COOLING FAN ECU ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT COOLING FAN ECU


    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 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 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. B003U8BC01
      *a Code Mark

      Check the code mark on the cooling fan motor.

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

      Standard Current
      Item Code Mark / Motor Type Condition Specified Condition
      Cooling fan motor S Battery voltage applied at 20°C (68°F) 7.8 to 13.8 A
      M 13.0 to 19.0 A
      No. 2 cooling fan motor for 100 W Type 7.8 to 13.8 A
      for 200 W Type 13.0 to 19.0 A

      Tech Tips

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

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

      Standard Current
      Item Code Mark / Motor Type Condition Specified Condition
      Cooling fan motor S Battery voltage applied at 20°C (68°F) 7.8 to 13.8 A
      M 13.0 to 19.0 A
      No. 2 cooling fan motor for 100 W Type 7.8 to 13.8 A
      for 200 W Type 13.0 to 19.0 A
    8. B003WIZC02
      *a Operating Diagram
      *b A/C OFF
      *c MAX HI
      *d HI
      *e LO
      *f MAX LO
      *g 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