Canister Purge Control Valve: Testing and Inspection

NOTE: The Charcoal Canister and Purge Shutoff Switch are a combined unit and are not serviced separately. If the purge switch or cannister is defective the complete assembly must be replaced.

NOTE: A faulty Purge Shutoff Switch can result in increased emissions and/or poor driveability.

PURGE SHUTOFF SWITCH TEST
1. Check vacuum hoses for proper routing.
2. Remove fuel vapor hose from canister and plug.
3. Remove purge hose from intake manifold.
4. Remove vacuum signal hose from purge switch and install vacuum pump.
5. Blow on purge hose, passage should be closed. (If passage is open replace Purge Switch/Canister assembly).
6. Apply vacuum (15 in/Hg) to signal port of purge switch.
7. Blow on purge hose, passage should be clear. (If passage is closed replace Canister-Purge Switch assembly).
8. If Purge Switch is operating properly, reinstall vacuum and vapor hoses.