Conditions for Setting the DTC
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 FTP sensor is more than 8 inches H2O vacuum for 2 seconds during the 13 minute test.
OR
The FTP is less than -2.5 inches H2O or more than +5 inches H2O for 3 seconds after a cold start ignition ON.