An SD Premium Class on Fuel System Testing and Trouble Codes P0171, P0174

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This is a ScannerDanner Premium class on fuel system testing based on this case study: Lincoln Navigator Low Power, P0171, P0174 - Fuel Delivery Testing • Lincoln Navigator Low ...
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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29 ноя 2019

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Комментарии : 209

@shanestrains2849 Год назад

11:24 if you would've had your finger just a hair closer, that coolant tee would've cracked!! lol. I'm binging all your videos, you turned me from being scared of electrical to loving the process of diag. Thank you for all that you do!

@ScannerDanner Год назад

Pinning this post. Thank you!

@jermjilla6747 4 года назад

Thank you so much for sharing Mr. Danner. You have taken me from a parts changer to a diag tech. I got more out of three months of your paid vids than guys I know got out of years of tech school. You're an amazing teacher sir. God Bless You

@ScannerDanner 4 года назад

Thank you! Would you mind posting this on the feedback page of my website? That would be awesome. Thank you either way!

@satin227 4 года назад

I'm a simple man I see that I missed a ScannerDanner upload I drop everything and watch it immediately

@e-zauto1148 4 года назад

Just wanted to throw a Big Thank You out to Scanner Danner for every thing you and your family does I've learned so much from your teaching and bought my first lab scope today it's a modis was able to diagnose 100% that a fuel injector was bad would not have been able to do that without your teaching much appreciate what you do and I will be joining your classes on the website I've been in this business for 23 years and I've learned more about electrical in the last year Watching You then I have in the whole time that I've been working on vehicles thanks again appreciate your hard work also I heard on one of your videos that you like to know where everyone is from I am from Arkansas

@ThunderbirdRocket Год назад

That’s the very best instructional lesson on the subject anywhere I’d bet ! Thanks mate !!

@ScannerDanner Год назад

Thank you!

@rplayer9969 4 года назад

I've watched your videos for about 7 years now and I always learn something. You had my truck in your class about 3 yrs. ago after I had taken it to 4 different places one was the Toyota Dealership and no one had any Idea what was causing an intermittent vibration but you did. Thank you for all you do to teach others.

@ScannerDanner 4 года назад

I didn't pinpoint that one for you, I only knew it went away in 4x4 mode, right?

@rplayer9969 4 года назад

It was a bad needle bearing. I had to replace the Clamshell CV axle bushing in the front Differential with a modified bushing from East Coast Gear Supply. It seems Toyota didn't machine the spider gear correctly. You are still the best.

@rplayer9969 4 года назад

I forgot to mention that I bought your book and OTC3633 test light, both are great.

@joshc5658 4 года назад

Love this channel! Thank you for taking your time to make these fantastic videos. It sheds a different light on these systems to save time on diagnostics!

@ScannerDanner 4 года назад

Thank you Josh!

@maxi10ism 4 года назад

thank you scannerdanner for sharing your knowledge. God bless you

@thebaldmechanichardatheari1124 4 года назад

Got your premium channel it's great. Been a tech for 30 years still learning from your channel!!!

@ScannerDanner 4 года назад

Thank you so much! And I can totally related to your user name haha

@robertmedina6875 4 года назад

Hi Paul..Just wanted to take time to say thank you for all of your hard work! You are really appreciated!!!

@nikleigh456 4 года назад

HEY Paul Danner really enjoy watching!!

@shaunsautorepairs5410 4 года назад

quality educational stuff as always....always something to learn even if you've watched it several times before..thanks for sharing

@robertmedina6875 4 года назад

I am a member of the premium channel... SOOOOOO WORTH THE MONEY!! @2YRS NOW!!

@mike-yp1uk Год назад

Of course this would be another fully explained video with lots of good aspects. I like the 20amps showing good electric contact

@ScannerDanner Год назад

Glad it was helpful!

@nicknicu1787 4 года назад

Great info as always! Thank you Paul,you're the best!

@arthurfricchione6614 4 года назад

Paul, excellent informative video. Lots to absorb but well worth it. Thanks for sharing 👍👍👍

@lordvectivus1 4 года назад

Thank you again Mr. Danner sir, for teaching me how to fix cars the right way

@billrimmer5596 4 года назад

Great reminders on fuel pump current draw!

