Diagnostic Aids

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The evaporative emission system can be filled with smoke more quickly and completely by opening the system opposite the end where the smoke is injected. When injecting smoke at the service port remove the fuel fill cap, or temporarily leave the vent open, until smoke is observed then close the system and continue testing.
To help locate intermittent leaks using the J 41413-200: EEST, move all evaporative emission components while observing smoke with the J 41413-SPT: White Light.
Individual components can be isolated and tested using adapters in the J 41413-300: Kit.
A condition may exist where a leak in the evaporative emission system only exists under a vacuum condition. This type of leak may be detected by using the scan tool Purge/Seal function to create a vacuum in the evaporative emission system and then observe the fuel tank pressure parameter for vacuum decay.