Conditions For Running DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running.
The Ignition 1 Signal voltage parameter is between 11-18 volts.
The EGR valve is commanded to 0 percent for 20 seconds after the EGR valve has been commanded to open more than 40 percent for 0.5 seconds.