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Home >> Acura >> 2003 >> MDX Touring >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> EVAP System >> DTC Troubleshooting >> DTC P0455: EVAP System Large Leak Detected (2003-2004 models)

DTC P0455: EVAP System Large Leak Detected (2003-2004 models)

Special Tools Required 

NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  • If DTC P0461 is stored at the same time as DTC P0455, troubleshoot P0461 first, then recheck for DTC P0455.
  1. Check the fuel fill cap installation.

    Is the correct fuel fill cap installed and properly tightened? 

    1. YES  - Go to step 2.
    2. NO  - Properly install and tighten the cap 3 clicks, then go to step  61.
  2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B).
    Fig 1: Checking Fuel Fill Cap Seal And Fuel Fill Pipe Mating Surface
    G03640063Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is the fuel fill cap seal missing or damaged, or is the fuel fill pipe damaged? 

    1. YES  - Replace the fuel fill cap or the fuel fill pipe, then go to step  61.
    2. NO  - Go to step 3.
  3. Turn the ignition switch ON (II).
  4. Clear the DTC with the HDS.
  5. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

    Is the EVAP SYSTEM normal? 

    1. YES  - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP bypass solenoid valve, the EVAP canister purge valve, or the EVAP canister vent shut valve and the PCM.
    2. NO  - Go to step 6.
  6. Go to the appropriate step based on the tester's display.
    • If "Small leak is detected in Canister" is indicated, go to step 7.
    • If "Small leak is detected in Tank" is indicated, go to step  28.
    • If another result is indicated, go to step  37.
  7. Turn the ignition switch OFF.
  8. Disconnect the two vapor hoses (A) from the EVAP two way valve (B).
    Fig 2: Disconnecting Two Vapor Hoses From EVAP Two Way Valve
    G03640064Courtesy of AMERICAN HONDA MOTOR CO., INC.
  9. Plug the tank side port (C) of the EVAP two way valve.
  10. Connect a T-fitting (D) from the vacuum gauge and the vacuum pump to the EVAP two way valve.
  11. Turn the ignition switch ON (II).
  12. Do the EVAP BPS ON in the INSPECTION MENU with the HDS.
  13. Slowly apply 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.

    Does it hold vacuum for about 20 seconds? 

    1. YES  - Go to step 14.
    2. NO  - Replace the EVAP two way valve or O-ring, then go to step  61.
  14. Reconnect the fuel tank side vapor hose (A) to the EVAP two way valve (B) and plug the canister side vacuum hose (C).
    Fig 3: Reconnecting Fuel Tank Side Vapor Hose To EVAP Two Way Valve And Plug Canister Side Vacuum Hose
    G03640065Courtesy of AMERICAN HONDA MOTOR CO., INC.
  15. Check the connection of the fuel tank vapor control valve vent hose and quick-connect fitting.

    Is the hose connected properly? 

    1. YES  - Go to step 16.
    2. NO  - Repair the fuel tank vapor control valve vent hose or the quick-connect fitting, then go to step  61.
  16. Disconnect the fuel tank vapor control valve vent hose (A) from the EVAP canister (B) and plug the canister port (C).
    Fig 4: Disconnecting Fuel Tank Vapor Control Valve Vent Hose From EVAP Canister And Plug Canister Port
    G03640066Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Disconnect the vacuum hose (A) between the EVAP canister and the EVAP canister purge valve (B) from the EVAP canister purge valve side.
    Fig 5: Disconnecting Vacuum Hose Between EVAP Canister And EVAP Canister Purge Valve From EVAP Canister Purge Valve Side
    G03640067Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Connect a T-fitting (C) from the vacuum gauge and the vacuum pump to the vacuum hose.
  19. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Inspect the fuel tank vapor control valve vent hose. If OK, replace the fuel tank, then go to step  61.
    2. NO  - Go to step 20.
  20. Disconnect all drain hoses from the EVAP canister vent shut valve, and plug their ports.
  21. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Replace the EVAP canister vent shut valve, then go to step  61.
    2. NO  - Go to step 22.
  22. Disconnect the vacuum hose (VSV line) (A) between the EVAP canister (B) and EVAP canister vent shut valve from the EVAP canister side, and plug the EVAP canister port (C).
    Fig 6: Disconnecting Vacuum Hose (VSV Line)
    G03640068Courtesy of AMERICAN HONDA MOTOR CO., INC.
  23. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Check the hose between the EVAP canister vent shut valve and the EVAP canister. If the hose is OK, replace the EVAP canister vent shut valve, then go to step  61.
    2. NO  - Go to step 24.
  24. Reconnect the vacuum hose to the EVAP canister purge valve.
  25. Disconnect the vacuum hose (A) between the EVAP canister (B) and the EVAP canister purge valve from the EVAP canister side.
    Fig 7: Disconnecting Vacuum Hose Between EVAP Canister And EVAP Canister Purge Valve From EVAP Canister Side
    G03640069Courtesy of AMERICAN HONDA MOTOR CO., INC.
  26. Connect a T-fitting (C) from the vacuum gauge and the vacuum pump to the vacuum hose.
  27. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum? 

