Fan Control Module Inspection

Connect the M-MDS to the DLC-2.
Start and warm up the engine.
Monitor the engine coolant temperature with the M-MDS.

Gradually increase the FAN_DUTY value from 0 to the maximum possible M-MDS operation value using the simulation function. (See ON-BOARD DIAGNOSTIC TEST .)

Visually verify that the operation speed of the cooling fan conforms to the override drive.
To start the cooling fan from the stopped condition, approx. 5 s. are needed for start-up preparations before starting the cooling fan.
Using the M-MDS, change the operation condition of the A/C while measuring the engine coolant temperature under the following conditions, and verify that the cooling fan operates correctly.
Because there is an intake air temperature decrease control setting, the cooling fan may operate when IAT sensor No. 1 detects 60°C {140°F} or more according to conditions other than those mentioned.
Because there is an engine protection control setting, the cooling fan may operate when IAT sensor No. 2 detects 70°C {158°F} or more according to conditions other than those mentioned.

Engine coolant temperature °C {°F}	A/C operation status	Cooling fan operation status
less than 98 {208}	Off	Off
less than 98 {208}	On	On
more than 100 {212}	Off	On

If normal operation cannot be verified in Steps 4 and 5, inspect the input signals of the following parts.
Replace the cooling fan motor if all the following parts are normal.
- ECT sensor
- Refrigerant pressure sensor