Test C: DTC P1450: Excessive Vacuum Detected In Fuel Tank: Focus

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2001 Mercury Sable, 2001 Mercury Mountaineer, 2001 Mercury Grand Marquis, 2001 Mercury Cougar, and 2001 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

1) Check For Visual Cause Of Excessive Fuel Tank Vacuum

Check for kinks or bends in fuel vapor hoses and tubes. Inspect EVAP canister inlet port, canister vent solenoid filter or outlet hose for contamination or foreign material. Check canister vent solenoid for blockage or contamination. If any conditions are present, repair, replace or clean as necessary and go to next step. If no conditions are present, go to next step.

2) Check For Blockage Between EVAP Test Port & EVAP Canister Vent Solenoid

Disconnect and plug EVAP return tube at intake manifold. Plug canister vent solenoid or canister vent hose. Connect evaporative emissions system leak tester to EVAP test port. Pressurize system to 14 in. H₂ O (3.48 kPa). Remove plug from canister vent solenoid or canister vent hose. If pressure drops immediately, go to next step. 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.

3) Check Fuel Filler Cap

Connect evaporative emissions system leak tester to fuel filler pipe and install fuel filler 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). Using ultrasonic leak detector, slowly check fuel filler cap and EVAP test port. If a leak is detected, repair or replace component and repeat step 3) to verify repair. If no leak is detected, go to next step.

4) Check For Blockage Between EVAP Test Port & Fuel Tank With Fuel Filler Cap Removed

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 next step. 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.

5) Check Fuel Tank Pressure Sensor PID With Fuel Filler Cap Removed

Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Ensure fuel filler cap is removed. Turn ignition switch to ON position. Using scan tool, select PCM FTP V PID from PID/DATA MONITOR & RECORD menu. Record FTP V PID value. If FTP V PID is 2.40-2.80 volts, go to next step. If FTP V PID is not as specified, go to TEST HX, step 21) under SYSTEM TESTS.

6) Check for Stuck Open EVAP Canister Purge Valve Condition At Idle

Open canister vent solenoid. Refer to CANISTER VENT SOLENOID CLOSING PROCEDURE . Remove plug from EVAP return tube and reconnect tube to intake manifold. Ensure fuel filler cap is properly installed. Turn ignition switch to ON position. Select PCM FTP V and EVAPPDC PIDs from PID/DATA MONITOR & RECORD menu. Start engine and allow to idle. When EVAPPDC PID is zero, FTP V PID should be less than 2.40 volts. If PCM PID values are as specified, replace EVAP canister purge valve. Perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system passes leak test, perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed. If PCM PID values are not as specified, perform EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If EVAP system passes leak test, perform DRIVE CYCLE PROCEDURES under ADDITIONAL SYSTEM FUNCTIONS. Ensure PENDING CODE CHECK & EVAP MONITOR "BY-PASS" CHECK is performed.