@Pablo_Automotive 4 года назад

Another great weekend with your videos I really apreciate this, Thanks Paul

@PaulysAuto 4 года назад

Paul, you are so good at explaining your diagnostic process and explaining system design's, that you often don't even need a video to compliment your teachings 😂👍! I always have thought that you could have a audio only version and a more seasoned tech could literally just sit and listen to your lectures and understand exactly what you are doing ever step of the way! 12 years later and I still enjoy your content as if I just discovered it! Thanks for making my Saturday morning enjoyable and I hope all is well?

@paulfiebke3909 4 года назад

Ha paul thankyou so much for popping this on my skreen i loved it and learned more watching it, keep up the good work

@kinglangren 4 года назад

As a professional shade tree mechanic I have to say this was a very informative lesson definitely learned a lot. May have to upgrade to your channel.

@ScannerDanner 4 года назад

I have hundreds more just like this one! Thank you for your interest

@d.d4184 4 года назад

You may have to?No matter how good you think you are you need to buy the book and get onto sd premium you won't regret it.

@davidostring803 4 года назад

Thank you for posting this video. I always learn something new. Thank you again.

@SmittySmithsonite 4 года назад

I found myself answering your questions correctly on this one. My brain does actually work after all! 😁 Great stuff, Paul. The more I hear it, the better it sticks. 👍🍻

@thinman8621 4 года назад

Thank you. As always, a great lecture. Much appreciated.

@konyoha 4 года назад

hi from Indonesia...an important explanation about pump pressure ... Thank You

@jamessvetlovics4948 4 года назад

Danner this is my favorite setup, when you post a full diag for us to watch and then go back and analyze it, you should do more of these, seems like you use to make a lot like this for premium channel but seem to have gotten away from it. great video keep em coming

@Joeelectronicschematicsforauto 4 года назад

Great electronics training and hands-on and theory

@W.Khairi 4 года назад

Now......that is what a pro level for sure, Thank you very much.

@xj31 4 года назад

I hope your students realize how lucky they are. Maybe not right now but in the future they will probably realize it. I had a great instructor for electrical at Triton college about 30 years ago. Didn't realize it at the time but as the years went by it sunk in. The instructor was John Thornton.

@ScannerDanner 4 года назад

That is awesome! He is the man Thanks so much

@victorlewis8970 4 года назад

Thanks for this video SD.

@MrCostyaG 4 года назад

Whatching you videos as a show, like Big Bang Theory or smth like that. Just episode by episode with tea and cookie

@kas0016 4 года назад

Loved this case study. Perfect timing. I was the guy on your last video comment section with same p0171. I added the supercharger 5.4 3v and suspected fuel pump. I have around 5v on maf and have fuel sensor on rail. I don't have your snap on scanner but this clarifies alot. My fuel pressure is around 33psi idle no Schrader available. I really suspect the fuel pump now. Truly weight in gold information. You are a pillar in automotive diagnostics. Cheers and Happy Holidays

@ScannerDanner 4 года назад

Careful, I think if you have a psi sensor on the rail, it is normal to see psi around 30ish at idle

@kas0016 4 года назад

@@ScannerDanner going to move it to the forums as you suggested. There shouldn't be any significant drop in rpm rise correct? If anything a rise, right? Its an aftermarket assembly made by airtex. My fuel trims on long term go above 10% with little to no drop in short term. Tuner assumed it was a vacuum leak and overlooked fuel delivery. these stock pumps in theory will support around 400rwhp but still a wearable component and I think it's been pushed beyond its limits

@ScannerDanner 4 года назад

Correct, you absolutely should not be seeing significant drops in pressure on a snap throttle test. Are you?

@kas0016 4 года назад

@@ScannerDanner no drop in snap test. It runs great when its engine cold. Open loop it runs like crap. I hear a exhaust leak when under boost. Then it loses power. Thinking air is getting through upstream unmetered. What do you think Paul? Thanks for responding

@fixitjerry 4 года назад

First!! Just finished another one of your videos and was looking for another! Thanks for the amazing videos !

@mostlymoparih5682 4 года назад

Good stuff Professor. Hope your turkey was good. Happy Motoring.

@saiedabushadi4012 4 года назад

Greatest explanation I have ever seen for this topic Thanks 🙏

@ScannerDanner 4 года назад

Thanks so much! I have hundreds more like this one on my website too.

@adilmchichou5710 4 года назад

Always good job science is the key anybody follow you he is not a part changer

@2secondslater 4 года назад

You are a great teacher, Paul.

@ScannerDanner 4 года назад

Thank you Jake!

@joekuntzman4016 4 года назад

great video! thanks for the tip on using a/c coupling to magnify capture.

@ScannerDanner 4 года назад

Good eye that you recognized that little nugget of information

@IAMNOSLEEP 4 года назад

Great review. Thank you.

@user-io3hw7hx7q 4 года назад

Awesome outstanding job have a great time thanks

@isalmankhan1 4 года назад

You're the Best😎👍 Awesome video

@jamesguirand8243 4 года назад

Great content as usual

@bilalpakstni9704 4 года назад

I'really like and appreciate your videos.keep it up 🤗🤗🤗🤗

@paulfiebke3909 3 года назад

Your luckey my Nissan stoped, i thought a rat eat my wiring, it was ok put a new one in jacked up my bed and it ran good for a moment, had put another one in, my friend said lets see if it works. After hitting the pump in hole yes it did work i still put in the new one. Keep up the good work

@aleskyfinis1025 4 года назад

Great video so far man thank you from Aleskyfinis

@garycampbell8663 4 года назад

That was a good one Danner.

@TheWrench97 4 года назад

Good stuff Paul

@rodx5571 4 года назад

If i may quote George Carlin (in part), your brain droppings are nuggets of gold. Good Vid.

@eduardosaenz9349 4 года назад

Good stuff

@rainbowdiamonds2865 4 года назад

Paul, Dir und Deiner Familie ein gesegnetes Weihnachten, vor allem aber Gesundheit.

@transfixleo 4 года назад

One tip if I might; When looking for a specific event, hit the record button (floppy disc) and it will include a marker line in the data recording. This is helpful for locating a specific event but in this case making sure it is when the pedal hit the floor.

@billyr9840 4 года назад

Nice ! Paul, Hope you and your family had a good Thanksgiving!

@ScannerDanner 4 года назад

Thank you Billy

@abonourabonour1006 4 года назад

My English is not good however you are the only one I can understand I can't explain it

@danman9017 4 года назад

good video tks

@arvydaskraftas6358 4 года назад

Hi Paul. Thanks for the video. Great and full of good stuf as always. I want to discus with you about feul pump current. In this video you say, that cloged fuel filter would cause more apmerage on pump. I think on this fuel delivery design it is not true. Because fuel pressure regulator is in fuel tank, it doesnt mater for the fuel pump how big is restriction after that regulator (fuel pressure after regulator never gets biger than it is set to). So if fuel filter is in line it can be completely cloged and fuel pump amperage and rpm should be the same as if filter is new. Corect me if I am wrong. Thanks again for your sharing of knowledge.

@mnrujiska771 4 года назад

I am also thinking that on this design, clogged fuel filter will not change amperage much. because fuel pressure regulator is in tank, but i don't know for sure how big is bypass hose trou regulator and how it affects amperage.

@ScannerDanner 4 года назад

I think you are right my friend! Never thought about it much. To be honest, it is really difficult to ID a restricted fuel filter no matter what test you do. Short of t-ing in a gauge before and after the filter and at which point it would be easier to just change the damn thing. Right? But I agree, high amerage on a pump from a plugged filter would only apply to electronic returnless systems and return type systems. NOT mechanical returnless systems like this vehicle has.

@arvydaskraftas6358 4 года назад

I think you are right about changing fuel filter. I think that way: if its clogged filter, nice. You changed it and got it right. But if it was bad fuel pump, after changing it you will change fuel filter anyway. So customer doesnt lose money on both cases.

@richardcranium5839 4 года назад

@@arvydaskraftas6358 heres something to think about- a restricted filter causes pressure build up in the pump plus lower fuel transfer rates causing thermal stress on the pump. a new filter fixes that but has the damage to the pump in the mean time caused irreparable harm? my experience says yes . usually if a filter gets to that point the pump wont be far behind.

@richardcranium5839 4 года назад

@@ScannerDanner a fuel flow volume test will show it sometimes. theoretically speaking yes you would have to test before and after the filter and by that time you are correct ya might as well change it. working with different hydraulic systems over the years(yes a car fuel system is a hydraulic one) often times taps are installed to be able to diffentially pressure or flow test a part or a subsystem. i've found bent twisted and other various restrictions in inaccessable places by using such methods so an open mind that there are alternatives may one day get someone out of a bind. mind exercises like that help get the whole picture in better focus too.

