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

  • ECM

  • Combination meter assembly

  • DLC3 CAN branch wire or connector

WIRING DIAGRAM

A01IQ1YE01

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 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 (DLC3 CAN BRANCH WIRE)


    1. A01IOQSE33
      Text in Illustration
      *a Front view of DLC3

      Disconnect the H88 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
      H16-6 (CANH) - H16-14 (CANL) Ignition switch off 108 to 132 Ω

      Note

      When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 CAN branch wire. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area Click here.


    NG

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

    OK

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


    1. A01IP0PE01
      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
      H88-10 (CANH) - H88-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IP0PE02
      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
      H88-9 (CANH) - H88-20 (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 H88 No. 2 junction connector.


    NEXT

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


    1. A01IP0PE03
      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
      A50-10 (CANH) - A50-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01IP0PE04
      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
      A50-9 (CANH) - A50-20 (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 A50 No. 1 junction connector.


    NEXT

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


    1. A01IS06E01
      Text in Illustration
      *A for 1ZR-FAE, 2ZR-FAE
      *B for 1AD-FTV, 2AD-FHV
      *C for 1WW
      *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
      for 1ZR-FAE, 2ZR-FAE
      Tester Connection Switch Condition Specified Condition
      A51-8 (CANH) - A51-9 (CANL) Ignition switch off 108 to 132 Ω
      for 1AD-FTV, 2AD-FHV
      Tester Connection Switch Condition Specified Condition
      A51-7 (CANH) - A51-6 (CANL) Ignition switch off 108 to 132 Ω
      for 1WW
      Tester Connection Switch Condition Specified Condition
      A76-26 (CANH) - A76-25 (CANL) Ignition switch off 108 to 132 Ω

      Tech Tips

      *: Replacement procedure:



    NG

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

    OK

    REPLACE ECM*

  11. CONNECT CONNECTOR


    1. Reconnect the H88 No. 2 junction connector.


    NEXT

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


    1. A01IQXRE24
      Text in Illustration
      *a

      Front 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
      H62-22 (CANH) - H62-23 (CANL) Ignition switch off 108 to 132 Ω

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here