Conditions For Running DTC

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

The engine is operating on alternative fuel for an initial failure. The AF ECM will run this DTC in gasoline mode after an initial alternative fuel mode failure.
No AF ECM MAF sensor DTCs are set this ignition cycle.
The MAP sensor signal indicates 31.17 in. Hg (105.23 kPa) or less.
The mass air flow is more than 3 grams per second for 1 second continuously.