Fan control, function - GF07.61-P-3023CY

ENGINE 272.911 in MODEL 204.0 up to Model Year 08 

ENGINE 272.921 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.947 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.948 in MODEL 204.0 up to Model Year 08 

ENGINE 272.961 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.971 in MODEL 204.0 up to Model Year 08 

The ME-SFI [ME] control unit (N3/10) indirectly actuates the combustion engine and air conditioning with integrated control fan motor (M4/7).

The fan specified speed is transmitted by the ME-SFI [ME] control unit via a pulse width modulated signal (PWM signal). The duty cycle of the PWM signal is 10 to 90 %.

Meaning: 

10% Fan motor "OFF"

20% Fan motor "ON", minimum rotational speed

90% Fan motor "ON", maximum rotational speed

If the actuation is faulty, the fan motor rotates at maximum rotational speed (fan emergency mode).

The automatic air conditioning control and operating unit (N22/7) transmits the status of the automatic air conditioning to the ME-SFI [ME] control unit via the interior CAN (CAN B) and chassis CAN (CAN E). The fan specified speed is dependent on this and on the coolant temperature.

The fan motor continues running for up to 5 minutes after ignition "OFF" if the coolant temperature, the engine oil temperature (from the temperature model) or the temperature of the ME-SFI [ME] control unit exceeds specified maximum values.

If the battery voltage drops excessively during this operation, engine-off running is suppressed.

	Electrical function diagram, fan control for engine and air conditioning		PE07.61-P-2765-99FAB
	Component description for the crankshaft Hall sensor	B70	GF07.04-P-6221CY
	Component description for the coolant temperature sensor	B11/4	GF07.04-P-6043CY
	Component description for the ME-SFI [ME] control unit	N3/10	GF07.61-P-6000CY