Subaru Legacy

since 1990-1998 release

Repair and operation of the car

Subaru Legacy
+ 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 bent 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 bent shaft
      6.2.16. Replacement of the sensor of position of the 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 combustion 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 system valve to an inlet collector.

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

For ensuring normal operation of the engine idling the valve of the PCV system blocks a stream in the presence of high depression in an inlet collector. At violations (for example, at defects of piston rings) the system serves in work for withdrawal 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.