Conditions for Running the DTC

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The mass air flow (MAF) is greater than 3 grams per second.
DTC P0101, P0102, P0103, P0641, or P0651 is not set.
The engine is cranking or running.
DTC P0340 runs continuously when the above conditions are met.