COOLING FAN ECU ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT COOLING FAN ECU


    1. for Cooling Fan Motor 240 W + 240 W Type:


      1. Check and ensure the following conditions:


        1. The engine switch is off.

        2. The engine coolant temperature is less than 92°C (198°F).

        3. The battery voltage is between 11 to 14 V.

        4. The A/C switch is off.

      2. Connect the pickup of a clamp-on ammeter around 1 of the 2 wires for the cooling fan motor.

      3. Turn the engine switch on (IG) and wait for approximately 10 seconds. Check that the cooling fans are not operating.

      4. Start the engine. Check that the cooling fans are not operating with the engine idling.

        Tech Tips


        • Make sure that the engine coolant temperature is less than 92°C (198°F).


        • Turn the A/C switch off.

      5. Check that the cooling fans operate when the A/C switch is turned on.

      6. Measure the current while the cooling fan motors are turning.

        Standard Current
        Item Condition Specified Condition
        Cooling fan motor Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
        No. 2 cooling fan motor 15.0 to 21.0 A

        Tech Tips

        The engine coolant temperature should be less than 92°C (198°F).

      7. Check that the cooling fans operate when the engine coolant temperature sensor connector is disconnected.

      8. Measure the current while the cooling fan motors are turning.

        Standard Current
        Item Condition Specified Condition
        Cooling fan motor Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
        No. 2 cooling fan motor 15.0 to 21.0 A
      9. B0075LSC12
        *a Operating Diagram
        *b MAX HI
        *c HI
        *d LO
        *e MAX LO
        *f Fan Speed

        After the engine is warmed up, check that the cooling fans operate as shown in the illustration.

        Tech Tips


        • The engine coolant temperature at which the fans start operating is approximately 94°C (201°F).

        • This system can also be checked using the GTS.

        • Enter the following menus: Powertrain / Engine / Data List / Coolant Tempemperature.


        Powertrain > Engine > Data List
        Tester Display
        Coolant Temperature