Ford

Have Ford Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Ford

1994 Ford F250: fuel injection, automatic transmission..shifting

Customer Question
I have a 1994 Ford...
I have a 1994 Ford F250 4x4 with 7.5 L engine, fuel injection, automatic transmission. It suddenly started shifting erratically and at the same time the spedometer quit working. What is the most likely cause?
Submitted: 8 years ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 6 minutes by:
8/13/2009
Ford Mechanic: Ron, ASE Certified Technician replied 8 years ago
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36,873
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Verified

HiCustomer

 

Thank you for asking your question on JustAnswer.

 

The transmission shift points on your 1994 F 250 are controlled by the PSOM (Programmable Speedometer/Odometer Module ) which is the Speedometer and when it fails, the transmission will act as it acting. The fix is to remove the cluster assembly and have the speedometer repaired (PSOM). In most cases this has to be done at the dealer so the proper mileage can be programmed into the rebuilt unit.

 

 

 

The Programable Speedometer/Odometer Module includes the Speedometer, the Odometer, and the Trip Odometer, all of which are electronically controlled by a programmable integrated microprocessor. The microprocessor receives a speed signal input from the Differential Speed Sensor (DSS), and uses a programmed conversion constant to convert the signal to the standard 8000 pulses per mile speed signal output. The Programmable Speedometer/Odometer Module is serviceable only as a unit.

The electric analog speedometer receives it's input from the anti-lock brake sensor. The liquid crystal display (LCD) odometer is a combination trip odometer and total odometer. The total odometer is normally displayed. To See the trip odometer, press and release the SELECT button on the upper right side of the speedometer. To zero out the trip odometer, press and release the RESET button on the upper left side of the speedometer while the trip odometer is displayed. If the trip odometer is displayed, press and release the SELECT button to return the display to the total odometer value. The speedometer, containing the trip odometer and total mileage odometer, is serviceable only as a unit.

The speedometer is also used to provide Speed signal for correct operation of the vehicle's EEC module and speed control (if so equipped). Because of this, it is VERY IMPORTANT to change the speedometer's internal conversion constant if the size of tires on the vehicle is changed. Changing the conversion constant to the proper value when the tires are changed will also make sure that the speedometer retains the original factory-set accuracy

Ask Your Own Ford Question
Customer reply replied 8 years ago

Is there anything else I should check? A fuse or open circut that has broken the connection to the speedometer?

Ford Mechanic: Ron, ASE Certified Technician replied 8 years ago

HiCustomer

 

Thank you for asking your question on JustAnswer.

 

 

Ford has this TSB that you can check . If this checks ok and the #8 fuse is good then suspect the PSOM.

 

 

Article No.
94-9-12

 

05/04/94

^INSTRUMENT PANEL - ELECTRICAL INSTRUMENT PSOM (PROGRAMMABLE SPEEDOMETER/ODOMETER MODULE) DOES NOT FUNCTION PROPERLY AND # XXXXX FUSE BLOWN - VEHICLES BUILT THROUGH 12/7/93

 

^TRANSMISSION - E40D - HARSH SHIFT - VEHICLES BUILT THROUGH 12/7/93

 

LIGHT TRUCK:
1994 BRONCO, F-150, F-250, F-350

 

ISSUE:
The instrument Panel Electrical PSOM (Programmable Speedometer/Odometer Module) may be inoperative or not function properly and the # XXXXX fuse may be blown. In addition, if the vehicle is equipped with an E40D transmission, it may exhibit a harsh shift. These conditions may be caused by trim screws installed through the 17K745 visor wire between the left hand "A" pillar and the left hand visor bullet connector.

 

ACTION:
Tape the damaged or exposed wire conductor and add scrolling to protect the wiring from trim screw shorts. Refer to the following service procedures for service details.

 

1.Remove the garnish moulding. Refer to the 1994 ECONOLINE, F-150-350, Bronco F-Super Duty Service Manual, Page 01-05A-5, for the removal procedure.

 

a.Inspect the wiring condition against the trim screws.

 

b.Check screws for burn marks.

 

2.If burn mark is found, use electrical tape to protect exposed/damaged wire. Add 1/4" (6.35 mm) scrolling to maximize protection.

 

3.Replace # XXXXX fuse.

 

4.Reset the PSOM to see if it is functioning properly. Refer to the 1994 ECONOLINE, F-150-350, Bronco F-Super Duty Service Manual, Page 13-01A-8, for the reset procedure.

 

5.Reinstall trim. Refer to the 1994 ECONOLINE, F-150-350, Bronco F-Super Duty Service Manual, Page 01-05A-5, for the installation procedure.

 

6.Recheck fuse # XXXXX and PSOM final verification.

