Audi A4, S4

Since 2000 of release

Repair and car operation



Audi A4, S4
+ Introduction
+ Controls and receptions of safe operation
+ Current leaving and service
+ The engine
+ Systems of cooling, heating and the air conditioner
- Power supply systems, release and decrease in toxicity of the fulfilled gases
   + Power supply systems of petrol and diesel engines
   + System of injection of fuel of the petrol engine
   + System of injection of fuel of the diesel engine
   - Systems of release and decrease in toxicity of the fulfilled gases. turbocharger
      Removal and installation of system of release. Replacement of the central, additional muffler, a trailer pipe
      Updating of a lining of system of release / a trailer pipe
      Systems of decrease in toxicity of release - the general information
      The Katalitichesky converter
      Removal and installation каталитического the converter and ljambda-probes
      turbocharger - the general information and safety measures
      Интеркулер - the general information
+ Systems of an electric equipment of the engine
+ Manual box of a gear change
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment



Systems of decrease in toxicity of release - the general information

The scheme of connection of vacuum lines. The engine of 1.8 l

1 — system EVAP Adsorber
2 — From a fuel tank
3 — the Valve of management of a purge of adsorber EVAP
4 — the Control valve of depression in adsorber EVAP
5 — an air cleaner Casing
6 — Turbokompressor
7 — the management Valve an additional admission of air
8 — the Regulator of pressure of fuel
9 — To the amplifier of brakes
10 — the Vacuum control valve
11 — the Vacuum amplifier
12 — To the pump of definition of leaks
13 — the Vacuum chamber
14 — Vacuum distributor "T"
15 — the Vacuum control valve
16 — Э/м the valve of an additional admission of air

17 — Ventilation картера
18 — the Vacuum control valve
19 — To the pump of definition of leaks
20 — the Vacuum control valve
21 — the Cooler турбокомпрессора
22 — the Module of management of the valve throttle заслонки
23 — the Valve recycling турбокомпрессора
24 — the Inlet air line
25 — the E/motor of the pump of an additional admission of air
26 — Switch GUR
27 — the Module of management of the valve throttle заслонки
28 — the Valve of management of a purge of adsorber EVAP
29 — the Gauge of pressure of forced air

Cхема connections of vacuum lines. Engine V6

1 — the Amplifier of brakes
2 — the Vacuum control valve
3 — the Vacuum chamber (for the switching valve of an inlet air line)
4 — the Vacuum control valve
5 — the throttle Case
6 — the Vacuum chamber
7 — an air cleaner Casing
8 — the Inlet air line
9 — system EVAP Adsorber
10 — the Valve of management of a purge of adsorber EVAP

11 — the Regulator of pressure of fuel
12 — Vacuum distributor "T" to valve EGR and К/В
13 — the Vacuum control valve
14 — Vacuum distributor "T" to К/В
15 — TO К/В
16 — the Switching valve of an inlet air line
17 — e / the Magnetic valve of management of depression EGR
18 — the Sound absorber
19 — Control valve EGR

Petrol models

In power supply systems of all petrol models it should be used only Unleaded gasoline. The control system of the engine functions so that to receive the maximum return from the engine at the minimum expense of fuel and toxicity of the fulfilled gases. The system of catching of steams of fuel prevents their hit from a fuel tank in atmosphere. The system recycling the fulfilled gases is established.

Ventilation system картера

For elimination of leaks of not burnt down hydrocarbons in atmosphere the engine completely герметизирован. Gases and steams of oil formed in картере, through the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases leave from картера for the account of a difference of pressure in картере and the inlet pipeline (pressure in картере above).

The Katalitichesky converter

For decrease in quantity of harmful emissions atmosphere on all petrol models in release system it is built in трёхфункциональный каталитический the converter. The control system of fuel injection has a feedback in which the ljambda-probe is included. This gauge established in system of release, constantly informs the management block on structure of the fulfilled gases. Depending on the received data, the management block corrects quality of the mix submitted to the chambers of combustion and, thus, optimises fuel combustion.

