Blown PCM fuse #7 - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Forum Ford Forum

» Auto Insurance
» Featured Product
ยป Wheel & Tire Center

Go Back   Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Crown Victoria | Mercury Marauder | Grand Marquis | P71
Register Home Forum Active Topics Photo Gallery Auto Loans Garage Mark Forums Read Auto Escrow

Ford Crown Victoria | Mercury Marauder | Grand Marquis | P71 Forum for discussion of the Ford Crown Victoria, Mercury Marauder, Mercury Grand Marquis and P71.

FordForums.com is the premier Ford Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 04-07-2011, 09:17   #1 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Blown PCM fuse #7

I just dropped my son off at school and was heading for the highway when I heard a pop and the the motor just died like some one shut off the ignition. I rolled into a parking spot and tried to crank it and it just turns over. I figured the pop was a fuse so I started checking and the #7 was blown. I went to put a new one in and pops just as soon as you get it put into place. Manual says its pcm and some thing else I can't remember right now. Got a ride back to the house and drove my truck to work instead. Sooo, when I get home and start digging into this thing, what and where should I look? I did glance this morning and didn't see any thing that just jumps out at me. Thanks.
justinlogue5_0 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-07-2011, 14:00   #2 (permalink)
2002 F150 XLT
 
Bert's Avatar
 
Join Date: Nov 2008
Location: Oregon
Posts: 9,703
Re: Blown PCM fuse #7

There's a short to ground in the red/light green circuit. Here's a diagram for the circuit. Fig. #7. | Repair Guides | Wiring Diagrams | Wiring Diagrams | AutoZone.com
__________________
Bert
Bert is offline   Reply With Quote
Old 04-08-2011, 06:59   #3 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Re: Blown PCM fuse #7

Well I haven't found any thing that actualy makes me think it was the problem but the car is back up and running. I found some rubbed areas and onewire that was melting against the manifold. The plastic loom stuff was melted but not the actual wires. I have yet to find a bald/bare spot in any of the wires. I have been re-routing wires and poking , prodding etc... Like I said its running now but I am not sure it won't happen again.
justinlogue5_0 is offline   Reply With Quote
Old 04-08-2011, 07:31   #4 (permalink)
Registered User
 
Join Date: Aug 2008
Location: Toronto Canada
Posts: 89
Re: Blown PCM fuse #7

Check the main harness coming from the under hood fuse box.As it goes down and runs around the right bumper and rad support the harness is known to fracture and rub threw the tape.
Stick462 is offline   Reply With Quote
Old 04-08-2011, 08:28   #5 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Re: Blown PCM fuse #7

Quote:
Originally Posted by Stick462 View Post
Check the main harness coming from the under hood fuse box.As it goes down and runs around the right bumper and rad support the harness is known to fracture and rub threw the tape.

Thanks! I really hope I find some thing so I can rest at ease thats its fixed.
justinlogue5_0 is offline   Reply With Quote
Old 04-08-2011, 21:04   #6 (permalink)
Bronco Guru
 
Steve83's Avatar
 
Join Date: Sep 2008
Location: Memphis, TN, USA 38135
Posts: 303
Re: Blown PCM fuse #7

Quote:
Originally Posted by justinlogue5_0 View Post
...this thing...
What kind of "thing" is it? Year, make, model?
Steve83 is offline   Reply With Quote
Old 04-09-2011, 13:06   #7 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Re: Blown PCM fuse #7

1998 Crown Vic (not the police car) 4.6 motor with the cobra intake and coils. I have yanked on, poked, prodded, taped and un-taped every single wire I can see and I found a couple potential problems but nothing that still really jumps out at me. Even while the car was running I wiggled, tugged etc... on wires and every thing is still good. Either I found it with out knowing it or it will show its self again later.
justinlogue5_0 is offline   Reply With Quote
Old 04-11-2011, 08:08   #8 (permalink)
Bronco Guru
 
Steve83's Avatar
 
Join Date: Sep 2008
Location: Memphis, TN, USA 38135
Posts: 303
Re: Blown PCM fuse #7

Who changed the intake? I'd guess a wire is pinched under there, or in back.

From dash fuse 7, the circuit branches to the PATS module (above the fuse block), then goes thru the firewall to the PCM Power Diode, and continues to the noise capacitor, to all the coils. See if the capacitor looks burned.
Steve83 is offline   Reply With Quote
Old 04-11-2011, 08:47   #9 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Re: Blown PCM fuse #7

I put the intake on. No pinched wire, checked it twice already I will check that capacitor and get back to ya. Thanks
justinlogue5_0 is offline   Reply With Quote
Old 04-12-2011, 08:13   #10 (permalink)
Registered User
 
justinlogue5_0's Avatar
 
Join Date: Aug 2010
Posts: 50
Re: Blown PCM fuse #7

Quote:
Originally Posted by Steve83 View Post
Who changed the intake? I'd guess a wire is pinched under there, or in back.

From dash fuse 7, the circuit branches to the PATS module (above the fuse block), then goes thru the firewall to the PCM Power Diode, and continues to the noise capacitor, to all the coils. See if the capacitor looks burned.
The noise capacitor, is that a black looking box roughly 5 inches square under the dash, maybe a little to the right of the steering column? If so its all good. Looks new and flexiable not old and burnt or any thing to make me think its bad. While car was running I wiggled those wires as well and had no change.
justinlogue5_0 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Ford Crown Victoria | Mercury Marauder | Grand Marquis | P71



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Powered by vBadvanced CMPS v3.2.2

All times are GMT -7. The time now is 13:57.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.