1. Ignition advance angle; 2. Load; 3. Number of revolutions.
The optimal ignition timing of the engine depends primarily on the instantaneous values of the engine speed and its load. The engine load status is determined by the control unit from the relationship between engine speed and throttle position.
Ignition control unit in «mostly» The control unit uses this data to determine the optimum ignition timing based on the ignition timing database. Other sensors take into account the temperature of the incoming air and the temperature of the coolant.
The distribution of high voltage to the individual cylinders is carried out by statically operated, electronically controlled parts that replace conventional mechanically operated ignition distributors with rotors.
The ignition system consists of two ignition coils located in one housing, which is mounted on the cylinder head. The ignition system is synchronized according to the signals that are issued by the pulse generator in the control unit. The pulse generator of the engine I,ol is located on the side of the cylinder block and measures the number of revolutions of the camshaft, while for other engines the number of revolutions is taken from the engine flywheel.
When the control unit of the ignition system fails, shortcomings in the operation of the car appear, namely, power decreases. Fuel consumption may also increase. Long-term damage to the engine is not to be feared when the defect is immediately repaired.
The ignition and fuel injection systems have a common electronic control unit, which is equipped with a fault code memory unit. If, while driving, malfunctions appear in the engine electronics, the codes of which are recorded in the control unit, before repairing the ignition system, you must first interrogate the memory unit in the control unit. The memory block is interrogated using a diagnostic tool connected to the diagnostic plug, which is located under the cover on the left in the driver's footwell next to the engine control unit.
Since the diagnostic tool is hardly available to the motorist, it is recommended that the diagnostic operation be carried out in a workshop.