A/C turned off in the tune????

Sky Render

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That is an awful fucking idea.

Seriously now. I know you have good intentions and want to be helpful, but you post up some of the most incorrect and now dangerous shit on this forum. Please, if you don't know with certainty that what you're posting is correct, don't.
 

Pentalab

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The OP has a 2006, not a 2011 car. Get the correct wiring diagram, b4 you assume your 06 uses the same format /fuse positions /relays etc..as a 2011 does.
 

deebo05

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Any tuners out there that know what it is called in the tune that turns off the A/C? A certain file name or section of the tune? Emissions test sheet says "A/C refrigerant not supported"

if using sct its under the system switches. there is a/c pressure switch should be 0 and a/c switch "master enable" set to 1
 

redfirepearlgt

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Okay - With the 2005 schematic available -

First again I suggest reloading the previous tune and with KEY ON ENGINE OFF see if the AC compressor is cycling on/off. If you choose not to do that then read on or read on anyway.

With regard to your dual pressure switch - Fuse F14 in the smart junction box supplies voltage to that circuit. It is a 5A FUSE and is hot at Key On (run) engine off according to the prints. Check the fuse. If good and 12 vdc present keep going. With the engine running and the current program loaded (assuming you tried above and it proved nothing), Start the car and find the DARK BLUE WITH YELLOW WIRE (pin 1) that leaves the dual pressure switch connector and see if you have 12vdc on it. If you do, this part of the system is good. If not and the fuse was good and had 12 volts with key on you have three things to consider - 1. AC Clutch cycling pressure switch, 2. dual pressure switch is bad or 3. the system is flat out low on refrigerant.

Moving on if all the above checks are good -

The AC compressor system -

In the bussed electrical Center (I assume this is the box in the engine compartment - been years since I owned an 05-09) you can first check to see if Fuse F49 - 15A is good or not. This fuse will be hot at all times regardless of ignition key position. It provides the actual power to energize the clutch via the A/C Clutch relay. If good next would be to check the relay itself to see if it is bad. You could swap a relay of the same number from another non critical system to see if the A/C unit then works or you could actually pull it and check coil resistance properly with a Digital Volt Ohm Meter. Assuming the relay checks good we move on. The next thing to check would be Fuse F49 - 15A. This fuse provides the control voltage that fires the A/C clutch relay coil (which turns the compressor on) via the PCM. If that fuse is blown that will cause the system to not turn on. If that is good the next thing to check is to see if the PCM is actually providing signal for the A/C Clutch relay to energize. This is where it gets tricky if you aren't comprehensive of some basic electronic control theory.

The AC Clutch relay coil always have twelve volts present on both sides of the coil when not being commanded by the PCM to turn on. PCM controls this by a method called sinking. The PCM when told to turn the A/C clutch relay on will provide the ground (actually a logic low) which completes the path. That means when you check this circuit for the relay to be commanded on the Gray/White wire that goes to eh PCM from the A/C clutch relay in the "Bussed Electrical Center", will read less than 5vdc guessing and more likely closer to 1vdc. If the A/C clutch is being commanded off this wire's voltage will then read 12vdc or the same as the voltage on F49. Hope that makes sense.

Hope this helps you out. Check the fuses I mentioned first. THESE ARE IAW YOUR YEAR OF CAR'S ELECTRICAL PRINTS.

Bruce provided the link in this thread to me. So you can get to it. IT's a great resource.

Remember that the PCM has control of the AC strategy. IT is looking directly at the dual pressure switch circuit which ultimately allows the AC clutch to cycle on and off or to be locked out under low refrigerant conditions. As well the AC compressor as mentioned is bypassed when WOT is achieved or when defrost is selected (if they are still doing that at Ford). So it would be likely possible the tune was altered by the tuner. They should be more than willing to help you iron this out. I dare not ask who it is. I have a hunch. Good luck.

AND SORRY FOR USING THE 2011 PRINTS EARLIER.
 

06JET

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Thanks redfirepearlgt for the AWESOME write up.
Thanks for the info deebo05 but I have an nGauge.
 

deebo05

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ngauge is not tuning software you wont see if its enabled .......since your emission report is showing n/s then your tuner has it turned off, or you have corrupt tune files on the ngauge.
 

06JET

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OK..........This is embarrassing. The first thing in your post redfirepearlgt was to check the F14 fuse. Apparently when I was looking for turn on power for the nGauge I must have removed that fuse and accidentally put it back into F9 "not used". So.............the first thing I did was install the tune after the nGuage was working, before I even cranked the car. Since that time the A/C hasn't worked. There are 2 things so far that my tuner was right about and I was WRONG but blamed my tuner. So, to my tuner, I AM SORRY - YOU were RIGHT and I was WRONG. Both times. You (Jon) are the MAN. I will keep this write up for future use and maybe it will help others that have checked the simple things and need the expertise from this forum. Sorry for wasting your time guys. On to the next problem.

Code P0021. After I run it up to operating temp it is fine until I stop for, just say gas. When I get back in it and go about 4-5 miles down the road the check engine light comes on. I can reset it while driving and it will stay off until next time.
 

408Stang

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P0021 is a camshaft timing code. I believe it's due to a difference in actual (detected) timing versus commanded. That one you might ask the tuner about.... But also check cam position sensors.
 

redfirepearlgt

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Man was glad to help out. Gave me a chance to learn that system from the electrical standpoint. It was fun and helped fill my day in between break down calls at the plant.
 

Barricade

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Awesome info here. Just wanted to also say thanks for the crash course.
 

06JET

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Tuner fixed the P0021. He forgot I have Phase Liminters. I needed them for the Mutha Thumpers but now I went with Detroit Rockers and don't need them. I was to lazy to take them out. New tune and issue fixed. Car runs great. Lund Racing has done a great job on my car.
 

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