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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2779 (Engine Controls - Self-Diagnostics Introduction - CNG, Flex-Fuel & Gasoline) >> System Tests (Evaporative Emission) >> Test A: DTC P0442, P0456 Or P0457: Small Leak Detected In EVAP System >> Sable & Taurus

Sable & Taurus

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  1. 1) Visually Inspect Components For Small Leaks

    Check for presence of fuel filler cap, but DO NOT tighten or check for proper installation at this time. Ensure canister vent solenoid is fully seated on EVAP canister. Check EVAP hoses between EVAP canister and EVAP canister purge valve, fuel vapor control valve tube and fuel tank, and EVAP canister and fuel vapor vent valve for cuts or loose connections. Check fuel filler pipe for damage. If no concerns were found, go to next step. If concern was found, repair or replace component as necessary and go to next step.

  2. 2) Check EVAP Test Port For Small System Leaks

    Disconnect and plug EVAP emission return tube at intake manifold. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system does not pass leak test, go to step  4). If system passes leak test, go to next step.

  3. 3) Visually Inspect Fuel Filler Cap

    Visually inspect fuel filler cap for damage. If fuel filler cap is okay, go to next step. If fuel filler cap is damaged, replace fuel filler cap and go to next step.

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

    Connect Evaporative Emissions System Leak Tester (134-00056) to fuel filler pipe. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2O (3.48 kPa). 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 components as necessary and go to next step. If no leak is detected, reinstall fuel filler cap and perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  5. 5) Check For Concern Other Than Fuel Filler Cap

    Refer to previous test results. If EVAP system did not pass EVAPORATIVE EMISSIONS SYSTEM LEAK TEST performed in step  2), go to next step. If EVAP system passed EVAPORATIVE EMISSIONS SYSTEM LEAK TEST performed in step  2), repeat EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system now passes leak test, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  6. 6) Check For Small Leak With Tester Set At Fill Position

    Connect evaporative emissions system leak tester to EVAP test port. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Set selector on evaporative emissions system leak tester to FILL position. Pressurize EVAP system to 14 in. H2O (3.48 kPa). If EVAP system pressure is 13.80-14.20 in. H2O (3.43-3.53 kPa), go to next step. If system does not hold pressure within specification, release pressure in EVAP system and go to step  8).

  7. 7) Check For Leaks In Complete EVAP System

    Ensure evaporative emissions system leak tester is connected to EVAP test port. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2O (3.48 kPa). While system is under pressure, use ultrasonic leak detector to check the following EVAP system locations:
    • EVAP Return Tube To EVAP Canister Purge Valve
    • EVAP Canister Purge Valve To EVAP Canister (Canister Vent Solenoid Assembly)
    • EVAP Canister (Canister Vent Solenoid Assembly) To Fuel Tank
    • Fuel Filler Cap & Fuel Filler Tube

    If no leak is detected at any location, release pressure from EVAP system and go to next step. If a leak is detected at any location, repair or replace component as necessary. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  8. 8) Check For Small Leak Between EVAP Return Tube To EVAP Canister

    Disconnect fuel vapor valve tube from EVAP canister. Plug opening in vapor tube leading to EVAP canister. Connect evaporative emission system leak tester to EVAP test port. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2O (3.48 kPa). While system is under pressure, use ultrasonic leak detector to check EVAP system from intake manifold to EVAP canister purge outlet tube. If no leak is detected, open canister vent solenoid and go to next step. If leak is detected, repair or replace component as necessary. Repeat step  6) to verify repair and go to next step.

  9. 9) Check For Small Leak Between Fuel Vapor Valve Tube & Fuel Filler Pipe

    Connect evaporative emission system leak tester to fuel filler pipe. Transfer plug from vapor tube leading to EVAP canister to fuel vapor valve tube. Set selector on evaporative emissions system leak tester to FILL position. Pressurize EVAP system to 14 in. H2O (3.48 kPa). While system is under pressure, use ultrasonic leak detector to check fuel tank vapor tube to fuel tank for leaks. Check fuel tank pressure sensor, fuel vapor valve tube and fuel filler pipe. If no leak is detected, go to next step. If any leak is detected, repair or replace component as necessary and go to next step.

  10. 10) Check EVAP System At Fuel Filler Pipe

    Reconnect fuel vapor valve tube to EVAP canister. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system passes leak test, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE . If EVAP system did not pass leak test, repeat step  6).
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