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Pinpoint Test B: DTC P0455 Major Leak Or No Flow Detected Or DTC P1443 Very Small Or No Purge Flow Detected In System

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NOTE: Condition DTC P0455 set: -1.74 kPa (-7.0 inches H2O) over 30 seconds.
NOTE: Condition DTC P1443 set: -1.74 kPa (-7.0 inches H2O) over 30 seconds with more than 0.02 lb/min vapor flow.
  1. B1 CHECK FOR DIAGNOSTIC TROUBLE CODE P0455 OR P1443 
    • Use the recorded results from the PCM DTCs.
    • Is DTC P0455 or P1443 present? 
      1. Yes  : GO to B2.
      2. No  : GO to  B3.
  2. B2 VISUALLY CHECK FOR GROSS EVAP SYSTEM LEAKS 
    • Check for the presence of a fuel filler cap. Do not tighten or check for correct installation at this time.
    • Check the input port vacuum and EVAP return tube are connected to the EVAP canister purge valve.
    • Check that the canister vent solenoid hose is correctly attached to the canister vent solenoid.
    • Check for disconnected or cracked fuel vapor hoses or tubes between the intake manifold and following components:
      • EVAP canister purge valve
      • EVAP canister
      • fuel vapor vent valve assembly
      • fuel vapor control valve tube assembly
    • Check for damaged fuel tank or fuel filler pipe.
    • Is a concern with a hose, tube, connection or valve visually evident? 
      1. Yes  : REPAIR or INSTALL new EVAP components as necessary. GO to B3.
      2. No  : GO to B3.
  3. B3 CHECK FOR EVAP SYSTEM LEAKS 
    • Disconnect the EVAP return tube from the intake manifold and plug the EVAP return tube.
    • Connect the Evaporative Emissions System Leak Tester to the EVAP test port.
    • Carry out the evaporative emissions system leak test. Refer to EVAPORATIVE EMISSION SYSTEM LEAK TEST .
    • Does the system pressure stay above 1.99 kPa (8 inches H2O)? 
      1. Yes  : GO to B4.
      2. No  : VERIFY that the fuel filler cap is installed correctly. REPAIR or INSTALL new components as necessary. CARRY OUT the evaporative emission system leak test. REFER to EVAPORATIVE EMISSION SYSTEM LEAK TEST . If the system passes the leak test, CARRY OUT the evaporative emission repair verification drive cycle. REFER to EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE .
  4. B4 CHECK FOR BLOCKAGE BETWEEN THE EVAP CANISTER PURGE VALVE AND CANISTER VENT SOLENOID 
  5. B5 CHECK FOR BLOCKAGE BETWEEN FUEL FILLER PIPE AND THE FUEL VAPOR CONTROL VALVE TUBE ASSEMBLY 
  6. B6 CHECK FOR FAILED EVAP CANISTER PURGE VALVE OR FUEL TANK PRESSURE SENSOR 
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