CAN COMMUNICATION SYSTEM ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

Either condition is met:


  • "Engine" is not displayed on the "Bus Check" screen.


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

  • Power source or inside of ECM

  • ECM

WIRING DIAGRAM

A0055PNE02
A0056UTE02

CAUTION / NOTICE / HINT

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 3ZR-FE:


      1. Disconnect the ECM connectors.

        A0058VFE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        A40-20 (BATT) - Body ground Always 11 to 14 V
        A40-3 (+BM) - Body ground Always 11 to 14 V
        A40-1 (+B2) - Body ground Battery positive (+) voltage applied to terminal A40-44 (MREL) 11 to 14 V
        A40-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A40-44 (MREL) 11 to 14 V
        A40-27 (IGSW) - Body ground Ignition switch ON 11 to 14 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A40-32 (EC) - Body ground Always Below 1 Ω
        B39-105 (E1) - Body ground Always Below 1 Ω
        B39-44 (ME01) - Body ground Always Below 1 Ω
        B39-46 (E01) - Body ground Always Below 1 Ω
        B39-81 (E03) - Body ground Always Below 1 Ω

    2. except 3ZR-FE:


      1. Disconnect the ECM connectors.

        A0058R7E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to ECM)

        		 - -

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        A67-1 (BATT) - Body ground Always 11 to 14 V
        B53-29 (+BM) - Body ground Always 11 to 14 V
        A67-3 (+B2) - Body ground Battery positive (+) voltage applied to terminal A67-46 (MREL) 11 to 14 V
        A67-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A67-46 (MREL) 11 to 14 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A67-32 (EC) - Body ground Always Below 1 Ω
        B53-59 (E1) - Body ground Always Below 1 Ω
        B53-28 (ME01) - Body ground Always Below 1 Ω
        B53-57 (E01) - Body ground Always Below 1 Ω
        Result
        Result Proceed to
        OK (for 1ZR-FAE) A
        OK (for 2ZR-FAE) B
        OK (for 3ZR-FAE) C
        OK (for 3ZR-FE) D
        NG E

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPAIR OR REPLACE HARNESS OR CONNECTOR