Conditions For Running DTC

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Engine is running.
Ignition 1 signal voltage parameter is 11-18 volts.
EGR valve is commanded to zero percent for 20 seconds after EGR valve has been commanded to open more than 40 percent for 0.5 second.