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 the "Bus Check" screen.

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

  • Power source or inside of ECM

  • ECM

WIRING DIAGRAM

A004T92E03

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. Disconnect the A40 and B39 ECM connectors.

      A004RU9E02
      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
      A40-2 (BATT) - Body ground Always 11 to 14 V
      A40-1 (+B) - Body ground Battery positive (+) voltage applied to terminal A40-45 (MREL) 11 to 14 V
      A40-20 (+B2) - Body ground Battery positive (+) voltage applied to terminal A40-45 (MREL) 11 to 14 V
      A40-25 (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
      B39-45 (E01) - Body ground Always Below 1 Ω
      B39-84 (ME01) - Body ground Always Below 1 Ω
      B39-109 (E1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FTV) B
      OK (for 2AD-FHV) C
      NG D

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR