Air Leakage Inspection
Visually/physically inspect the air leakage in intake/exhaust system as following items.
(1) If OK, go to next step.
(2) If NG, repair as necessary and go to "Verification vehicle Repair" procedure.
Vacuum hoses for splits, kinks and improper connections.
Throttle body gasket.
Gasket between intake manifold and cylinder head.
Seals between intake manifold and fuel injectors.
Exhaust system between HO2S and Three way catalyst for air leakage.
Check for air leakage in EVAP. Purge control valve.
(1) Remove the manifold side vacuum hose from the EVAP canister purge valve.
(2) Using a hand vacuum pump apply specified vacuum(Approx. 15 in, Hg) to the manifold side of the valve.
(3) Does the valve hold vacuum?
YES
▶ Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO
▶ Substitute with a known - good ISCA and check for proper operation.
If the problem is corrected, replace ISCA and go to "Verification of Vehicle Repair" procedure.
