Toyota Fuel Trims and live data diagnosis tips!

[@geriscape]

The live demonstration, in particular, accompanied by interpretive commentary, is invaluable. Thanks for taking the time, and for communicating clearly.

[@vando1267]

That dog analogy is spot on and is such a great way to explain STFT and LTFT. Well done!

[@cj1608]

Yes, gives you an image instead of a mystery.

[@cdmsvt]

If only everyone was a teacher at heart like you are sir, this world would be a better place.

[@Coyote5555]

I have always wanted to see someone explain these values in "real time" etc. Great explanation, and I don't even own a Toyota

[@Tacosauce22]

AMD is a great Human being for us all. God bless this man and his family and all the success they deserve 🙏🏼

[@letzrockitrite8469]

I'm a musician and like automotive diagnostics, how things work can, and typically do, get far more complicated than they needs to be . Thanks for "dumbing it down".... it really helps me to understand the premise you are teaching ... this is a great series and you've helped greatly in my understanding of the workings of my Toyota and car diag. in general.... ps.... love your analogies... they're spot on. Many auto diag teachers either leave out key info or steer their info for professional techs leaving us novices in worse shape than before... appreciative in Idaho

[@AlexBAlixir98]

Ahmed. Wow! I had to watch this one twice. Amazing all the things happening when we run our vehicles. Also amazing how you are able to look at the data to diagnose issues and what the numbers mean. Its great that you explain how all of this work. Thank You.

[@efrenr446]

I have watched many videos wanting to learn about fuel trim and all the same, but this video is long but with a better explanation of various situations and scenarios. thanks and thumbs up.👍

[@BedjamRivera]

This is actually great information because I feel like one of my cars has a leaking injector but it's not throwing up any codes and the car runs perfectly fine. I can use those techniques you just taught me to check if one of them is actually leaking. As I said in one of my previous posts I'm a mechanic but I specialize more in suspension work. And I don't just deal with Toyota's I deal with all kinds of cars. This is why I love your channel because you go into detail on things that I can learn use to better diagnose issues.

[@rossbeck1595]

This is the best explanation of STFT and LTFT I have ever seen!! Bar none.

[@sambitar8448]

HI, AGAIN I LEARNED HOW HELPFUL THE TOYOTA SCAN TOOL IN ITS ABILITY TO ENRICH AND LEAN OUT. NOBODY HAS SUCH INFORMATION THAT VALUABLE ON ANY STUDY CASE. THE DATA YOU SHOWED US IS AS CLEAR AS THE SUN LIGHT. KEEP UP THE GOOD WORK. THANKS A MILLION, MAY GOD PROTECT AND KEEP YOU.

[@cleandellcathey5967]

Thank you for this video! I had to rewatch the video a few times to get a good understanding, but I was able to find and fix the issue in my 2007 lexus is250 and learned a lot of useful information for future diagnosis. No more check engine light, plus my my LTFT went from 26% to 1% after issue resolved and I'm happy with my fuel efficiency now. You're the best man keep doing what you're doing!

[@kingfixtech]

I'm supure amazed by how you bring your explanation to everyone ones level of understanding.... I honestly don't know how i vane across your channel but I'm very grateful for coming across your channel and meeting a well educated and full knowledgeable technician like you... You're role model to the car repair industry ❤❤❤❤

[@sandukanec]

Thank you again for the information! I knew some things, but now they are much more clear.

[@Charkatak]

Good that I found this video! On my 2010 Acura, LTFT is about +2.5 and STFT is +5/6 and it seemed that system was adding a bit of fuel which indicate a "lean condition". After listening to what you have said "this isn't an issue at all as system is able to compensate..." Just wanted to improve MPG a bit, but I guess I will let it slide and have a better sleep at night :)

[@MitchGaar]

I love the way you explain the technical aspect of engines, parts nd how they work! Great Channel, my friend! I watch all of your videos. I was a mechanic for 37 years on my Dads Tree farm. But now retired and do Mobile Mechanic Service! Thanks for the great info! You are very taltented!

[@vinnycent007]

Thank you for the amazing videos! These video has definitely reduced troubleshooting time for my DYI work and increase the longevity of my FR-S and 2 Scion tCs. Keep up the great content.

[@SatheshSivashanmugam]

All IC car owners should learn about the obd basics and Fuel Trims. This is one of the best videos by Car Care Nut. 💯

[@KevinHernandez-vh9dl]

I like to watch diagnostic vids for curiosity and always see these charts and never knew how it worked now it feels like i put on glasses 🤓 because i was blind. Thanks for teaching this stuff.

