Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I just purchased a 2000 F150, 4.6L ext cab 4x4. It had a…

Customer Question
I just purchased a 2000...
I just purchased a 2000 F150, 4.6L ext cab 4x4. It had a check engine light, so I read the code and it's a P1633 for keep alive memory low. I checked the fuses in the dash, and PCM fuse #2 was broken, so I replaced it. When I did, the theft light, battery light, and airbag light all came on. I tried to start the truck, and got nothing. I pulled the fuse, and the dash returned to normal, and the truck would start. When I replaced the fuse with the truck running, when I turned the key to the off position, the truck kept running. I pulled the fuse and could turn the truck off. The only other thing I noticed was the radio fuse was broken, and when I replaced it, it immediately popped. The stock radio is in the truck. I'm more concerned about the PCM issue. Where should I start? I'm a decent mechanic, but electrical is not my forte!
Submitted: 2 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 1 hour by:
2/21/2016
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 51,553
Experience: 16 years experience
Verified

Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.

I can honestly say I have never seen or heard anything like that. It sure sounds to me like the PCM is faulty in this case but I am not 100% sure. Do you own a scan tool that can see which codes are stored with the fuse in place?

Ask Your Own Ford Question
Customer reply replied 2 years ago
I do. I was thinking PCM as well, but haven't seen that much over the years. I'll see what codes I get tomorrow.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Super

Ask Your Own Ford Question
Customer reply replied 2 years ago
Moose, I'm getting no additional codes with the fuse in. I just made a short video. I started the truck with the fuse out, and all was well except for the check engine light with the same P1633 code. I turned off the truck, and restarted. When I inserted the PCM fuse, the airbag light was the only one that came on. When I turned the key off, the truck stayed running, just like yesterday.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Can you look at the wiring around the fuse box and ignition switch to see if anything looks out of place or if someone has added something aftermarket?

Ask Your Own Ford Question
Customer reply replied 2 years ago
Man, this truck is driving me nuts. No evidence of any aftermarket items. Same issue with the PCM fuse. In addition to blowing the radio fuse upon putting a new one in, I found the brake light switch was disconnected. I plugged it in, and checked and had no brake lights. I put in a fuse in the #15 spot for the stop lamps (which has other things on it), and it immediately popped that fuse too. Want to buy a POS cheap? lol
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

Some of these issues are for sure wire shorts to ground causing immediate fuse failure when replaced. Do you need the wire diagrams for these circuits

Thanks for asking your question and letting me try to help you.

If your confused on why or how to rate me, let me know.

I'm only paid from the deposit you've made when you rate 3,4, or 5 stars.

Follow up/Reply as many times as needed before or after rating.

Ask Your Own Ford Question
Customer reply replied 2 years ago
That may help, but I'm not sure where to begin, even with those. I don't know if these are all related, or if it's just an electrical nightmare.
Customer reply replied 2 years ago
I don't think I'd be chasing those 2 shorts separately from each other, as well as the PCM thing. I would think they have a common issue, like a short in the fuse box itself, or at a single point somewhere. What would you think for a first move?
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

My first choice would be to replace the PCM, though that is based on not performing any diag yet.

Do you understand wire diagrams and wire testing with a multimeter?

Ask Your Own Ford Question
Customer reply replied 2 years ago
I would say I'm on a novice level. I just can't see it being 3 separate problems. It's possible, sure, but a common source seems more likely to me.
Ford Mechanic: Chris (aka- Moose), Technician replied 2 years ago

We can pick one issue and diagnose it and hope it address every issue if you choose. Fuse 15 would be the easiest to diagnose. Let me know what you would like to do?

Ask Your Own Ford Question
Was this answer helpful?
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 51,553
51,553 Satisfied Customers
Experience: 16 years experience

Chris (aka- Moose) is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

24,610 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

51,553 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

Mike V.

Mike V.

