Subaru Legacy

since 1990-1998 release

Repair and operation of the car

Subaru of Legasi
+ 1.1. Identification numbers
+ 2. Maintenance
+ 3. Engines
+ 4. Heating, ventilation
+ 5. Fuel system
- 6. Exhaust system
   6.1. Service of final system
   - 6.2. Reduction of toxicity of exhaust gases and management of operation of the engine
      6.2.1. Technical characteristics
      6.2.2. System of self-diagnostics (OBD) and codes
      6.2.3. Block of electronic control (ECM)
      6.2.4. Sensor of temperature of cooling liquid
      6.2.5. Sensor of provision of a butterfly valve
      6.2.6. Sensors of a cranked shaft, camshaft, car speed
      6.2.7. Oxygen sensor
      6.2.8. Air stream sensor
      6.2.9. Detonation sensor
      6.2.10. Pressure sensor in an inlet collector
      6.2.11. Replacement of the sensor of temperature of cooling liquid
      6.2.12. Replacement of the sensor of a stream of air
      6.2.13. Replacement of the sensor of oxygen
      6.2.14. Replacement of the sensor of provision of a butterfly valve
      6.2.15. Replacement of the sensor of an angle of rotation of a cranked shaft
      6.2.16. Replacement of the sensor of provision of a camshaft
      6.2.17. Replacement of the sensor of a detonation
      6.2.18. Replacement of the sensor of speed of the car
      6.2.19. Replacement of the sensor of pressure
      6.2.20. System of repeated burning of exhaust gases (EGR)
      6.2.21. System of catching of vapors of fuel (EVAP)
      6.2.22. System of compulsory ventilation of a case (PCV)
      6.2.23. Catalyst
+ 7. Systems of start, ignition
+ 8. Transmissions
+ 9. Coupling, shaft
+ 10. Brake system
+ 11. Suspension bracket
+ 12. Steering
+ 13. Body
+ 14. Electric equipment

6.2.22. System of compulsory ventilation of a case (PCV)

GENERAL INFORMATION

Chart of system of compulsory ventilation of a case

The chart of system of compulsory ventilation of a case of the engine with a turbocharger

The system of compulsory ventilation of a case (PCV) serves for reduction of emission of hydrocarbons by removal of vapors from an engine case. It is carried out by supply of atmospheric air from the air filter in an engine case where it mixes up with the gases which are available there and then comes back via the valve of system to an inlet collector.

The main details of PCV system is a valve of PCV system, hoses for atmospheric air and the vacuum hoses connecting details of system to the engine.

For ensuring normal operation of the engine idling the valve of PCV system blocks a stream in the presence of high depression in an inlet collector. At violations in work (for example, at defects of piston rings) the system serves for branch of more significant amount of the broken gases through an opening for ventilation of a case in the air filter, than it happens at a normal amount of a compression.