Ecm fuse problems

You failed ECU 101.
it says on page one in the FSM
do not replace the ECU until all pins feeds are checked for shorts.
car books too, and has been true ever before caremakers know what electronics is.... (pre 80s)

on most ECU, the key factory (im a retired, ET)
the outputs are key
if you short any output the current goes to infinity and the ECU burns up its driver transistor, fast.
one really new cars they have smarter transistors now that have overload roll back features. (i can cite examples>)

they scanned it , and the ECU will NO commicate
this is normal with blown fuse to ECU , blown fuse to pin 16 in the DLC scan port (car) or BLOWN to hell ECU. fact'
i can fix ECU, so ,now this well, retired, now.

there are like 10-20 (or more) output transistors on all ECU.
1 for each injector, v8 (unstated) is 6 transitors
and many more, for other things, called Actuators.
ISC? EGR? VSV valves, RELAYS. and more.

one top cause is injector shorts or the wire to it shorted to 12vdc.
The Injectors have 12v power all the time.
the ECU grounds (transistor) the injector to fire it. (energize it)
of you short those 2 wire, BAM. kiss off one ECU.
on almost all cars. on the road. (EFI)

so you say, what can i do.
easy.
get a ASE mech in the loop
or
DIY
DIY, you need a meter, to check all wires on the ECU.
for shorts to ground. or 12vdc ignition feed, battery NEG lug removed.
that is what you do. and inspect every inch of the injector harness for damage.

if you and pulled the ECU lid like i do an sea what part blew.
stinks, burned, cracked transistor or CHIP driver.
then that is what was overloaded
i then use my ohmeter, (Rx2) DMM, and find what external
pins connect to the BLOW, chip,
if its injectors, now you know the why.
if that dont pan out
i then open my FSM
i turn to ECU pinout page. i color each output in yellow highlighter.
(printed out page)
i then pull ECU.
battery is still not connected
i then ring out each output 1 by 1, each output for shorts.
so , what is a short.
that is easy. 0 ohms is short.
each acuator (fsm) has a coil ohms spec.
some are 30 for VSV
some are as low at 6 ohms. coils on relays.
but non are 0

if really unlucky, been there. we wiggle he harness if all outputs are good , we wiggle the harness, and bam, its shorted
on one car injector 6 was blowing the chip, line 6
so i put a 7amp fues on that line, before new ECU
now the fuse blew, so i found a well hidden harness short.
under and intake manifold, very hard to reach, (man had to come off)

that is how i do it.

if the line 6 blows, we replace the injector first.
as SOME Can short, only hot. do not waste an ECU for
1 funky injector, rebuilt are cheap, dirt cheap.

how is that, ask questions.

Well if you've had your ECM burn and got it changed and the same thing happen again then there might be a pilled positive wire exposed to the body or the chassis of your car touching at some point,my best advice is to trace all positive heavy wires leading from the starter and under the fuse board as well.i hope this helps thanks