Radiator Cooling Fan Control Module: Testing and Inspection

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

1. INSPECT COOLING FAN ECU

(a) Put the vehicle in the following conditions:

(1) The power switch is off.

(2) The coolant temperature is less than 92°C (198°F).

(3) The battery voltage is between 9 and 14 V.

(4) The A/C switch is off.

(b) Clamp the 400 A probe of an ammeter over the M+ wire of each cooling fan motor.

(c) Turn the power switch on (IG) and wait for approximately 10 seconds. Check that the fans stop.

(d) Start the engine. Check that the fans are stopped with the engine idling.

HINT
* Make sure that the engine coolant temperature is less than 92°C (198°F).
* Make sure that the A/C switch is off.

(e) Check that the fans operate when the A/C switch is turned on.

Standard Current:





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

(f) Check that the fans operate when the engine coolant temperature sensor connector is disconnected.

Standard Current:





(g) After the engine is warmed up, check that the fans operate as shown in the illustration.





HINT
* The coolant temperature at which the fans start operating is approximately 94°C (201°F).
* This system can also be checked using the Techstream.
* Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.