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

A01IT5YE03
A01IQAOE01

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)

    A01IUOXE03
    Text in Illustration
    *1 for AD Series Engine *2 for ZR Series Engine
    *3

    Front view of wire harness connector

    (to ECM)

    		 - -

    1. Disconnect the A51 and C69*1 or C68*2 ECM connectors.


      • *1: for AD Series Engine

      • *2: for ZR Series Engine

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

      Standard Resistance
      for AD Series Engine
      Tester Connection Condition Specified Condition
      C69-44 (E02) - Body ground Always Below 1 Ω
      C69-45 (E01) - Body ground Always Below 1 Ω
      C69-46 (E05) - Body ground Always Below 1 Ω
      C69-84 (ME01) - Body ground Always Below 1 Ω
      C69-109 (E1) - Body ground Always Below 1 Ω
      for ZR Series Engine
      Tester Connection Condition Specified Condition
      A51-32 (EC) - Body ground Always Below 1 Ω
      C68-41 (E04) - Body ground Always Below 1 Ω
      C68-44 (ME01) - Body ground Always Below 1 Ω
      C68-45 (E02) - Body ground Always Below 1 Ω
      C68-46 (E01) - Body ground Always Below 1 Ω
      C68-81 (E03) - Body ground Always Below 1 Ω
      C68-105 (E1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      for AD Series Engine
      Tester Connection Switch Condition Specified Condition
      A51-2 (BATT) - Body ground Always 11 to 14 V
      A51-20 (+B2) - Body ground Always 11 to 14 V
      A51-1 (+B) - Body ground Battery positive (+) voltage applied to terminal A51-45 (MREL) 11 to 14 V
      for ZR Series Engine
      Tester Connection Switch Condition Specified Condition
      A51-3 (+BM) - Body ground Always 11 to 14 V
      A51-20 (BATT) - Body ground Always 11 to 14 V
      A51-1 (+B2) - Body ground Battery positive (+) voltage applied to terminal A51-44 (MREL) 11 to 14 V
      A51-2 (+B) - Body ground Battery positive (+) voltage applied to terminal A51-44 (MREL) 11 to 14 V
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FHV) B
      OK (for 1ZR-FAE) C
      OK (for 2ZR-FAE) D
      NG E

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here