I think you are right Paul. I checked the service manual and the terminator (part #39) is located above the thermister (part #35)
near the top of the evap. Should I reposition the terminator and see if it fixes the problem before disconnecting the sensor?
It's very hard to unplug the evap thermister without removing the back panel and it's much easier to open the overhead
control board instead. So I opened the control board and removed pin #1 of plug P1. I believe this should disconnect the
thermister from the system. We'll see how it goes in a day or two.
Pin 1&2 are spare-7&8(blacks) go to evap thermistor. Indeed the terminator is at that location, I have an evap from a TFI and it's there also but not as close as your pic. If you can look up a 4201910 and see where they show the terminator, that's not where the one on mine is?
Here is a better close-up of the diagram. Evap sensor (therminster) is the only component that uses light blue with black strand wire and
it's connected to the side of the board with only one connector. I'll check the evap bay shortly to see if there is any ice buildup. If there
still is I plan to short the terminator and watch it closely for a day. Now I'm looking at this picture closely I think we were both right.
My pin 1-2 is your pin 7-8, I simply counted the pin #'s in the wrong direction.
Yes usually all their thermistors have a blue tracer, you'll see the others are blue/white & blue yellow. There should be a box to the right of that wiring diagram with all pins and color codes. Why short the terminator?