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EGR codes and testing with AutoEnginuity
I've got P0401, P0404, P0405 on my Excursion in the signature with an intact EGR system and 193k miles. I've been getting P0401 once or twice per year on long highway runs for a while but I would clear it and it would go away. This weekend it began coming back as soon as the relearn cycle was complete. I pulled the EGR valve, which was still pretty clean from previous maintenance, and cleaned it with a brush and a little spray anyway.
There was a large mound of soot buildup in the intake right under the valve, so I carefully broke that up with a pick and shop vacuumed it out. After this I started to get P0404/05. I checked the resistance per this thread
and everything is within range. The connector and wiring harness look fine.
AutoEnginuity passes the KOER tests but shows all 0 on the live data feeds for EGR position desired and actual. It also shows no for EGR circuit fault. Is this the best/only way to test the EGR using AE? Should I try actuating it and see if the values change?
2005 Excursion Limited 6.0L 2wd
Atlas 40, Bulletproof EGR cooler and VK688, IPR coolant filter, KC compressor wheel, Cat coolant, 7.3 fan clutch. Otherwise, all stock.