[@CountryFarmBoyUSA]

These are the best videos as it shares your years of experience with us DIY mechanics that don't fix our fuel systems everyday. Thanks again!

[@chrisatkinson4389]

I have learned so much from your video and it has helped me to diagnose and successfully repair my daughter’s Mazda 3. Thank you.

[@prestonrobinson4424]

Not only have you taught me hiw to actually look at fule trims, but you alleviated some concerns. Thanks!

[@strtkempo]

You got a sub and a like for this video. Concise to the point and thoroughly explained without overdoing it. Can't wait to watch more and learn more. Thank you

[@kerrybryce5506]

Excellent - So glad you exist and want to share your knowledge! I was a mechanic in the late 60's to the late 90's - my have things changed! You are a lifesaver! Thank-you.

[@marty4809]

Learning more about fuel trims. Thank you. Between you and scanner danner and schrodingers box I might get it. Glad you said the part about not having ltft at zero. I guess some people are just lucky to have perfect engines and conditions.

[@sambitar8448]

HI, YOUR TECHNICAL INFORMATION ARE THE BEST ON KZbin FOR THE CASE STUDY THANK YOU.HAVE A HAPPY HOLIDAY

[@rpo69z28]

This is the best educational explanation of an 02, and wide band air fuel sensor I have ever viewed, 😮 and I didn't know about the brake fluid hack on the sensor threads that get stuck. Thank you for sharing.

[@marklyn5779]

Thanks AMD for making these videos. I've always wanted to know how to interpret the readings of my Autel scan tool (other than read and erase codes). After watching your videos, I am starting to understand the data and the reason for them. Please keep up the good work. May the Lord bless you and keep you safe.

[@maclaudeamumbwe2663]

hes helped me alot too

[@faustogonzalez8397]

Thanks Car Care Nut, I especially like your tip on diagnosing/detecting a faulty Injector depending on whether you execute the Run Rich test or the Run Lean test. Makes lots of sense, thanks again !!

[@darrelltran4502]

Thanks for your help me learning fix my car problems, god bless you and your family

[@oldman3454]

Thanks for the great explanation of engine tests. I am no longer clueless, just old.

[@kennylavay8492]

Very good knowledgeable video. showing the results instead of just talking about them . Today sir you get a raise in pay. Keep em coming.

[@ziyadsalma7265]

Im from morocco you help me lots thank you so much bro

[@mikechiodetti4482]

Fuel trims can throw you. For example. Watch when your LFT reads 12.5 and your SFT reads -10.5. This can confuse people, but actually, your TOTAL fuel trim is +2.0 or 2.0. The short trim is removing fuel, but the LFT is taking its time to reduce. I've seen this after a repair. The fix was to reset the fuel trims and watch. The engine has about 40K on it and the SFT reads from -7% to +7%, and it stays that way. There's other scenario's, and only by learning how SFT and LFT work with the AFR sensors is it understood. I saw one Ford V10 van that both banks LFT and SFT reading at +25% each for a combined TOTAL Fuel Trim of 50% each bank. This was at idle. As the throttle was opened slowly to 2000 RPM's, LFT's and SFT's settled down with LFT's approximately between 6 to 8% and SFT's approximately between -7 to +7%. At idle, the van shook so bad, I thought the ladders would fall from their roof racks. The cause was a tear in the PCV hose on the bottom of the hose near the port on the throttle body. Ford had an upgrade for this with a thicker hose material. With the the new hose installed, fuel trims came down, no more shaking and all was well in Ford land. The tear wasn't big, only about 1 inch long, but the engine heat and vacuum caused the tear to turn inward toward the inside of the hose. It was that thin! A tech learning about fuel trims needs to work with vehicles that are running good to get a baseline understanding of that system. Disconnect then reconnect a small vacuum hose and watch the readings. I had to learn fuel trims AND the Ford WDS diagnostic system we had before we got the IDS which I understand is still in use. Thankyou for this video.

[@TheCarCareNut]

Very well said my brother. Knowing what’s normal is key to knowing how to diagnose.

[@shitbrake10]

Great video!!! Was always a little confused about open loop and closed loop but now I fully understand how everything works together. Again, great job and keep up the good work.

[@shaazy]

What a fantastic video! Was diagnosing a strange "low fuel pressure sensor signal stuck in range" situation on my Tacoma, but ended up here. Learnt a lot!

