Today I was again pulling codes and went through several voltage tests. I tried to clear the codes on pin 8 and held my tester button down for ten seconds. The high pitched whine near the MAF stopped again. Now, again, the car won't start.

The interesting find here is pin 8 is only showing 11 volts. I'm studying wiring diagrams trying to figure out where the base module gets its voltage from.

Any suggestions are welcome!