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ME-SFI start quantity control function - GF07.61-P-3010F

ENGINE 104.941 /943 /944 /991 /994as of 1.8.96 

ENGINE 104.995 

with CODE (494a) USA version 

with CODE (807) Model year 1997 

with CODE (808) Model year 1998 

with CODE (498) as of Model year 97 Japanese version 

ENGINE 111.921 /942 as of 1.9.98, 

111.943, 

111.944 as of 1.8.96, 

111.946 as of 1.6.98, 

111.947/973, 

111.975 as of 1.8.96 

ENGINE 111.945 

in MODEL 208.335/435 as of 1.6.98, 

202.020/080 as of 1.9.98 

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 119.980 /981 /982 /985 

ENGINE 120.982/983 

ENGINE 137.970 

Shown on Engine 119 in Model 210 

Fig 1: Identifying ME-SFI Start Quantity Control Function
G04605921Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task 

In order to facilitate starting of the engine when cold, additional fuel must be injected during engine start operation, depending on the coolant temperature. The increased quantity of fuel injected is achieved by extending the injection time.

Design/function 

The start quantity control is dependent on:

The start quantity control is enabled after start recognition. It continues to remain activated until a temperature-related engine speed is exceeded.

The higher the coolant temperature, the lower is the start quantity enable by the ME-SFI control unit.

  Motor electronics control unit, location/task/ design/function   GF07.61-P-5000F 
  Start recognition function Engine 104, 111, 112, 113, 137 GF07.13-P-3014G 
Engine 119, 120 (via engine speed signal) GF07.13-P-3014F 
  Crankshaft position sensor, location/task/ design/function   GF07.04-P-4116F
  Coolant temperature sensor, location/task/ design/function Engine 119, 120 GF07.04-P-5026F
Engine 104, 111 GF07.04-P-5026G
Engine 112, 113, 137 GF07.04-P-5026A
  Pressure sensor location/design/task/function with air injection
Engine 104 and 111
Engine 112, 113
Engine 119, 120, 137
Engine 113 with CODE 479 (cylinder shutoff)
GF07.04-P-5014F
  Electronic accelerator/cruise control/idle speed control actuator, location/task/design/function   GF30.22-P-4010F
  Fuel injector, location/task/design/function   GF07.03-P-5004F
  Voltage supply of ME-SFI control unit function   GF07.61-P-5001F 
  Electronic power control indicator lamp, location/task/design/function Engine 119, 120 in
Model 129, 140 up to 5/96
GF30.20-P-4012L
  Engine diagnosis malfunction indicator lamp, location/task/function EURO3/4 (Code 925/926 or standard) GF54.30-P-4102A
  CHECK ENGINE malfunction indicator lamp, location/task/function USA ONLY GF07.13-P-3144F 
  Three-way catalytic converter location/task/ design/function   GF49.10-P-3002F