COOLING FAN ECU ON-VEHICLE INSPECTION

PROCEDURE


  1. CHECK COOLING FAN SYSTEM


    1. Check and ensure the following conditions:


      1. The ignition 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 one of the 2 wires for the cooling fan motor.

    3. Turn the ignition switch to ON and wait for approximately 10 seconds. Check that the fan is not operating.

    4. Start the engine. Check that the fan is 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 fan operates when the A/C switch is turned on.

    6. Measure the current while the cooling fan motor is turning.

      Standard Current
      Item Condition Specified Condition
      Cooling fan motor Battery voltage applied at 20°C (68°F) 13.6 to 19.6 A
      No. 2 cooling fan motor 13.6 to 19.6 A

      Tech Tips

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

    7. Check that the fan operates when the water temperature sensor connector is disconnected.

    8. Measure the current while the cooling fan motor is turning.

      Standard Current
      Item Condition Specified Condition
      Cooling fan motor Battery voltage applied at 20°C (68°F) 13.6 to 19.6 A
      No. 2 cooling fan motor 13.6 to 19.6 A
    9. A018I1ZC01
      *a Operating Diagram
      *b MAX HI
      *c HI
      *d LO
      *e OFF
      *f Fan Speed

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

      Tech Tips


      • The engine coolant temperature at which the fan starts 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 Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp