GA Fitz,

Dan's suggestion is great. Contact cleaner.

Best of all he knows a problem getting that AMM signal to the ECU is never anywhere else. It is right there, in the plug on the AMM.

What I've seen is the boot wears a hole in it. Hole in the boot. Well, it is 20 years old. Moisture gets in through the hole. Look for green where it should be silver and gold. Use a large paper clip as a pin release tool.

But don't overlook the possibility one of the tangs is not out far enough allowing the pin to back out of the housing when you plug it together. This has caught me before. I know fiddling with tiny things like that is a frightening proposition in 20 degree weather, so if you can just check to see the wires don't pull back in the connector, and then maybe just hit the thing with spray cleaner before you re-seat it, you'll clear that 121. If not, you really need to sub in another AMM.

Just wanted to catch you before you went down the wrong path with continuity checks for a very unlikely problem with that wire anywhere between the AMM and the ECU.


--
Art Benstein near Baltimore


Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.