Update on this:
I have replaced the alternator (that was NOT a fun job) and to my surprise that has resolved the electrical system problem and the fault code has now cleared. I was fairly convinced that I was going to have to repair the ECM.
However, the AC is still not working. I have no idea why. I unplugged the air quality sensor - no change.
Vida now shows
Vida shows the compressor status going from ~25% to ~78% (presumably duty cycle) when the AC button is off or on respectively. I can't detect any difference in engine load.
Now that the AQS is unplugged I get 2 faults codes:
CCM-0040 Air quality Sensor Internal fault
and also one that implies it's disconnected. I didn't note the fault code.
Odd that the internal fault is still showing even though I've disconnected it.
Pressure reading is ~750 kPa regardless of whether the compressor is on or off which I find odd. It does change very slightly. Since that's about 100 psi, then I assume it's the high-pressure side. I don't have my AC gauges with me so I can't check for gas, but 100 psi seems like a lot if there was a leak.
I'm at a loss now as to what to do to diagnose further.
Any ideas? Thanks.
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XC90 V8 Executive
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