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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Keeps burning a fuse, then anti theft light goes on and car

Customer Question

Keeps burning a fuse, then anti theft light goes on and car won't crank/start
JA: Have you checked the fuses? Have you tried to reset the computer?
Customer: Yes, I've replaced a 7.5 fuse twice, the car seems to work fine for a day or two then stalls to a stop and all over again
JA: What is the model/year of your Ford?
Customer: 2006 fusion 3.0
JA: Are you fixing your Fusion yourself? What have you tried so far?
Customer: ive scanned it but gives me many codes
JA: Anything else you want the mechanic to know before I connect you?
Customer: The car starts, and runs fine, for a while but seems to stalll at very low speeds like when barely letting go of the brakes to roll forward
Submitted: 1 month ago.
Category: Ford
Expert:  eric remington replied 1 month ago.

o​k what fuse is it? and I would record all the codes and then erase them and then drive it see what comes up first, code wise...make sense...some times the initial code or codes will cause other codes to occur so erase drive for a minute or so and recheck...and tell me what codes come up first and let me know the list that you had as well...ok?

Customer: replied 1 month ago.
It's a 7.5, location 26 under the dash, and yes I erased all the codes, but it will take a day or two to burn it again
Customer: replied 1 month ago.
I should've written them down, bummer!
Expert:  eric remington replied 1 month ago.

yeah

Customer: replied 1 month ago.
Most of them said that the car was running lean and others said hat it was running rich, and one was for the evap
Expert:  david craig replied 1 month ago.

Hi Im David, is the fuse labeled?

Customer: replied 1 month ago.
No, but I looked it up and it says it's the pats module
Expert:  david craig replied 1 month ago.

ok, thats why you arent starting for sure. standby

Customer: replied 1 month ago.
I replaced it and the car runs fine for a day or two then it burns again
Expert:  david craig replied 1 month ago.

ok

Expert:  david craig replied 1 month ago.

let me pull a wiring diagram, standby

Expert:  david craig replied 1 month ago.

ok, its going to be this fuse if im not mistaken

Customer: replied 1 month ago.
number 26
Expert:  david craig replied 1 month ago.

you need to pull the fuse, disconnect the pats reciever and check that wire for a high resistance to ground

Customer: replied 1 month ago.
Ok, is that done with a volt meter? And it's the ground you want me to check right?
Expert:  david craig replied 1 month ago.

yes. with a volt meter. select ohms. put one lead on the wire and the other lead to a ground

Customer: replied 1 month ago.
Is there supposed to be a relay down there, because there is one and a lot of wires are cut off, I think someone before me tried to eliminate the pats, will send a pic, stand by
Customer: replied 1 month ago.
Expert:  david craig replied 1 month ago.

oh brother

Expert:  david craig replied 1 month ago.

no there no relay for the pats

Customer: replied 1 month ago.
Did you see the pic?
Expert:  david craig replied 1 month ago.

yep

Customer: replied 1 month ago.
Any suggestions now that it's no longer stock, :(
Expert:  david craig replied 1 month ago.

heres the location of the pats connector and the pinout of it, its the grey/orange wire that is what you are looking for

Expert:  david craig replied 1 month ago.

that doesnt look like the pats wires

Customer: replied 1 month ago.
Let me ask you something else, could the car be trying to activate pats and on the process the car somehow tries to stall at rolling speed i.e. Less than mph
Customer: replied 1 month ago.
That's a gps module, but why the car is paid off
Expert:  david craig replied 1 month ago.

no mph has nothing to do with it. check the grey/orange wire for a high resistance short to ground

Customer: replied 1 month ago.
It cuts off power to the ifgnition switch
Expert:  david craig replied 1 month ago.

thats the gps?

Expert:  david craig replied 1 month ago.

so, youve had this car for how long and when was it paid off and did you know there was a gps on it?

Customer: replied 1 month ago.
cheap kind, used car lots uses them when the sell a car on payments, I'm thinking they forgot to take it off and now it's blowing that fuse whenever the gps sends its signal, oh man! Also I can't seem to find the module I already took the cluster off and nothing, could it be behind the stereo?
Expert:  david craig replied 1 month ago.

standby ill get you the location

Customer: replied 1 month ago.
I bought the car cash from a person, about a year ago, the car started hesitating and shake specially when taking off at low speeds, the scanner says the car is running both rich and lean, and that the evap is also bad, I cleared the codes then about two days later the fuse burns and everything starts all over again
Expert:  david craig replied 1 month ago.

oh yea, its part of the igintion bezel

Customer: replied 1 month ago.
Found it, let me check that resistance
Expert:  david craig replied 1 month ago.
Expert:  david craig replied 1 month ago.

that didnt work... hmmm

Expert:  david craig replied 1 month ago.

ok there ya go

Expert:  david craig replied 1 month ago.

remember have the fuse pulled when checking fior resistance

Customer: replied 1 month ago.
I placed the multimeter on 2000 ohms and it reads 648
Customer: replied 1 month ago.
If I put the ohm meter on 200 it gives me a 118.0 then back to 1
Expert:  david craig replied 1 month ago.

200 the lowest setting?

Customer: replied 1 month ago.
I don't have a better one, :(
Customer: replied 1 month ago.
What did you needed it to be?
Expert:  david craig replied 1 month ago.

thats fine. but if you have the fuse pulled and the connector off the pats and you are reading 118 ohms you have a high resistance short to ground on that wire and thats why the fuse is blowing eventually

Customer: replied 1 month ago.
Ok, meaning?
Expert:  david craig replied 1 month ago.

meaning that wire is rubbing on something or tied into another system and it shouldnt be

Customer: replied 1 month ago.
Does it run to the ignition switch ?
Expert:  david craig replied 1 month ago.

no. it runs fron the pats to the fuse

Customer: replied 1 month ago.
It looks well insulated by electrical tape, I'm going to remove it all to look at the entire wire hoping to find something
Expert:  david craig replied 1 month ago.

ok, because that wire should not be reading anything to ground

Customer: replied 1 month ago.
Good morning, I got a new multi meter and tested the cable again, it reads .000
Expert:  david craig replied 1 month ago.

good morning. ok, well since that wire reads no continuity to ground then the only thing that can be causing the eventual burning of the fuse is 1. the PATS module or 2. the power source to the other side of the fuse

Customer: replied 1 month ago.
Oh boy! Looks like in in for more trouble ahead of me
Expert:  david craig replied 1 month ago.

im looking for the power source for you

Customer: replied 1 month ago.
Is there a way to check if the pats is bad?
Expert:  david craig replied 1 month ago.

not without a Ford IDS scan tool

Customer: replied 1 month ago.
Ok
Expert:  david craig replied 1 month ago.

the upstream power source isn't the issue or you would have a lot more fuses burning, so I am saying the PATS module is the issue here.

Customer: replied 1 month ago.
Ok, but again that can only be fixed with an ids scan tool?
Expert:  david craig replied 1 month ago.

it needs replaced. only an IDS can to can read the module faults

Customer: replied 1 month ago.
Before I go and get someone to do this, what are the other three wires for? I ask because the gps was connected to a purple and black that looks like coming from the pats
Expert:  david craig replied 1 month ago.

purple and black is ground. they are probably are sharing the same ground. the other 2 wires are data bus wires to the instrument cluster

Expert:  david craig replied 1 month ago.

hows it going?

Customer: replied 23 days ago.
Sorry for the late response, well it keeps burning the fuse, and also the check engine lit up, I checked the codes and are a lot, I'm thinking that the computer or harness is bad and somehow shorts the anti theft
Customer: replied 23 days ago.
I forgot to say that I didn't take it to the dealer, because it was expensive. I kept swapping the fuse, at least until I get some money to have it checked properly