Radiator Cooling Fan Control Module: Testing and Inspection

2GR-FSE COOLING: COOLING FAN ECU: ON-VEHICLE INSPECTION

1. CHECK COOLING FAN ECU

(a) Check the input signal and output current.

HINT
Be sure to perform the inspection with the radiator coolant temperature less the an 82°C (180°F).





Set the oscilloscope probe to the terminal B3-2 (SI) of cooling fan ECU.

(1) Connect the Techstream to the DLC3.





Using the Techstream, check the waveform.

Standard waveform:





If the input signal is abnormal, there is a malfunction in the ECM or cooling fan ECU.

If the output current is abnormal even when the input signal is normal, there is a malfunction in the cooling fan ECU (SI) or motor.

(b) Check the cooling fan motor Testing and Inspection.

(c) Check the cooling fan motor operation.

(1) Disconnect the B3 cooling fan ECU connector.





Connect the battery to the cooling fan ECU of terminal 3 (+B1) and 1 (E1).

If they do not operation, replace the cooling fan ECU.