From the Electrical Troubleshooting Manual:
https://previews.dropbox.com/p/thumb...ue&size_mode=5
From the Service Manual:
https://previews.dropbox.com/p/thumb...ue&size_mode=5
TW sensor is closest to the head. The other is Coolant Temp Switch B. It's one of 2 switches that operate the cooling fans, at least on my '89 EFI AC equipped car.
Wiring diagrams and explanations for the cooling fan circuit are on p. 202 of the '89 Electrical Troubleshooting Manual. Diagrams and explanation for the EFI system and TW sensor are on p. 248 of the same. I can't speak to individual cars, or model years other than 88-89, but this is what Honda intended to come out of their factories, and barring industrial sabotage or corrupt union intrigue, that's probably how they came. I'm not trying to be combative; I just don't want people chasing their tails needlessly. Electrical troubleshooting is hard enough without going down blind alleys.
In looking at this more closely, I found that the wires going to my TW sensor (closest to the head) are completely severed in
2 places! I don't know how that didn't trip the CEL, but even if there were enough stray strands connecting together to prevent a CEL, there weren't enough to give a clean signal. That's probably why the car has more power some days than other days, why the idle occasionally becomes rough and my warm restarts are iffy. Now that I've found the opens, the CEL is lit. Thanks for being a day late and a dollar short! I'll replace that connector and see what happens. I do still have some roughness occasionally on warm restarts which I don't like.
Does anyone know if
this connector would work for that application?
Thanks for your help guys!