I've got a Microtech ecu and am attempting to get the ac working.
To test the system, I sent 12v to the compressor, clutch engaged and I've got cold air.

I'd like to figure out how to turn on via the ac button on the logicon so that I can keep all of Mazda's safety features (namely the pressure switch).

I no longer have the stock ecu or wiring. How would I wire the ac button on the logicon to engage the compressor (thru the pressure switch)?

 

the stock ecu has a a/c signal in, and an a/c signal out, you want to cross those two wires, they can be found in the FSM.

blue Orange in.. from the pressure switch goes into ecu..
blue white out... a/c signal on comes out( depending on rpm/load) goes to relay.

im not sure if one is voltage and one is ground, but measure the blue orange.. and then give the blue white power(which SHOULD make the compressor clutch kick on.) if the blue orange has 12v with the a/c button on, and the blue white getting 12v turns the a/c on.. then there you go.

if you want to go thru the ECU.. someone with microtech will have to help. thankfully theres alot of those guys.

 

here's a basic hack to the system to bypass the factory ECU, only takes a couple minutes to do and retains all the failsafes. ignore that it is in the haltech subforum, it works with all standalones if you don't want to figure out a method to tie it into the standalone's controllable outputs. IMO the only reason you would want to do so is to turn off the system in the event of an overheat situation.

https://www.rx7club.com/haltech-foru...ain-c-1045822/