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Originally Posted by dantatara
Thanks for the sensor, manual, and PCM info.
Greg, thanks for the system cooling fan info and schematic. I read through it and one item stands out and that is this; a Fans off item, "The A/C refrigerant pressure is less than 190 psi (A/C off)."
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While it is listed as an OR, I beleive that should be an AND. If the temp is < 220 AND the pressure is less then 190. IOW, when there isn't a need for it to be on, it's off. Otherwise if the car's AC ever went south, the fans would never turn on. Not exactly the best failure mode.
I would look at shorting out F3 and/or C10 to ground. This should energize the relay(s) and turn on the fan. You should be able to hear a click using a mechanic's stethascope. If the fans don't run or you don't hear a click, I'd look at a power issue. If you do hear a click, it's either wiring between the relay and the PCM, or the PCM itself not triggering it.