Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
+ Cooling system
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
- System of ignition
   What provides ignition
   When there is an ignition of fuel-air mix?
   Different systems of ignition
   So there is an ignition spark
   Executive body
   System brain
   The signals coming to the control unit
   Adjustment of a detonation
   Be careful in the address with ignition
   Works on system of ignition
   Search of malfunctions in ignition
   Ignition distributor
   Knot of high voltage
   Replacement of spark plugs
   Right choice of spark plugs
   Check of the moment of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Executive body

Terminal cascade

In the terminal cascade the powerful transistor settles down, he switches on and off current to the ignition coil (or to ignition coils). Thanks to it high currents cannot damage sensitive electronics of the control unit.

Terminal cascades of separate engines settle down:

  • in the 74 kW engine near the ignition coil;
  • in the 92 kW engine over ignition coils on a head of the block of cylinders;
  • in the 110 kW four-cylinder engine under a cover of the case of the air filter;
  • in the six-cylinder engine also under a cover of the air filter.