[@jotu173]

Thanks for another EXCELLENT video & explaining the Long and Short trim levels. After viewing and listening to your analogy, I am fairly certain that it would be a lot less confusing (and not even require an analogy) if Toyota had called short term trim something more accurate like "real time trim data". Same goes for long term trim which, in my opinion. would be MUCH more easily understood if it was referred to as "rolling average trim data".

[@PS-pe6nc]

Thank you so much for explaining all this. I’m definitely learning. You’re a very good teacher! 🙏🏻

[@lukestoyz]

Great video well explained. Please show a video on live screen when you have a bad wideband or a bad o2 sensor.

[@docvince100]

excellent as always!!! best automotive educator in yt!!!

[@armandohernandez7353]

Great explanation of fuel trim and how to read the data.

[@gilbertnunez732]

Great demonstration! Best explanation on fuel trim diagnosis.

[@p6102zrfxe]

Thank you AMD for another wonderful video. With every video is going better and more interesting (complicated). I found oil change suggestion seriously, after watching video about oil consumption. Today I changed oil after 6 months and 5k kilometers. Guy in toyota dealership was confused why I'm asking for oil change just after 5k. 🙏

[@TheCarCareNut]

Thank you for watching my bother. I love service advisors and mechanics who would do the 5k oil changes to their own cars but be confused when customers ask for that.... interesting right?

[@p6102zrfxe]

@@TheCarCareNut After oil change I found engine work much more smoothly. I will keep 6 months oil change interval.

[@TheCarCareNut]

Yep! Works like a charm! I always could tell when opening an engine with 10k oil changes abs 5k oil changes. The difference is big

[@sciCHD]

Hey ! hello from Geneva Switzerland, I discover your channel and it's always very informative and detailed, thank you for all this work !

[@C-M-E]

Golden info here, told me everything I needed to know to make a much better pinpoint if I have a fuel or spark issue. Looks like I'll be ordering coil packs!

[@glennreo5443]

Thank you! That was very interesting. Please do more of these diagnostics with other probable troubleshooting scenarios using live data. . Maybe you could use the xtool D-8 scanner. That's the one I recently purchased. I'm a life long auto student and I consider you one of the best Toyota Guru's out there. God Bless

[@needhelp2453]

Thanks for showing what normal live data looks like!

[@singachuotodiy]

great video, precious information how to look into the data. More of this please...

[@marwinvictolero9838]

thank you very much.always looking forward to the next video:please keep them coming

[@gruvonya4681]

AMD I understand now about fuel trim and how the numbers relate. Excellent video and cutting edge knowledge you're teaching me. I will watch a few times to fully understand. I have a Autel 808 scan tool.I need to understand all the numbers. I now know fuel trim. Keep the info coming about scan tools and how to understand all the info they give please! Thanks my friend. Randy

[@TheCarCareNut]

Thank you for watching Randy and thank you for the feedback. I felt another live data video would be helpful to this series as the data shown in this video is likely 1/10 of the data available

[@lightman489]

Dr Ahmed that was a very interesting video seeing how a professional diagnosis technician is able to pin point problems. I start throwing codes with a high mileage vehicle i replace every sensor coils and injectors,looking forward to the catalytic converter diagnosis my rule smell them replace them all along with sensors

[@davida871]

This was great. Dont know why this video didnt show up in my feed before.

[@richardlewis4288]

Your explanations are top notch! Really enjoy watching your videos!

[@FFWrench]

AMD thank you so much for making this video! I have been trying to teach people this exact concept for years! Well explained!!!!

[@hinene]

Thanks for showing how it works. I'm trying to diagnose a p0420 in my daughter' nissan versa ( I know you specialize in Toyotas but i also own a couple two of them. A tundra and Rav4)and wasn't aware that O2 sensors are now wide band sensors. I wanted to diagnose a possible leak in the exhaust system before I condemn the Cat converter. Very informative and much appreciated. 👏

[@christopherm7702]

Thanks, AMD, your the MAN!!!

[@renfrewdashcam1177]

I know right he's so amazing such a good lad

[@shinola228]

Really great video. The best I've seen on the subject. Thank you for making it.

[@samueladams2649]

Excellent video but I'm going to watch it again and again so i can really understand fuel trim.

[@Mitaka1976]

Thank you so much for all the info on FT, Very very good video !!! Keep up. 👍

[@richardsauer599]

Great video! I learned a lot from this! Thank you for taking the time.

[@VILSONDUSEVIC]

This is the video I was waiting for!!! Thanks AMD.

