6. CONNECT CONNECTOR


    1. Reconnect the E69 No. 2 junction connector.


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


    1. A01EOQOE17
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

      Disconnect the E72 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
      E72-2 (CANH) - E72-13 (CANL) Engine switch off 108 to 132 Ω

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

    A01EOQOE18
    Text in Illustration
    *1

    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
      E72-1 (CANH) - E72-12 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK
  9. CONNECT CONNECTOR


    1. Reconnect the E72 No. 1 junction connector.


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


    1. A01ERW5E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      Disconnect the A53 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A53-10 (CANH) - A53-11 (CANL) Engine switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for 1UR-FE) A
      OK (for 3UR-FE) B
      NG C

    B
    C
    A
  11. CONNECT CONNECTOR


    1. Reconnect the E69 No. 2 junction connector.


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


    1. A01EOQOE19
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      Disconnect the E75 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
      E75-3 (CANH) - E75-14 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK
  13. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A01EOQOE20
      Text in Illustration
      *1

      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
      E75-1 (CANH) - E75-12 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK
  14. CONNECT CONNECTOR


    1. Reconnect the E75 No. 3 junction connector.


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


    1. A01ESILE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the E77 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
      E77-36 (CANH) - E77-35 (CANL) Engine switch off 108 to 132 Ω

    NG
    OK