Mazda CX-5 Service & Repair Manual: Electrical Fan Control

Outline

• Through cooling of the radiator and condenser by operation of the cooling fan according to vehicle conditions, engine reliability and cooling performance have been improved.

Block Diagram

Operation

• The PCM determines the demand airflow volume by the following conditions.

Engine coolant temperature condition

• Controls the PCM output duty ratio according to the engine coolant temperature.

• The control temperature while the engine coolant temperature is decreasing is controlled differently than when it is increasing.

A/C operation condition

• Controls the demand airflow volume depending on the refrigerant pressure and vehicle speed when the A/C switch is on.

After Cooling Control

• If the ignition is switched off directly after continuous high engine-load travel, the PCM operates (demand airflow volume: low) the cooling fan for a maximum of 9 minutes when all of the following conditions are met due to the possibility that the engine may not restart as a result of a fuel supply malfunction caused by the high temperature.

• Engine coolant temperature: 90°C {194 °F} or more

• Accumulated amount of engine heat is extremely large

• Driving record for vehicle speed of 25 km/h {16 mph} or more available