Those codes under 20 are processor codes
Your code15 basically says there is no power on pin 1 of the processor and the ROM is gone
There are pinpoint tests for that
*I will post the car one if it is different
Well, no power on pin 1 of the processor means I am surprised it even runs
So, popping = yes
I will check the 5.0 car chart and see if a code 54 exists
I will try to delete the truck pages
Here are the Mustang SEFI 5.0 pages
They schematics are all different depending on engine and SEFI or not it looks like
Ok this I just had it dyno tuned and this morning I pulled the codes which were 15 and 85 because I forgot to tell him to delete the cansiter. I was still on 19lb injectors when dynoed but decided to go with the 24's and that is all I replaced after inspecting the ecu witch is missing prong...
stangnet.com
I used this tread from stang net to test wiring ecu first ground test from black/white wire from self test to -battery I got 1.4 ohms. Went to Check 12 volts while ecu battery connected from ground in car to pin 1 on ecu i get 12 volts using battery ground .Pulled ecu out tested from sti black/white wire to pin 46 getting 1.1 ohms to 1.4 ohms(fluctuating) Then tested from pin 40 to 46 and pin 40 to 60 on ecu I got 0.6 ohms.From Sti single wire red/white to pin 48 on the connector no ecu I got 1.1 ohms. Should I be worried about the ecu itself because it’s asking for less then 1.5 ohms and I’m getting 0.6? From pin 46 to 40 0.6 ohms and from pin 46 to 60 same 0.6 ohms. Too low?