Tank integrity diagnosis
WARNING: This page is about a different car, the 2003 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
It is possible to check the evaporative emission system for leaks with the tank integrity diagnosis. If there is a leak, it will not be possible to create or retain a vacuum in the system during the diagnosis.
The diagnosis is performed once per trip and its objective is to determine whether a leak corresponding to a hole larger than 0.5 mm (0.020") in diameter is present in the evaporative emission system.