ME-SFI acceleration enrichment function - GF07.61-P-3015F

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

Fig 1: Identifying ME-SFI Acceleration Enrichment Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task

Preventing acceleration jerks

Design/function

If the throttle valve was opened rapidly when accelerating, a leaner mixture is produced for a short time. An additional quantity of fuel is metered to the engine in line with the map. This is achieved by actuating the injectors with additional pulses.

Acceleration enrichment is dependent on:

Coolant temperature
Load change speed (accelerator speed)
Engine speed
Engine load
Correction programming with HHT or STAR DIAGNOSIS

Motor electronics control unit, location/task/ design/function		GF07.61-P-5000F
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
Electronic accelerator, location/design/function	Engine 120	GF30.20-P-3010F
Electronic accelerator, location/design/function	Engine 104, 111, 112, 113, 119, 137	GF30.20-P-3010E
Crankshaft position sensor, location/task/ design/function		GF07.04-P-4116F
Hot film mass air flow sensor, location/task/ design/function	Engine 104, 111, 112, 113, 137	GF07.07-P-4118G
	Engine 119, 120 (round connector)	GF07.07-P-4118E
Pedal value sensor, location/task/design/ function		GF30.20-P-4011L
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
Correction programming function		GF07.61-P-3031F