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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4S >> Repair and Diagnosis >> External Pages >> Different car >> Section 1838 (Engine Controls Self-Diagnostics - EEC-V - CNG & Gasoline - System Tests (Evaporative Emissions)) >> System Tests (Evaporative Emissions) >> 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 >> Focus

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: Focus

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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) 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 in EVAP canister. 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 Valve Tube Assembly

    If no problems are found, go to next step. If a problem was found, repair or replace component as necessary and perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed.

  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 outlet tube near canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system pressure stays more than 8 in. H2 O (1.99 kPa), go to next step. If EVAP system pressure drops to less than specification, go to step  8).

  4. 4) Check For Blockage At EVAP Canister Vent Solenoid Assembly

    Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2 O (3.48 kPa). Open canister vent solenoid. If pressure drops immediately, go to step  6). If pressure does not drop immediately, go to next step.

  5. 5) Check For Blockage Between EVAP Canister Purge Valve & EVAP Canister

    Disconnect and plug EVAP canister purge outlet tube from EVAP canister. Pressurize system to 14 in. H2 O (3.48 kPa). Remove plug from EVAP canister purge outlet tube. If pressure drops immediately, perform appropriate test under EVAPORATIVE EMISSION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - EEC-V - GASOLINE. If pressure does not drop immediately, remove blockage from EVAP canister purge valve outlet tube. If necessary, replace EVAP canister purge outlet tube assembly and go to TEST A, step  4).

  6. 6) Check For Blockage Between EVAP Test Port & Fuel Tank

    Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2 O (3.48 kPa). Remove fuel filler cap. If pressure drops immediately, go to step  14). If pressure does not drop immediately, go to next step.

  7. 7) Check For Blockage Between Fuel Tank & EVAP Canister Tube

    Ensure ignition switch is turned to ON position. Connect evaporative emissions system leak tester to fuel filler pipe. Disconnect and plug EVAP canister tube from fuel tank between EVAP canister purge valve and EVAP canister. Pressurize system to 26-28 in. H2 O (6.47-6.97 kPa). Remove plug from EVAP canister tube. If pressure drops immediately, replace EVAP canister tube and go to step  14). If pressure does not drop immediately, perform HISS WHEN OPENING FUEL CAP symptom test under EVAPORATIVE EMISSION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - EEC-V - GASOLINE.

  8. 8) Check For Large Leak At Fuel Filler Cap

    Connect evaporative emissions system leak tester to fuel filler pipe and install fuel cap. Turn ignition switch to ON position. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Pressurize EVAP system to 14 in. H2 O (3.48 kPa). Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . Using ultrasonic leak detector, check fuel filler cap. If no leak is detected, go to next step. If leak is detected, replace fuel filler cap and repeat step  8) to verify repair. When system passes, perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed.

  9. 9) Check For Leak At EVAP Canister & Canister Vent Solenoid

    Plug canister vent hose assembly. Connect evaporative emissions system leak tester to EVAP test port. Pressurize system to 14 in. H2 O (3.48 kPa). Using ultrasonic leak detector, slowly check EVAP canister and canister vent solenoid. If no leak is detected, go to next step. If leak is detected, repair or replace leaking component as necessary. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . When system passes, perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed.

  10. 10) Check For Leak Between EVAP Test Port & EVAP Canister

    Disconnect EVAP canister tube from tube leading to fuel tank and plug EVAP canister side of of fitting. Close canister vent solenoid. See CANISTER VENT SOLENOID CLOSING PROCEDURE . Connect evaporative emissions system leak tester to EVAP test port. Pressurize EVAP system to 14 in. H2 O (3.48 kPa). Using ultrasonic leak detector, slowly check components from EVAP return tube to EVAP canister tube. If leak is detected, repair or replace fuel vapor hoses or tubes as necessary and go to next step. If no leak is detected, go to step  12).

  11. 11) Check Repairs Between EVAP Test Port & EVAP Canister

    Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes leak test, go to step  14). If system does not pass leak test, go to next step.

  12. 12) Check For Leak From Fuel Tank To EVAP Canister Tube

    Remove plug installed in step  10) from EVAP canister side of fitting, and install onto fuel tank side of fitting. Connect evaporative emissions system leak tester to fuel filler pipe. Pressurize system to 26-28 in. H2 O (6.47-6.97 kPa). Using ultrasonic leak detector, slowly check the following components:
    • Fuel Filler Pipe
    • Fuel Tank
    • Fuel Vapor Vent Valve
    • Fuel Vapor Control Valve
    • Fuel Vapor Control Valve Tube
    • Fuel Tank Pressure Sensor
    • EVAP Canister Tube

    If leak is detected, repair or replace component as necessary and go to next step. If a leak is not detected, perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes leak test, go to step  14).

  13. 13) Check Repairs Between Fuel Tank & EVAP Canister

    Pressurize system to 14 in. H2 O (3.48 kPa). Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes leak test, go to next step. If system does not pass leak test, go to step  12).

  14. 14) Check For Fuel Tank Pressure Sensor Operation With Fuel Filler Cap Removed

    Ensure battery is fully charged. Remove fuel filler cap. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Using scan tool, select PCM FTP V PID from PID/DATA MONITOR & RECORD menu. If FTP V PID is 2.40-2.80 volts, go to next step. If FTP V PID is not within specification, replace fuel tank pressure sensor and repeat step  14) to verify repair.

  15. 15) Check Fuel Tank Pressure Sensor With Pressure Applied

    Connect evaporative emissions system leak tester to fuel filler pipe. Disconnect and plug canister vent hose assembly. Turn ignition switch to ON position. Using scan tool, select FTP V PID from PID/DATA MONITOR & RECORD men. Pressurize system to 14 in. H2 O (3.48 kPa). Turn ignition switch to OFF position. If FTP V PID was 4.22-4.90 volts, go to next step. If FTP V PID was not within specification, discontinue pressurizing EVAP system and return to step  14).

  16. 16) Check EVAP Canister Purge Valve Operation

    Remove plug from canister vent hose assembly and reconnect EVAP return tube to intake manifold. Start engine and allow to idle. Using scan tool, select EVAPPDC and FTP V PIDs. Alow engine to stay running until PCM PID EVAPPDC reaches a duty cycle of 40 percent or more. If FTP V PID is less than 2.6 volts (zero in. H2 O), perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed. If FTP V PID is not as specified, go to next step.
    17. NOTE: At high elevations, intake manifold vacuum reading at input port vacuum hose and EVAP return tube must be 10 in. Hg (33.77kPa) or more.

  17. 17) Check For Intake Manifold Vacuum At EVAP Canister Purge Valve
    Disconnect input port vacuum hose and EVAP return tube from EVAP canister purge valve. Connect vacuum gauge to input port vacuum hose and plug open end of EVAP return tube. Start engine and allow to idle. Record vacuum measurement. Turn ignition switch to OFF position. Move vacuum gauge to EVAP return tube and plug input port vacuum hose. Start engine and allow to idle. Record vacuum measurement.

    If both measurements are 14-20 in. Hg (47.25-67.54 kPa), replace EVAP canister valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes leak test, perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed. If both measurements are not as specified, check for blockages in input port vacuum hose or EVAP return tube. Check intake manifold vacuum lines or ports for blockage. Repair or replace components as necessary. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST .

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