Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

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
- Injection system
   - System of injection of Mono-Motronic
      Operating procedure
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Check of a mode of idling and analysis of exhaust gases
      Check of catalytic converter and lambda probe
      Hummock drive of "gas"
      List of malfunctions
   + System of injection of Digifant
   + System of injection of KE-III-Jetronic
   + Systems of injection of MPI and MPFI
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Independent repair

Type of the block of preparation of gas mixture of system of injection of Mono-Motronic at the removed air filter

1–pressure regulator;
2–the connecting tip for a nozzle and the sensor of temperature of arriving air;
3–connecting tip of a potentiometer of a butterfly valve;

5–the sensor of temperature of arriving air.

Many checks of system of injection, unfortunately, cannot be carried out at home because of lack of devices necessary for check. But nevertheless there is a certain field for activity.

The control unit cannot be checked "house" means. But from practice it is known that malfunctions here arise very seldom.

Give a reason for claims sensors, switches and cable connections much more often. Therefore at the found malfunctions the following operations procedure is recommended:


  1. To establish that ignition as it should be.
  2. To check supply by fuel.
  3. To carry out visual check of elements of system of injection.
  4. If thus malfunction was not found, to see the list of malfunctions at the end of head and to check in a workshop the store of malfunctions, to check a suspected detail according to the specified scheme.

 Help: at an injection system crash at first check safety locks No. 13, 21, 25, 27 and 28. Through them passes all food of system of injection of Mono-Motronic.