Conditions for Running the DTC

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0641 or P0651 is not set.
The engine is cranking or running.
MAF is greater than 3 grams per second
The DTC runs continuously when the above conditions are met.