Repair and service Audi A8 in body D2 with 1994 for 1999 of release.
1. Car operation
2. Maintenance service
3. Petrol engines of 2,8 l
4. Petrol engines of 3,7 and 4,2 l
5. Diesel engines of 2,5 l
6. Diesel engines of 3,3 l
7. Systems of ignition and injection of fuel of petrol engines
7.1. The general data
7.2. Safety requirements and preventions
7.3. Work of a control system as the engine
7.4. Check of system of injection of fuel
7.5. A fuel tank
7.6. The fuel pump / the gauge of level of fuel
7.7. An accelerator cable
7.8. Ignition system
8. System of release of the fulfilled gases of cars with petrol engines
9. The power supply system of diesel engines
10. System of prestarting heating of diesel engines
11. System of release of the fulfilled gases of cars with diesel engines
12. Greasing system
13. Cooling system
14. Coupling
15. A transmission
16. Shaft of a drive of forward wheels
17. Features of a design of transmission of all-wheel drive cars
18. A suspension bracket
19. Wheels and tyres
20. A steering
21. Brake system
22. A body
23. Heating and air-conditioning system
24. An electric equipment
25. Electric schemes


7.3. Work of a control system as the engine

The control system of the engine operates system of ignition and system of injection of fuel.
The fuel pump shipped in a fuel tank, submits fuel to a fuel highway through the fuel filter. Pressure of fuel in system copes a pressure regulator. He allows surplus of fuel to come back in a fuel tank at pressure excess in system. The fuel highway is the tank for atomizers which inject fuel into inlet channels of cylinders of the engine. In the engine the distributed system of injection of fuel is used, at which atomizers inject fuel independently from each other. The block operates work of atomizers, changing duration of an impulse – an interval of time, during which the atomizer is opened to provide giving of richer or poorer gas mixture.
Air passes through the air filter, a measuring instrument of the expense of air and throttle заслонку to inlet channels of cylinders. On the basis of the information from a measuring instrument of the expense of air and gauges the management block regulates time and quantity of injected fuel according to the measured quantity of air and frequency of rotation. The the atomizer is longer open, the more fuel is injected.
Additional gauges hand over the information to the management block about temperature of a cooling liquid and air arriving in the engine, and on models with catalytic neutralizer – about the oxygen maintenance in the fulfilled gases.
The filter with the activated coal interferes with penetration of harmful steams of fuel from a fuel tank in atmosphere. Fuel steams collect in the canister with the activated coal – an adsorber and at engine work дожигаются in engine cylinders.
The memory in the management block distinguishes the appeared malfunction and writes down it. At failure of the important gauge the management block is switched to the emergency program that the engine continued to work, though and with smaller efficiency.
The ignition system creates in each cylinder of the engine at a given time the spark category which ignites the compressed gas mixture.

7.2. Safety requirements and preventions

7.4. Check of system of injection of fuel