@amr-50 4 года назад

I am a member of the premium channel but i couldn't find this video when i searched .. thanks danner

@ScannerDanner 4 года назад

I don't think it is there! I looked everywhere for it. Like I said, it got lost in my vault and was never released until now

@amr-50 4 года назад

@@ScannerDanner thanks danner

@amr-50 4 года назад

@@ScannerDanner can you make us a video here or on the premium showing how to measure or test fuel pressure on direct injection cars , usually these cars have high pressure pump which will exceed the gauge reading so how we verify the fuel deilvery on that type .. thanks once again

@ScannerDanner 4 года назад

I have a few GDI case studies. Also chapters 16 and 17 playlist. I have a no start GDI case study on a GM and a 3 part series on an Audi Just use the Premium search and type in GDI

@amr-50 4 года назад

@@ScannerDanner thanks danners

@joseluiszapote2634 4 года назад

Thanks x share

@zzzzzzz1178 4 года назад

شكرا جزيلا لك استاذ وتحيه خالصه من العراق بلد الرافدين

@ScannerDanner 4 года назад

اهلا وسهلا بكم يا اخي

@allendib4855 4 года назад

@@ScannerDanner hahahaha... paul in an arabic version. That would be nice to see

@ScannerDanner 4 года назад

I used google translate for this one. But I do have a friend translating my book in Arabic as we speak

@zzzzzzz1178 4 года назад

Professor, you speak English and I translate all the lecture, but my comment to you in Arabic

@zzzzzzz1178 4 года назад

I learned a lot from you professor and you have my appreciation and respect

@jordanhawkins9129 2 года назад

So I need help on my no start fuel issue on a 2011 f250 ,6.2 replaced pump n driver fuel module and fixed the problem ran good for 3 weeks n stalled our n won't start again I have no relays or fuses bad but when I jump and bypass the fuel module it will run is it possible I got a lemon part n I need to replace it again or can it b something else down the line

@mariogiron6120 4 года назад

Hi, anybody have any advice on bluedriver vs something like HF Zurich/Autel. Trying to look for something more than just my $15 obd2 wifi reader. thanks

@gladmarchatlein8164 4 года назад

Hi sir ScannerDanner..can you explain the different on the scaling of your gauge aprox. 4.5 BAR in comparison with your scope illustration of aprox.10 BAR is this the effect of the LEAK you mention at the end of the video presentation?..... thanks in advance for answering my question! ..Blessings sir!

@ScannerDanner 4 года назад

Class is in session :-) www.scannerdanner.com/join-scannerdanner-premium.html

@shawnhardy52 2 года назад

Danner i need your direction on a problem. 2007 haundai santafe, v6. fuel trims on both banks at aprox 30%. im thinking MAF OR FUEL PUMP. Where i got stuck at is when the rpms are raised fuel trims improve, i thought a bad MAF or FEUL PUMP would cause fuel trims to go MORE positive as rpms increase?

@JD-526 4 года назад

I did a simaler test because my fuel pump would intermittently stop working then not work at all. So I had it towed to a, get this a mechanic shop and told the mechanic what had happen. He went out to the truck and he got the truck to start. Then he called me and asked why I though it was the fuel pump. Saying the truck started. I explained again the procedures I did with my verus. He said it Dosent mean your fuel pump is bad, WOW a mechanic...not. I said hook up your scanner to it and check for yourself. He said all he had was a code reader. I have learned all I know from scanner Danner's channel, GET SCANNER DANNER PREMIUM. This will help you know and understand everything with you vehical.

