This winding consists of several turns of thick wire. Under the influence of electric current around the iron core in the ignition coil, a powerful magnetic field is created - energy that enters the system for ignition.
Under the trim on the side near the front passenger's feet in models with a 5-cylinder engine is the control unit (4) for the fully electronic ignition system (VEZ). Also located here is the height sensor (3), the KE-III-Jetronic control unit (1), and the automatic transmission control unit (2). More details on this in the chapter "Body electrical system".
When the piston approaches the point at which the incoming and compressed mixture should ignite - the moment of ignition - the current in the ignition coil is interrupted. This occurs at the command of the control unit.
When the current is switched off, the magnetic field in the ignition coil is interrupted. The following occurs: in the secondary winding, consisting of a very large number of turns of thin wire, a high-voltage current pulse of several tens of thousands of volts occurs.
This secondary voltage of the ignition system is supplied through the distributor (for models with a 6-cylinder engine directly) on the spark plug whose order is right in the engine cylinders' operating order. The mixture ignites, the engine turns over further. The electrical circuit closes, the process repeats.