Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0601, P0602, P0604, P0606, P1515, P1516, P1517, or P1518 are not set.
DTCs P1120, P1220 and P1221 are not set at the same time or P1120 and P1220 are not set at the same time.
The engine operates longer than 1 second.
The engine speed is greater than 500 RPM.