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 ECM detects a pressure change that is less than a calibrated amount.
- The ECM must complete several engine OFF natural vacuum (EONV) tests before the diagnostic can turn the malfunction indicator lamp (MIL) ON or OFF.