    1. YES  - Check for a cracked or damaged of the EVAP canister. If the EVAP canister is OK, go to step  61.
    2. NO  - Check the hose between the EVAP canister purge valve and EVAP canister. If the hose is OK, replace the EVAP canister purge cut valve, then go to step  61.
  28. Turn the ignition switch OFF.
  29. Disconnect the two vapor hoses (A) from the EVAP two way valve (B).
    Fig 8: Disconnecting Two Vapor Hoses From EVAP Two Way Valve
    G03640070Courtesy of AMERICAN HONDA MOTOR CO., INC.
  30. Plug the tank side port (C) of the EVAP two way valve.
  31. Connect a T-fitting (D) from the vacuum gauge and the vacuum pump to the EVAP two way valve.
  32. Turn the ignition switch ON (II).
  33. Do the EVAP BPS ON in the INSPECTION MENU with the HDS.
  34. Slowly apply 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.

    Does it hold vacuum for about 20 seconds? 

    1. YES  - Go to step 35.
    2. NO  - Replace the EVAP two way valve or O-ring, then go to step  61.
  35. Test the fuel tank vapor control valve (see FUEL TANK VAPOR CONTROL VALVE TEST  ).

    Is the fuel tank vapor control valve OK? 

    1. YES  - Go to step 36.
    2. NO  - Replace the fuel tank vapor control valve, then go to step  61.
  36. Check for poor connections at the fuel tank vapor tube, fuel tank vapor recirculation tube, fuel tank vapor signal tube, FTP sensor hoses, and the vapor line between the EVAP two way valve and the fuel tank.

    Are the all connections OK? 

    1. YES  - Remove the fuel tank unit (see FUEL TANK UNIT REMOVAL/INSTALLATION ), and check its seal and mating surface, then go to step  61.
    2. NO  - Reconnect or replace the loose hose, then go to step  61.
  37. Turn the ignition switch OFF.
  38. Reconnect the fuel tank side vapor hose (A) to the EVAP two way valve (B), and plug the canister side vacuum hose (C).
    Fig 9: Reconnecting Fuel Tank Side Vapor Hose To EVAP Two Way Valve, And Plug Canister Side Vacuum Hose
    G03640071Courtesy of AMERICAN HONDA MOTOR CO., INC.
  39. Check the connection of the fuel tank vapor control valve vent hose and quick-connect fitting.

    Is the hose connected properly? 

    1. YES  - Go to step 40.
    2. NO  - Replace the fuel tank vapor control valve vent hose or the quick-connect fitting, then go to step  61.
  40. Disconnect the fuel tank vapor control valve vent hose (A) from the EVAP canister (B) and plug the canister port (C).
    Fig 10: Disconnecting Fuel Tank Vapor Control Valve Vent Hose From EVAP Canister And Plug Canister Port
    G03640072Courtesy of AMERICAN HONDA MOTOR CO., INC.
  41. Disconnect the vacuum hose (A) between the EVAP canister and the EVAP canister purge valve (B) from the EVAP canister purge valve side.
    Fig 11: Disconnecting Vacuum Hose Between EVAP Canister And EVAP Canister Purge Valve From EVAP Canister Purge Valve Side
    G03640073Courtesy of AMERICAN HONDA MOTOR CO., INC.
  42. Connect a T-fitting (C) from the vacuum gauge and the vacuum pump to the vacuum hose.
  43. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Inspect the fuel tank vapor control valve vent hose. If OK, replace the fuel tank vapor control valve, then go to step  61.
    2. NO  - Go to step 44.
  44. Disconnect all drain hoses from the EVAP canister vent shut valve, and plug their ports.
  45. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Replace the EVAP canister vent shut valve, then go to step  61.
    2. NO  - Go to step 46.
  46. Disconnect the vacuum hose (VSV line) (A) between the EVAP canister (B) and EVAP canister vent shut valve from the EVAP canister side, and plug the EVAP canister port (C).
    Fig 12: Disconnecting Vacuum Hose (VSV Line) Between EVAP Canister And EVAP Canister Vent Shut Valve From EVAP Canister Side, And Plug EVAP Canister Port
    G03640074Courtesy of AMERICAN HONDA MOTOR CO., INC.
  47. Slowly apply vacuum to hose (A) with 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum for 1 minute? 

