Conditions for Running DTC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The PCM performs this DTC diagnostic test continuously.
DTCs P0251, P0335, or P0370 are not set.
The engine speed has not changed more than 56 RPM for 5 seconds.