Hi everyone, I'm looking for some help or insight from people out there that may have experienced this before. All my diagnostics keep pointing at the pcm
My problem is when you turn the ac
on in the cab the compressor isn't engaging. I started with all the simple things like fuses and relays. And checked to make sure I have the correct 1.1kg charge in it. I even printed the wiring schematics for the 6.0 engine harness and the entire ac
system. I have power everywhere I'm supposed to according to the schematic but it seems as though the pcm
output to the relay isn't working. I can even jump the relay with my power probe and it will engage the clutch. If I jump it at the high pressure switch it engages. I jump it on the pcm
input at the high pressure switch it engages. I hook up our scanner at work and look at the pids for ac
and its saying "ac not requested by driver" when the switch is on. So I'm kinda lost and getting frustrated.
A little about the truck.
April of 03 6.0 5r110 f450
Now using a 05 cummins and 13 68rfe auto
wiring is 100% original ford minus the compressor pigtail
New compressor, condenser, accumulator, high pressure switch, clutch cycling switch and hoses all when the cummins was installed.
172k on the chassis. 117k on the motor. 1300 miles since the swap.