[@billspeight8936]

Thank you for this and all your videos. They are all very much appreciated.

[@lennex04]

Thank you so much for all your videos ! You've been helping me so much lately!

[@steveandsheryl]

You're Great!! thanks so much. If only Dealers and the Govt. would invest in people who have a propensity for understanding this sort of thing instead of wasting so much money trying to send people to college to "learn" about ridiculous degrees. I considered changing into automotive repair 20 some years ago. With my strong electrical and electronic back ground I really loved this stuff as a shade tree mechanic learning about the emissions and such on my cars. But I did not do it. I really think auto mechanics need some specialization , if it doesn't have it already. The cost of cars and their repairs is too much for our people and economy. We need better groups of technicians working together to solve problems faster. The cars themselves are amazing. Of course we need, maybe a better mix of technology and lessening the demand for continually better emissions and gas mileage.

[@alextarasoff4285]

Thanks!

[@Rickie-x2]

Thank you sir for the excellent Toyota classes. 😊

[@Fred-F4]

Thanks a lot! Using a cheap blue drive I could diagnose my CRV bad MPG. It was a O2-S1 sensor which is dead at 1mV!!

[@justascrub8855]

Fantasic video awesome. Please do more of these.

[@ksajan16]

Great Video! Thank you!

[@cal48koho]

very useful AMD. I am awaiting my first scan tool to sort out problems on my "new" 98 4R.

[@can-cruiser]

Excellent video and explanation.. Many thanks...

[@CPAD]

Great video, Thanks, Love it!

[@lowkd5465]

TOYOTA SHOULD USE THIS FOR A MODULE WELL EXPLAINED

[@mikecont9742]

Great explanation of fuel trim…

[@gunter8889]

Thank you for the EXCELLENT video. It was very informative. You mentioned "don't chase a 5% fuel trim." I understand the logic behind that. But at what % should one become concerned? I heard somewhere plus or minus 10% long term fuel trim is acceptable. If more than plus or minus 10% long term fuel trim, then the underlying cause of the fuel trim adjustment should be examained. Did you agree?

[@KLNYC]

i know this video is 2 years old.. Great explanation.

[@christianramo]

Thanks for your orientation, could you talk about oil based in natural gas , like Penzoil here in 🇺🇸, vs convencional oil made from petroleum?

[@JUSTINMARTINEZ-e6b]

Thank you, very well explained.

[@andyrobert1234]

Thank you so much l. I learned a lot. God bless you

[@gzhang207]

Absolutely love this episode. I am poking into the fuel trim on my 98 and 99 Camry. My Camry is in fuel trim rich condition under idle (about -7%), but they would go back to normal under driving condition. I suspect it may be due to a partially clogged IAC. I wonder if there is standard / reference values under idle for use to compare to.

[@TheCarCareNut]

Thank you for watching! So many factors could bring the fuel trim down but it also could be normal for the age of the car. Let me ask you this, do you have any symptoms?

[@gzhang207]

@@TheCarCareNut No obvious symptoms. The 98 Camry I4 feels lack of acceleration and the fuel trim does respond quickly after I replaced the fuel pressure damper. This may be unrelated and I may be pushing for perfection. The 99 Japan made Camry V6 feels as new.

[@TheCarCareNut]

Honestly I wouldn’t chase after it. Wouldn’t hurt to clean the IAC though

[@andyg5004]

I just replaced the downstream o2 sensor on my 2011 rav4 4cyl 130k miles and prior to replacing the sensor i have mentioned the readings below but after replacing it at idle the long term fuel sensor is at 0% and while cruising at 75 it’s at 7% but it goes up and down based on throttle position. So I think there has been a significant change after the downstream sensor replacement. I will keep an eye on it and read fuel trim numbers

[@geecrawdad]

That was great and, on the contrary, not long enough! But I'm not complaining 😊

[@flagmichael]

This clears up a lot for me!

[@vunvunoffroad5692]

Thank you, sharing your knowledge is really appreciated, helps a lot.

[@xmikomix]

Amazing video! I'm diagnosing my Lexus RX400h since it's throwing a "too lean" error constantly and my AFS voltages are off the charts (hitting down to under 2V and up to 5V) and also my Fuel trims are also going crazy (Long FT would even reach 50%) and then my Injector port goes way too high at 5ms so something is certainly going very downhill with the engine. Looking at possible air leak (hopefully that's it) and will also be looking into changing injectors as a start.

[@bwest-yq3uc]

Educational video... sure could use a scope of some sort. ...... