COOLING FAN ECU ON-VEHICLE INSPECTION

PROCEDURE


  1. CHECK COOLING FAN SYSTEM

    CAUTION:

    To prevent injury due to contact with an operating cooling fan, keep your hands and clothing away from the cooling fans when inspecting the cooling fan system.

    A01RCOQ

    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 either 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 operating.

      Standard Current
      Item Condition Specified Condition
      Cooling fan motor LH Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
      Cooling fan motor RH 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 operating.

      Standard Current
      Item Condition Specified Condition
      Cooling fan motor LH Battery voltage applied at 20°C (68°F) 15.0 to 21.0 A
      Cooling fan motor RH 15.0 to 21.0 A
    9. A01RCKMC09
      *a Operating Diagram
      *b MAX HI
      *c HI
      *d LO
      *e OFF
      *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 cooling 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 Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp