The electronic ignition system is an integral part of the engine management system. Its main working components are spark plugs, ignition coils and modules, and on M73 engines – ignition distributors. On engines other than the M73, the distribution of the I/O voltage supply to the spark plugs is controlled by the engine control module (ECM).
Manual adjustment of the ignition timing is not performed; if the required settings are not met, the faulty components must be replaced.
The ignition system components are not subject to wear and do not require regular maintenance. In accordance with the maintenance schedule (see chapter Vehicle settings and routine maintenance) should be produced only replacement of spark plugs.
System preheating diesel engines is designed to preheat the combustion chambers for the purpose of confident ignition of diesel fuel. Glow plugs are used as heating elements, the operation of which is controlled by the corresponding electronic unit.
Basic information on the operation and sensors of the systems management engine and fuel injection are described in Chapter Fuel and exhaust systems.
Safety precautions when working with ignition and fuel injection control systems
To prevent injury and/or failure of electrical and electronic system components, the following must be observed:
- Do not touch or disconnect ignition system wiring while the engine is running/starter is cranking;
- Disconnect/connect injection control system fuel lines, ignition system wiring, as well as any diagnostic and measuring equipment only with the ignition off;
- Maintenance work on the electronic ignition system is not permitted for people with an implanted pacemaker;
(Information taken from this resource: «BMWMAN.ru»)