Re: 6 COIL DRIVER CIRCUIT 2002 Jeep Liberty V6
As said before, I donīt know the Liberty V6, but in general, the PCM only supplies the ground for the ignition coils. It has a separate driver for each coil and makes and breaks the ground as demanded by the programming and sensor inputs.
There can be a problem with the ignition coil driver #6, but you still should have 12V at the other side of the coil, coming from the ASD relay.
So where did you measure the voltage on? Is it the 12V supply coming from the ASD relay, or do you measure after the coil ( so in fact, the wiring in between the coil and the PCM?
In the last case, I would expect a problem with the coil driver in the PCM. If it will keep the coil connected to ground all the time, then the voltage will be 0.