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

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DTC Code DTC Name
  Main Body ECU Communication Stop Mode
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DESCRIPTION

Detection Item Symptom Trouble Area
Main Body ECU Communication Stop Mode

Either condition is met:


  • "Main Body" is not displayed on the "Bus Check" screen.

  • "Main Body ECU Communication Stop Mode" in "DTC Communication Table" applies.

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

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

  • Main body ECU (cowl side junction block LH)
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tip:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

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PROCEDURE


  1. Click here

    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).


  2. Click here

    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:

      For vehicle with an SRS system:

      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).


  3. Click here

    CHECK FOR OPEN IN CAN BUS WIRE (MAIN BODY ECU CAN BRANCH WIRE)


    1. A015AMVE04

      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) Ignition switch off 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Rear view of wire harness connector

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

  4. Click here

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


    1. A0157TWE01

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

      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

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

      		 *b

      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 E3, 2A and 2D 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

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

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)