Audi A4

Since 1994 of release

Repair and car operation

Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
+ Cooling system
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
- Tools and devices
   Check of control tools and bulbs
   The combined device
   The indicator of quantity of fuel
   The indicator of temperature of a cooling liquid
   Auxiliary devices
   Control bulbs above in the combined device
   Control bulb of a cooling liquid
   Control bulb of level of a brake liquid
   Control bulb of pressure of oil
   Control bulb of indexes of turns
   Control bulbs in devices of the round form (and nearby)
   Control bulb of indexes of turn on the trailer
   Control bulb ASR
   Control bulb of the lock of ignition
   Control bulb of headlights of a headlight
   Control bulb of a pillow of safety
   Control bulb ABS
   Control bulb of a lay brake
   Control bulb of gymnastics of the accumulator
   System of the autocontrol of the car
   The ignition lock
   Check of switches
   Alarm buzzer of illumination
   Cigar Lighter
   Warmed back glass
   Check of screen wipers and windscreen
   The engine of screen wipers
   The help at malfunctions
   Gulf of a liquid for washing of glasses
   System of washing of headlights
   Adjustment of a mirror with the electric drive
   The central lock
   window raiser with the electric drive
   Sliding/demountable roof with the electric drive
   Radio receiver
   The aerial on back glass
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Speedometer in Audi A4, differently also could not be, is the electronic measuring device the same as also a measuring instrument of number of turns. It also processes impulses of number of turns which it (not how the tachometre) receives from the gauge on a transmission. There it is measured, with what frequency wheels rotate.

The signal of rotation of wheels is used as measuring size for run definition, and also in work of the indicator of an interval of maintenance service, the indicator of the expense of fuel, in volume control of a sound of a radio receiver and in work of the onboard computer. Therefore there was an idea to send this signal and on a speedometer and to refuse a shaft of a speedometer which provides a drive in old mechanical speedometers.

If the speedometer does not work, in the beginning check up a corresponding safety lock in a box of safety locks (the head the Electrotechnical equipment).

The run counter

Indication of the general and day run in Audi A4 is carried out by the liquid crystal display. That it was impossible to manipulate the data about run – the data about run continuously remains in the memory which independent of giving of pressure and is in the combined device.

The pulse gauge of a speedometer

Impulses of rotation of wheels move in a speedometer the gauge with герконовым contact behind on a transmission. Gerkonovyj contact represents the block of contacts which are placed in an air-tight gas cover. Contact becomes isolated in the event that it is influenced by an electromagnetic field.

That герконовый contact could give out sequence of impulses, it should open and be closed in beat frequencies of rotation of wheels. Therefore the wheel with dredging which rotates in front of the gauge, influences a magnetic field influencing the block of contacts.

Check of the pulse gauge of a speedometer


  1. Lift the left forward wheel.
  2. Press a fixing clip on a socket and remove a socket.
  3. Connect to both contacts of the gauge an ohmmeter.
  4. Now slowly turn a hand the left forward wheel: the ohmmeter indicator should fluctuate between 0 Ohm and the Ohm.
  5. If it not so, replace the gauge.

Dismantle of the pulse gauge of a speedometer


  1. Press a fixing clip on a socket and remove a socket.
  2. Slightly press downwards a clamp of a fixing clip of the gauge and slightly turn the gauge to the right.
  3. Take out the gauge from a transmission.
  4. At installation track correctness of installation of sealing rings.