The 07 MKZ came here to install and program a new PCM but I had to check out the coil driver problem for myself. Cylinder 5 coil control side, the PCM is holding the down at about 3 volts and only makes a slight attempt at ground it. If an open control circuit voltage would be at batt + and if a short to ground either zero volts or the PCM would still be able to pull what's still there to ground. New PCM fixed problem. It looks like new coils already installed. 2nd screen shot is a good coil firing, multi spark (2X).
07 MKZ 3.5 PCM Coil Driver Problem
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