A/C issue, PCM not providing a ground to pink/yellow wire?

2005 Ford E-350

With Multi-Function Selector Switch on Max A/C a purple wire becomes energized with 12-volts.
wire goes through low- and high-pressure switches which are both currently jumped with a piece of wire for troubleshooting purposes.
wire with 12-volts completes its journey and then goes to PCM.

PCM is not providing a ground to pink/yellow wire which goes to pin 2 of the A/C control relay, which should cause relay to click and join a fused 12-volt wire with a wire that goes down to the ac compressor clutch.

Is there perhaps some other data that is making the ECM unhappy? Some folks have suggested a power steering pressure sensor which will cause the PCM to cut off the A/C compressor if making a harsh turn at low speed, but my vehicle doesn't have one.

do I need a high end OBD scan tool?
mine is a basic Actron, it does show live data but probably nothing for A/C demand info.

if I bypass this, but still make sure to keep the low- and high-pressure switches involved for safety reasons and not be a barbarian hacker, then does cutting the PCM out of the equation cause any drawbacks? For instance, does the PCM automatically raise the idle to compensate for the A/C compressor being on? (I'd like to fix it the right way though).