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

ENGINE 272.911 in MODEL 204.0 up to Model Year 08 

ENGINE 272.921 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.947 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.948 in MODEL 204.0 up to Model Year 08 

ENGINE 272.961 in MODEL 204.0/2 up to Model Year 08 

ENGINE 272.971 in MODEL 204.0 up to Model Year 08 

The start quantity control differentiates between cold start, hot start, repeat start and starting after stationary heater operation.

In order to facilitate starting of a cold engine, fuel must also be injected during the starting procedure.

The increased injection quantity (start quantity) is achieved by extending the injection time.

The start quantity is dependent on:

• Coolant temperature
• Engine speed
• Engine off time
• After stationary heater operation, also the outside air temperature when switching off the engine

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 metered by the ME-SFI [ME] control unit (N3/10).

The start quantity is determined by the opening times of the injection valves (Y62). The opening times are also dependent on the battery voltage. In order to guarantee the start quantity at a low battery voltage, the ME-SFI [ME] control unit extends the opening times.

	Electrical function diagram, start quantity control		PE07.61-P-2758-99FAB
	Component description for fuel injection valves	Y62/1-Y62/6	GF07.03-P-6010CY
	Component description for the coolant temperature sensor	B11/4	GF07.04-P-6043CY
	Component description for the crankshaft Hall sensor	B70	GF07.04-P-6221CY
	Component description for the ME-SFI [ME] control unit	N3/10	GF07.61-P-6000CY