Conditions for Setting the DTC

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The ECM detects that the measured MAF is not within range of the calculated airflow based on throttle angle and engine speed.
AND
The ECM detects a significant error in the long term fuel trim at cruising speed.
OR
The ECM detects that the measured MAF is not within range of the calculated model that is derived from MAP.