ME-SFI starting function - GF07.61-P-2003GS

ENGINE 111.951 in MODEL 203.035 

ENGINE 111.952 in MODEL 202.081 

ENGINE 111.955 in MODEL 203.045 

ENGINE 111.956 in MODEL 202.087, 208.344 /444 

ENGINE 111.957 in MODEL 210.048 /248 

ENGINE 111.958 in MODEL 170.444 

ENGINE 111.982 in MODEL 208.448 

ENGINE 111.983 in MODEL 170.449 

Start quantity control 

Fuel has to be injected additionally during the start operation, in line with the coolant temperature, in order to facilitate starting of a cold engine. The increased quantity of fuel injected is achieved by extending the injection time.

Battery voltage and voltage supply 

The injected fuel quantity is determined by the opening times of the fuel injectors. This opening time is dependent on the battery voltage. The ME control module extends the injection time in order to compensate the quantity injected if, for example, the battery voltage is low. No further engine start is possible below approx. 7 V.

Post-start enrichment 

After starting the engine from cold, it is necessary to enrich the mixture with additional fuel for a short time. The fuel which precipitates on the cylinder walls, is compensated for by this enrichment, and the engine runs smoothly.

Synchronization of fuel injection and firing order 

In order to achieve correct assignment of the fuel injection and firing order to the respective cylinder, the sequence is synchronized during the first engine revolutions. The ME-SFI control module requires the signals from the camshaft Hall sensor and crankshaft position sensor for this purpose.

Ignition at engine start 

When the engine is started and up to approx. 500 rpm, the ignition timing point is controlled only on the basis of the signals supplied by the camshaft Hall sensor. Only once the engine speed has reached approx. 600 rpm is a transition made from the fixed ignition timing point to the ignition timing point calculated in line with the momentary operating state.

Starter control 

The solenoid switch of the starter (circuit 50) is actuated through the starter relay by the engine control module.

The drive authorization system inhibits the engine management system. Although the starter rotates, the engine does not start.

	Electronic ignition switch (EIS) control module location/task/design/function	Model 202, 208, 210	GF80.57-P-4102A
	ME-SFI fuel supply function		GF07.61-P-3004GS
	ME-SFI ignition system function		GF15.12-P-0001GS
	Start quantity control, design/task/function		GF07.61-P-3010GS
	Synchronizing fuel injection and firing order function		GF07.61-P-4009GS
	ETC control module, location/task	Selector lever position information P/N and driving position engaged. Transmission 722.6	GF27.19-P-4012G
	Starter control function	with manual transmission	GF15.30-P-3000GB
		with automatic transmission	GF15.30-P-3000GS
		with manual transmission	GF15.30-P-3000GC