Mercedes C-Class

W203 since 2000 of release

Repair and car operation

Mercedes-Benz
+ Mercedes-Benz Cars of a class C (W-203)
+ Operation manual
+ Routine maintenance
+ Engine
+ cooling and heating Systems
- Power supply system and release
   + Power supply system of the petrol and diesel engine
   + System of injection of fuel of the petrol engine
   + System of injection of fuel of the diesel engine. Turbokompressor
   - Systems of release and decrease in toxicity of the fulfilled gases. Turbokompressor
      System of production of the fulfilled gases - general information
      Removal, installation of system of release and tightness check
      Systems of decrease in toxicity of release - the general information
      Catalytic converter
      Turbokompressor - the general information, removal and installation
      The compressor of blown air with a belt drive
      Interkuler - the general information
+ engine Electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment

На www.spetsmedpribor.net приборы +для восстановления зрения.

Systems of decrease in toxicity of release - the general information

Scheme of an arrangement of components of systems of decrease in toxicity. Models C240 and С320


1 — the Valve of management of an adsorber purge 2 — the Valve of an otsechka of a coal adsorber 3 — the Coal adsorber	4 — the pressure Sensor in a fuel tank 5 — the Fuel pump

The scheme of connection of vacuum lines (model with the engine 111 equipped with the air compressor)


1 — the Actuation mechanism of a zaslonka of a retsirkulyatsiya 2 — the Compressor of submitted air 3 — the Intermediate cooler (Intercooler) 4 — the Control valve of a podmeshivaniye of secondary air 5 — the Valve switch of the air pump 6 — the Vacuum control valve 7 — the Valve of an otsechka of secondary air 8 — the pressure Sensor	9 — the Control valve (a coal adsorber) 10 — the Valve of management of a purge of a coal adsorber 11 — the Valve of an otsechka of a coal adsorber 12 — the Coal adsorber 13 — the Ventilating valve 14 — the Valve of dumping of pressure (ORVR) 15 — the Fuel tank 16 — the Jellied mouth of a fuel tank with the socket of system of catching of fuel evaporations

The scheme of connection of vacuum lines (model with the V6 engine)


1 — Transdyuser of pressure of the EGR valve 2 — the EGR Valve 3 — the Vacuum control valve 4 — the Valve switch of geometry of the inlet pipeline 5 — the Block of switching of the inlet pipeline 6 — the Valve of an otsechka of secondary air with the built-in control valve 7 — the Electric air pump	9 — the pressure Sensor 10 — To other consumers of depression 12 — the Jellied mouth of a fuel tank with the socket of system of catching of fuel evaporations 13 — the Valve of an otsechka of a coal adsorber 14 — the Coal adsorber 15 — the Fuel tank

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 the oxygen sensor is switched on. 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 composition 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

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 filter purge will not begin. Then pairs of fuel start to move via the valve (ы) purges 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. The system of ventilation of a case reduces leakages 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 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 is supervised by the control unit.