Cooling Fan System (For Hatchback) On-Vehicle Inspection

Engine Hybrid System. Yaris. Ncp93, 131
1Nz-Fe Cooling. Yaris. Ncp93, 131

  1. INSPECT COOLING FAN OPERATION AT LOW TEMPERATURES (Below 83°C (181°F))

  2. INSPECT COOLING FAN OPERATION AT HIGH TEMPERATURES (Above 96°C (205°F))

Cooling Fan System (For Hatchback) -- On-Vehicle Inspection


CAUTION:
Be sure that the ignition is off if you work near the electric cooling fans or radiator grille. With the ignition ON, the electric cooling fans may automatically start to run if the engine coolant temperature is high and/or the air conditioning is on.


1. INSPECT COOLING FAN OPERATION AT LOW TEMPERATURES (Below 83°C (181°F))

  1. Turn the ignition switch to ON.

  1. Check that the cooling fan stops.
    If not, check the cooling fan relay and engine coolant temperature sensor, and check whether there is disconnection or an open circuit between them.



    Yaris. Ncp93, 131

  1. Disconnect the engine coolant temperature sensor connector.

  1. Check that the cooling fan rotates.
    If not, check the fuses, cooling fan relay, ECM and cooling fan, and check for a short circuit between the cooing fan relay and engine coolant temperature sensor.

  1. Reconnect the engine coolant temperature sensor connector.



2. INSPECT COOLING FAN OPERATION AT HIGH TEMPERATURES (Above 96°C (205°F))

  1. Start the engine and turn the air conditioning switch off, and raise the engine coolant temperature to above 96°C (205°F).

    HINT:
    Engine coolant temperature is detected by the engine coolant temperature sensor on the water outlet.

  1. Check that the cooling fan rotates.
    If not, replace the engine coolant temperature sensor.