Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. 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, P0335, P0336, P0641, or P0651 is not set.
The engine is cranking or running.
DTC P0340 runs continuously when the above conditions are met.