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. DISCONNECT EVAP HOSES AND CONNECTORS
(a) Disconnect the EVAP hoses from the charcoal canister and VSV.
(b) Disconnect the 2 connectors from the VSV.
5. REMOVE VSV ASSEMBLY
6. REMOVE CHARCOAL CANISTER





7. VISUALLY INSPECT CHARCOAL CANISTER Look for cracks or damage.
8. CHECK FOR CLOGGED FILTER, AND STUCK CHECK VALVE AND DIAPHRAGM
(a) Install a plug to port E.





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





(c) While holding port B and port D closed, blow air (1.76 kPa,
18 gf/sq.cm, 0.26 psi) into port A and check that air does not
flow from port C. a





(d) Apply vacuum (3.43 kPa, 26 mm Hg, 1.01 in.Hg) to port B, check that the vacuum does not decrease when port C is closed, and check that the vacuum decreases when port C is released.





(e) While holding port C closed, apply vacuum (1.23 kPa, 9.2 mm Hg, 0.36 in.Hg) to port A and check that air flows into port B.
If a problem is found, replace the charcoal canister.
(f) Remove the plug.
9. INSPECT VSV FOR EVAP
10. INSPECT VSV FOR VAPOR PRESSURE SENSOR
11. INSPECT VAPOR PRESSURE SENSOR
12. REINSTALL VSV ASSEMBLY
13. REINSTALL CHARCOAL CANISTER
14. RECONNECT EVAP HOSES AND CONNECTORS