ME-SFI synchronization of fuel injection and firing order, function - GF07.61-P-4009AMG

ENGINE 156.980 in MODEL 164, 251 up to Model Year 8 

ENGINE 156.982 in MODEL 209 

ENGINE 156.983 in MODEL 211, 219 

ENGINE 156.984 in MODEL 216, 221 up to Model Year 8 

When the engine is started, the injection sequence is defined on the basis of firing order signals supplied by the crankshaft Hall sensor and the camshaft Hall sensors

To do this the ignition TDC of cylinder 1 (see "a" picture below) must be recognized.

Synchronization of the injection and firing order is processed by the ME-SFI [ME] control unit for actuation of the ignition coils and the fuel injection valves.

Furthermore synchronization is required for the knock control and the fuel shutoff on the individual cylinders.

When the engine is shut down, coasting detection takes place which also evaluates turning back of the engine shortly before the engine is stationary. In the computer run-on phase the found position is stored in a ° crank angle and used for the next engine start. If "coasting detection" does not provide a result, or the shutdown engine has been moved, synchronization of the injection and firing order takes place at engine start.

If a camshaft Hall sensors is defective, switchover to the next Hall sensor will take place in a particular sequence. If is absolutely no signal is available, ignition and injection takes place after a 360° crankshaft angle, thereby facilitating an emergency start.

Component description for the fuel injection valves	Y62y1-Y62y8	GF07.03-P-6010AMG
Component description for the camshaft Hall sensor	B6/4, B6/5, B6/6, B6/7	GF07.04-P-6020AMG
Component description for the crankshaft Hall sensor	B70	GF07.04-P-6220AMG
Component description for the ME-SFI [ME] control unit	N3/10	GF07.61-P-6000AMG
Component description for ignition coils	T1/1-T1/8	GF15.10-P-2100AMG