Evaporative Emissions System: Testing and Inspection

INSPECTION

1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loose connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks or fuel leakage.





3. VISUALLY INSPECT FUEL TANK CAP
Check if the cap and/or gasket are deformed or damaged. If necessary, repair or replace the cap.
4. REMOVE CHARCOAL CANISTER
5. REMOVE VSV FOR EVAP
6. REMOVE VSV FOR VAPOR PRESSURE SENSOR





7. VISUALLY INSPECT CHARCOAL CANISTER
Look for cracks or damage.
8. CHECK FOR CLOGGED FILTER, AND STUCK CHECK VALVE AND DIAPHRAGM
(a) Install the plugs to ports A and B.





(b) While holding port C closed, blow air (1.47 kPa, 15 gf/sq.cm, 0.21 psi) into port D and check that air flows from port E.





(c) While holding port C and port E closed, blow air (1.47 kPa, 15 gf/sq. cm, 0.21 psi) into port D and check that air does not flow from port F.





(d) Apply vacuum (2.94 kPa, 22 mmHg, 0.87 in.Hg) to port C, check that the vacuum does not decrease when port F is closed, and check that the vacuum decreases when port F is released.





(e) While holding port F closed, apply vacuum (2.94 kPa, 22 mm Hg, 0.87 in.Hg) to port D,check that the vacuum does not decrease when port C is closed, and check that the vacuum decreases when port C is released.
If a problem is found, replace the charcoal canister.
(f) Remove the plugs.
9. INSPECT VSV FOR EVAP
Canister Purge Solenoid

10. INSPECT VSV FOR VAPOR PRESSURE SENSOR
Leak Detection Solenoid

11. INSPECT VAPOR PRESSURE SENSOR
Evaporative Vapor Pressure Sensor

12. REINSTALL CHARCOAL CANISTER
13. REINSTALL VSV FOR VAPOR PRESSURE SENSOR
14. REINSTALL VSV FOR EVAP