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 Mike Your Own Question

Mike
Mike, UK Car Mechanic
Category: UK Car
Satisfied Customers: 38666
Experience:  Hi, I am a Car/ vehicle technician of 34 years. 29of -running my own repair/diagnostic business.
Type Your UK Car Question Here...
Mike is online now
A new question is answered every 9 seconds

Hi.I have a .Toyota Hi Ace 2002 model year,with a D4D engine.Have

Resolved Question:

Hi. I have a .Toyota Hi Ace 2002 model year,with a D4D engine.Have got a diagnostic code,P0190.Was advised to change the fuel rail with sensors. Have done that,but the problem is still there. Think the problem must be in the electric circuit. Can you please advice me. Best regards XXXXX XXXXX Norway.
Submitted: 1 year ago.
Category: UK Car
Expert:  Walt-mod replied 1 year ago.
Hi,

I'm a moderator for this topic. I've been working hard to find a Professional to assist you right away, but sometimes finding the right professional can take a little longer than expected.

I wonder whether you're ok with continuing to wait for an answer. If you are, please let me know and I will continue my search. If not, feel free to let me know and I will cancel this question for you.

Thank you!
Customer: replied 1 year ago.

Hi.


I have checked the Connectors on the fuel pump and on the fuel rail.


Then the DTC code P0190 went away,but a New came up-P0100.Which tells the airmetering Device near the air filter dont work properly.It was locked on one figure-not working.(but the engine started)


As a last trial I disconnected the Connector on the fuel pump-the one nearest to the engine Block.Then the engine started working properly,and the DTC`s was good-0 errors!


Dont know how long it will work-will try to go for a test drive tomorrow.


Will let you know how it works out.


Best regards XXXXX XXXXX Øvretveit

Expert:  Walt-mod replied 1 year ago.
Thank you for your continued patience. We will continue the search for a professional for you.
Expert:  Mike replied 1 year ago.
Hello and Welcome to justanswer..

My name isXXXXX have been asked to help you with this issue.

The fault code you had - the P0190 - the Toyota definition for that fault code - and what needs to be done is as follows:

Fault code - P0190 Toyota D4D.

The Fuel Rail Pressure (FRP) sensor is a diaphragm strain gauge device in which resistance changes with pressure.

The electrical resistance of a strain gauge increases as pressure increases, and the resistance decreases as the pressure decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signal to the Powertrain Control Module (PCM - or Ecu ) corresponding to pressure.

Strain gauge type sensors are consider passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.

Voltage that is dropped across a fixed resistor in series with the sensor resistor determines the voltage signal at the PCM / Ecu.

This voltage signal is equal to the reference voltage less the voltage drop across the fixed resistor.

The FRP sensor measures the pressure of the fuel near the fuel injectors. This signal is used by the PCM to adjust the fuel injector pulse width and meter fuel to each combustion cylinder.

Symptoms with the fault code P0190:

- Engine Light ON (or Service Engine Soon Warning Light) - Engine will not start

Causes


- High fuel pressure - Low fuel pressure - Damaged FRP sensor - Excessive resistance in the circuit - Low or no fuel - Wiring harness connector of the fuel pressure sensor - Fuel Rail Pressure Sensor - Fuel..

So the above need to be checked with regard to that fault / code on this model.

As for the P0100 code - P0100 Mass or Volume Air Flow Circuit Malfunction... This is the air flow meter / circuit as you mention.

This when faulty - or its circuit , can and will also cause non start symptoms - but please note, thats its correct function can be governed by loose fittings / air piping - split / perished piping - bad / faulty;loose connections to the meter etc - so all this needs to be checked before condemning the meter itself.

Too - the meter sensor inside the grills may be dirty - you can use a spray cleaner for this through the grills - but you should never strip the meter / touch the sensor as this will usually damage it.

Also - carefully check the air filter system is not in need of renewal / cleaning first...

Working through as above should help you get this issue sorted for you ..

Please bear in mind too that if all checks out as ok then the fuel system - filter and pump -pressures etc inc injectors would then need to be checked / investigated with suitable test equipment - best usually at a diesel specialist for that if it should come to that.

Let me know if you need anything more on this at all -

Meantime -- Please click on the OK rating to Excellent ratings service for me now, Thank you for that... and you can get back to me anytime if you need / wish..

Best Rgds, MIKE.


Please note, you are rating the content of my "answer" - my help to you - not the "system" which can experience delays etc which are not under my personal control -or delays caused by "time -off" which we all have on occasion - Thank you.



Mike, UK Car Mechanic
Category: UK Car
Satisfied Customers: 38666
Experience: Hi, I am a Car/ vehicle technician of 34 years. 29of -running my own repair/diagnostic business.
Mike and other UK 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:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
< Last | Next >
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Shop Owner

    Satisfied Customers:

    1040
    17 years Shop Owner /Technician. 27 years experience,
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    UK Car Mechanic

    Satisfied Customers:

    472
    12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4034
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/NA/nabilc/2011-1-24_205715_jap500.64x64.jpg Billy's Avatar

    Billy

    Trainer/Master tech.

    Satisfied Customers:

    1276
    Trainer - master tech., SAE member
  • http://ww2.justanswer.com/uploads/witt0018/2009-02-09_180738_trev2.jpg Trevor Witting's Avatar

    Trevor Witting

    UK Car Mechanic

    Satisfied Customers:

    815
    NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    UK Car Mechanic

    Satisfied Customers:

    811
    city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan