Diagnostic Aids
- To help locate intermittent leaks, use the J 41413-200 evaporative emissions system tester (EEST) to introduce smoke into the EVAP system. See Special Tools . Move all EVAP components while observing smoke with theJ 41413-SPT High Intensity White Light. See Special Tools .
- 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 fuel tank pressure (FTP) parameter for vacuum decay, this type of leak may be detected.
- To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT . See Special Tools .
- For intermittent conditions, refer to Testing for Intermittent Conditions and Poor Connections .