Evaporative Emission Control Canister: Testing and Inspection

1. Remove charcoal canister.
2. Inspect canister for cracks or damage. Replace canister, if necessary.
3. Check operation of purge control valve as follows:

Fig. 5 Applying pressure to purge control valve:

a. Apply approximately 14 psi (50 kPa) to port marked V.C., Fig. 5. No air should leak from diaphragm.

Fig. 6 Applying vacuum to purge control valve:

b. Apply approximately 14.96 inches Hg vacuum to port marked PURGE and maintain vacuum, Fig. 6.
c. Apply vacuum gradually to the port marked V.C. If the purge control valve begins to open (vacuum gauge reading on the PURGE port decreases) at a pressure between 1.6 and 3.2 inches Hg vacuum, the purge control valve is functioning normally. 4. If valve operation is not as specified, replace charcoal canister.