Conditions for Running the DTC

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0335, P0336, P0641, or P0651 is not set.
The engine is cranking or running.
The mass air flow (MAF) is greater than 3 grams per second.
The DTC runs continuously when the above conditions are met.