COOLING FAN ECU ON-VEHICLE INSPECTION


  1. INSPECT COOLING FAN ECU


    1. Put the vehicle in the following conditions:


      1. Turn the power switch off.

      2. The coolant temperature is less than 95°C (203°F).

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

      4. The A/C switch is off.

    2. Clamp the 400 A probe of an ammeter over the M+ wire of each cooling fan motor.

    3. Turn the power switch on (IG) and wait for approximately 10 seconds. Check that the fans stop.

    4. Start the engine. Check that the fans are stopped with the engine idling.

      Tech Tips


      • Make sure that the radiator engine coolant temperature is less than 95°C (203°F).

      • Make sure that the A/C switch is off.

    5. Check that the fans operate when the A/C switch is turned on (maximum cool).

      Standard Current
      Item Specified Condition
      Cooling fan motor 4 to 20 A
      No. 2 cooling fan motor 4 to 20 A

      Tech Tips

      The coolant temperature is less than 95°C (203°F).

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

      Standard Current
      Item Specified Condition
      Cooling fan motor 4 to 20 A
      No. 2 cooling fan motor 4 to 20 A
    7. A01NCQDE09

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

      Tech Tips


      • The coolant temperature at which the fans start operating is approximately 97°C (207°F).


      • This system can also be checked using the intelligent tester.


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