Quite welcome, and, no offense taken. I thoroughly understand the frustrations of trying to understand/maintain/fix and have a multiply-dependent-sensored system of control (that I deem entirely unnecessary for correct or near perfectly efficient internal combustion, hence me tearing electronic fuel injection out of my car nearly 2 years ago, that has eliminated me tearing my hair out continually chasing one problem issue after another) that just frickin' works right, or at least function somewhere near right.
I'm not surprised at all to read that a do-it-yourselfer has given a mechanic a run for his money, or outrun 'em by a mile. What sucessfully dealing with things like this, and many other things takes, I have always believed is simply a healthy attitude most especially toward learning, and to DIY and kick royal a$$, realizing that nobody else is going to value and take care of your things better than you. Rules I live by, that work damn good.
In addition to the TFI-IV (PIP, SPOUT) page image above, some service check page images:
Yes, the physical sensors and their function is important, but IMHO troubleshooting should always, ALWAYS begin with or include making certain that the simple basics like wire connections and continuity (opens/breaks, short circuits) are sound, because the basics are just as (or more) important so signals getting sent to and from sensors and back and forth between them and the computer are happening without fault of any kind and in every/any situation, if the control system is going to have a chance of working to it's fullest function for a good long time.
Another thought... there isn't a layer of paint underneath that remote-mounted TFI module, is there?...
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