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
   - Charge and start systems
      The storage battery
      Removal and installation of the storage battery
      Check of the storage battery
      The generator - the general data and security measures
      Check of the established generator
      Removal and generator installation
      Check and replacement of brushes of the generator and pressure regulator
      Starter - the general data
      Check of system of start of the engine
      Removal and starter installation
      Check, removal and installation of the traction relay of a starter
+ 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

The storage battery


Established 12 In the battery consists of six банок, containing positive and negative plates which are lowered in a solution of sulfuric acid. The battery problem includes production of a current for start of the car, ignition and for illumination, and also for other consumers of the electric power.

The battery possesses 100 % efficiency at 27С. At-18S efficiency falls to 40 %. Now to start the engine, it is necessary to have more than twice more energy, than it was necessary at 27С.

Starting capacity (starting current) shows ability of the accumulator to start the car in the conditions of very cold weather. It shows a current in amperes which gives the accumulator within 30 seconds at-18S without a power failure more low 7.2 volt (a minimum level demanded for reliable start). The above this indicator, the more starting capacity of the accumulator.
Reserve capacity shows time in minutes during which the accumulator gives a current of 25 Amperes at 27С, i.e. time during which the accumulator ensures functioning of all auxiliary devices in the car at night and in the conditions of bad weather at the faulty generator.

In winter conditions at-18S and more low the battery it will be bad to be charged in connection with increase of internal resistance. At short trips in the winter the energy spent by the battery on start, is not restored. As a result the battery works on deterioration, is constantly discharged and eventually refuses.

In summer months after long trips the engine strongly heats up, and often happens that it is difficult for starting anew. Such “hot starts” sometimes demand as much capacity, how many and at cold weather, or it is more. It especially extends on высококомпрессионные engines with the big working volume and cars with the conditioner. It once again underlines importance of a correct choice of the accumulator according to the car engine.

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