    1. YES  - Check the hose between the EVAP canister vent shut valve and EVAP canister. If the hose is OK, replace the EVAP canister vent shut valve, then go to step  61.
    2. NO  - Go to step 48.
  48. Reconnect the vacuum hose to the EVAP canister purge valve.
  49. Disconnect the vacuum hose (A) between the EVAP canister (B) and the EVAP canister purge valve from the EVAP canister side.
    Fig 13: Disconnecting Vacuum Hose Between EVAP Canister And EVAP Canister Purge Valve From EVAP Canister Side
    G03640075Courtesy of AMERICAN HONDA MOTOR CO., INC.
  50. Connect a T-fitting (C) from the vacuum gauge and the vacuum pump to the vacuum hose.
  51. Slowly apply 2.0 kPa (0.6 in.Hg, 15 mmHg) of vacuum to the hose.

    Does it hold vacuum? 

    1. YES  - Check for a cracked or damaged of the EVAP canister. If the EVAP canister is OK, go to step 52.
    2. NO  - Check the hose between the EVAP canister purge valve and EVAP canister. If the hose is OK, replace the EVAP canister purge valve, then go to step  61.
  52. Turn the ignition switch OFF.
  53. Disconnect the two vapor hoses (A) from the EVAP two way valve (B).
    Fig 14: Disconnecting Two Vapor Hoses From EVAP Two Way Valve
    G03640076Courtesy of AMERICAN HONDA MOTOR CO., INC.
  54. Plug the tank side port (C) of the EVAP two way valve.
  55. Connect a T-fitting (D) from the vacuum gauge and the vacuum pump to the EVAP two way valve.
  56. Turn the ignition switch ON (II).
  57. Do the EVAP BPS ON in the INSPECTION MENU with the HDS.
  58. Slowly apply 1.3 kPa (0.4 in.Hg, 10 mmHg) of vacuum to the hose.

    Does it hold vacuum for about 20 seconds? 

    1. YES  - Go to step 59.
    2. NO  - Replace the EVAP two way valve or O-ring, then go to step  61.
  59. Test the fuel tank vapor control valve (see FUEL TANK VAPOR CONTROL VALVE TEST  ).

    Is the fuel tank vapor control valve OK? 

    1. YES  - Go to step 60.
    2. NO  - Replace the fuel tank vapor control valve, then go to step  61.
  60. Check for poor connections at the fuel tank vapor tube, fuel tank vapor recirculation tube, fuel tank vapor signal tube, FTP sensor hoses, and the vapor line between the EVAP two way valve and the fuel tank.

    Are the all connections OK? 

    1. YES  - Remove the fuel tank unit (see FUEL TANK UNIT REMOVAL/INSTALLATION ), and check its seal and mating surface, then go to step 61.
    2. NO  - Reconnect or replace the loose hose, then go to step 61.
  61. Reconnect all hoses and connectors.
  62. Turn the ignition switch ON (II).
  63. Reset the PCM with the HDS.
  64. Do the PCM idle learn procedure (see PCM IDLE LEARN PROCEDURE ).
  65. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS.

    Is the EVAP SYSTEM normal? 

    1. YES  - Troubleshooting is complete.
    2. NO  - Check for poor connections or loose terminals at the FTP sensor, the EVAP bypass solenoid valve, the EVAP canister vent shut valve, or the EVAP canister purge valve and the PCM, then go to step  1.
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