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
   Various systems of ignition
   Principle of work of ignition
   Executive body
   "Brain" of system
   Impulses for the control unit
   Regulation on a detonation
   Security measures during the work with system of ignition
   Repair of system of ignition
   Diagnostics of system of ignition
   Ignition distributor
   Sensor of detonation combustion
   Elements of a high voltage
   Replacement of spark plugs
   Spark plugs
   Check of the moment of ignition
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications

Executive body

Electronic transistor switchboard

In the electronic switchboard there is a powerful transistor which switches on and off giving of current to the ignition coil (or to ignition coils). Thus, huge tension cannot prevent operation of sensitive electronics of the control unit. However the transistor gives current not to that moment at which the Hall sensor (models with 4-and 5-cylinder engines) or the ignition moment sensor (models with 6-cylinder engines) is delivered by the impulses. The control unit independently defines a certain moment of ignition, giving thereby an inclusion/switching off impulse.