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update. dpfe voltage is within spec. although the signal is there from the dpfe, the pcm is not grounding the EGR regulator to send vacuum to the valve. I can see the egr curve(on the Matco Mentor) rise under partial pedal just as anticipated as well as the dpfe voltage fluctuate within spec. I'm leaning towards wiring, or maybe the pcm. The original dpfe which I had first removed had already been replaced with the updated unit (going by the part #). So this vehicle could possibly have a bad pcm that the previous owner would not have wanted to spend the $ to replace. I'm not going to jump the gun, but I have someone at Bluebonnet doing some research for me. We'll see.
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