sbwrench

iTrader: (19)

I am trying to get my 411 PCM with 2002 LS6 OS to run all the a/c functions in my LS6 Miata. I am using the three wire pressure sensor and using the wiring diagram from the book GM Gen 3 Powertrain control systems. Everything is making sense except the black wire off the pressure sensor. My diagram calls for it in Red 57 (low reference). Red 57 is already taken up by a purple wire for IAT sensor ground. This jibes with the pinout diagram I am using. Blue 57 is taken up by orange (battery positive) so that's not it.

Anyone know where I pick up my low reference for the pressure sensor? Thanks.

sbwrench

iTrader: (19)

Low reference appears to be just a ground. Can I use one that's open, such as blue 53- trans temp sensor ground- as I am using 6 speed?

sbwrench

iTrader: (19)

No thoughts on this? Just waiting to plug in the black wire. I had hoped somebody had run into this before.

gagliano7

http://lt1swap.com/2001_PCM_CONN_PINOUT.htm Check this out

http://lt1swap.com/pictures/18_ac_comp_controls.gif It looks like here it is spliced in with the iat sensor Red 57

sbwrench

iTrader: (19)

Good find. Thanks very much!! That's exactly the path I went down but haven't started the car to see if would impact the IAT operation yet. Thanks for your help.