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2001 Mustang GT Blowing PCM fuse #26

I have an 01 GT that is blowing fuse 26 under the hood. I removed the fuse and sure enough when I turned the ignition key on it shorted to ground. I removed two harnesses directly under the air filter housing, and each one will un ground the circuit. But i dont have a dealers manual and dont want to tear the harness apart.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1894 Answers

SOURCE: engine wiring harness has shorted

you want the wiring manual for the car is it?

Posted on Jul 24, 2008

chuck943
  • 783 Answers

SOURCE: 2002 Mustang blowing PCM fuses

Ok the 30 amp fuse is the switch side of the PCM relay and the W/BL wire u are disconnecting is the coil side of the relay.So when u disconnect it u are keeping the relay from energizing so this is not the problem.When u unplug the CCRM in the fender u also keep the relay from energizing.
Unfortunatley this could be the worst possible ckt to have a short on because it feeds everything with a 12V feed in the emission system.
It feeds all the coil packs,the coil side of the low and high speed fan relays and coil side of AC relay also in the CCRM.
Now looking at the schematic I think it is possible to narrow your problem down to the coil packs.The other ckts off of this go thru 2 more fuses, fuse 8 and 2 in the interior fuse panel and both of these are 20 amp fuses so they should blow before the 30 amp if the short was after them. Although it could be the CCRM I doubt it would blow the 30 amp fuse because the other feeds there are on the coil side of the relays so that leaves the coil packs.
I would trace the red wire side of each coil pack looking for a pinched wire,they will go back to right side of engine into a square 42 pin connecter.A quick way to test it is to unhook all the coil packs then get you 2 alligator clip wires and a 1157 bulb like in your t/signals. Clip one of the wires on each side of the bulb and hook one wire to power then the other to the red wire pin 24 of the CCRM that u unhooked in the fender(leave CCRM unhooked). Pull the 2 fuses in the interior fuse panel (8&2) then see if your bulb lights. If it does then u have a short in the wiring,if it doesn't then hook each coil pack back up one at a time and see if it lights your bulb.

Posted on Feb 11, 2009

tneubauer
  • 437 Answers

SOURCE: A diagram of a 2003 Ford Mustang interior fuse box?

Fuse Box Diagram

Circuit Schematic

I trust that these are what you are looking for, they are screen captures of the requested information right from Ford.

Posted on Jun 01, 2009

  • 713 Answers

SOURCE: how do i replace tail light harness with socket in a cavalier 01

if you have a complete replacement harness it unplugs behind the felt in the trunk. if it is just a socket with a pigtail clip wires about an inch from old socket and use but splice connectors and use electrical tape to cover them back up with.

Posted on Aug 26, 2009

Testimonial: "thanks"

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SOURCE: 2001 MUSTANG GT BLOWS #11 FUSE UNDER HOOD FUSE

I don't know what #11 goes to,I have been in
electronics for over 22 years and every time
a fuse blows you have a short.
sometimes the fuse panel will tell you what
that one goes to.
Good Luck

Posted on Sep 10, 2009

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