I have the sub-harness for the ECU and IO box. DPO1 from the ECU itself just has two wires, purple and black, which I connected to either side of the solenoid. I assumed that one of these was a power, and one would be a ground. Not sure how else it would work. Is there a separate power wire that needs to be connected to the ECU to give power to accessories like this? I have also tried to feed the solenoid straight from the battery, just to test and it still doesn't click when I charge the MAP sensor up to pressure. I have tested both of my solenoids though, and both are operational outside of the system.
I am thinking something on the ECU harness itself must be wired wrong, but I am not throwing codes.