Question about 2002 Ford Mustang
My 2002 Saleen quit running the other day, and it is blowing 30A PCM fuses like it has a short to ground. So far I have traced it to the white/blue wire that runs from a gray connector by the ECM R/S kickpanel, it runs in the harness behind the dash/radio etc.... and runs to the driver's ignition area, I think it is a PATS receiver or something like that. If I remove that wire from the connector by the ECM, the fuse doesnt blow, but as soon as I touch it POP. Also, if the relay module in the R/F fender is unplugged, it wont blow. Also, its a supercharged S281, so I discinnected all the Saleen intercooler wiring into the relay module to eliminate their electronics. Anyone have any clue whats going on? I cant find that wire shorting anywhere, its inside a big thick harness and I dont wanna take the whole thing apart and trace it, I guess it could be rubbing a ground wire in the harness somehow. It shows it goes to ground through the ohm meter, it also shows the wire has continuity from end to end, so its not broken. I am using Alldata to see the diagram, but it is ridiculous and terribly inaccurate. I am at my wits end.
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
With all due RESPECT to You Are NOT AT WITS end Most People Don't Know To Take the first step You Did Electrical Can Make you Think you Are at Wits End That's All You Got this<<<
The Wire That Shows Continuity and Blows the Fuse & what Component it Controls are the Problem YES Open The Harness There Could Be A Potentual FIRE in there Open it to Be sure it has not Damaged any other Wires and or anything Hasnt Damaged IT ALSO. This Does Not end here so Don't Rate Me Unless You Find this Truely Helpfull Let Me Know You FIND
ANY MODIFICATION TO STOCK WIRING HAS THE POTENTUAL TO DESTROY A VEHICLE IF IT IS NOT DONE CORRECTLY SO BE SUSPICIOUS OF ADDONS Rate Me As Fair As You Feel. Good luck
Posted on Feb 11, 2009
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