Motor electronics (ME) ignition system, function - GF07.61-P-3008MIS
ENGINE 272.9 in MODEL 221.0 /1 as of model year 2009/ AEJ 08
ENGINE 273.9 in MODEL 216.3, 221.0 /1 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
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:
- 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 [ME] 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 216 | PE15.12-P-2050-97CAB | ||
| Component description for ME-SFI [ME] control unit | N3/10 | Engine 273 | GF07.61-P-6000MLS | |