ME-SFI deceleration fuel shutoff function - GF07.61-P-4019F

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 

Task 

• Improve exhaust characteristics in the overrun
• Increase the braking effect of the engine in the overrun
• Reducing fuel consumption.

Function 

In the deceleration mode the ME-SFI control unit switches off the fuel injectors if, for example, in the case of engine 119:

• Coolant temperature > 50 °C
• Engine speed > 1350 rpm
• Throttle valve closed (recognition through throttle valve actual value potentiometer)
• Cruise control "OFF"

The fuel injectors are switched on again if e.g. on engine 119:

• Engine speed < 1100 rpm
• Throttle valve opened

  (recognition through throttle valve actual value potentiometer)

• Cruise control "ON"

The ignition timing point is briefly retarded when fuel injection recommences after deceleration fuel shutoff in order to prevent a sudden increase in torque.

After the deceleration mode, the mixture is briefly enriched in order to eliminate the enriched oxygen in the three way catalytic converters resulting from the deceleration mode. This ensures that an optimal conversion rate is more rapidly achieved.

Engine speed and coolant temperature differ depending on engine and transmission version.

	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 112, 113, 137	GF07.04-P-5026A
		Engine 104, 111	GF07.04-P-5026G
	Crankshaft position sensor, location/task/ design/function		GF07.04-P-4116F
	Electronic accelerator/cruise control/idle speed control actuator location/task/design/function		GF30.22-P-4010F
	Pedal value sensor, location/task/design/ function		GF30.20-P-4011L
	Cruise control switch, location/task/design/ function	with cruise control or Distronic	GF30.30-P-3100F
	Variable cruise control switch, location/task/ design/function	with cruise control or Distronic except	GF30.30-P-3101A