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 "Bus Check".


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

  • Power source or inside ECM

  • Harness or connector

  • ECM

WIRING DIAGRAM

A005RQQE01
A005VNYE01

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. Disconnect the A40 and B39 ECM connectors.

      A005V9HE02

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

      Standard Resistance
      for 1AZ-FE
      Tester Connection Condition Specified Condition
      A40-32 (EC) - Body ground Always Below 1 Ω
      B39-43 (ME01) - Body ground Always Below 1 Ω
      B39-44 (E02) - Body ground Always Below 1 Ω
      B39-45 (E01) - Body ground Always Below 1 Ω
      B39-104 (E1) - Body ground Always Below 1 Ω
      except 1AZ-FE
      Tester Connection Condition Specified Condition
      A40-32 (EC) - Body ground Always Below 1 Ω
      B39-41 (E04) - Body ground Always Below 1 Ω
      B39-44 (ME01) - Body ground Always Below 1 Ω
      B39-45 (E02) - Body ground Always Below 1 Ω
      B39-46 (E01) - Body ground Always Below 1 Ω
      B39-81 (E03) - Body ground Always Below 1 Ω
      B39-105 (E1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for 1AZ-FE
      Tester Connection Condition Specified Condition
      A40-3 (+BM) - Body ground Always 11 to 14 V
      A40-20 (BATT) - Body ground Always 11 to 14 V
      A40-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A40-44 (MREL) 11 to 14 V
      except 1AZ-FE
      Tester Connection Condition Specified Condition
      A40-3 (+BM) - Body ground Always 11 to 14 V
      A40-20 (BATT) - 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 11 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)

      		 *3 except 1AZ-FE
      *2 for 1AZ-FE - -

      Tech Tips

      *: ECM replacement procedure:



    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM*