I have been having some issues with my pcm. Been working with Ford tech support tracking down the fault. They seem to think the issue stems from my MAF sensor. Really long story but I do not agree.
One of the test they had me do today was to unplug the MAF sensor plug, turn the key to the run position(one click to right) but do not attempt to start and put a multi meter on the green wire in the MAF plug to read the voltage.
They indicate it should be 12V with the red probe touching the green wire and the black probe to a frame ground. The green wire is the third one over in the plug. Mine indicates 0.45V for the green wire and the one next to it which is purple shows 5.0V.
(now for reference I have a 2012 F150 with a 5.0 I unplugged it and checked that wire and it was in fact 12V)
My belief is because the way the coyote and Ron Francis harnesses are integrated and for whatever reason that is beyond my understanding I don't think it gets the 12v at the MAF until you are actually trying to crank the motor not in the accessory position as Ford is telling me it should be. Getting Ford tech support to agree with that assessment is another matter because naturally they do it every day and most likely think I am a moron when it comes to this stuff. (probably a fair assessment on their part! haha)
I am trying to collect data to see if other coyote users are getting the 12v or something like I have. I have messaged with another forum member and his results mirror mine. Furthermore I have had flawless operation up until now and don't believe anything has changed with regards to the voltage going to my MAF sensor.
So if anyone has a running 2015 coyote in there garage and would be willing to unplug the maf sensor and turn the key to the run position only and read the voltage I would be very appreciative to hear your results. Please post them here.
Thank you to anyone that can help.