Ignition Control Module: Description and Operation

GF15.12-P-0001V ME-SFI Ignition System, Function
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 in model 171

A16/1 Knock sensor 1, right
A16/2 Knock sensor 2, left
B2/5 Hot film mass air flow sensor
B6/4 Left intake camshaft Hall sensor
B6/5 Right intake camshaft Hall sensor
B6/6 Left exhaust camshaft Hall sensor
B6/7 Right exhaust camshaft Hall sensor
B11/4 Coolant temperature sensor
B37 Accelerator pedal sensor
B70 Crankshaft Hall sensor
M16/6 Throttle valve actuator
N3/10 ME control unit
N47-5 ESP and BAS control unit
T1/1...
T1/6 Ignition coil cylinders 1 to 6
X11/4 Data link connector
Y3/8n4 Fully integrated transmission control (VGS) control unit (with automatic transmission 722.9)

CAN Data bus








Cylinder arrangement and ignition firing order

The ME-SFI control unit essentially analyzes the following signals for determining the ignition angle:

^ Air mass
^ Position and rpm of crankshaft
^ Positions of intake camshafts
^ Positions of exhaust camshafts
^ Coolant temperature
^ Intake air temperature
^ Knock sensor signals
^ Intake manifold air pressure
^ Engine torque requests

The ME-SFI [ME] control unit interrupts the respective ignition coil at the moment of the ignition timing of the primary circuit to "terminal 1".

Ignition angle adaptation
For the following partial functions an ignition angle adjustment in the direction "retarded" or "advanced" can take place:

^ Catalytic converter heating-up
^ Idle speed control
^ Overheating / knock protection
^ Deceleration fuel shutoff
^ Transmission overload protection (with automatic transmission 722.9)
^ Anti-knock control [AKC]
^ Engine torque requests

The ignition angle can only be checked using the DAS.