Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 Chevrolet TrailBlazer, and 2004 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.

The PCM detects that the difference between the actual airflow (MAF) and the Speed Density calculated air flow is more than expected.
The above condition is met for less than 1 second.