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Pinpoint Test C: DTC P1450 Excessive Vacuum Detected In The Fuel Tank

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Condition P1450 DTC set: more than -1.79 kPa (-7.2 inches H2 O) over 30 seconds.

Test Step 

  1. C1 CHECK FOR VISUAL CAUSES OF EXCESSIVE FUEL TANK VACUUM 
    • Check for kinks or bends in the fuel vapor hoses and tubes.
    • Visually check the EVAP canister inlet port, canister vent solenoid, EVAP dust separator or outlet hose for contamination or foreign material.
    • Check the canister vent solenoid for blockage or contamination.
    • Is a concern with a hose, tube, connection or component visually evident? 

    Result/Action to Take 

    1. Yes  : REMOVE any contamination or foreign material around fuel vapor hoses and tubes. REPAIR the hoses, tubes or components as necessary. After all visual concerns are repaired, GO to C2.
    2. No  : GO to C2.
  2. C2 CHECK FOR BLOCKAGE BETWEEN EVAP TEST PORT AND CANISTER VENT SOLENOID 
    • Disconnect and plug the EVAP return tube at the intake manifold.
    • Connect the Evaporative Emissions System Tester to the EVAP test port.
    • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
    • Does the pressure drop immediately? 
    1. Yes  : GO to C3.
    2. No  : Go To PINPOINT TEST D: HISS WHEN OPENING FUEL CAP .
  3. C3 CHECK FOR BLOCKAGE BETWEEN THE FUEL FILLER PIPE AND THE FUEL VAPOR TEE 
    • Connect the Evaporative Emission System Tester to the fuel filler pipe.
    • Pressurize the EVAP system to 3.48 kPa (14 inches H2 O).
    • Does the pressure drop immediately? 
    1. Yes  : GO to C4.
    2. No  : Go To PINPOINT TEST D: HISS WHEN OPENING FUEL CAP .
  4. C4 CHECK FOR FUEL TANK PRESSURE SENSOR PID WITHOUT PRESSURE APPLIED 
    • Disconnect the EVAP canister outlet tube at the EVAP canister.
      Fig 1: Disconnecting EVAP Canister Outlet Tube At EVAP Canister
      G03275278Courtesy of FORD MOTOR CO.
    • Key in ON position.
    • Access PCM PID FTP V.
    • Record the reading.
    • Is PID FTP V reading between 2.40 and 2.80 volts? 
    1. Yes  : GO to C5.
    2. No  : REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE article to continue diagnosis.
  5. C5 CHECK FOR STUCK OPEN EVAP CANISTER PURGE VALVE CONDITION AT IDLE 
    • Connect the EVAP canister outlet tube.
      Fig 2: Connecting EVAP Canister Outlet Tube
      G03275279Courtesy of FORD MOTOR CO.
    • Remove the plug from the EVAP return tube and reconnect the tube to the intake manifold.
    • Verify that the fuel filler cap is correctly installed.
    • Key in ON position.
    • Access PCM PIDs FTP V and EVAPPDC.
    • Start the engine and allow to idle.
    • Monitor the FTP V and EVAPPDC PIDs.
    • When PID EVAPPDC is zero, is PID FTP V reading below 2.40 volts? 
    1. Yes  : INSTALL a new EVAP canister purge valve. REFER to EVAPORATIVE EMISSION CANISTER PURGE VALVE . CARRY OUT an EVAP system leak test. Refer to EVAPORATIVE EMISSION SYSTEM LEAK TEST . If the system passes the leak test, CARRY OUT an evaporative emissions repair verification drive cycle. REFER to EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .
    2. No  : CARRY OUT the EVAP system leak test. Refer to EVAPORATIVE EMISSION SYSTEM LEAK TEST . If the system passes the leak test, CARRY OUT the evaporative emissions repair verification drive cycle. REFER to EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .
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