Electric Fan (DME MS43)
Specified values, pressure sensorData on working ranges and substitute values.
The pressure sensor receives a 5 volt power supply from the control unit for the heating/air-conditioning system. The sensor signal is evaluated with the help of tables and forwarded to the engine electronic via the K bus. In the process, the refrigerant pressure in the air-conditioning
circuit is converted to a load torque and the required fan stage.
Refrigerant pressure-fan stage conversion table
Each fan stage that is determined is transmitted via a telegram from the engine electronics. Prerequisite is a speed less than 80 km/h.
Pressure in bar Fan stage
8 0
10 1
14 2
15 3
17 4
18 5
19 6
19 7
20 8
21 9
21 10
22 11
23 12
26 13
29 14
29 15