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. VISUALLY INSPECT CHARCOAL CANISTER Look for cracks or damage.
7. 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, 22mm Hg, 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.
8. INSPECT VSV FOR EVAP
9. INSPECT VSV FOR VAPOR PRESSURE SENSOR
10. INSPECT VAPOR PRESSURE SENSOR

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