Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
- Engine electric equipment
   - System of electronic control by ignition and injection
      Self-diagnostics of systems of electronic control of second generation OBD II
      Ignition system
      Checks of system of ignition and injection
      Spark plugs
   + Charge and start systems
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Ignition system


The ignition system generates a spark of ignition which ignites fuel-air a mix. For this purpose in coils of ignition pressure of the storage battery 12 In will be transformed to pressure 30 000 Century

The system of ignition of the petrol engine is a component of a control system of the engine. The ignition moment is defined by a control system of the engine. Thus the monitor the engine is based in the field of characteristics of ignition and in addition uses signals of various gauges. Synchronisation of system of ignition is reached by the signals arriving from the gauge of the Hall or the pulse gauge on distributive or cranked shaft of the engine.

Antidetonation regulation provides economic work of the engine with high degree of compression. For this purpose detonation gauges transmit signals in a monitor the engine which if necessary displaces the ignition moment in a direction "late".

System of direct ignition

Distribution of a high voltage of ignition on separate spark plugs occurs electronic elements which are replacement to the mechanical distributor of ignition.

Elements of system of ignition do not wear out and do not demand service. Replacements in the course of maintenance service demand only a spark plug.

At work with electronic system of ignition for avoidance травмирования people or damages of the system it is necessary to observe the security measures stated in the beginning of this Chapter.

Arrangement of coils of ignition:

Engines to 125 h.p.: the ignition System has on 2 candles on one coil. Both coils of ignition are fixed together in one case on a head of cylinders. At the engine of h.p. of 1.8 l/125 and the engine of 1.6 l in addition in the case of coils of ignition the powerful target cascade is located.

Engines with турбокомпрессором 1.8 l: 4 coils of ignition are located directly on spark plugs.

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