The fan control function - GF07.61-P-3023V

ENGINE 272.920 in MODEL 203

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203, 209

ENGINE 272.941 in MODEL 203

ENGINE 272.942 in MODEL 171

ENGINE 272.943 in MODEL 211

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251

ENGINE 272.946 in MODEL 221

ENGINE 272.960 in MODEL 203, 209

ENGINE 272.963 in MODEL 171

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221

ENGINE 272.966 in MODEL 230

ENGINE 272.967 in MODEL 164, 251

ENGINE 272.970 in MODEL 203

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221

ENGINE 273.922 in MODEL 221

ENGINE 273.923 in MODEL 164

ENGINE 273.924 in MODEL 221

ENGINE 273.943 in MODEL 164

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251

ENGINE 273.965 in MODEL 230

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221

Shown on engine 272.963 in model 171

Fig 1: Fan Control Function (Shown On Engine 272.963 In Model 171)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

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

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

The on/off ratio is 10 to 90%.

Meaning:

10% Electric suction fan OFF

20% Electric suction fan "ON", minimum speed

The status of the automatic air conditioning is transmitted from the instrument cluster via the CAN data bus to the ME-SFI [ME] control unit. The fan specified speed is dependent on this information and on the coolant temperature.

The suction fan 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 control unit exceeds specified maximum values.

If the battery voltage drops excessively during this operation, suction fan run-on is suppressed.

20% Electric suction fan "ON", minimum speed

90% Electric suction fan "ON", maximum speed.

If the actuation is faulty, the electric suction fan rotates with maximum rotational speed (fan emergency mode).

If the battery voltage drops excessively during this operation, suction fan run-on is suppressed.

	Component description for the ME-SFI [ME] control unit		GF07.61-P-6000V
	Component description for the crankshaft Hall sensor		GF07.04-P-6220V
	Component description for the coolant temperature sensor		GF07.04-P-6040V