Auto Service Technician

1,455 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

< Previous | Next >

Related Ford Questions
2004 ford explorer: radio went..me, i must have mixed the fuses
My radio went out in my 2004 ford explorer, i was checking the fuses but could not find which fuse it was. now when i go to put my car in drive it will not let me, i must have mixed the fuses. I need … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Power windows not working fuse ok
power windows not working fuse ok… read more
chris
chris
Ford tech at a dealer
Associate Degree
2,764 satisfied customers
I have a 01 F150. It turns over and starts runs for 2 secs
I have a 01 F150. It turns over and starts runs for 2 secs then dies. I can hear the Fuel pump run when i turn the key to the on position and during the cranking. But it begins to idle and it stops wh… read more
John Mc
John Mc
Ford Technician
Vocational Trade School
5,495 satisfied customers
No brake lights. The brake light switch is good power to it
No brake lights. The brake light switch is good power to it and out. none to lights. both bulbs are good,also,no third brake light. … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
51,553 satisfied customers
Brake petal fade on F150 2003. replaced brake booster and
Brake petal fade on F150 2003. replaced brake booster and brake reservoir, bled brakes by mechanic still have problem … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Brake pedal going way down. Had brakes replaced on front.
Brake pedal going way down. Had brakes replaced on front. Was told I need a master cylinder. You can pump the pedal up with the engine off and as soon as you start the car the pedal goes to the floor.… read more
3pac2222
3pac2222
nissan master auto tech
Associate Degree
2 satisfied customers
Just replaced the brake pads and now check brake system
just replaced the brake pads and now check brake system warning light is on along with abs … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Cant find the brake light switch location. Brake lights stay
cant find the brake light switch location JA: Okay, I'll connect you to the mechanic to help find that for your Pontiac. Before I do, is there anything else you want him to know? Customer: brake light… read more
Dan
Dan
Dealership Technician
Associate Degree
2,024 satisfied customers
Parking brake will not go off. f-150. 2008. Brakes replaced.
brakes replaced. yes. i have not checked the fluid. … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
51,553 satisfied customers
HOW DO THE PARKING BRAKE CABLE COME OFF THE BRAKE HANDLE. TO
HOW DO THE PARKING BRAKE CABLE COME OFF THE BRAKE HANDLE. TO BE REPLACE. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
24,610 satisfied customers
1999 f350 7.3 diesel hedraboost brakes. Brakes going to
1999 f350 7.3 diesel hedraboost brakes. Brakes going to floor. Put new master cylinder, replaced rear pads blead air from system over and over and over ect. Repaired slides. PS works good. No leaks. C… read more
Diesel Doc
Diesel Doc
Diesel Technician/Shop Foreman
High School or GED
2,495 satisfied customers
Intermittent check engine, ABS and brake light on dash. They
Intermittent check engine, ABS and brake light on dash. They don't come on all at once, sometimes they go off. Only code I can pull is P0305 cyl 5 misfire. Unable to get the scanner to interface with … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
5,253 satisfied customers
The brake pedal went to the floor but the brake reservoir is
the brake pedal went to the floor but the brake reservoir is still full … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,455 satisfied customers
Ford escape My dome light and my back dome lights do not
My dome light and my back dome lights do not work when the door is opened no matter what position I have the switch in. Help… read more
chris
chris
Ford tech at a dealer
Associate Degree
2,764 satisfied customers
My steering wheel shakes while driving or idling...it doesnt
My steering wheel shakes while driving or idling...it doesn't matter if I am accelerating or slowing down...even when I turn the car off, it still shakes for a short time. Already checked the brakes. … read more
Autotech58
Autotech58
Auto Repair Technician
Vocational, Technical or Trade Scho
268 satisfied customers
I have a 2008 ford crown victoria. I have no brake lights
I have a 2008 ford crown victoria. I have no brake lights but signal lights and hazards work. I also cannot get car out of park. I already changed brake switch on the break pedal. I have voltage at th… read more
virtual auto tech.
virtual auto tech.
High School or GED
5 satisfied customers
I have a 2004 Freestar van. The problem is the rear sliding
I have a 2004 Freestar van. The problem is the rear sliding door on the driver's side catches and will not open. This is a manual -not motorized- door. When the door is locked it does not budge, as ex… read more
NicksSticks
NicksSticks
Vocational, Technical or Trade Scho
1,327 satisfied customers
1999 Ford Ranger 4x4 not engaging
1999 Ford Ranger 4x4 not engaging… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x