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

  1. Check For Visual Cause Of Excessive Fuel Tank Vacuum -  Check for kinks or bends in fuel vapor hoses and tubes. Inspect canister vent solenoid inlet port for contamination or foreign material. Check canister vent solenoid for blockage or contamination. If any conditions are present, repair or clean as necessary and go to next step. If no conditions are present, go to next step.

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

    Disconnect and plug EVAP return tube at intake manifold. Connect Evaporative Emissions System Leak Tester (134-00056) or equivalent to EVAP test port. Pressurize system to 3.48 kPa (14 In. H2O). If pressure drops immediately, go to next step. If pressure does not drop immediately, go to TEST D .

  3. Check For Blockage Between Fuel Filler Pipe & Fuel Vapor Control Valve Tube

    Move EVAP Tester to fuel filler pipe. Pressurize system to 3.48 kPa (14 In. H2O). If pressure drops immediately, go to next step. If pressure does not drop immediately, go to TEST D .

  4. Check For Fuel Tank Pressure Sensor PID Without Pressure Applied

    Disconnect EVAP canister outlet tube from fuel vapor control valve tube. Turn ignition switch to ON position. Using scan tool, access PCM PID FTP V. Record reading. If PCM PID FTP V is 2.40-2.80 volts, go to next step. If PCM PID FTP V is not as specified, go to See TEST HX  under SYSTEM TESTS.

  5. Check for Stuck Open EVAP Canister Purge Valve At Idle

    Reconnect EVAP canister outlet tube. 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. Access PCM PIDs FTP V and EVAPPDC. Start engine and allow to idle. If when EVAPPDC PID is zero, FTP V PID is less than 2.40 volts, replace EVAP canister purge valve. Perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES  under ADDITIONAL SYSTEM FUNCTIONS. If when EVAPPDC PID is zero, FTP V PID is 2.40 volts or more, perform evaporative emissions system leak test. See EVAPORATIVE EMISSIONS SYSTEM LEAK TEST . If system passes, perform EVAPORATIVE EMISSIONS REPAIR VERIFICATION DRIVE CYCLE. See DRIVE CYCLE PROCEDURES  under ADDITIONAL SYSTEM FUNCTIONS.
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