Emission Control System — Evaporative Emission Controls — Troubleshooting Flowchart (cont'd)
6-95flowchart1
(From page 6-94)
2
Does vacuum appear on gauge within 1 minute?
YES
Evaporative emission controls are OK.
NO
3
Check the charcoal canister for signs of damage or defects.
4
Is the canister OK?
NO
Replace the canister.
YES
5
Disconnect #7 hose from the purge control diaphragm valve.
6
Connect a vacuum pump to the canister "purge" fitting and apply vacuum.
7
Does it hold vacuum?
NO
same as step 4
YES
8
Reconnect #7 hose.
9
Does "purge" side vacuum drop to zero?
NO
same as step 4
YES
See two-way valve test (page 6-100).