Circuit/System Verification: Notes

With Service Bay Test

IMPORTANT: Verify the EVAP vent valve functions before proceeding with this diagnostic. You should hear or feel a click when commanded ON with a scan tool. A circuit condition can cause the solenoid to be inoperative without setting a DTC P0448, or a DTC P0449. Refer to DTC P0498 or P0499 .
1. Verify the EVAP system using the EVAP Service Bay Test. DTC P0455 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Without Service Bay Test

1. Verify the following conditions do not exist in the EVAP system:
   • Loose, incorrect, missing, or damaged fuel fill cap
   • Loose, missing, or damaged service port schrader valve
   • A damaged EVAP purge solenoid
   • Disconnected, incorrectly routed, kinked, or damaged EVAP pipes and hoses
   • A damaged EVAP vent valve or EVAP canister
   • If you find any of the above conditions, repair as necessary.
IMPORTANT:
• Make sure the EVAP vent valve functions before proceeding with this diagnostic. You should hear or feel a click when commanded ON with a scan tool. A circuit condition can cause the solenoid to be inoperative without setting a DTC P0448, or a DTC P0449. Refer to DTC P0498 or P0499 .
• Refer to the J 41413-200  operation manual for detailed instructions.
2. Remove the fuel fill cap. Connect the GE-41415-50  to the fuel tank filler neck. Connect the J 41413-200  to the GE-41415-50  .
3. Calibrate the J 41413-200  Flow Meter to the correct leak orifice for the vehicle.
IMPORTANT: The EVAP vent solenoid valve will not remain closed when commanded ON with positive pressure applied to the EVAP system.
4. Disconnect the EVAP vent line from the vent solenoid. Seal the EVAP vent line using the correct plug from the J 41413-300  .
IMPORTANT: Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
5. Activate the J 41413-200  and compare the flow meter's stable floating indicator position to the red flag. The floating indicator should be below the red flag.
   • If the floating indicator is above the red flag, test for a leak in the EVAP system.
6. Increase the EVAP purge solenoid to 100 percent. The FTP sensor pressure should drop to less than 1 inch H2O. If the floating indicator is below the red flag, test for a blockage or restriction in the EVAP system.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.