CAN COMMUNICATION SYSTEM (for LHD without Entry and Start System) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

Either condition is met:


  • "ECM (Engine)" is not displayed on "Bus Check".


  • "ECM Communication Stop Mode" in "DTC Combination Table" applies.

  • Power source or inside ECM

  • ECM

WIRING DIAGRAM

A01DP2DE01
A01DP2DE03
A01DQ5VE02

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. for 1GR-FE:


      1. Disconnect the C36, C37 and G55 ECM connectors.

        A01DR15E04
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C36-12 (E1) - Body ground Always Below 1 Ω
        C37-14 (E01) - Body ground Always Below 1 Ω
        C37-15 (E02) - Body ground Always Below 1 Ω
        C37-10 (ME01) - Body ground Always Below 1 Ω
        G55-12 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G55-24 (BATT) - Body ground Always 11 to 14 V
        G55-23 (+B2) - Body ground Battery positive (+) voltage applied to terminal G55-9 (MREL) 11 to 14 V
        G55-22 (+B) - Body ground Battery positive (+) voltage applied to terminal G55-9 (MREL) 11 to 14 V

    2. for 1KD-FTV:


      1. Disconnect the C93, G57 and G58 ECM connectors.

        A01DOJ4E01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C93-1 (E1) - Body ground Always Below 1 Ω
        C93-12 (E01) - Body ground Always Below 1 Ω
        C93-13 (E02) - Body ground Always Below 1 Ω
        C93-8 (ME01) - Body ground Always Below 1 Ω
        G57-11 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G57-23 (BATT) - Body ground Always 11 to 14 V
        G57-17 (+B2) - Body ground Battery positive (+) voltage applied to terminal G58-11 (MREL) 11 to 14 V
        G57-24 (+B) - Body ground Battery positive (+) voltage applied to terminal G58-11 (MREL) 11 to 14 V

    3. for 2TR-FE:


      1. Disconnect the G59, G60 and C64 ECM connectors.

        A01DOJ4E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C64-5 (E1) - Body ground Always Below 1 Ω
        C64-11 (E01) - Body ground Always Below 1 Ω
        C64-12 (E02) - Body ground Always Below 1 Ω
        C64-13 (ME01) - Body ground Always Below 1 Ω
        G59-11 (EC) - Body ground Always Below 1 Ω

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        G59-17 (BATT) - Body ground Always 11 to 14 V
        G59-23 (+B) - Body ground Battery positive (+) voltage applied to terminal G60-12 (MREL) 11 to 14 V
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1KD-FTV) B
      OK (for 2TR-FE) C
      NG D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here