Motor electronics (ME) ignition system, function - GF07.61-P-3008MIG

ENGINE 272.945 in MODEL 251.054/154 as of Model Year 2009/AEJ 08 

ENGINE 272.967 in MODEL 164.186 as of Model Year 2009/AEJ 08 MOPF 

ENGINE 272.967 in MODEL 251.056/065/156/165 as of Model Year 2009/AEJ 08 

ENGINE 273.923 in MODEL 164.871 as of Model Year 2009/AEJ 08 

ENGINE 273.963 in MODEL 164.172 as of Model Year 2009/AEJ 08 MOPF 

ENGINE 273.963 in MODEL 164.886, 251.072/172 as of Model Year 2009/AEJ 08 

Function requirements for the ignition system, general points 

• Circuit 87M ON (engine control ON)

Ignition system, general points 

Every cylinder is fitted with a directly plugged in single spark ignition coil.

For the ignition system, the ME-SFI (N3/10) control unit reads the following sensors and signals:

• Hot film MAF sensor (B2/5), engine load
• Intake air temperature sensor (B2/5b1)
• Crankshaft Hall sensor (B70), engine speed and crankshaft position
• LH and RH intake camshaft Hall sensors (B6/4, B6/5), intake camshaft positions
• LH and RH exhaust camshaft Hall sensors (B6/6, B6/7), exhaust camshaft positions
• Coolant temperature sensor (B11/4)
• Knock sensor 1, on the right (A16/1)
• Knock sensor 2, on the left (A16/2)
• Pressure sensor (B28), intake manifold air pressure

The requirements of the engine torque requirement function are also taken into account.

For the following partial functions, ignition angle adjustment in the direction "retarded" or "advanced" takes place:

• Idle speed control
• Inertia fuel shutoff
• Transmission overload protection
• Knock sensor system
• Engine torque request

Ignition system function sequence 

At the firing point, the ME-SFI control unit (N3/10) opens the ground end of the primary circuit (circuit 1) to the ignition coil concerned (T1).

Determination of the ignition angle takes place dependent on a performance map according to the input signals from the ME-SFI [ME] control unit.

Cylinder arrangement and ignition firing order 

Diagnosis

The ignition angles can be checked only with the Diagnosis Assistance System (DAS).

	Electrical function schematic for ignition system	Model 164		PE15.12-P-2050-97MAA
		Model 251		PE15.12-P-2050-97RAA
	ME-SFI [ME] control unit, component description	N3/10	Engine 272	GF07.61-P-6000MIG
		N3/10	Engine 273	GF07.61-P-6000MLG