That ‘high end scanner’ costs $30 or less these days and what you see when you take the acoustic and styling covers off the engine usually looks a lot like the last 25 years of multi port fuel injected motors. Only if you’re used to carbs or GM TBI should it look completely alien to you.
Problem it was an electronics issue with the fuel system. Rather than a linkage on the gas pedal they used a, my guess, is an encoder. Fuel pump worked, spark worked, compression worked. BUT there was no feedback to the encoder on the gas pedal. So no manner of spanner would have helped with that issue. Then again. I use to have a scanner but someone borrowed it and never brought it back.
That reminds me... I remember my POS Ford when I had to use an analogue OHM meter to sweep the codes. God I hated that car. Worst POS ever created.