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 CarDoc Your Own Question

CarDoc
CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6426
Experience:  20 years of experience working with European cars. Independent European shop owner and technician.
14582033
Type Your Car Question Here...
CarDoc is online now
A new question is answered every 9 seconds

I have a p1590 code on my 2003 land rover, and cant find what

Resolved Question:

I have a p1590 code on my 2003 land rover, and cant find what that is anywhere. do you know?
Submitted: 1 year ago.
Category: Car
Expert:  CarDoc replied 1 year ago.
Hello, I'm Jason.
I will do my best to answer your question quickly and accurately using the information you have provided.

Typically, this is due to a faulty ABS control module. I'll post the rest of the code information below.



Rough Road Signal Description
The SLABS/ABS control module transmits a PWM signal indicating rough road for misfire detection disablement.
The ECM has input diagnostics for this signal.

There are three plausibility checks of the PWM signal during which a fault is detected if:
The PWM signal is greater than a threshold indicating an electrical short to battery positive.
The PWM signal is less than a threshold indicating an electrical short to ground.
The PWM signal is greater than 44.92 % but less than 55.08 % indicating an error with the SLABS/ABS control module.

DTC P1590
Rough road signal implausible Drive cycle A:Signal implausible.

Possible causes by suggested order of priority:
Connectors C504, ECM C637 (B).
Open circuit - C637/34 (RG) to C504/4 (RG).
ABS fault.
Connectors C504, ECM C637 (B).
CONNECTOR
Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.
Open Circuit - C637/34 (RG) to C504/4 (RG).
OPEN_CIRCUIT
Check resistance > 1M Ohm
ABS Fault.
CHECK THE FOLLOWING:
Carry out diagnostic checks on the ABS system. POSSIBLE FAULTS
Faulty ABS ECU or wiring.
Customer: replied 1 year ago.

could it be a bad positive battery terminal (coroded). because all my lights are on. ABS,tc,brake,and down hill lights.

Expert:  CarDoc replied 1 year ago.
Extremely unlikely that a corroded terminal would cause that, unless it's causing an extreme low voltage signal to the ABS computer. If the car is starting, then this is not the cause.

Also, with regards XXXXX XXXXX other lights on, that's normal. If there is any fault at all with the ABS system, all of the others are affected, as they require information from the wheel speed sensors, and ABS computer to function correctly.
CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6426
Experience: 20 years of experience working with European cars. Independent European shop owner and technician.
CarDoc and 5 other Car Specialists are ready to help you

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:

 
 
 
  • 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
< Last | Next >
  • 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
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician