COOLING FAN ECU ON-VEHICLE INSPECTION

  1. INSPECT COOLING FAN ECU

    1. Put the vehicle in the following conditions:

      1. The engine switch is off.

      2. The 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 over one of the two wires for the cooling fan motor.

    3. Turn the engine switch on (IG) and wait for approximately 10 seconds. Check that the fan stops.

    4. Start the engine. Check that the fan stops with the engine idling.

      Tech Tips

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

      • Turn the A/C switch off.

    5. Check that the fan operates when the A/C switch is turned on.

      Standard Current
      Item Specified Condition
      Cooling fan motor 14.2 to 20.2 A
      No. 2 cooling fan motor 7.5 to 11.5 A

      Tech Tips

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

    6. Check that the fan operates when the engine coolant temperature sensor connector is disconnected.

      Standard Current
      Item Specified Condition
      Cooling fan motor 14.2 to 20.2 A
      No. 2 cooling fan motor 7.5 to 11.5 A

    7. After the engine is warmed up, check that the fan operates as shown in the illustration.

      A011V70E12

      Tech Tips

      • The coolant temperature at which the fan starts operating is approximately 94°C (201°F).

      • This system can also be checked using the Techstream.

      • Select the following menu items: Powertrain / Engine / Data List / Coolant Temp.