@viplegaleducation1292 4 года назад

I’m about to invest in myself and take a leap! Want to buy a scan tool and join your premium channel and get book. What model scan tool would you recommend. Priority is coverage, repair help, and longevity. 🙏

@henryrobinson9837 4 года назад

good video. the scope pattern on old pump had 2 spikes higher than other 6,is that normal or just focus on total dropouts of segments

@ScannerDanner 4 года назад

Yes, it is uncommon to see every segment of an electric motor drawing the exact same current

@caliautotech21 4 года назад

Learned something from another channel as well.. if you take fuel pressure spec and multiply it by .12 to .13 you can get an approximate amperage spec to compare .. thought I’d share that and also see your thoughts on that @scannerdanner

@ScannerDanner 4 года назад

wonder how accurate that is? testing it on multiple cars would be the answer to that

@caliautotech21 4 года назад

Yea I plan on doing several known goods since I’ve learned it.. thought it would be a nice addition to the test if it turns out to be truw

@mickyt87 4 года назад

Could a bad fuel pressure regulator be at fault for low fuel pressure? Or is there no way testing it, or changing it separately from the pump assembly on a returnless system? Thanks love the videos!!

@ScannerDanner 4 года назад

If it's part of the pump assembly, there is no test for it. And no way to know for sure if it's leaking in there.

@jbaerial537 4 года назад

Hey Paul. Great video like always. I was wondering about something while watching this video. These newer design brushless motors. Can you read them the same using a current test to see a bad spot in the armature ? I haven’t ran across one yet to check but am curious if it is the same type of reading. Not just on a fuel pump motor but any motor that is a brushless design. Thanks man

@ScannerDanner 4 года назад

I've not seen a brushless motor yet, so I cannot answer that

@enda320 4 года назад

Just a minor point, the sections of a commutator are called rotor arms, which might be better term as if you say an 8 bar fuel pump, my first thought is 8 bar of pressure. When you first counted the current peaks and said it was an 8 bar pump, It got a little confusing.

@rob21v26 4 года назад

Is autozone a good place to buy sensor bec I bought a crankshaft sensor from them n I put it in it died on me going work I took it back and got it replaced but now it misfiring and hesitant to start it a 99 dodge ram 5.2l

@ScannerDanner 4 года назад

You didn't adjust it properly. Air gap is critical

@stiefbeen22 4 года назад

Thanks for the great video Mr. Danner. The scope image on 28 min, should that not be 1/2 a rotation? The identical winding and it's current appears 180 degrees later again I would say.

@ScannerDanner 4 года назад

half the rotation would have been 4 "humps", this was an 8 bar pump

@stiefbeen22 4 года назад

@@ScannerDanner Hoping to only add to your already vast knowledge Sir, please look at 8.12 min for another minute or so to see what I mean: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OpL0joqJmqY.html

@meesau2112 4 года назад

know this is off topic but want to hear your thoughts. Have a code po449 had defective vent solenoid repl. Now the light comes on roughly once a month all connections look good any thoughts on what to look for? Big fan of the channel!!.

@ScannerDanner 4 года назад

Pull on the wiring right at the vent solenoid connector. I bet it pulls apart (copper wires are all broken inside of the insulation)

@mickguirk 4 года назад

How do you do this test on a speed density system? I'm an FCA tech for the most part unless it's a PZEV we don't use MAF sensors. So I'm just wondering how to do the WOT test on vehicles without MAF. Sorry if it's a dumb question but I'm trying to better understand fuel trim issues. Engine driveability problems are my biggest weak point I'm trying to improve.

@ScannerDanner 4 года назад

It is no different on a speed density system, you can still use your oxygen sensors as a guide to low power conditions at wide open throttle. If they stay full rich (over 800mv for a narrowband O2) then you DO NOT have a fuel delivery problem. Hope that makes sense.

@murungiwilber90 Год назад

Hello Mr..SD I would like to ask can you use Fuel spray instead of starting fluid..Am in Uganda we don't have advanced Auto shops .. Thanks

@ScannerDanner Год назад

I don't use starting fluid for diagnostic work as it is too volatile. Carb cleaner is my preferred spray when doing a quick test for no fuel

@truth4reel 4 года назад

GTDI means Gasoline Turbocharged Direct Injection, those fuel systems have a variable speed electronic returnless fuel system. The 3.5L Ti-VCT (Twin Independant Variable Cam Timing) fuel systems have a dual speed MRFS. There is a FPCM or FPDM as some like to call it, but no fuel pressure sensor on the rail.The FPCM controls the fuel pump pressure at 10 or 12 V based on load. Basically the PCM duty cycles the FPCM to control the fuel pump. How i know this? I had an insane case study on 2014 Taurus with the 3.5 NA engine.

@uncommoncents9884 4 года назад

Great I got a question. I have seen on several occasions the use of the fuel pump waveform to calculate rpm of the pump. My question has to do with the comutator bars. When u have a low current spot in ur waveform wouldn't the current flow be low again at 180° meaning the pump has 16 bars?

@ScannerDanner 4 года назад

reverse polarity on that same commutator every 180, so it is not the same pattern

@uncommoncents9884 4 года назад

Great video but I'm still confused. My question is if a single commutator bar is damaged and doesnt allow current flow wouldnt u would see a drop in current flow when it passes both brushes? If so wouldn't 1 rotation of the shaft of the motor be every other dropout?

@ScannerDanner 4 года назад

In theory that is correct, however I have a case study showing a complete drop out only 1 time per revolution which means when the polarity is reversed it can support current flow, so I suppose it would be a brush to commutator contact issue in that case, not an open winding. An open winding would be as you described

@uncommoncents9884 4 года назад

Cool that makes more sense thank u for the response

@hap3895 4 года назад

I’ve been trying to sign up this is such great information I’ve been trying to sign up for two months is there anyway I can just add a credit card instead of going through PayPal or is there a number I can call to give you my information

@ScannerDanner 4 года назад

Hector, email me at support@scannerdanner.com PayPal handles the recurring subscription payments for me but if you wanted to pay for 6 months or a year upfront we can do that with a regular card outside of PayPal. It will be a PayPal invoice but you won't need to have a PayPal account to pay it. Copy and paste this exchange when you email me

@eastmanautorepair5130 4 года назад

Sir I am big follower of you I am having trouble with s350 2004 I change ESM electronic shift module used part since car not started and getting code b1016 Please help me how to program this used shift module

@ScannerDanner 4 года назад

Post this to my forum. It is free to join and we have an awesome community that is friendly and willing to help. www.scannerdanner.com/forum/post-your-repair-questions-here.html Hope to see you there!

@ducare7218 4 года назад

GTDI is gasoline turbocharged direct injection aka as ecoboost which use a hi-pressure fuel pump to convert low psi to high psi for direct injection

@ScannerDanner 4 года назад

Thanks for the lesson :-) not sure where you were going with that though

@randalldalton5475 4 года назад

Do you plan on writing a new edition with updated information and examples?

@ScannerDanner 4 года назад

All of my new material is in video form on my Premium channel. Someday I'll write another book but not anytime soon. Thanks!

@wagoosh78 4 года назад

low feul pressure, low amp draw , high RPM, faulty pressure regulator at pump? leaking through ?

@ScannerDanner 4 года назад

Possible? No way to know if it was that or the impeller of the pump that was worn. On these systems where the regulator is part of the pump assembly, there is no test to determine if it was the regulator or pump or leak in between. Also, this is why, on this design, you MUST change the entire assembly

@jesusortiz3079 4 года назад

This is exactly what I was thinking about the regulator, thanks for replying to this comment Paul and clarifying on that!!!

@erikwright197 Год назад

How would you go about finding a bad injector?

@retiredperson4054 4 года назад

I have a 2010 Altima 2.5S w/Automatic. My OBII device shows codes P0725 and P0826 together. The cars is running fine. I have not cleared the codes (but will tomorrow). The car seems to run fine, no hard start, no stalls nor stutters or shifting issues. I am thinking the Cam-Shaft Position sensor may be one of the OE styles that gets oil contaminated and perhaps it is sending bad info to the power-train? Since P0826 is a Power-train code? Any thoughts?

@ScannerDanner 4 года назад

I need you to do the homework for me. What are the definitions of those codes? I know they are transmission related but that's it.

@retiredperson4054 4 года назад

@@ScannerDanner Dan, I cleared the codes and they did NOT come back, and there is NO Check Engine Light on either. Code PO725 "Engine Speed Sensor Circuit Malfunction", and code PO826 is defined as “Up and Down Switch Input Circuit” on vehicles with manually shift-able automatic transmissions. I think the up/down shift code came up because at least a couple of times I have inadvertently moved the shift lever over into the slot for "manual shift mode" when going from Park down to Drive, and then having done it unintentionally I quickly moved it back to the right back into the normal "Drive" shift position. The Engine Speed Sensor is most likely a code connected to either the Cam Shaft Position Sensor, the Crankshaft Position Sensor (aka Transmission Speed Sensor -- As I find it is called out to be the same part by different links). Again this is a 2010 Nissan Altima 2.5L with 103K miles. No other issues. So I think I am good here - Thanks for answering and asking! Richard in KY

