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





(b) While holding port B closed, blow air (1.76 kPa, 18 gf/sq.cm 0.26 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 no flow from port C.





(d) Apply vacuum (3.43 kPa, 25.7 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 a port C is released.





(e) While holding port C closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 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.
7. REINSTALL CHARCOAL CANISTER