PCM Won't Reset
PCM Won't Reset For some reason my PCM will no longer reset by pulling the 2 fuses (PCM IGN & PCM BAT). I've done it this way dozens of times before. For some reason now when I pull the two fuses with the ignition in the on position all electrical power stays on... dash stays lit and everything 
. I had to disconnect the battery to do the reset.
Can anyone shed any light as to why this would happen? I have no idea...
. I had to disconnect the battery to do the reset.Can anyone shed any light as to why this would happen? I have no idea...
Huh... power cable? Do you mean the neg battery cable?
If so yea, obviously that works. But I still don't understand how the hell the electrical system stays active with no fuses in the PCM BAT & PCM IGN slots? It NEVER did this before. Concerns me because what if for some reason I get a short in the elec system. Seems to me the fuses aren't going to do their job now.
I did have some HP Tunning done recently, not sure if this has anything to do with it or not.
If so yea, obviously that works. But I still don't understand how the hell the electrical system stays active with no fuses in the PCM BAT & PCM IGN slots? It NEVER did this before. Concerns me because what if for some reason I get a short in the elec system. Seems to me the fuses aren't going to do their job now.
I did have some HP Tunning done recently, not sure if this has anything to do with it or not.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
unless you rewired the car, by pulling the fuses it should kill the power to the PCM ...
Not sure about all the gauges and such though... I never paid attention to mine when I would clear it that way... I just pulled the fuses, waited 10 seconds, then turned the key on and off a few times for good measure....
HPT can't rewire the car to bypass the fuses
it'd have nothing to do with this...
And again unless you rewired the car recently the fuses should be functioning properly....
Try starting the car w/those fuses out... it'll crank and crank... but not start... that'll tell you that the car can't talk to the PCM w/the fuses removed
Not sure about all the gauges and such though... I never paid attention to mine when I would clear it that way... I just pulled the fuses, waited 10 seconds, then turned the key on and off a few times for good measure....
HPT can't rewire the car to bypass the fuses
it'd have nothing to do with this... And again unless you rewired the car recently the fuses should be functioning properly....
Try starting the car w/those fuses out... it'll crank and crank... but not start... that'll tell you that the car can't talk to the PCM w/the fuses removed
Originally Posted by horist
Try starting the car w/those fuses out... it'll crank and crank... but not start... that'll tell you that the car can't talk to the PCM w/the fuses removed
