Radiator Cooling Fan: Testing and Inspection

2AZ-FXE COOLING: COOLING FAN SYSTEM: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT COOLING FAN OPERATION AT LOW TEMPERATURES (Below 83°C (181°F))
(a) Set the vehicle to inspection mode. Component Tests and General Diagnostics
(b) Start the engine.
(c) 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.
(d) Disconnect the engine coolant temperature sensor connector.
(e) 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.
(f) Reconnect the engine coolant temperature sensor connector.
2. INSPECT COOLING FAN OPERATION AT HIGH TEMPERATURES (Above 93°C (199°F))
(a) Set the vehicle to 2WD inspection mode. Component Tests and General Diagnostics
(b) Start the engine, and raise the coolant temperature to above 93°C (199°F).
HINT: Coolant temperature is detected by the engine coolant temperature sensor on the water outlet.

(c) Check that the cooling fan rotates.
If not, replace the engine coolant temperature sensor.