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
   + System of injection of Digifant
   - System of injection of KE-III-Jetronic
      Basic elements
      Operating procedure
      Lambda regulation
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Search of malfunctions
      Removal of components
      Check of a mode of idling and analysis of exhaust gases
      List of malfunctions
   + 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



System of injection of KE-III-Jetronic

Multipoint injection

The engines equipped with system of injection of gasoline, pull together clean air. In addition to it the system of injection doses out fuel for each cylinder. At models it occurs to the 5-cylinder engine constantly (kontinuierlich) and management of this process is carried out elektronno (elektronisch) therefore our system of injection received the name KE-III-Jetronic.

Action principle

The primary form of this system of injection, K-Jetronic, worked purely mechanically by a principle «a lot of inlet air – a lot of fuel». And such simple devices as a regulator of enrichment of gas mixture at warming up of the engine and the starting valve, in addition provided a prisposablivayemost to difficult service conditions. To combine a lambda regulation (with adjustable catalytic converter) with classical system K-Jetronic without additional devices it was impossible.

This circumstance served as the main reason for further development of KE-Jetronic. Basic elements of former system remained and were added with the electronic control unit and a so-called regulator of pressure – in addition influencing fuel dispensing by regulator with an electromagnetic drive. The regulator of pressure is active mainly during engine warming up, however it also carries out the central function at regulation of composition of gas mixture through a lambda regulation (adjustable catalytic converter).

Together with completely electronic system of ignition of "VEZ" (the ignition System is considered in head) this system of injection represents a full control system of the engine. Though each system is supplied with own control unit, between them there is a data exchange. Besides, as information sources for ignition and injection systems the same sensors often serve.

The store of malfunctions which is writing down malfunctions during movement, finishes electronics possibilities. Memory of the store of malfunctions can be interrogated for establishment of the reason of malfunctions.