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

ENGINE 271.921 in MODEL 203 

ENGINE 271.940 in MODEL 203, 209 

ENGINE 271.941 in MODEL 211 

ENGINE 271.944 in MODEL 171 

ENGINE 271.946 in MODEL 203 

ENGINE 271.948 in MODEL 203 

ENGINE 271.955 in MODEL 209 

ENGINE 271.956 in MODEL 211 

The ME control unit indirectly actuates the electric suction fan engine and AC continuously.

The fan specified speed is transmitted by the ME control unit via a pulse width modulated signal (PWM 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 control and operating unit transmits the status of the automatic air conditioning via the CAN data bus to the ME control unit. The fan specified speed is dependent on this and on the coolant temperature.

Data exchange between CAN-B and CAN-C takes place via:

• EIS [EZS] control unit for model 203 except 04/04 up to 11/04, model 209
• Central gateway control unit for model 171, model 203 from 04/04 up to 11/04, model 211

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 (up to 05/2005) or the temperature of the ME control unit exceeds the specified maximum values.

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

Model 211 

If an SBC undervoltage exists, the fan speed is limited and the fault code is stored in the ME control unit.

	Component description for the crankshaft position sensor	L5		GF07.04-P-6010KE
	Component description for the coolant temperature sensor	B11/4		GF07.04-P-6040KE
	Component description for the ME-SFI [ME] control unit	N3/10		GF07.61-P-6000KE
	Component description for the oil sensor	B40	Up to 05/2005	GF18.40-P-2000KE