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 sprinkles08 Your Own Question

sprinkles08
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 16609
Experience:  ASE Master and Advanced level certified. Factory trained with 14 years dealership experience
9825021
Type Your Car Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Nissan x-trail: I have a Nissan X-Trail automatic transmission

Customer Question

I have a Nissan X-Trail automatic transmission yr 2001, the problem with it is after a short while of driving it will suddenly shift from a fast gear to gear 1 and get stuck there, the revs will go up and naturally the car will slow down. After a few minutes of parking with the engine switched off and starting off again the car will shift gears ok for a short while before the situation starts all over again.
Initially I was told the transmission oil could be overheating so I changed the cooling system and transmision oil - it didnt work. Then I was told the transmission system could be faulty - I changed that too but the problem persists. The car was put on a diagnostics machine multiple times and it did not return any faults. what could be the problem?
Submitted: 1 year ago.
Category: Car
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!

I see your question has been up for an extended time without a response. Do you still need help?

Customer: replied 1 year ago.


Yes I do.

Expert:  sprinkles08 replied 1 year ago.
What exact parts have been replaced?


Customer: replied 1 year ago.

the radiator,


the heat/temperature sensor


entire gearbox/transmission including the torque converter and ATF

Customer: replied 1 year ago.

the radiator,


the heat/temperature sensor


entire gearbox/transmission including the torque converter and ATF


 


NB. When I changed the transmission I used the same old speed sensor. this is the only component I re-used

Expert:  sprinkles08 replied 1 year ago.
Was the replacement transmission remanufactured, used or new?

Customer: replied 1 year ago.

used


 

Expert:  sprinkles08 replied 1 year ago.
Since the transmission was used it's possible that it also has internal problems, whether hydraulic or electrical. If the symptoms are exactly the same as before the trans was replaced though this isn't as likely.

If the problem seems to happen after driving for a while it's definitely possible that the trans could be overeating. Was the cooler flow checked? I would either monitor trans fluid temperature with a scan tool while it's acting up or flush and flow check the cooler to make sure it's not restricted.

If the cooler is ok and the symptoms are exactly the same with the replacement trans then it sounds likely the problem is electrical, either a wiring issue between the trans and transmission control module (TCM) or the TCM itself. The trans is fully electrically controlled by the TCM, the TCM controls all up and downshifting. It's possible that the TCM is failing and causing this, especially if no fault codes are setting in the TCM when this happens. Make sure too that when you are checking for fault codes you are going into the TCM with your scan tool, if you're not entering the TCM when looking for codes then there may be some there that will aid in diagnosis.
Customer: replied 1 year ago.

Thank you for your response.


I will have it re-checked based on the advise you have offered.


Please clarify when you say transmission could be overheating. What should cool the transmission? In my understanding hot ATF is cooled once it goes through the radiator and back into the trans, right? This is the reason I had it replaced with a bigger capacity higher performance New radiator when we suspected overheating.


Whereas I give benefit of doubt with the replacement trans being faulty as the first - I agree with you it is a highly unlikely coincidence - I bought if from a trusted dealer in Dubai. A problem with the TCM appears the most likely culprit - I will have it checked

Expert:  sprinkles08 replied 1 year ago.
Yes, the trans fluid is cooled in the transmission cooler in the radiator. It may also have an external auxiliary cooler. If the radiator has been replaced then you should be able to rule out a cooling issue.

With the radiator replaced and if it's doing the exact same thing as the last trans then I suspect you probably have a TCM issue.
sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 16609
Experience: ASE Master and Advanced level certified. Factory trained with 14 years dealership experience
sprinkles08 and 16 other Car Specialists are ready to help you
Customer: replied 1 year ago.

hello,


 


My mechanic has done further checks and he tells me the problem is with the speed sensor and not the TCM or Transmission. Where is the speed sensor located - is it part of the transmission?

Expert:  sprinkles08 replied 1 year ago.
I'm away from my service information at the moment, I'll get back to you with the location just as quick as I can!

Expert:  sprinkles08 replied 1 year ago.
Do you have a normal automatic transmission or is it a CVT?


Customer: replied 1 year ago.

normal automatic transmission

Expert:  sprinkles08 replied 1 year ago.
My service information does not cover this model and with extensive searching I have been unable to locate a diagram showing the speed sensor locations. Does the mechanic working on it not have service information for the vehicle?

There should be two speed sensors, an input and output speed sensor. They are three wire sensors, black, and they bolt to the outside of the transmission with a single bolt.


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