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
   + System of injection Mono-Motronic
   + System of injection Digifant
   + System of injection KE-III-Jetronic
   - Systems of injection of MPI and MPFI
      Operating procedure
      Lambda regulation
      Malfunctions and independent diagnostics
      Independent repair
      Visual check
      Check of separate elements
      Removal of elements
      Hummock drive of "gas"
      Check of the mode of idling and analysis of exhaust gases
      List of malfunctions
+ 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
+ Signaling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications





Malfunctions and independent diagnostics

The control unit of system of injection can distinguish and write down in memory of the store of malfunctions of exactly 30 types of the malfunctions arising in electronic system of system of ignition/injection. At the same time it is fixed: whether this malfunction is permanent or sporadic (arising only from time to time). Records about sporadic the arising malfunctions are erased after 50 starts of the engine in case sporadic malfunction did not appear again.

Data of the store of malfunctions are read out in workshops by means of the special device for reading of V. A. G 1551 (see the section Regular servicing). In house conditions it is impossible to interview memory of the store of malfunctions therefore in case of the suspected defect of system of ignition/injection it is necessary to address in a workshop for data read-out of the store of malfunctions. In addition you can use also our list of malfunctions provided in the end of the head in which the numerous possible malfunctions which are beyond independent diagnostics are given. Memory of the store of malfunctions after the made repair needs to be cleared in a workshop.

 Hint: the control unit of system of injection of MPFI (the 2,6-liter engine) remains active within one and a half hours after switching off of ignition. It means that the defect of system of injection arising at this time also registers in memory of the store of malfunctions. As defect is distinguished, including disconnected, (for example for control of the sensor) the plug.

But the aforesaid, however, does not mean that you have to wait for every time an hour and a half before to start repair. Similar interruption as malfunction arises only once and, therefore, gets to "box" for sporadic (arising from time to time) malfunctions, record about which, as we know, is again erased.








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