CAN COMMUNICATION SYSTEM (for RHD) Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Main Body ECU Communication Stop Mode

When either condition below is met:


  • "Main Body" is not displayed on "CAN Bus Check".

  • Applies to "Main Body ECU Communication Stop Mode" in "DTC Combination Table"

  • Power source or inside main body ECU (cowl side junction block LH)

  • Main body ECU (cowl side junction block LH) branch wire or connector

  • Main body ECU (cowl side junction block LH)

WIRING DIAGRAM

A01EN5QE09

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following 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 (MAIN BODY ECU CAN BRANCH WIRE)


    1. A01EPRFE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Main Body ECU [Cowl Side Junction Block LH])

      Disconnect the E3 main body ECU (cowl side junction block LH) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E3-5 (CANH) - E3-6 (CANL) Engine switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE MAIN BODY ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      A01ENCXE03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU [Cowl Side Junction Block LH])

      		 *2

      Rear view of wire harness connector

      (to Main Body ECU [Cowl Side Junction Block LH])

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

    2. Disconnect the 2A, 2D and E3 main body ECU (cowl side junction block LH) connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2A-1 (ALTB) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2D-62 (GND2) - Body ground Always Below 1 Ω
      E3-1 (GND3) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)