CAN COMMUNICATION 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

A01IROHE01
A01ISUOE01

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 1ZR-FAE, 2ZR-FAE:

      A01ISV3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

      1. Disconnect the ECM connectors.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A76-32 (EC) - Body ground Always Below 1 Ω
        C111-26 (E04) - Body ground Always Below 1 Ω
        C111-28 (ME01) - Body ground Always Below 1 Ω
        C111-57 (E01) - Body ground Always Below 1 Ω
        C111-58 (E02) - Body ground Always Below 1 Ω
        C111-59 (E1) - 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
        C111-29 (+BM) - Body ground Always 11 to 14 V
        A76-1 (BATT) - Body ground Always 11 to 14 V
        A76-3 (+B2) - Body ground Battery positive (+) voltage applied to terminal A76-46 (MREL) 11 to 14 V
        A76-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A76-46 (MREL) 11 to 14 V

    2. for 1WW:


      1. A01IUF2E02
        Text in Illustration
        *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
        Tester Connection Condition Specified Condition
        A76-4 (E1) - Body ground Always Below 1 Ω
        A76-5 (E2) - Body ground Always Below 1 Ω
        A76-17 (E3) - Body ground Always Below 1 Ω
        A76-18 (E4) - 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
        A76-15 (BATT) - Body ground Always 11 to 14 V
        A76-1 (+B3) - Body ground Battery positive (+) voltage applied to terminal A76-9 (MREL) 11 to 14 V
        A76-14 (+B2) - Body ground Battery positive (+) voltage applied to terminal A76-9 (MREL) 11 to 14 V
        A76-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A76-9 (MREL) 11 to 14 V

      Tech Tips

      *: Replacement procedure:

      for 1ZR-FAE Click here

      for 2ZR-FAE Click here

      for 1WW Click here


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM*