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Fan Control

The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure, etc.) to determine engine cooling fan needs.

For Variable Speed Electric Fan(s):  The PCM controls the fan speed and operation using a duty cycle output on the Fan Control - Variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor). See Fig 1.

Fig 1: Identifying FCV Command States
G00191018Courtesy of FORD MOTOR CO.

For Relay Controlled Fans:  The PCM controls the fan operation through the Fan Control (FC) (single speed fan applications), Low Fan Control (LFC), Medium Fan Control (MFC) and/or High Fan Control (HFC) outputs. For three speed fans, although the PCM output circuits are called low, medium and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. See Fig 2.

Fig 2: Identifying Cooling Fan Speed Output States
G00191019Courtesy of FORD MOTOR CO.
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