A/C compressor wiring with later serial data PCM
Thread Starter
On The Tree
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A/C compressor wiring with later serial data PCM SO i know EFI live and HP tuners will change the a/c request from serial data to a straight 12v+ signal, but what pin do I use then to wire it up? I wouldn't think I could use the serial data line. ive got a 2003 ECU, so i go by the earlier diagrams for A/C request?
Mark
Mark
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Joined: Feb 2008
Posts: 503
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From: Ventura, Ca
There are 2 different setups. One for the fixed compressor and one for a variable. If you are using the fixed use the wiring diagram for a truck/express van. This is wired with a pressure switch and cycles the compressor. If you are using a variable you need to wire it with a pressure sensor and wire it like a Camaro/Vette. Pinouts are different and there is a program setting for A/C type.
Just as a heads up we can make any blue green use the camaro/firebird hard wired a/c request and pressure switch. This is by far the best way to run your a/c.
Bill
Bill
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Thread Starter
On The Tree
Joined: Aug 2013
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I dont need the pressure switch, this most likely wont have electric fans, just a mech fan, and it's already got the factory cycling switch thats run the system for 32 years with no issues, even after the 134a upgrade, i still get sub 40 temps after a small initial adjustment of the switch. If I do add an electric fan ill look into the alternate wiring. Right now though I just wanted to have the PCM control the compressor via the cycling switch
I have hptuners and I see with their new software update you can change the ac type. I haven't heard of any real world experience on whether or not you can make the 12v request work with the pressure sensor. The only calibration that I know of that uses a 12v request is the full size vans and they don't use the pressure sensor, they use a cycling switch.
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Verdad Gallardo TECH Enthusiast
Joined: Feb 2008
Posts: 503
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From: Ventura, Ca
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I haven't heard of any real world experience on whether or not you can make the 12v request work with the pressure sensor.
