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






6.2.21. System of catching of vapors of fuel (EVAP)

GENERAL INFORMATION

Schematical image of system of catching of vapors of fuel (EVAP)

This system serves for branch and collecting of vapors of fuel from the fuel tank, the case of a butterfly valve and an inlet collector in a canister with charcoal for reduction of their emission in the atmosphere in the form of hydrocarbons. During the operation of the engine of couple of fuel get from a canister with charcoal, the arriving air and are involved in usual process of combustion.

Unstable operation of the engine idling, bad controllability and problems at a stop of the engine can be a consequence of malfunction of the control valve, damage of a canister with coal, existence of cracks or peeling in hoses, existence of deformation and other damages.

Check

PERFORMANCE ORDER
1. Check each of the hoses connected to a canister with charcoal on displacement, existence of cracks and places of leaks on all length of a hose.
2. Check whether there is no leak of fuel from the canister bottom with coal. If there is a leak, replace a canister with coal and check hoses and their fastenings.
3. Check operation of the electromagnetic valve of cleaning. First of all check passing of vacuum from the throttle case to the cleaning valve. Disconnect a vacuum hose from the electromagnetic valve of cleaning and install the manometer on a hose. Increasing engine turns, check that the vacuum shown by the manometer increases.
4. Check resistance of the electromagnetic valve of cleaning which has to make 10–100 Ohms.





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