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

ENGINE 275.950 in MODEL 215, 220

ENGINE 275.951 in MODEL 230 up to Model Year 8

ENGINE 275.953 in MODEL 216, 221 up to Model Year 8

ENGINE 275.954 in MODEL 230 up to Model Year 8

ENGINE 275.980 in MODEL 215, 220

ENGINE 275.981 in MODEL 230 up to Model Year 8

ENGINE 275.982 in MODEL 216, 221 up to Model Year 8

ENGINE 285.950 in MODEL 240

ENGINE 285.980 in MODEL 240

Shown on models 215, 220, 230, 240

Fig 1: Identifying ME-SFI Start Quantity Control Function Diagram

Courtesy of MERCEDES-BENZ USA

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 fuel injection quantity is achieved by extending the injection time.

Design/function

The start quantity control is dependent on:

Start detection by means of CAN message "Circuit 50 ON"
Coolant temperature
Engine speed
Engine off time
Altitude level

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.

ME-SFI control unit, location/task/design/ function		GF07.61-P-5000M
Crankshaft position sensor, location/task/ design/function		GF07.04-P-4116M
Coolant temperature sensor, location/task/ design/function		GF07.04-P-5026M
Throttle valve actuator, location/task/design/ function		GF30.22-P-4101M
Fuel injection valve, location/task/design/ function		GF07.03-P-5004M
Voltage supply of ME-SFI control unit, function	Model 215, 220, 240	GF07.61-P-5001M
	Model 216, 221	GF07.61-P-5001MS
	Model 230	GF07.61-P-5001R