How JustAnswer Works:

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

Ask Ron Your Own Question

Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 21578
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
7276279
Type Your Ford Question Here...
Ron is online now
A new question is answered every 9 seconds

ZX2 speedometer not working

Expert:  eddie replied 4 years ago.
ill do the best i can to help,first have you checked for codes,fuses(10amp fuse in engine compartment OBD11)the 10 amp fuse in passenger compartment,does the cruise control work,have you checked continuity from instrument cluster at pin 11 connector a blue wire to ground.ground connector is somewhere near starter moter. should be 0 olhms straight path to ground.blue and white wire from vss sensor connect to battery junction box(left side of engine compartment above wheel well).also measure resistance between ground and instument cluster harness connector c pin1(green wire)resistance should be more than 10kohms.If resistanced is more than 10kohms than replace the fuse.Im new to this web site so please good feedback and accept.Ill do what i can to help you.
Customer: replied 4 years ago.
Thanks for the reply.

P0500 - Vehicle speed sensor malfunction.
Reset it twice and it comes back.

No cruise control.

Traced VSS wires to battery junction box - 12v at box and wires in good shape.

I'll check the resistance here shortly.

Is connector C the black harness?
Customer: replied 4 years ago.
double post.
Expert:  eddie replied 4 years ago.
im still studing the diagram,flow chart indicates to check continuityat vss pigtail.If resistance is not170-270 replace the speed sensor,if resistance is 170-270ohms replace the pcm.DTC500 indicates faulty vss,open or shorted circuit,or faulty pcm
Customer: replied 4 years ago.
I'll run to the junkyard and get a pcm tomorrow since i need a clockspring and dome light also.

Just curious, what voltage do the instruments use? I had an 8.5 v reading on the VSS wires at the instrument cluster.
Expert:  eddie replied 4 years ago.
most american vehicle use a 5 volt reference.also if you install a new pcm you might have to reprogam the ignition key and possibly the vin number to the new pcm.8.5 volts doesnt sound right,even with a 12 volt battery.also have you checked the fuses with a test light? will be home about 7 oclock disafternoon.will work with more on this problem.
Customer: replied 4 years ago.
Do you have a pinout diagram you can send me for the instrument cluster and three harnesses? XXX@XXXXXX.XXX
From what i've read, some wire colors are different due to outsourcing.

Facing the dashboard, there are 3 wiring harnesses going to the instrument cluster. On the left (white), on the bottom right (white) and top right (black). Is the top right harness connector C?

Please clarify when the fuse should be replaced:
also measure resistance between ground and instument cluster harness connector c pin1(green wire)resistance should be more than 10kohms.If resistanced is more than 10kohms than replace the fuse.

From your first post:
All fuses checked ok.
The blue wire is +, so i can't check continuity, just 12v.

Resistance is around 235 ohms. Put in a new PCM, no change:
i'm still studing the diagram,flow chart indicates to check continuityat vss pigtail.If resistance is not170-270 replace the speed sensor,if resistance is 170-270ohms replace the pcm.DTC500 indicates faulty vss,open or shorted circuit,or faulty pcm


Customer: replied 4 years ago.
I just remembered that the horn stopped working around the same time as the speedometer. I think i lost ground to the horn, so i attached the negative horn wire to the negative cruise control wire, now the horn works.
Customer: replied 4 years ago.
Relist: Other
Continuing conversation.
Customer: replied 4 years ago.
Relist: I still need help.

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 D USA
< Last | Next >
  • 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 D USA
  • 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. Molly USA
  • 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. BR New 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 P Elm 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. Phil Marysville, CA
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.