@ScannerDanner 4 года назад

@@retiredperson4054 My name is Paul Danner :-) So I looked up the P0725 code and this is a generic code indicating the TCM did not receive an engine RPM signal via the CAN network. You should ABSOLUTELY have an engine code too with this TCM code P0725. IF you do not, this does not bode very well for your transmission control module (TCM). As far as the P0826 code goes, I do NOT think you can cause that code by what you are describing. In other words, operator error, is not an option here. It is very difficult to advise you further on these and almost impossible when the problem is intermittent. Then add that we are talking through text on the screen, makes it even worse. If you find that you need help in the future, post to my forum www.scannerdanner.com It is free to join and I have 4 paid moderators who help me help you guys. Thanks! Hope to see you there.

@retiredperson4054 4 года назад

@@ScannerDanner Paul, Thanks for the fast reply. Like I posted - I only had the two codes showing. They went away (cleared both out ) with my Bafx Products - Wireless Bluetooth OBD2 / OBDII Diagnostic Car Scanner & Reader Tool for Android Devices. At this point, I will just have to keep checking every week or so to see if anything shows up? I will hop onto your forum - and thanks for the offer and your prompt replies! I was a building trades instructor at two Technical Community Colleges -- Thanks for teaching the auto skills trade! Best regards, Richard P

@billwilliams6338 4 года назад

SCANNERDANNER can you make a "cheat sheet" rows and columns of what the short & long Trims, RPMS would be for a lean condition compared to a RICH condition if you're having a vacuum leak compared to having a fuel pressure issue. It gets very confusing to know what the trims should be at because you have experience when looking at the trims to know if you have a vacuum leak or its a fuel pressure problem but how can you know but just looking at the trims? You can get a lean condition or a Rich condition from a vacuum leak or a fuel pressure issue so how can you tell by just look at the trims?

@ScannerDanner 4 года назад

Watch this video ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oRX2V6_a3dc.html

@shridhar0yt0 4 года назад

I have a doubt the filter is after the pressure relief valve so wouldn't be the pressure going to be same if it has the blocked filter or new filter hence the amps are going to be same just my logic

@ScannerDanner 4 года назад

depends on the design, not all of the systems used a pressure relief valve in the tank, in fact most of them do not

@roberthogue6797 4 года назад

With this type of pump/regulator combo, isn’t it possible the both the pump and regulator were still good and you just had the pressure drop simply by a plugged filter? You’d still keep the proper pressure before the plugged filter and have the lower pressure/volume after it.

@ScannerDanner 4 года назад

I believe I addressed the fuel filter variable in my video? What was the old pump vs new pump, with RPM and Amperage? Refresh my memory. I believe there in lies your answer. Was it lower than normal amperage and higher than normal RPM? Sorry, this lecture was 2 years old and my son Caleb did the edits, so my memory if foggy on this one.

@roberthogue6797 4 года назад

In this case, there was definitely an issue with the mechanicals of the pump. There was an increase in amp and a decrease in rpm with the new pump. Apparently I phrased the question wrong, I was trying to ask if the same symptoms could also be caused simply by a plugged fuel filter? High long term fuel trims/high load %/dropping fuel pressure with increased rpm...

@shanefickett3597 4 года назад

ScannerDanner! I have an issue and can’t figure out what the issue is. I have a misfire cylinder 2. I have a new distributor and new cap and rotor, new plugs and new plug wires, new fuel filter and injectors were just cleaned, O2 sensors are fine and EGR is fine. I found out that I’m not getting spark out of my plug cable on cylinder 2. I changed wires around and still nothing so the dist is not giving spark for cylinder 2. Can you help me out?!?! I’m going insane trying to figure out what the issue is.

@shanefickett3597 4 года назад

My car is a 1996 Honda Civic DX 1.6 non vtech.

@ScannerDanner 4 года назад

Same problem with the old cap? Other than a bad cap and rotor. It sounds like you have an input issue. Is this the correct distributor? Any damage to the trigger wheel or reflector on the shaft of the distributor?

@shanefickett3597 4 года назад

ScannerDanner tried the old cap, and had same issue. Shaft on new dist is fine. I’m checking crank sensor and teeth that pass it.