 

Ask Your Own Ford Question
Customer reply replied 8 years ago
Last question: It is about 90 miles to the nearest Ford dealer. Is there any chance I can replace the PSOM without the help of a dealer?
Ford Mechanic: Ron, ASE Certified Technician replied 8 years ago
Yes if you can find one , the only thing that will not be right is the mileage will not be actual as this has to be programed in, the dealer usually sends the cluster out to have this done.
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36,873
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
Verified
Ron and 87 other Ford Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago
Thanks for your help.
Ford Mechanic: Ron, ASE Certified Technician replied 8 years ago
Your very welcome, thank you very much as well.
Ask Your Own Ford Question
Ask Ron Your Own Question
Ron
Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 36,873
36,873 Satisfied Customers
Experience: 23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Ron 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

36,873 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

28,139 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

1,380 satisfied customers

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

< Previous | Next >

Related Ford Questions
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
1,380 satisfied customers
What is the purpose of transmission speed sensors on an 08
What is the purpose of transmission speed sensors on an 08 Ford Escape? It runs fine no problem but check engine light is on and was diagnosed at Auto Zone as a bad speed sensor. … read more
Ron
Ron
ASE Certified Technician
36,873 satisfied customers
Transmission fault service now and check engine light just
Transmission fault service now and check engine light just came on at the same time … read more
Edward Clayton
Edward Clayton
Associate Degree
1,033 satisfied customers
EXPERIENCING PROBLEMS WITH THE TRANSMISSION ON A 2009
I AM CURRENTLY EXPERIENCING PROBLEMS WITH THE TRANSMISSION ON A 2009 LINCLON MKS 6 SPEED TRANSMISSION FWD … read more
Ron
Ron
ASE Certified Technician
36,873 satisfied customers
Transmission malfunction warning. About a year. 2012 ford
it is my 23 year daughters car and she hasn't done anything she doesn't know what to do … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
My brake lights are not working. Does the brake fluid have
Does the brake fluid have anything with the lights not working? … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,238 satisfied customers
Transmission seems to be stuck in neutra. Transmission will
Don't know. Tried changing fuses, disconnecting battery, checked fluid. … read more
roy
roy
Associate Degree
3 satisfied customers
How do I reset the mileage counter and "change oil soon
How do I reset the mileage counter and "change oil soon light",back to 0 miles and unlit? How can I get a "diesel supplement " for my F350? Ford doesn't have it. What weight synthetic oil should be us… read more
Jaybird61
Jaybird61
Master Automotive Mechanic
2,238 satisfied customers
Our 2011 F-150 Ecoboost is not getting the good gas mileage
Our 2011 F-150 Ecoboost is not getting the good gas mileage it used to get. We towed a small trailer from North Carolina to Florida. We heard a noise and the check engine light came on. By the way, ou… read more
Ron
Ron
ASE Certified Technician
36,873 satisfied customers
Wlhen applying brakes Brake pedal initially hard to
Wlhen applying brakes Brake pedal initially hard to push...once it lets go then pedal goes down by itself to apply brakes....then to release must put toe under brake pedal to pull upwards. Then it is … read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,380 satisfied customers
2004, f150, 5.4 engine two wheel drive. The transmission
2004, f150, 5.4 engine two wheel drive. The transmission slips at around 45 mph as if it shifted into neutral, when it slows down to around 20-25 mph the power returns. Just changed fluid and filter a… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
Can't read mileage but speed odometer works, numbers won't
can't read mileage but speed odometer works, numbers won't show for our 2005 freestar ford van … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Replaced rear calibers and now spongy brakes when engine is
Replaced rear calibers and now spongy brakes when engine is operating, hard brake pedal when engine is off. The web site indicates replacing ABS is the solution to the problem. What are your thoughts?… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
On a 2013 Ford Edge 3.5l engine, the brake pedal is heavy
Hello, on a 2013 Ford Edge 3.5l engine, the brake pedal is heavy and making a whistle noise when pressed. I know that is something wrong with the vacuum assistance and I just came to find out that thi… read more
Mike V.
Mike V.
Auto Service Technician
High School or GED
1,380 satisfied customers
Is it normal for a 2013 with mileage of 64K to have to have
is it normal for a 2013 with mileage of 64K to have to have the entire motor replaced. I'm sick. We just bought the car used 6 months ago. 3 months after we bought it the flashing engine light came on… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
My odometer is black no light to see the mileage. The
My odometer is black no light to see the mileage JA: Just to clarify, what are the exact lights you're talking about? Customer: The odometer is of reading its just black JA: What is the model/year of … read more
Dan
Dan
Dealership Technician
Associate Degree
1,779 satisfied customers
Will the engine and transmission. From an 08 focus SE fit in
Will the engine and transmission. From an 08 focus SE fit in an 04 SE focus … read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
28,139 satisfied customers
We have a new rebuilt engine, transmission on our 2004 Ford
We have a new rebuilt engine, transmission on our 2004 Ford f150. Replaced the pcm and now it won't start. Lights come on, but engine won't turn over. … read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 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