Ignition system function - GF07.10-P-1005MI
ENGINES 272.9 (except 272.98) in MODEL 204.0 /2 as of model year 2009/YoM 08
ENGINES 272.9 (except 272.98) in MODEL 204.9, 207.3 /4, 212.0 /2
ENGINES 273.9 in MODEL 207.3 /4, 212.0 /2
Function requirements for the ignition system, general points
- Circuit 87M ON (engine control ON)
Ignition system, general points
A single-spark ignition coil is plugged directly into each cylinder. For the ignition system, the ME-SFI (N3/10) control unit reads the following sensors and signals:
- RH knock sensor (A16/1)
- LH knock sensor (A16/2)
- Hot film MAF sensor (B2/5), engine load
- Intake air temperature sensor (B2/5b1)
- LH and RH intake camshaft Hall sensor (B6/4, B6/5), intake camshaft positions
- LH and RH exhaust camshaft Hall sensor (B6/6, B6/7), exhaust camshaft positions
- Coolant temperature sensor (B11/4)
- Pressure sensor (B28), intake manifold air pressure
- Crankshaft Hall sensor (B70), engine speed and crankshaft position
The requirements of the torque coordination 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
- Torque coordination
Ignition system function sequence
The ME-SFI [ME] control unit interrupts the respective ignition coil (T1) at the moment of the ignition timing at the ground end of the primary circuit to "circuit 1".
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 using the Xentry diagnostics
| ME-SFI [ME] control unit, component description | N3/10 | Engine 272 | GF07.61-P-6000MI |