Test A: DTC P0442: Small Leak In EVAP System: Focus

Inspect Components For Small Leaks - Check for presence of fuel cap, but do not tighten at this time. Ensure canister vent is seated on EVAP canister. Check EVAP hoses between canister and purge valve, canister and fuel vapor vent valve and fuel vapor valve tube to fuel tank for cuts or loose connections. Check fuel filler pipe for damage. If problem was found, repair as necessary and perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. If no problems were found, go to next step.

Check EVAP Test Port

Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system does not pass leak test, go to step 4. If system passes leak test, go to next step.

Check For Small Leaks At Fuel Filler Cap & EVAP Test Port

Perform evaporative emissions system leak test with Evaporative Emissions System Leak Tester (134-00056) or equivalent attached to fuel filler pipe. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . While system is under pressure, use ultrasonic leak detector to check fuel filler cap and EVAP test port for leaks. If a leak is detected, repair or replace component perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS and go to next step. If a no leak is detected, install fuel filler cap and perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS.

Check For Small Leak With Tester Set At Fill Position

Perform evaporative emissions system leak test with EVAP Tester attached to EVAP test port and tester in FILL position. Turn ignition switch to ON position. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system holds pressure, go to next step. If system does not hold pressure, go to step 6.

Check For Small Leaks In Complete EVAP System

Repeat system test. While system is under pressure, use ultrasonic leak detector to check fuel filler cap and fuel filler hose, EVAP hoses between canister and purge valve, canister and fuel vapor vent valve and fuel vapor valve tube to fuel tank for cuts or loose connections. If leak is detected, repair as necessary. If no leak is detected, discontinue pressurizing system and go to next step.

Check For Small Leak Between EVAP Return Tube & EVAP Canister

Disconnect fuel vapor return tube at EVAP canister and plug tube. Pressurize system. While system is under pressure, use ultrasonic leak detector to check EVAP system between intake manifold and canister vent solenoid. If leak is detected, repair or replace as component necessary. Repeat step to verify repair and go to next step. If no leak is detected, go to next step.

Check For Small Leak Between EVAP Canister Tube & Fuel Filler Pipe

Move EVAP tester from EVAP test port to fuel filler pipe. Transfer plug in EVAP canister tube to fuel vapor valve tube. Ensure leak tester is in FILL position. Pressurize system. While system is under pressure, use ultrasonic leak detector to check fuel tank vapor tube to fuel tank. Check fuel tank pressure sensor, fuel vapor valve tube and fuel filler pipe. If leak is detected, repair or replace component as necessary. Repeat step to verify repair and go to next step. If no leak is detected, go to next step.

Check EVAP System At Fuel Filler Pipe

Reconnect all disconnected fittings. Complete evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system passes leak test, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. If system did not pass, repair or replace component as necessary. Repeat step to verify repair. Perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS.