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

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on ENGINE 272

Fig 1: ME-SFI Synchronization Of Fuel Injection And Firing Order Function Diagram

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

When the engine is started, the injection sequence is defined on the basis of the firing order signals supplied by the crankshaft Hall sensor and the camshaft Hall sensors To do this, ignition TDC must be detected by cylinder 1.

The synchronization of the injection and firing order is further processed by the ME control unit for actuating the ignition coils and the fuel injection valves. In addition, it is required for the anti-knock control and for the fuel cutoff at individual cylinders.

If the camshaft Hall sensors are defective, a switchover to the next sensor will take place in a particular sequence. If there is no signal available then ignition occurs after a 360° crank angle and injection occurs in order to allow an emergency start.

When the engine is shut down, coasting detection takes place, which also evaluates turning back of the engine shortly before the engine is stationary. When the computer powers down, the position found is saved as ° crankshaft angle and used the next time the engine is started. If coasting detection does not provide a result, or the shutdown engine has been moved, synchronization takes place.

Shown on ENGINE 272

Fig 2: ME-SFI Synchronization Of Fuel Injection And Firing Order Voltage Signals Chart (Engine 272)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Shown on ENGINE 273

Fig 3: ME-SFI Synchronization Of Fuel Injection And Firing Order Voltage Signals Chart (Engine 273)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Component description for the ME-SFI [ME] control unit	GF07.61-P-6000V
Component description for the crankshaft Hall sensor	GF07.04-P-6220V
Component description for the camshaft Hall sensor	GF07.04-P-6020V