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Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 2779 (Engine Controls - Self-Diagnostics Introduction - CNG, Flex-Fuel & Gasoline) >> System Tests (Evaporative Emission) >> Test B: DTC P0455: Major Leak Or No Flow Detected In EVAP System Or DTC P1443: Very Small Or No Purge Flow Detected In EVAP System >> All Others

All Others

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  1. 1) Check For DTC P0455 Or P1443

    If DTC P0455 is present, go to next step. If DTC P0455 is not present, go to step  3).

  2. 2) Visually Check For Gross EVAP System Leaks

    Check for presence of a fuel filler cap. DO NOT tighten or check for correct installation at this time. Ensure input port vacuum and EVAP return tube are connected to EVAP canister purge valve. Ensure canister vent solenoid is properly seated on EVAP canister. Check for damaged fuel tank or fuel filler pipe. Check for disconnected or cracked fuel vapor hoses or tubes between intake manifold and the following components:
    • EVAP Canister Purge Valve
    • EVAP Canister
    • Fuel Vapor Vent Valve Assembly
    • Fuel Vapor Control Valve Tube Assembly (If Equipped)

    If no concerns are found, go to next step. If a concern was found, repair or replace component as necessary and go to next step.

  3. 3) Check For EVAP System Leaks

    Disconnect EVAP return tube from intake manifold and plug EVAP return tube. Connect Evaporative Emissions System Leak Tester (134-00056) to EVAP test port. EVAP test port is located on EVAP canister purge valve or on EVAP canister purge outlet tube near EVAP canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system pressure stays more than 8 in. H2O (1.99 kPa), go to next step. If EVAP system pressure drops to less than specification, verify fuel filler cap is installed correctly. Repair or replace as necessary. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  4. 4) Check For Blockage Between EVAP Canister Purge Valve & Fuel Vapor "T" Fitting

    Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2O (3.48 kPa). Open canister vent solenoid. If pressure drops immediately, go to next step. If pressure does not drop immediately, replace vapor line between canister purge valve and fuel vapor "T" fitting. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  5. 5) Check For Blockage Between Fuel Filler Pipe & Fuel Vapor "T" Fitting

    Connect evaporative emissions system leak tester to fuel filler pipe. Pressurize EVAP system to 26-28 in. H2O (6.47-6.97 kPa). If pressure drops immediately, go to next step. If pressure does not drop immediately, replace fuel tank vapor line(s). Repeat step  5) to verify repair. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .

  6. 6) Check For Failed EVAP Canister Purge Valve Or Fuel Tank Pressure Sensor

    If DTC P0455 and/or P1443 are present, replace EVAP canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If no leak is detected, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE . If DTCs P0455 and P1443 are not present, replace fuel tank pressure sensor. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .
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