Valve Operation and Air Flow
WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
In the illustration below, divided by the diaphragm, the part above X is charged with atmospheric air pressure, and the part below X is charged with tank pressure. Also, the part above Y is charged with tank pressure, and the part below Y is charged with canister pressure.
If the atmospheric air pressure port is A, tank pressure port is B, and canister pressure port is C, the airflows according to pressure difference from each port as shown in the table below.
AIR PRESSURE REFERENCE CHART
| Condition of pressure | Flow |
|---|---|
| A < B (solenoid OFF) | B → C |
| B < C (solenoid OFF) | C → B |
| Solenoid ON | B ↔ C |