UK Car

UK car repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

I have a 2008 L200 which throws a P1272 Code as soon as I…

Customer Question
Hi PearlI have a...

Hi PearlI have a 2008 L200 which throws a P1272 Code as soon as I crank it.I have tested the Fuel Pressure sensor with an Oscilloscope and a Delphi Diesel High Pressure Test Kit. Indeed it reads Fuel Pressure accurately.I have Load Tested the wiring from ECU to Suction Control Valve and Fuel Rail Pressure Sensor, the pins and female connectors are all clean and tight.I can clearly see that upon Cranking (Graphed Live Data) that Fuel Pressure Rises to 1650 - 1800 bar which I believe is excessive and sets the fault code.My thinking is that the SCV is not controlling the Fuel Pressure, I have replaced the SCV twice with no improvement.I am able to drive the SCV with my scan tool actuator function (Bosch KTS - Delphi DS150e and Snap on Verus)

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with a Mitsubishi. The Mitsubishi Mechanic I'm going to connect you with knows all the tricks and shortcuts. Are you hoping to fix this yourself?

Further more

Mechanic's Assistant: Is there anything else the Mitsubishi Mechanic should be aware of about your Mitsubishi?

The SCV is driven by the ECU by a PWM / Duty Cycle With a NEgative on one Wire and a PWM Switched Positive on the Other.

Submitted: 2 years ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Customer reply replied 2 years ago
The SCV is driven by the ECU by a PWM / Duty Cycle With a NEgative on one Wire and a PWM Switched Positive on the Other.
I am able to control Fuel pressure manually using a PWM Generator connected to the SCV (Of Course I have isolated it from ECU) and I can control, raise and lower Fuel pressure as I wish. This tells me that the SCV fuel pumpare good, The Rail Pressure sensor I have already confirmed as good.I read from the 4D56 Manual that the Rail Pressure Limiter Valve will "Pop Off" at 2000bar and will then not close until the pressure drops down to 500bar.As I crank this engine I can see that Fuel Pressure rises to circa 1700 bar very Quickly (Im assuming that is setting the P1272 fault code) then when I rev the engine, FP (fuel pressure) rises to 2000bar, the valve pops off and pressure drops to 650 bar and sits there - The Valve has popped off at 2000 bar and then because it never drops below 500 bar (where the relief valve is designed to close again) the Rail pressure is now running uncontrolled.I am aware that the New SCV should be adapted to the ECU by Computer however I cannot get this Bitch (sorry) to start and idle without setting a fault , with the fault code set I cannot perform the "Learn" procedure for the new SCV.Be assured that the SCV is correctly fitted with the Gasket and O ring in Place.
Customer reply replied 2 years ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 3 days by:
2/8/2016
UK Auto Mechanic: Peter Zavarelli,
 replied 2 years ago
Peter Zavarelli
Category: UK Car
Satisfied Customers: 32,585
Experience: Technical Consultant at Just Answer
Verified

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

It is possible that this is an issue due to a fault in the engine control module sending incorrect signals to monitor and control the fuel system.I have seen some of these fail before in the past needing replaced for faults like this here.I would have this checked into/tested further to see if this is the cause here and if found to be an issue it will need replaced for this fault.

If this was already checked or replaced let me know so we can continue.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own UK Car Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an uk auto mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Peter Zavarelli Your Own Question
Peter Zavarelli
Peter Zavarelli
Peter Zavarelli
Category: UK Car
Satisfied Customers: 32,585
32,585 Satisfied Customers
Experience: Technical Consultant at Just Answer

Peter Zavarelli 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:

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!!!!

AlexLos 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.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, 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.

EstherWoodstock, 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.

RobinElkton, 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.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Marty

Marty

European Car Expert

432 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

Greg

Greg

Shop Owner

1,360 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

626 satisfied customers

12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified

Matt

Matt

Mechanical Engineer

4,702 satisfied customers

BEng hons Mech engineering, in auto industry 22 years

Trevor

Trevor

UK Car Mechanic

853 satisfied customers

NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician

Rob

Rob

UK Car Mechanic

823 satisfied customers

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

martin jones

martin jones

UK Car Mechanic

646 satisfied customers

25 years as a mechanic and mot tester, owned own business for 10 years city and guilds trained

