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Old 10-06-2021, 11:54 AM
oldskewel oldskewel is offline
Join Date: Nov 2014
Location: SF Bay Area
Posts: 1,318
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Originally Posted by andrewwynn View Post
Pressure sensor 0.9v. It's pretty low on the scale, what does that read when temp is hot and AC runs?

I don't know what the normal voltage off the press sensor is. It's not a simple on/off switch it sends a voltage to the brain that figure out the actual pressure. If it reads low incorrectly, it may allow operation as ambient temperature raises the pressure inside so see what is the voltage on the pressure sensor when it works and maybe watch real-time the ECT as well to see the exact temp where it magically starts working.
Checked my notes from when I was debugging my aux fan (turned out that was the one and only problem, so my AC, pressure sensor, ECU, etc. were all good for this data):

2001 3.0i

"AC Pressure sensor - in AC line very close to the lower radiator hose. Measured in Foxwell:
Ignition ON, engine stopped, AC off, cold: 1.25V
... connector removed: 5.00V
Engine running: 1.24V
Engine running, AC on: 1.76V, rising
... connector removed: 5.00V"
2001 X5 3.0i, 190k miles, AT, owned since 2014
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