The heating element included by the block of management through the special relay is built in a ljambda-probe. The working surface of a ljambda-probe is sensitive to change of the maintenance of oxygen in gases. Depending on concentration of oxygen, the gauge sends signals of different pressure. If the mix переобогащена - the oxygen maintenance in the fulfilled gases very low, the gauge submits signals with a low voltage. Pressure increases in process of pauperisation of a mix and increase in the maintenance of oxygen in gases. Most effectively the converter works at optimum quality of a gas mixture (14.7 parts of air on 1 part of fuel). At optimum concentration of oxygen in the fulfilled gases there is a jump in pressure on the gauge. This jump is a reference point for the management block at updating of quality of a mix.

It is established on two gauges. One - before, and the second — after the converter. It reaches more exact tracing of structure of the fulfilled gases.

System recycling the fulfilled gases

The system recycling the fulfilled gases allows to lower quantity NOx in the fulfilled gases. For this purpose the small part of the fulfilled gases moves in the inlet pipeline through the special valve. The system valve recycling copes the management block.

System of catching of steams of fuel

Lines of system of catching of steams of fuel. The engine of 1.8 l

1 — the Vacuum control valve
2 — the Valve of management of a purge of adsorber EVAP
3 — the Final pipeline from the valve of management of a purge of adsorber EVAP
4 — the Final pipeline from the gravitational valve
5 — system EVAP Adsorber
6 — To the pump of definition of leaks
7 — the Casing of the air filter

8 — the Pump of definition of leaks
9 Vacuum hose of an inlet air line to the pump of definition of leaks
10 — the Vacuum chamber
11 — the Control valve
12 — Vacuum distributor "T"
13 — the Module of management of the valve throttle заслонки

Lines of system of catching of steams of fuel. Engine V6

1 — the Module of management of the activator throttle заслонки
2 — the Valve of management of a purge of adsorber EVAP
3 — the Final pipeline from the valve of management of a purge of adsorber EVAP
4 — the Final pipeline from the gravitational valve
5 — system EVAP Adsorber

6 — the Vacuum hose of an inlet air line to the pump of definition of leaks
7 — the Casing of the air filter
8 — the Pump of definition of leaks
9 — the Vacuum hose of an inlet air line to the module of management of the activator throttle заслонки
10 — Vacuum connection T

For emission decrease in atmosphere of not burnt down hydrocarbons on all petrol models the system of catching of fuel is established. The refuelling mouth of a fuel tank is tightly closed by a cover, under a fuel tank the coal adsorber is established. In it steams of fuel formed in a tank during parking of the car gather, and are stored there until on a signal of the block of management the adsorber purge will not begin. Then fuel steams start to move through the purge valve in the inlet pipeline, there they mix up with a working mix and further burn down in the usual image in combustion chambers.

For maintenance of normal work of the engine on single turns and during warming up the management block holds the valve the closed. Thus hit of not burnt down fuel in the converter (is prevented at the raised turns of idling a mix переобогащена). After warming up of the engine the valve starts to open and be closed, submitting fuel steams to an inlet path.

Diesel models

The control system of the engine functions so that to receive the maximum return from the engine at minimum the expense of fuel and toxicity of the fulfilled gases. For additional decrease in toxicity of gases on the car additional systems are established some. Ventilation system картера снижаетутечки gases in atmosphere from system of greasing of the engine. The Katalitichesky converter reduces toxicity of the fulfilled gases. The system recycling the fulfilled gases is established.

System of operated ventilation картера

For elimination of leaks of not burnt down hydrocarbons in atmosphere the engine completely герметизирован. Gases and steams of oil formed in картере, through the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases leave from картера for the account of a difference of pressure in картере and the inlet pipeline (pressure in картере above). On all diesel models the ventilation valve is established. It is on a cover of a head of the block and operates a stream of gases from картера.

System recycling the fulfilled gases

On all diesel models the system recycling the fulfilled gases also is established. This system allows to lower quantity NO x in the fulfilled gases. For this purpose the small part of the fulfilled gases moves in the inlet pipeline through the special valve. The system valve recycling is supervised by the management block.