Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ System of injection
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrical system
+ System of ignition
+ Lighting
+ Signalling devices
- Devices and auxiliary devices
   Check of indicators and signaling devices
   Elements of a combination of devices
   Indicator of amount of fuel
   Indicator of temperature of cooling liquid
   Voltage stabilizer
   Additional devices
   The top indicators in a combination of devices
   Indicator of cooling liquid
   Indicator of brake system
   Oil pressure indicator
   Indicators of indexes of turns
   Lower indicators
   Battery charge indicator
   Indicator of indexes of turn of the trailer
   Safety cushion indicator
   Indicator of anti-blocking system
   Indicator of a driving beam
   Indicator of the parking brake
   System of self-examination
   Ignition lock
   Check of switches
   Buzzer of shutdown of lighting and radio
   Heating of back glass
   Check of screen wipers and windscreen washers
   Screen wiper engine
   List of malfunctions
   Screen wiper of back glass
   List of malfunctions
   Replenishment of a washer reservoir of glasses
   System of washing of headlights
   Audio system
   Antenna of back glass
   Electric regulation of external rear-view mirrors
   System of locks with the central management
   Power windows
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications


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

Due to the lack of the mechanical drive the counter of the passable way functions partially electrically: the so-called 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: silent drive, more exact indicators.

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

Sensor of impulses of a speedometer

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

Impulses of turns for a speedometer proceed from the gerkonovy sensor at the left on a transmission. Gerkon is the contact group which is hermetically closed and located in a gas cover. Contact becomes isolated if it is influenced by a magnetic field. In order that gerkon delivered impulses, it has to become isolated and be disconnected in beat rotation frequencies. Therefore the wheel with dredging rotating in front of the sensor influences the magnetic field influencing contact group.

Check of the sensor of impulses of a speedometer


  1. To lift the left forward wheel.
  2. To wring out a fixing bracket on the plug of the sensor and to remove it.
  3. To connect an ohmmeter to both contacts of the sensor and now slowly to turn the left wheel a hand.
  4. Indicators of an ohmmeter have to fluctuate between 0 Ohms and.
  5. If it not so, it is necessary to replace the sensor.

Removal of the generator of impulses of a speedometer


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