I am working on a 95 Forumla. The a/c will work if I reset the PCM, I dont have a cable to hook it out to my laptop, working on making one, but no luck. The fans do not turn on when the a/c on. I was wondering what the Ohm readings on the 3 wire pressure switch, I think that it is not working and would like to test it with my meter before replacing.

Thanks

Taylor

 

Lets see... the gray wire is the PCM 5 volt reference and the black is sensor ground. The red/black wire should be the sensor signal to the PCM and I would imagine it would be from ~1-5v depending on pressure.