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

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on engine 272.963 in model 171

Fig 1: ME-SFI Start Quantity Control Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

The start quantity control must guarantee the safe start of the engine. To do this, a decision is made as to whether this is a cold start, a warm start, a repeat start or a start following operation of the stationary heater.

In order to facilitate starting a cold engine, in addition fuel must be injected during the starting procedure, depending on the coolant temperature. The increased quantity of fuel injected is achieved by extending the injection time.

The start quantity control is enabled after start recognition. It remains 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.

The start quantity control is dependent on:

Start identification (CAN message "Terminal 50 ON")
Coolant temperature
Engine speed
Following operation of the stationary heater, in addition to the external air temperature when the engine was last shut-off (CAN message from the instrument cluster), intake air temperature and shut-off time of the engine.

Component description for the ME-SFI [ME] control unit	GF07.61-P-6000V
Component description for the crankshaft Hall sensor	GF07.04-P-6220V
Component description for the coolant temperature	GF07.04-P-6040V
Component description for the hot film MAF sensor	GF07.07-P-6000V
Component description for the fuel injection valves	GF07.03-P-6010V