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.

The EVAP system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. For example, when injecting smoke at the service port, remove the filler cap or temporarily leave the vent open until smoke is observed. Close the system and continue testing. If using a fuel cap adapter at the filler neck, use the J 41413-VLV: Fitting Tool at the service port to allow the system to fill faster.
To help locate intermittent leaks, use the J 41413-200: EEST to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with a high intensity white light.
A condition may exist where a leak in the EVAP system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to seal the system and create a vacuum. Then observe the FTP parameter for vacuum decay.
If a small leak is difficult to find, it may be necessary to remove the EVAP components and test them one at a time using the adapters in the J 41413-300: Kit.