Audi 80/Avant (B4)

Audi 80/Avant
The description
System of release of the fulfilled gases
Cooling system
Fuel tank and the fuel pump
The air filter and intake channels
Injection system
Transmission and transmission
Suspension bracket and steering
Brake system
Antiblocking system of brakes
Wheels and tyres
body electrosystem
Ignition system
Signalling devices
- Devices and auxiliary devices
   Check of indicators and signalling devices
   Elements of a combination of devices
   The indicator of quantity of fuel
   The indicator of temperature of a cooling liquid
   Voltage stabilizer
   Additional devices
   The top indicators in a combination of devices
   The indicator of a cooling liquid
   The indicator of brake system
   The indicator of pressure of oil
   Indicators of indexes of turns
   The bottom indicators
   The indicator of a charge of the storage battery
   The indicator of indexes of turn of the trailer
   The indicator of a pillow of safety
   The indicator of antiblocking system
   The headlight indicator
   The indicator of a lay brake
   Self-examination system
   The ignition lock
   Check of switches
   Buzzer of switching-off of illumination and radio
   Heating of back glass
   Check of screen wipers and стеклоомывателей
   The screen wiper engine
   The list of malfunctions
   Screen wiper of back glass
   The list of malfunctions
   Replenishment of a tank of a washer of glasses
   System of washing of headlights
   The aerial of back glass
   Electric regulation of external rear-view mirrors
   System of locks with the central management
   Electric glass lifts
Heating and ventilation
Body elements
Search of malfunctions


Earlier to us the speedometer which was put in action by flexible shaft – speedometer shaft was habitual. Absolutely in another way in Audi 80: its speedometer is the electronic measuring device similar to a tachometre. The same as a tachometre, it receives impulses of frequency of rotation – but not from the engine, and from the gauge in a transmission. There frequency of rotation of wheels is measured. The device correlates impulses of turns to the time factor and thus receives reference size for speed.

In the absence of a mechanical drive the counter of the passed way functions partially электрически: the so-called step-by-step engine turns a power shaft of transmission of the counter step by step further – depending on number of impulses of turns.

Advantages of an electronic speedometer: a silent drive, more exact indicators.

If the speedometer does not work, it is necessary to check up at first a corresponding safety lock in a compartment for safety locks.

The gauge of impulses of a speedometer

At the left in front on a transmission we see the tip of the switch of a headlight of a backing (1) and the gauge of impulses of a speedometer (2). For removal of the gauge of impulses of a speedometer after pressing on safety bracket separate the tip (3), press downwards a latch (marksman), turn the gauge of impulses and extend it.

Impulses of turns for a speedometer proceed from герконового the gauge at the left on a transmission. Геркон is the contact group tightly closed and located in a gas cover. Contact becomes isolated, if it is influenced by a magnetic field. That геркон delivered impulses, it should become isolated and be disconnected in beat frequencies of rotation. Therefore the wheel with the dredging, rotating in front of the gauge, influences a magnetic field influencing contact group.

Check of the gauge of impulses of a speedometer


  1. To lift the left forward wheel.
  2. To wring out fixing bracket on the tip of the gauge and to remove it.
  3. To connect an ohmmeter to both contacts of the gauge and now slowly to turn the left wheel a hand.
  4. Ohmmeter indicators should fluctuate between 0 Ohm and.
  5. If it not so, it is necessary to replace the gauge.

Removal of the generator of impulses of a speedometer


  1. To wring out fixing bracket on the tip of the gauge and to remove it.
  2. Slightly to press downwards a latch on fixing скобе and a few to turn the gauge to the right (clockwise).
  3. To extend the gauge from a transmission.
  4. At installation pay attention to correct landing of a rubber sealing ring.