Ignition System

GENERAL INFORMATION

The ignition system generates the spark that ignites the air-fuel mixture. For this purpose, the 12 V battery voltage is converted to 30,000 V in the ignition coils.

The ignition system of a gasoline engine is an integral part of the engine management system. Ignition timing is controlled by the engine management system. The engine control unit uses the ignition timing map and additionally processes signals from various sensors. Ignition system synchronization is achieved by signals from a Hall sensor or a pulse sensor on the camshaft or crankshaft.

Knock control ensures economical operation of a high-compression engine. For this, knock sensors send signals to the engine control unit, which retards the ignition timing when necessary.

Direct ignition system

High-voltage ignition distribution to the individual spark plugs is performed by electronic components, which replace the mechanical ignition distributor.

Ignition system components do not wear and require no maintenance. Only the spark plugs need to be replaced during routine maintenance.

When working on the electronic ignition system, observe the safety precautions given at the beginning of this chapter to avoid personal injury or damage to the system.

Location of ignition coils:

Engines up to 125 L hp: The ignition system has 2 spark plugs per coil. Both ignition coils are mounted together in one housing on the cylinder head. On the 1.8 L/125 L hp engine and the 1.6 L engine, the ignition coil housing also contains a power output stage.

Turbocharged engines 1.8 L: 4 ignition coils are mounted directly on the spark plugs.