'12 Impala 5 V Ref 3 Issue

I Have a 2012 Chevy Impala Police with the Customer concern of no power, CEL, Traction and reduced engine power light. Codes scanned are P0697 (5V Ref Circuit 3) and P2138 (APP correlation 1/2). Was told accelerator pedal was replaced with a Dorman part. I can see why, because what I found is that they are discontinued.

I am back probed into x111 pin N for 5v ref 3 to APP (according to OE reference diagram and powertrain management) and 5v ref 3 right into MAP sensor. From X1 of ECM, pin 33 is a tan wire, remains tan through x111 then into APP. Connector view shows Pin N on X111 to be a 5v ref 1?
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Before looking more into the diagrams, I found a few frayed wires at a contact point where they have been rubbing on the airbox for quite some time. A tan wire, and a white w/ black. I figured Perfect! Only 20 mins in thinking I hit a home run. Then as I usually do, I want to confirm by quickly shorting the wire to ground with a test light, No drop on my waveforms in both 5V refs. 

Look through diagrams again, make sure I'm in the right wires, and continuing to short the wire, My cluster chime starts, traction lights and reduced power lights come on (Customers Main Concern) but no loss in 5v on scope.

So I disconnect X1 at ECM, pull the tape back, and confirm that the tan wire that is frayed goes to pin 33.

At this point I called it a night and went inside to do some more research and here I am.

Next steps; Do I load test powers and grounds at this ECM and condemn it if their good? Or has someone tackled this same problem before and can provide some insight to what I may be missing. Thanks in advance. 

I think you found it. Even though you don't notice loss of 5v ref, does the 5v ref3 trouble code return when you short that wire?

I have seen quite a few issues on this body style causing APP/TPP codes and reduced power.
The connector at the left strut tower, harness rub through, bad app, bad new app...
I had 2 bad Dorman pedals on the same car once. On that one I learned that if I lift the pedal upward with my toe and let it snap back down that it would set the APP/TPP codes. I had to get a good used one to fix that car.

Right? lol I’m certain this is it. However no, the code doesn’t set after cleared then manually shorted. After multiple attempts. I don’t like keeping a 5v driver shorted long but I did it as many times as my heart contented. Also probed intro many of the other wires on x111 and the adjacent connector, checking the other low ref wires.

Also, something mentioned worth noting; After doing some more research, my scan data shows description in mode 10 to be an “open” in the ref circuit.

I don’t really agree with anything Dorman sending an input to a module. However, I found this vehicle to be infested with German roaches so I was not getting in it. Let alone road testing it.

I think the next call would be repair the wires, tape up the harness, clear the codes and have the customer drive it.