I have no power to coils. I'm thinking the pcm is bad.
IMO you are looking for your problem in the wrong area. It's not the GEM as the GEM will not prevent the motor from starting.
The PATS symptoms are being CAUSED by the PCM's lack of power. Remember that PATS requires a two way communication between the cluster and PCM.
A bad PCM will not CAUSE a no power condition to the coils.
This is far more BASIC. As in the PCM isn't getting any power. The clues are:
- All dashes on the cluster
- the cooling fan running all the time (fail safe cooling).
- The PCM won't talk to a scan tool.
- This is the most important detail. NO power to the coils.
Tell us about any recent work done to the car. How did you test the fuses? HOW did you check the grounds to the CCRM? Did you test using KNOWN good grounds?
Check for a large black wire with a white stripe that goes around the battery. It connects to a larger round single pin connector and is often disconnected during battery work. This is the CCRM/PCM ground.
Confirm there is "always on" power in and out of all fuses in the battery junction box (BJB=F1). If not STOP and find out why.
Perform all of the following tests and post the results. This will focus additional testing. Test for key on +12 volts at fuse F2.34, F2.2, and F2.8.
If no power in fuse F2.34, look for a possible bad ignition switch.
OBTW, the car will never start unless there's is at least power in fuse F2.34, F2.2, and F2.8. Not to mention, power to the Coil on plugs.
OBTW, IF all fuses are good, AND power to F2.34, AND no power to F2.2, AND the CCRM grounds are good, then the odds favor a bad CCRM.
Note, all tests for power should be done using known good grounds.
99-04 Fuse panel schedule:
http://www.allfordmustangs.com/foru...r-swap-wont-fire-please-help.html#post2669271