If ya Google 'pcm fuse keeps blowing', there's lots of posts about that same problem. Probably a short to ground, but where? If it runs good til the fuse blows again, the PCM may still be okay.
You might need to get it to an Isuzu shop where they can track down the short with their electronic gizmos. Not a cheap answer, but can you find it on your own?
Mark
Check your horn fuse as well.. For some odd reason it is connected to the obd plug and ecu.. Pulling that may help if its shorting there
Fixed... :D
Not too bad of a fix... My interceptor went out... very bizarre... I'm trying to get to the bottom of it now. I can't figure out if my 'red' wire managed to short out somewhere (perhaps on exhaust manifold) or if the unit itself failed. But when I popped the hood and started inspecting for the cause I discovered my red wire had been burnt up... completely. Insulation was off wire was fried.
Popped out the interceptor, cleaned up the wires, popped in the new fuse, and viola. All is well.
Glad it wasn't major.