Audi A3

since 1997 of release

Repair and car operation

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


Ignition system


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

The system of ignition of the petrol engine is a component of a control system of the engine. The moment of ignition 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 sensors. Synchronization of system of ignition is reached by the signals arriving from the sensor of the Hall or the pulse sensor on distributive or cranked to a shaft of the engine.

Anti-detonation regulation provides economic operation of the engine with high extent of compression. For this purpose detonation sensors transmit signals in a monitor the engine which if necessary displaces the ignition moment in the 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 demand only a spark plug.

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

Arrangement of coils of ignition:

Engines to 125 h.p.: The system of ignition 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 1.8 of l/125 of h.p. and the engine of 1.6 l in addition in the case of coils of ignition the powerful target cascade is located.

Engines from turbokompressory 1.8 l: 4 coils of ignition are located directly on spark plugs.