SpeedyEFI (speeduino) 99-00 PNP AC Idle Up Issue
 

I've been messing around with getting my SpeedyEFI (speeduino) 99-00 PNP up and running. So far, so good except for the AC idle up functionality. I have managed to figure out the pin mapping, but it doesn't work when I select the input in Tuner Studio. If I remember correctly it either engages idle up when the compressor is not engaged or does not respond when the compressor is engaged (behavior being reversed depending on if you reverse the input in tuner studio). Is there something hardware wise that needs to be done? Im kind of at a loss and there doesn't seem to be much good info on the web about the SpeedyEFI stuff.
Thanks in advance!

I realize this is a bit late, but I had a similar issue. I assumed that the wiring in the base SpeedyEFI map had the AC input wired into the board and selected for Idle Up functionality.
When I had Idle Up enabled, even if AC was off, I would occasionally hear a sound like someone was drumming on a plastic tub coming from my intake.
I saw that the IAC duty cycle was jumping around sporadically, even with the AC off.

I messaged SpeedyEFI about this. It turns out that the AC signal is NOT wired into the SpeedyEFI units at this time. It sounds like they'll be adding that on the next revision of the boards. VSS is also not wired up, which was another thing I assumed was.
Unless you wired the AC signal into the SpeedyEFI using one of the extra input headers on the board, I'm pretty sure you're ECU has no idea when the AC is being turned on or off.

Maybe your situation is different, but I figured I'd share my experience. I agree, there's not a lot of documentation out there for the SpeedyEFI units. Messaging them works, but we might as well get this info out onto the forums so people can reference it at will.