ЭБУ ВЕНТИЛЯТОРА СИСТЕМЫ ОХЛАЖДЕНИЯ > ПРОВЕРКА БЕЗ СНЯТИЯ С АВТОМОБИЛЯ

для подготовки Нажмите здесь



1. CHECK COOLING FAN ECU

  1. Remove the front controllers cover.



    A151123

  1. Using a screwdriver, detach the 2 claws and disconnect the front controller.

    УКАЗАНИЕ:
    Tape the screwdriver tip before use.



  1. Check the resistance of the wire harness between the front controller B14-22 (FAN1) and cooling fan ECU A9-2 (S1).


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    Standard resistance:
    Tester Connection
    		Specified Condition
    B14-22 (FAN1) - A9-2 (S1)
    		Below 1 Ω
    B14-22 (FAN1) - Body ground
    A9-2 (S1) - Body ground
    		10 kΩ or higher

    If the result is not as specified, repair or replace the wire harness or connector.



  1. Check the output signal from the front controller.

    УКАЗАНИЕ:
    Be sure to perform the inspection when the engine coolant temperature is less than 92°C (198°F).




    1. Set the oscilloscope probe to the terminal B14-22 (FAN1) of the front controller.


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    2. Connect the intelligent tester to the DLC3.



    3. Using the intelligent tester, check the waveform.

      УКАЗАНИЕ:
      Select the following menu items: Power train / Engine / Active Test / Cooling Fan.



      A148566E01


      Standard waveform:

      Condition
      		Input Signal
      Engine stopped
      (engine switch on (IG))
      		Waveform 1
      (Duty ratio 0%)
      Engine idling
      (A/C OFF)
      		Waveform 1
      (Duty ratio 0%)
      Engine idling
      (A/C ON)
      		Waveform 2
      (Duty ratio 50 to 70%)
      Engine idling
      (engine coolant temperature sensor connector disconnected)
      		Waveform 3
      (Duty ratio 60 to 70%)

      If the output signal is abnormal, there is a malfunction in the ECM or front controller.



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  1. Check the input voltage.

    1. Disconnect the cooling fan ECU connector.

    2. Turn the engine switch on (IG). Check the voltage of the A9-3 (+B1) terminal on the wire harness side.

      Standard voltage:
      11 to 14 V

      If the result is not as specified, check the power source system (H-fuse, fuse, wire harness and relay).

    3. Connect the cooling fan ECU connector.

  1. Check wire harness (Cooling fan ECU and body ground).

    1. Disconnect the cooling fan ECU connector.

    2. Measure the resistance of the A9-1 (E1) and body ground.

      Standard resistance:
      Below 1 Ω

      If the result is not as specified, check the wire harness or connector.

    3. Connect the cooling fan ECU connector.

  1. Check the cooling fan motor (see page Нажмите здесь).
    If the result is not as specified, replace the cooling fan motor.



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  1. Check the cooling fan motor operation.

    1. Disconnect the cooling fan ECU connector.

    2. Connect the battery to the cooling fan ECU at terminals 3 (+B1) and 1 (E1).

    3. Check that the cooling fan motor rotates.
      If it does not operate, replace the cooling fan ECU.