GF07.61-P-3023KE Fan Control, Function

GF07.61-P-3023KE Fan Control, Function
- up to model year 08

Component Identification:

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 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.