Turn all power on to the PCM - full time keep alive power and ignition power. Just ground the pin at the moment you apply all power to the PCM, then release the ground. Immediately let LS Droid attempt to recover it by reading it. Fifteen seconds is not long so you gotta' have your game face on and be ready for this.
It's kinda' funny but I've never bricked one of my five PCM's and in a curious way, I'm sort of looking forward to it as another life experience. So for now, I'm vicariously living this unbricking through you.
Rick
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