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I'm sorry the Expert you requested was unavailable to assist you today. It appears that Tech is currently "Offline". Now that his 15 minute "request lock" has expired, hopefully I can be of some assistance in his place. Sorry for the delay.The most common cause for the code P0351 to set is in most cases caused by a failing coil on the #1 cylinder, if you are you have injector pulse at the coil one quick way to check it is to swap the #2 coil with the number #1 coil and see if the misfire moves. If it does the you need to replace the coil. Check this for me and post back if you need more help and we can work from there if need be.
If your still setting the code P0351 and you are sure the ground switching signal from the PCM is okay then you are likely still looking at a failed coil and or the connection to it. If the coil checks okay then you have either a failing PCM or the wiring from it to the #1 coil, see the steps to retest it in the link below. Copy and paste the link to your browser to open the link..https://dl.dropboxusercontent.com/u/104923897/P0351%20Oct%207.pdf
The pin 26 is a type , the driver signal for the number #1 coil is actually #35 see the connector view in the link below along with the pin location.https://dl.dropboxusercontent.com/u/104923897/Pin%2035%20Oct%207.pdf
I meant the steps I sent you saying you need to check pin #26 was a typo, the driver signal from the PCM to coil #1 is actually #35 as shown in the connector view I sent you.
Take a look at the connector view at Pin #35.
Yes the red /green is the power side of the coil circuit to all the coils, the pin #35 is the drive signal from the PCM, if you do not have an open circuit then you are likely dealing with a PCM problem providing the new coil is not defective. Im not sure an engine misfire would affect the AC performance unless the misfire is placing the computer into Limp mode which would shut the AC down.
If you can only get it to flash with adding power then that would indicated the coil is not seeing power, dose it flash if you do not add power?
No its only going to flash while craning and or running, the green/red send the key on power and the other wire is the ground switching signal from the PCM.
If you checking it with the coil connected by back probing the coil connector at the coil then yes, if that is the case, the coil should also fire if its okay.
Like I said, in most case if the wiring to the coil from the PCM check okay and you have a good ignition source to the coil and a good coil then that leaves a failing computer. There is really nothing else that will set this code besides a bad coil and or the wiring or PCM.
Yes a replacement PCM will need to be flashed which will include key programming.
You can get a reman unit after market for about $300 plus about one hour in labor for programming . For a dealer reman you can expect to pay more but for an exact price you are going to need to contact your local dealer for current pricing.