Truck PCM A/C wiring
05-29-2010, 06:02 PM
#21
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I was going to disregard the high pressure switch as I am confident in my fan performance.
I have my low pressure switch (universal older style) wired inline with clutch clutch relay activation circuit (pin 43).
The system is charged.
I am about to plug in Hptuners and see if I can force ground at pin 43.
This is bullshit honesty. Pretty pissed I just paid too much to have A/C lines made and yet again my questionable mail order tune is causing issues.
I have my low pressure switch (universal older style) wired inline with clutch clutch relay activation circuit (pin 43).
The system is charged.
I am about to plug in Hptuners and see if I can force ground at pin 43.
This is bullshit honesty. Pretty pissed I just paid too much to have A/C lines made and yet again my questionable mail order tune is causing issues.
05-29-2010, 06:22 PM
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I just forced it on through HPtuners and it worked.
Looks like we are in the same boat so to speak.
Who programmed your PCM?
Is there any chance one of the pressure switched provides power and not ground to the harness?
I really dont have an issue hardwiring the system and using the low side switch to cycle the compressor. I guess I could just go ahead and wire the fan relays to my in dash A/C switch to handle them. Or maybe lower the fan turn on temp to some stupid low value.
Looks like we are in the same boat so to speak.
Who programmed your PCM?
Is there any chance one of the pressure switched provides power and not ground to the harness?
I really dont have an issue hardwiring the system and using the low side switch to cycle the compressor. I guess I could just go ahead and wire the fan relays to my in dash A/C switch to handle them. Or maybe lower the fan turn on temp to some stupid low value.
Last edited by NoClassic; 05-29-2010 at 06:28 PM.
05-29-2010, 10:42 PM
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I went ahead and grounded both pins 11 and 55 and there was no change.
Is there any chance that my PCM could show to be from a 2001 silverado because of the VIN, but in actuality have a full Camaro program on it?
I am thinking this may be the case because I had my tuner program the PCM to function with Camaro injectors. It also shows that I have both high and low speed fan control in HPtuners, which I did not think was possible with a truck program.
Is there any chance that my PCM could show to be from a 2001 silverado because of the VIN, but in actuality have a full Camaro program on it?
I am thinking this may be the case because I had my tuner program the PCM to function with Camaro injectors. It also shows that I have both high and low speed fan control in HPtuners, which I did not think was possible with a truck program.
05-30-2010, 05:27 AM
#27
I went ahead and grounded both pins 11 and 55 and there was no change.
Is there any chance that my PCM could show to be from a 2001 silverado because of the VIN, but in actuality have a full Camaro program on it?
I am thinking this may be the case because I had my tuner program the PCM to function with Camaro injectors. It also shows that I have both high and low speed fan control in HPtuners, which I did not think was possible with a truck program.
Is there any chance that my PCM could show to be from a 2001 silverado because of the VIN, but in actuality have a full Camaro program on it?
I am thinking this may be the case because I had my tuner program the PCM to function with Camaro injectors. It also shows that I have both high and low speed fan control in HPtuners, which I did not think was possible with a truck program.
You can have hi and low speed fans with the truck OS, but you need to make sure the recirc door switch is shut off in the OS. I know HP tuners couldn't do this part of the tune, but by now they might have caught up, with the rest of the programing world and added this feature.
If it was tuned with HP Tuners, normally the vin has to match the OS that is being run. Another one of their great features. Yes Bill, I realize you think it was the only way to do your model / year license scheme, but it isn't, so you can keep on believing that, along with some of the other things you think you know.
05-30-2010, 11:54 AM
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The PCM was tuned using LS1edit. Not sure if that changes what the PCM may appear to be in Hptuners.
Joe you are saying the pin 33 (recirc door) would be programmed to ground the high speed fan relay?
Joe you are saying the pin 33 (recirc door) would be programmed to ground the high speed fan relay?
