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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Control System & Fuel System - 1.8L (Lay) - DTC P0441 To DTC P2A00) >> DTC P0455 or P0456 >> Circuit/System Testing >> Leak Testing P0455 and P0456

Leak Testing P0455 and P0456

WARNING: This page is about a different variant/trim than selected.
  1. Verify the following conditions do not exist in the EVAP system:
    • Loose, incorrect, missing, or damaged fuel fill cap
    • A damaged EVAP purge solenoid
    • Disconnected, incorrectly routed, kinked, or damaged EVAP pipes and hoses
    • A damaged EVAP canister, lines, or fittings
    • If you find any of the above conditions, repair as necessary.
    2. IMPORTANT:
    • The EVAP vent solenoid DOES NOT have to be activated in order to test for leaks.
    • Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilize before starting the diagnostic procedure. The system flow will be less with higher temperatures.
  2. Connect the J 41415-30  to the fuel tank filler neck. See Special Tools . Connect the J 41413-200  to the J 41415-30  . See Special Tools .
    3. IMPORTANT: Leaving the EVAP filter hose disconnected speeds up the filling of the canister and fuel tank with smoke. Waiting until smoke is seen exiting the open EVAP filter hose before plugging the hose shortens leak testing diagnostic time.
  3. Disconnect the EVAP filter hose, inlet side, at the 13 mm (0.5 in) diameter steel vent pipe. The EVAP filter hose has a quick connect fitting. Refer to EVAP Canister Filter Replacement for the quick connect fitting servicing procedure.
  4. Turn the nitrogen/smoke valve on the control panel to SMOKE. Use the remote switch to introduce smoke into the EVAP system.
  5. Continue to introduce smoke for approximately 1 minute.
  6. Turn the nitrogen/smoke valve on the control panel to NITROGEN. Use the remote switch to introduce Nitrogen gas into the EVAP system for 60 seconds.
    7. IMPORTANT: Introducing smoke in between 60 second intervals of Nitrogen also increases the speed of the filling of smoke in the fuel tank, the filler pipe vapor space, and the EVAP canister. This occurs because the pressure at which Nitrogen gas is applied is more than the pressure at which smoke is introduced. The Nitrogen gas pushes the smoke that was just introduced through the canister and into the fuel tank.
  7. Continue to introduce smoke, then Nitrogen, at 60 second intervals, until smoke is seen exiting the open EVAP filter hose.
    8. IMPORTANT: The installation of the adapter J 41413-323 or J 41413-324 seals the tank side of the EVAP system.
  8. Plug the open end of the EVAP filter hose with the J 41413-323 or J 41413-324 adapter from the J 41413-300  . See Special Tools .
  9. With the system now sealed, again introduce smoke, then Nitrogen, at 60 second intervals.
    10. IMPORTANT: The fuel tank may need to be lowered to improve visibility of some of the EVAP system components.
  10. Verify that smoke is not exiting the entire EVAP system with the J 41413-SPT  . See Special Tools .
    • If smoke is observed, repair the condition as necessary.
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