Hi,
As far as the wires you mentioned, I'm not sure exactly what you want to be checked. The concern is the smell you described. I would be looking for burnt or melted wiring in the harness.
I am attaching the entire schematic for the engine controls/powertrain management. I had to cut the pics in half to make them readable, but I did overlap them so you can follow. Take a look through them and see if they help. They include the entire pin-out of the PCM.
Let me know if this helps or if you have other questions. Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Take care and let me know what is found.
Joe
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Tuesday, February 23rd, 2021 AT 5:06 PM