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I should have thought you "backprobed" the connector, which is the recommended way to avoid harming the business ends of the pins. Don't know why I didn't think of it for your grounding test.
That leaves only one speculation I can make; that there might remain some invisible corrosion or tension defects in the 35-pin ECU connector which will not always be revealed by measurements taken from the harness side.
It sure does seem like you are close to the fault, given its response to everything you try at the ECU.
I'm reminded of a recurring fault with my grandson's '90 244 which seemed to be cured for a while by swapping ECUs, but eventually was solved only by flushing the female connector with contact cleaner while exercising its attachment to the computer. It is easy to get a 30-year-old car with wet carpets, windshield leak, clogged rocker panels, or even a window left open in its history.
Maybe if you run out of the means to pin down the circuit affected, you can try hosing it down with some contact cleaner or DeoxIT product and get as lucky as I got.
--
Art Benstein near Baltimore
Impedance is complex. Resistance is real. - AB
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