ME-SFI starting, function - GF07.61-P-2003AMG

ENGINE 156.980 in MODEL 164, 251

ENGINE 156.982 in MODEL 209

ENGINE 156.983 in MODEL 211, 219

ENGINE 156.984 in MODEL 216, 221

Fig 1: ME-SFI Starting Function Diagram

Courtesy of MERCEDES-BENZ USA

Functions when starting:

Engine control voltage supply
Fuel supply
Start quantity control (injection system)
Ignition system
Starter control
Engine speed signal
Synchronization of fuel injection and firing order

Enrichment of fuel in engine oil

For a cold start, fuel condensing on the still cold cylinder liner can enrich the fuel in the engine oil. Once the engine oil becomes hot, the fuel evaporates the fuel again and this is led again via the crankcase ventilation system to the engine for combustion. The mixture deviation (a rich mixture) in neutral can be up to 30% and is corrected by the lambda control. Mixture adaptation saves this correction as a long-term effect. This means that a subsequent start could fail if the start mixture is too lean, although no exhalation of fuel takes place. To prevent this, the ME-SFI [ME] control unit constantly calculates the fuel quantity in the engine oil. To do this, the number of starts, the start temperature and the subsequent operating duration are evaluated.

	Voltage supply of ME-SFI control unit, function		GF07.61-P-5001AMG
	Motor electronics (ME) ignition system, function		GF07.61-P-3008AMG
	ME engine speed signal, function		GF07.61-P-3017AMG
	ME-SFI synchronization of fuel injection and firing order, function		GF07.61-P-4009AMG
	ME fuel supply, function		GF07.61-P-3004AMG
	ME-SFI start quantity control, function		GF07.61-P-3010AMG
	Starter control, function		GF15.30-P-3000AMG