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: 54,122
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?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a ford mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 54,122
54,122 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

25,182 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

54,122 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.

Mike V.

Mike V.

Auto Service Technician

1,591 satisfied customers

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

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.

< Previous | Next >

Related Ford Questions
If I got a PO755 code and a P1633 code, can that be the
If I got a PO755 code and a P1633 code, can that be the reason why the car does not accelerate past 40 mph… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
2007 f150 5.4 4x4 I was getting the p1633 code even after
2007 f150 5.4 4x4I was getting the p1633 code even after verifying proper voltage at fuse and pcm. So I ordered another pcm with keys, programmed to my vin and now it won't start. It is turning over, … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
54,122 satisfied customers
Working on 04 Ford Taurus, Diagnostic Code P1633. Check
Working on 04 Ford Taurus, Diagnostic Code P1633. Check engine light was on. … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
2005f150xl v6 ran fine stopped at store and went to start
2005f150xl v6 ran fine stopped at store and went to start and only turned over no fire took intake off and sprayed starter fluid it fired off figured it was fuel pump towed it to house it was the day … read more
Jonbo88
Jonbo88
Ford Transmission tech ford certified
Associate Degree
3 satisfied customers
What is the cause of code P1633 in a 2008 Ford Escape
What is the cause of code P1633 in a 2008 Ford Escape (3.0L)? Is there a specific wire that would trigger the 'check engine' light for this code? Thanks for your help.… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
I have a 2008 ford ranger w 2.3 lb, everything works, but
I have a 2008 ford ranger w 2.3 lb , everything works for engine , but the check eng. Light comes on after start 30 seconds with code 1633 . The cruise control is the only thing that doesn't work not … read more
APenland
APenland
Ford Senior Master Technician
Associate in Industrial Management
3,186 satisfied customers
I have a 2001 mercury sable wagon. Check engine light is on
I have a 2001 mercury sable wagon. Check engine light is on and the computer error code is: p1633, Any idea what we should do?… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
F-350 XLT 5.4 litre gas: Cannot get code P1633 and also pending
Cannot get code P1633 and also pending code P1633 to erase. Tried all connections battery load test is ok, alternator and starter ok. Any other suggestions??… read more
Steve
Steve
Ford tech Specializing in electronics
Associate Degree
1 satisfied customers
I pulled the electronic heater control and had it rebuilt as
I pulled the electronic heater control and had it rebuilt as it would not operate heater. Oh yeah 2003 F150 supercrew. Have P1633 code. Don't have a clue where to go with this one. My alldata refers t… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2001 Sable: check engine light..My code reader..voltage..alternator
On a 2001 Sable, I have a check engine light. My code reader gives a P1633 code [power voltage too low]. The alternator, starter and battery all check OK.Where do Igo feom here?… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
2002 ford explorer: blowing..dealership they..interior lights
i have a 2002 ford explorer and the original problem was fuse #17 kept blowing, leaving me w/o power windows or radio, took to dealership they couln't remedy problem and replaced fuse with circuit bre… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
ford f-150: voltage..sketch of the fuse box..theft..intake
hello good day is APendland in i was trying to fix my ford f-150 heritage with him for three days now, we replaced the fuel pump and still the truck will not start, when we put the genesis computer on… read more
Tim West
Tim West
Service Manager
Computer/ Automotive certifications
16 satisfied customers
What does Ford diagnostic code P1633 mean and how to repair it?
What does Ford diagnostic code P1633 really mean and how to repair? Optional Information: Year : 2001 Make : Ford Model: Taurus Engine: 3.0L OHV V6 Already Tried: Just retrieved the code P1633 "Keep a… read more
Kenny Z
Kenny Z
Ford Senior Master Technician
High School or GED
16 satisfied customers
2006 F250: A TRAILOR THAT BLEW SOME FUSES I..WHITE SMOKE..PIPE
I HAVE A 2006 F250 DISEL POWER STROKE THE OTHER DAY I HOOKED UP A TRAILOR THAT BLEW SOME FUSES I REPLACED THEN THEN STARTED THE TRUCK,THE TRUCK STARTED BOWING THICK WHITE SMOKE AT THE REAR PIPE I CHEC… read more
Diesel Doc
Diesel Doc
Diesel Technician/Shop Foreman
High School or GED
2,495 satisfied customers
2004 ford taurus: Alive Memory) voltage too low can you
i have a code on a 2004 ford taurus that reads P1633 KAM (Keep Alive Memory) voltage too low can you give any suggestions thanks… read more
Richard
Richard
ASE Certified Technician
Vocational, Technical or Trade Scho
1,524 satisfied customers
2004 F150: my alternator..doesnt work..check engine light..Autozone
2004 F150 5.4 Changed my alternator and now my air doesnt work or my radio, and my check engine light is on. Autozone says it has a code problem of P1633. Any help?… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
54,122 satisfied customers
Ford Taurus: check engine light..what the 8 auxiliary output means
I have ford Taurus 2001, check engine light is on, decoder indicates P1633 ( Ignition Supplement Power Circuit low voltage) and 8 auxiliary output. How I can correct this problem and what the 8 auxili… read more
Glenn
Glenn
Senior Master Ford Technician
Associate Degree
1,690 satisfied customers
2001 F250 Super Duty: fault code..it helps, the ABS lamp is lit
What are the potential causes of fault code P1633 on a 2001 F250 Super Duty? If it helps, the ABS lamp is lit on the dash and does not extinguish. ABS does not function. Thanks… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
54,122 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