Audi A4

since 1994 of release

Repair and car operation

A4 Audi
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ exhaust System
+ cooling System
+ Fuel tank and fuel pump
+ Air filter and absorption channels
+ injection System
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
- Electrotechnical equipment
   The minus is connected to weight
   The help for orientation in the electrotechnical equipment of the car
   Connections of wires
   Central switching knot
   Support of additional relays
   Box for electronics
   Relay and control units
   Switching relay
   H-contact of the relay of unloading
   Table of the relay and control units
   Safety locks
   Table of safety locks
   + Electric circuits
   - Accumulator
      Correctly picked up accumulator
      As far as the accumulator reserve suffices?
      Check of level of acid in the accumulator
      Check of a charge of the accumulator
      Battery charging
      Engine start with the discharged accumulator
   + Generator
   + Starter
+ ignition System
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ body Details
+ Salon
Search of malfunctions
Technical characteristics

Check of level of acid in the accumulator

Liquid in the accumulator consists of the sulfuric acid diluted with distilled water. The part of this water can evaporate or break up to hydrogen and oxygen during a battery charging.

In Audi the so-called accumulator which is not subject to maintenance which at the expense of bigger volume of liquid should, under normal circumstances is established, throughout all term of the service to do without addition of the distilled water.


    Liquid in the accumulator should reach, at least, bottom of two marks which put with a varnish on the case or have been beaten out on it of strips, and it is good to cover the upper edge of plates. If level of liquid fell, unscrew a stopper. If the accumulator is charged normally, add the distilled water to the top mark or on 15 mm above the upper edge of plates. If the accumulator was strongly discharged, add so much water, how many it is necessary to cover plates. At a charging liquid level considerably rises. The distilled water add to the top mark only after a battery charging. The amount of added water should be dosed well out, differently the accumulator will be overflowed. The overflowed accumulator перекипает too much, acid acts from under a stopper

Accumulator dismantle

Accumulator dismantle: remove a decontamination hose. In the beginning weaken the plug of a minus (3), then remove facing of a plusovy pole (4) and unscrew the plug of plus (5). Now it is possible to weaken a bolt (1) on a fixing guard (2) bases of the accumulator.


    In the beginning be convinced available a code for the coding device against radio receiver theft in order that it could be made active again after installation. In the beginning always disconnect a wire connected to a minus in order that in the course of further work there was no short circuit. Weaken a nut on the plug of a minus pole, disconnect the plug. Weaken the plug of a plusovy pole and disconnect. Unscrew a bolt of a fixing level at the accumulator basis, take out a bolt and remove a level. Remove a plastic hose of the central decontamination. Remove the accumulator. At installation in the beginning connect a wire to plus, then the minus plug. To change plugs of a wire it is possible only if to make big effort as the head of a plusovy pole is thicker than a head of the minus. Do not forget about a hose of the central decontamination. In the presence of a radio receiver with a code against theft again enter code number.

Care of accumulator contacts


    Wash away crystals of an oxide warm alkaline water or process firm «Noutralon» Varta. Grease heads of poles of the accumulator and the plug of wires with means for protection against acid (Bosch «Ft 40 v 1»). It is impossible to grease lateral faces of heads of poles and inside of plugs, differently there can be difficulties with contact.