My PCM 2.1 cycles on and off for about 20-30 minutes and then it operates perfectly. If i stick a small ceramic heater in the car for 20 minutes before driving, it also works A okay.
I have field stripped the PCM at least 2x now and at least know how to do that pretty ez.
I have concluded that it is a cold solder joint somewhere and will try inspect the large square chip as noted by the OP but, mine is soldered via the bottom of the board. All these looked okay last sunday when I took a cursory look.
It's all sort of a crap shoot, but summer may be here sometime and the unit will probabl