Diagnostic Aids

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for a loose, missing, incorrect, or damaged fuel fill cap.
Verify that the fuel filler neck sealing surface is not distorted or damaged.
To help locate intermittent leaks, use the J 41413-200 (J 41413-100): EEST to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with a high intensity white light.
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. By using the scan tool Purge/Seal function to create a vacuum, seal the system and observe the FTP parameter for the vacuum decay, this type of leak may be detected.
If a small leak is difficult to find, it may be necessary to remove the EVAP components and leak test them one at a time using the adapters in the J 41413-300: Kit.