@shanefickett3597 4 года назад

Any other ideas scannerdanner? I’m thinking it’s either going to be the crank sensor or the wire for it, or the ECU but doubt it’s the computer because they rarely go out on these cars. And most likely wouldn’t be the main relay right? Not the PGM-FI?

@ScannerDanner 4 года назад

@@shanefickett3597 "new distributor"?? Why was the distributor changed? If you are consistently losing spark to only the #2 cylinder, you absolutely have an input problem. Your ECM is receiving garbage in and is providing garbage out. There is no other explanation for what you have going on.

@user-pt5nx1np5t 2 дня назад

Hi Mr Paul, I'm one of your followers from Oman. I've 2009 GMC terrain I'm having a lean condition on both banks. The nice thing is that the code P2179 says "system too lean off idle" which helps a lot. I used a multimeter as a jumper on the fuel pump relay, the pump runs and I got around 4.6 Amps. Is it weak fuel pump or normal ? Thanks,,

@ScannerDanner День назад

Need a pressure reading. Amperage alone is not enough data

@keithdefazio9613 4 года назад

Can you make a visual representation of the difference a good psi with low volume and good volume ?

@ScannerDanner 4 года назад

All you need to do to test volume is to look at your fuel pressure during a WOT snap of the throttle. Another good test is to look at your oxygen sensors during WOT on a test drive. I never directly measure fuel volume. Not once have I done that in a diagnostic process.

@fascistpedant758 4 года назад

On a system with a return line you can reroute the return to a container to measure flow rate.

@ScannerDanner 4 года назад

@anti chuckle You can fo sure my friend, it's just not necessary to ID a volume issue

@fascistpedant758 4 года назад

@@ScannerDanner Ofcourse a "good PSI - low volume" condition doesn't really exist in a normal diagnostic situation, but flow rate is a useful indicator of the condition of the pump. It's nice to know your pump still has a little surplus capacity.

@kafilmohammad2704 4 года назад

Diesel rail pressure psi for injector

@ScannerDanner 4 года назад

No different than any other psi sensor

@brandonhollingsworth306 4 года назад

I could use your help on this 3.6 🤣

@ScannerDanner 4 года назад

We can help youPost this to my forum. It is free to join and we have an awesome community that is friendly and willing to help. www.scannerdanner.com/forum/post-your-repair-questions-here.html Hope to see you there!

@robertdunn7717 4 года назад

Had similar on a 3.6 with direct injection injectors clogged

@sargetester99 4 года назад

Diesel engine diagnosing

@kafilmohammad2704 4 года назад

How to test imoblizer ic chips coding

@oSTYNCLSYo 4 года назад

Do you have a video on p0172 p0175?

@ScannerDanner 4 года назад

I have a few. MAF issues, ruptured psi regulator diaphragm, head gasket issue (contaminated O2s) are the common causes. Also, leaking injectors, fuel contaminated oil, timing issues can cause this

@oSTYNCLSYo 4 года назад

@@ScannerDanner what about a temperature sensor?

@bartscave 4 года назад

I’m a little confused using amperage to prove out good voltage at the pump. If you have a marginal voltage drop, wouldn’t you still have a high amp draw? Maybe next time you have one with a marginal voltage drop record an amp scope pattern to show the difference. Thanks

@TheMagican614 4 года назад

If you have voltage drop where you shouldn’t (high resistance) then you would have lower amperage. Using ohms law, you find that the more resistance you add in series to a circuit, you will have a lower amp reading.

@bartscave 4 года назад

TheMagican614 , yes but he said amperage was a little low because it had a mechanical failure. So how are we sure it’s not a little low due to a voltage drop instead?

@TheMagican614 4 года назад

Bart Young well in the video when he saw he had around 6 amps he was not concerned at that point with a power or ground problem. Scannerdanner has a lot of experience so he has an idea of what kind of reading he should see. I personal think that if there was a problem with high resistance in the circuit, you would see less current than 6 amps.

@kafilmohammad2704 4 года назад

Abs pressure sensor design detected how can learn even though please help us

@ScannerDanner 4 года назад

Sign up for my Premium classes from my website and watch my chapter 7 and 8 playlists. You can watch some case studies here on RU-vid under the same chapter playlists here on my channel