The covering looked clean from the outside, once I cut it open it was nasty.

 

I would test for continuity. That will tell you if the port is getting a signal.

 

First of all thanks for all you help. Its frustrating when you have to fix something, so you can then determine what you need to fix.
If I determine all ports are getting signal, then what would I check after that. A ground?
I noticed that in the wiring diagram 2 grounds exists, pins 4,5 from DLC connector. They connect to C0551-1 and C0017-5.
C0551-1 per rave looks like it is located under the RH fascia carpet I assume, as it only shows arrow pointing to carpet. Could it possibly be a bad ground there?

 

Tested for continuity on header and at connectins. All checked out OK. I assume since I get no volts on Pin 7 that it is shorted to ground somewhere, but upon inspection of K wires do not see anything that seems like they are touching a ground area, so I am at a loss. Very frustrating.

 

Did you ever figure it out? I’m at a loss seeing as I have good continuity and different voltage readings from the ecu k lines with the header disconnected. I get Battery voltage from ecm and when that is disconnected from header my scanner will read. But the ecm is really the only one I need to read haha. This is ECM #2 for me and have a 3rd to test but thinking it’s a separate issue and may be related to a ground wire in the header but can’t find any info.