Toyota Corolla

1992-1998 of release

Repair and operation of the car

Toyota Corolla
+ 1. Maintenance instruction
+ 2. Maintenance
+ 3. Engines
+ 4. Cooling systems, heating
+ 5. Fuel, exhaust systems
- 6. System of decrease in toxicity
   6.1. Specifications
   6.2. Electronic control system
   6.3. Electronic control unit
   + 6.4. System of onboard diagnostics
   + 6.5. Sensors of system of automatic control of the engine
   6.6. System of catching of vapors of gasoline
   6.7. System of recirculation (EGR system)
   6.8. System of compulsory ventilation of a case (PCV system)
   6.9. Catalytic converter
+ 7. Transmissions
+ 8. Coupling and half shafts
+ 9. Brake system
+ 10. Suspension bracket and steering
+ 11. Body
+ 12. Electric equipment

6.8. System of compulsory ventilation of a case (PCV system)


Structure of system of compulsory ventilation of a case

The system of compulsory ventilation of a case is intended for decrease in the content of hydrocarbons in emissions of the engine at the expense of an engine case purge with the subsequent suction of vnutrikarterny gases. The fresh air which is selected from the air filter mixes up in internal space of the engine with vnutrikarterny gases and goes through a zolotnik of system of ventilation for reburning in engine cylinders.

The main components of system are the spool-type device, the channel of selection of air and connecting hoses.

For maintenance of steady operation of the engine the spool-type device which rummages inflow of mix of vnutrikarterny gases at low depression on the soaking-up highway idling serves. At violation of normal operation of the engine (for example, at wear of piston rings) the formed many vnutrikarterny gases go via the air-channel back to the air filter for reburning in the combustion chamber.

Mix of gases and air comes to a chamber of a butterfly valve. In area near a butterfly valve later time resinous deposits are formed. These deposits should be deleted periodically.


1. For check of a zolotnik get it from a rubber cover in a cover of a head of cylinders and shake. If knock is distributed, it indicates lack of a contamination of a zolotnik by resinous deposits and its serviceability. If knock is not present, replace a zolotnik.
2. Start the engine and transfer to an operating mode idling, then apply a finger to a zolotnik. If depression is felt, the zolotnik is serviceable. If depression is not felt, either the zolotnik is faulty, or the zolotnik hose is littered. Check also leak of air in a zolotnik, a maslozalivny mouth and in other hoses.


1. Get a zolotnik. Check existence on a rubber cover of a zolotnik of cracks, hardening and mechanical damages. At detection of damages replace a cover.
2. If the zolotnik is littered, also the hose is for certain littered. Remove a hose and wash out in solvent.
3. After cleaning of a hose check existence of wear tracks and mechanical damages. Be convinced of hose prileganiye density to unions.
4. If necessary replace a zolotnik.
5. Establish the cleared zolotnik hose. Be convinced that the hose strongly adjoins to a zolotnik.