Emission Control System — Evaporative Emission Controls [KQ] — Troubleshooting Flowchart (cont'd)
6-98flowchartApplies to KQ model.
1
(From page 6-97)
2
Connect a vacuum gauge to canister purge air hose.
3
Start the engine and raise speed to 3,500 min-1 (rpm).
4
Does vacuum appear on gauge within 1 minute?
YES
Evaporative emission controls are OK.
NO
5
Check the charcoal canister for signs of damage or defects.
6
Is the canister OK?
NO
Replace the canister.
YES
7
Disconnect #7 hose from the purge control diaphragm valve.
8
Connect a vacuum pump to the canister "purge" fitting and apply vacuum.
9
Does it hold vacuum?
NO
same as step 6
YES
10
Reconnect #7 hose.
11
Does "purge" side vacuum drop to zero?
NO
same as step 6
YES
See two-way valve test (page 6-100).