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

ENGINE 156.982 in MODEL 209 

ENGINE 156.983 in MODEL 211, 219 

ENGINE 156.984 in MODEL 216, 221 

The ME-SFI [ME] control unit indirectly actuates the electric suction fan engine and AC continuously.

The fan specified speed is transmitted by the ME-SFI [ME] control unit via a PWM signal (pulse width modulated signal).

The duty cycle of the PWM signal is 10 to 90 %.

Meaning:

10% Electric suction fan "OFF"

20% Electric suction fan "ON", minimum speed

90% Electric suction fan "ON", maximum speed

The AAC [KLA] control unit transmits the status of the automatic air conditioning via the CAN data bus to the ME-SFI [ME] control unit. The fan specified speed is dependent on this and on the coolant temperature.

The engine and AC electric suction fan runs on for up to 5 minutes at "Ignition OFF" if the coolant temperature, the engine oil temperature 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.

Fan emergency operation 

If actuation is faulty, the engine and AC electric suction fan runs at maximum RPM.

	Component description for the coolant temperature sensor	B11/4	GF07.04-P-6040AMG
	Component description for the crankshaft Hall sensor	B70	GF07.04-P-6220AMG
	Component description for the ME-SFI [ME] control unit	N3/10	GF07.61-P-6000AMG