Went to a dealer for a no start condition, They told me it was a bad ECU & Immobilizer. I replaced both, the donor car is identical to mine 2000 GT 5speed
Went back to dealer and the told me they still have no communications with any part of the car.This time they told me it was either a bad ETAC(Body control module ) or a wiring issue.
Any ideas?

 

check fuel see if your getting pressure, check spark, check the injectors?? just an idea thrown out there.

 

i have seen a few pcm's go bad in that model, and you do have to replace the immobilizer ecu with the pcm for that year model. was the key programmed to the new pcm that you installed?? that can cause a no start issue as well. your key has a computor chip in it that has to be programmed to the pcm, when you replaced the pcm it had to be programmed again, thats something to check on. also, a bad etac's unit will not cause a no start issue. etacs controls the windows, door locks, alarm, and lights. i would suggest you look at the key issue, if that doesnt pan out, see if there are any codes in the pcm, such as cam or crank sensor codes, also will cause a no start issue. good luck!