Finally.
I bought a salvage yard E67 off a V6 Malibu, sent it to a fellow in Austin TX who flashed a 2013 ZR1 OS on it, picked up a special copy of HP Tuners (2.25.xxx, still in beta), and copied my tune from the crate motor tune, and wrote the calibration out.
Voila, PWM fans.
Finally.
Geez, what a bunch of walls to knock down!
Net: The GMPP crate motor E67 OS does not and can not support PWM fans or AC pressure sensors. You have to use a late model passenger car E67 or E38 and OS, and deal with all the extra equipment implied in that. I've got a bunch of work left to deleted all the DTCs that don't apply, plus puzzle out all the differences in the tuning tables.
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