< Previous | Next >

Related UK Car Questions
It will crank for two seconds and automatically dies.
It will crank for two seconds and automatically dies. Ingnition switch just replaced … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,308 satisfied customers
I'm searching for an installion guide for a cable in the
i'm searching for an installion guide for a cable in the fuel tank? part: 30773851 … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,308 satisfied customers
I wanted to discuss an issue with my car. Vauxhall Insignia
Vauxhall Insignia 1.8 Petrol 2013 Model, manual transmission … read more
Kevin
Kevin
workshop foreman /master tech/mot tester
1 satisfied customers
İ have a Peugeot 508, year model 2014, driven only 11,000
İ have a Peugeot 508, year model 2014, driven only 11,000 miles, excellent maintenance. İ left it undriven for two months, only turned it on for fifteen minutes every 10 days or so. Now it makes a sma… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,702 satisfied customers
My 2006 V6 TD Treg wont unlock the steering wheel and wont
Hi, My 2006 V6 TD Treg wont unlock the steering wheel and wont start. Just a warning of STEERING COLUMN WORKSHOP shows on the screen. … read more
Wolfgang
Wolfgang
8 satisfied customers
I have 2004 x5 3.0d which misfire's under acceleration ...
Hi, i have 2004 x5 3.0d which misfire's under acceleration ... it's been plugged in and show's no error's, we thought it may be an injector ? But another Guy has told us it's to do with a sensor and t… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,702 satisfied customers
2015 diesel note has service spanner light flashing when
2015 diesel note has service spanner light flashing when ignition is switched on. Shows '0' miles before service. Cannot reset service light or interval by pressing the right hand stick or pressing co… read more
Michael Partington
Michael Partington
Auto Electrician
High School or GED
603 satisfied customers
How to change light bulb behind the speedo meter. The light
The light bulb behind the speedo meter in chevrolet spark … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
92 satisfied customers
I have code p0028. I have check the oil level and the filter
I have code p0028. I have check the oil level and the filter as well. They're all good. I swapped the ops but nothing has changed… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,360 satisfied customers
My 2006 BMW X5 air conditioner is not functioning properly.
My 2006 BMW X5 air conditioner is not functioning properly. It blows cold air in the rear but nothing comes out from the vents in the front. … read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,702 satisfied customers
Looking to get radio security code after battery replaced in
Looking to get radio security code after battery replaced in Ford SMax. The unit is the 7inch touchscreen version with Sat Nav updated by CD… read more
Michael Partington
Michael Partington
Auto Electrician
High School or GED
603 satisfied customers
My immobiliser will not go off when I put the key in the
My immobiliser will not go off when I put the key in the ingnation on my KA it's a 03 … read more
Michael Partington
Michael Partington
Auto Electrician
High School or GED
603 satisfied customers
I need a radio unlock code for an HU605?
Hi, I need a radio unlock code for an HU605? JA: Okay, I'll connect you to the mechanic to go over that information regarding your Volvo. Before I do, is there anything else you want him to know? Cust… read more
enesd
enesd
Volvo Expert Mechanic
Vocational, Technical or Trade Scho
17 satisfied customers
I've got a Chev Aveo with no injector pulse. There is spark
Second opinion] Hi, I've got a Chev Aveo with no injector pulse. There is spark and the injectors have 12V supply, but no earth pulse. CAM and CRANK sensors both pulse and timing seems to be fine.… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,360 satisfied customers
This is a fab website. So my other half has bought a Y plate
Hey! This is a fab website. So my other half has bought a Y plate Volvo C70. It's come up with an imobiliser connection issue. It's been standing for 6 years, when it parked up there was nothing wrong… read more
enesd
enesd
Volvo Expert Mechanic
Vocational, Technical or Trade Scho
17 satisfied customers
Chevrolet Aveo 2012 only cranking and not starting. I need
Hi, Chevrolet Aveo 2012 only cranking and not starting. I need advice. … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
5,308 satisfied customers
My 2003 Jaguar XK8 goes to limp mode and appears to be stuck
My 2003 Jaguar XK8 goes to limp mode and appears to be stuck in one gear and hard to accelerate and illuminates Gearbox Fault, DSC Fault & Cruise Control Unavailable … read more
Richard
Richard
UK Car Mechanic
Vocational, Technical or Trade Scho
626 satisfied customers
I have a B200 turbo automatic with 143,000 km. The front
Hello, I have a B200 turbo automatic with 143,000 km. The front suspension seems too low because I scrape my chassis on relatively low road bumps. Searching the internet I came across a "code 484 chas… read more
Kevin
Kevin
workshop foreman /master tech/mot tester
1 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