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

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8 

Shown on engine 272.963 in model 171 

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

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

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

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

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