Join Date: Apr 2007
Location: Atlantic City, New Jersey
1999 GT PCM or CCRM, AC Problem
I have 1999 GT, my AC is not working, tried to bypass high and low pressure switch's still no power to the ac clutch. Hot wired ac clutch and ac works great, but I know can't run it like that, but at least I know ac clutch is good.
I tried the test for the ccrm.
Pin 23, that is for the ac clutch. I tested it and has 12v, this should indicate the ccrm is okay. Test pin 21 and there is no power. I was told that it has to have 12v. Pin 21 supply's the 12v for pin 23, I do not how I could have 12v to pin 23 if there is no power at pin 21. I also checked pin 22, but there is no power either. That indicates a the pcm has grounded the relay for the ac clutch.
I have check the fuse and wiring looks good. I have also read there is an open circuit 198, DG/O which cause no power to pin 21. I have no idea where this circuit is.
So my questions is could the pcm be bad or is the ccrm bad.
Last edited by Keno; 07-30-2008 at 10:57 PM.