Fan control function - GF07.61-P-3023G

ENGINE 111.943 /947 /951 /952 /955 /956 /957 /958 /973 /982 /983,

111.944/975 as of 1.8.96,

111.946 as of 1.6.98,

111.921/942 as of 1.9.98

with CODE (580) Air conditioning or Tempmatic for USA

with CODE (581a) Air conditioning (Automatic)

ENGINE 111.945

in MODEL 208.335 /435 as of 1.6.98,

202.020/080 as of 1.9.98

with CODE (580) Air conditioning or Tempmatic for USA

with CODE (581a) Air conditioning (Automatic)

ENGINE 111.974

with CODE (494a) USA version

with CODE (807) Model year 1997

with CODE (808) Model year 1998

ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /955 /970 /972 /973 /975

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969

ENGINE 137.970

Shown on Engine 111

Fig 1: Identifying Fan Control Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The ME-SFI control unit indirectly actuates the fan through the engine/AC electric suction fan control unit.

The fan specified speed is transmitted by the ME control unit to the engine/AC electric suction fan control unit by means of a pulse width modulated signal. The on/off ratio is 10 to 90%, in which the following means e.g.:

10% electric suction fan OFF

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.

The status of the air conditioning or automatic air conditioning is transmitted from the instrument cluster via the CAN to the ME control unit. The fan specified speed is dependent on this status.

CAN capable instrument cluster required, that the HHT or STAR DIAGNOSIS is programmed according to with/without air conditioning or automatic air conditioning.

Engine 112 at production start-up as of 3/97 with viscous fan clutch, fan control phased in as of 7/97.

On engine 137 and in Model 203, 209, 211, 230 an electric suction fan is built-in with integrated control. The engine/air conditioning electric suction fan control unit is deleted.

Motor electronics control unit, location/task/ design/function	other than engine 111 EVO	GF07.61-P-5000F
	Engine 111 EVO	GF07.61-P-5000GS
Coolant temperature sensor, location/task/ design/function	Engine 104, 111	GF07.04-P-5026G
	Engine 112, 113, 137	GF07.04-P-5026A