Audi A4, S4

since 2000 of release

Repair and car operation



Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
+ Systems of cooling, heating and 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. Turbokompressor
      Removal and installation of system of release. Replacement of the central, additional exhaust silencer, trailer pipe
      Correction of laying of system of release / trailer pipe
      Systems of decrease in toxicity of release - the general information
      Catalytic converter
      Removal and installation of the catalytic converter and lambda probes
      Turbokompressor - the general information and precautionary measures
      Interkuler - the general information
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


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Systems of decrease in toxicity of release - the general information

Scheme of connection of vacuum lines. Engine of 1.8 l

1 — an EVAP system Adsorber
2 — From a fuel tank
3 — the Valve of management of a purge of an adsorber of EVAP
4 — the Control valve of depression in EVAP adsorber
5 — an air purifier Casing
6 — Turbokompressor
7 — the Valve of management of 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 — the Vacuum distributor "T"
15 — the Vacuum control valve
16 — Ø/m the valve of an additional admission of air

17 — case Ventilation
18 — the Vacuum control valve
19 — To the pump of definition of leaks
20 — the Vacuum control valve
21 — a turbokompressor Cooler
22 — the Module of management of the butterfly valve valve
23 — the Valve of a retsirkulyatsiya of a turbokompressor
24 — the Inlet air line
25 — Э / the motor of the pump of an additional admission of air
26 — the GUR Switch
27 — the Module of management of the butterfly valve valve
28 — the Valve of management of a purge of an adsorber of EVAP
29 — the Sensor of pressure of forced air

Cхема of connection of vacuum lines. V6 engine

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 purifier Casing
8 — the Inlet air line
9 — an EVAP system Adsorber
10 — the Valve of management of a purge of an adsorber of EVAP

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

Petrol models

In power supply systems of all petrol models only unleaded gasoline should be used. The control system of the engine functions so that to receive the maximum return from the engine at the minimum fuel consumption and toxicity of the fulfilled gases. The catching system паров fuels prevents hit them from a fuel tank in the atmosphere. The system of a retsirkulyatsiya of the fulfilled gases is established.

System of ventilation of a case

For elimination of leakages of not burned down hydrocarbons in the atmosphere the engine is completely pressurized. Gases and pairs of oil which are forming in a case, via the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases are removed from a case at the expense of a pressure difference in a case and the inlet pipeline (pressure in a case is higher).

Catalytic converter

For decrease in number of harmful emissions the three-functional catalytic converter is built in the atmosphere on all petrol models in system of release. The control system of injection of fuel has feedback in which it is included a lambda probe. This sensor established in system of release, constantly informs the control unit on composition of the fulfilled gases. Depending on the received data, the control unit corrects quality of the mix submitted to chambers of combustion and, thus, optimizes fuel combustion.

In a lambda probe the heating element which is switched on by the control unit through the special relay is built in. The working surface a lambda probe is sensitive to change of the content of oxygen in gases. Depending on concentration of oxygen, the sensor sends signals of different tension. If the mix переобогащена - the content of oxygen in the fulfilled gases very low, the sensor submits signals with a low voltage. Tension increases in process of pauperization of a mix and increase in the content of oxygen in gases. Most effectively the converter works at optimum quality of gas mixture (14.7 parts of air for 1 part of fuel). At optimum concentration of oxygen in the fulfilled gases there is a jump in tension on the sensor. This jump is a reference point for the control unit at correction of quality of a mix.

It is established on two sensors. One - before, and the second — after the converter. It reaches more exact tracking of composition of the fulfilled gases.

System of a retsirkulyatsiya of the fulfilled gases

The system of a retsirkulyatsiya of the fulfilled gases allows to reduce quantity of NOx in the fulfilled gases. For this purpose the small part of the fulfilled gases moves in the inlet pipeline via the special valve. The valve of system of a retsirkulyatsiya copes the control unit.

Catching system паров fuels

Lines of system of catching паров fuels. Engine of 1.8 l

1 — the Vacuum control valve
2 — the Valve of management of a purge of an adsorber of EVAP
3 — the Final pipeline from the valve of management of a purge of an adsorber of EVAP
4 — the Final pipeline from the gravitational valve
5 — an EVAP system 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 — the Vacuum distributor "T"
13 — the Module of management of the butterfly valve valve

Lines of system of catching паров fuels. V6 engine

1 — the Module of management of the butterfly valve activator
2 — the Valve of management of a purge of an adsorber of EVAP
3 — the Final pipeline from the valve of management of a purge of an adsorber of EVAP
4 — the Final pipeline from the gravitational valve
5 — an EVAP system 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 butterfly valve activator
10 — Vacuum connection of "T"

For decrease in emission in the atmosphere of not burned down hydrocarbons on all petrol models the system of catching of fuel is established. The refueling mouth of a fuel tank is tightly closed by a cover, under a fuel tank the coal adsorber is established. In it pairs of fuel which are forming in a tank during parking of the car gather, and are stored there until on a signal of the control unit the adsorber purge will not begin. Then pairs of fuel start to move via the purge valve in the inlet pipeline, there they mix up with a working mix and further burn down usually in combustion chambers.

For ensuring normal operation of the engine on single turns and during warming up the control unit holds the valve the closed. Thus hit of not burned down fuel in the converter (is prevented at the raised turns of idling a mix переобогащена). After engine warming up the valve starts to open and be closed, submitting pairs of fuel to an inlet path.

Diesel models

The control system of the engine functions so that to receive the maximum return from the engine at the minimum fuel consumption and toxicity of the fulfilled gases. For additional decrease in toxicity of gases on the car some additional systems are established. System of ventilation of a case of a snizhayetutechka of gases in the atmosphere from system of greasing of the engine. The catalytic converter reduces toxicity of the fulfilled gases. The system of a retsirkulyatsiya of the fulfilled gases is established.

System of operated ventilation of a case

For elimination of leakages of not burned down hydrocarbons in the atmosphere the engine is completely pressurized. Gases and pairs of oil which are forming in a case, via the mesh filter get to the inlet pipeline and burn down in cylinders together with fuel.

Gases are removed from a case at the expense of a pressure difference in a case and the inlet pipeline (pressure in a case is higher). 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 a case.

System of a retsirkulyatsiya of the fulfilled gases

On all diesel models the system of a retsirkulyatsiya of the fulfilled gases is also established. This system allows to reduce quantity of NO x in the fulfilled gases. For this purpose the small part of the fulfilled gases moves in the inlet pipeline via the special valve. The valve of system of a retsirkulyatsiya is supervised by the control unit.