Diagnostic Aids

To help locate intermittent leaks, use the J 41413-200 Evaporative Emission System Tester (EEST) to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT 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 a scan tool PURGE/SEAL function to create a vacuum, then observe the FTP parameter for a vacuum decay.
To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .
For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .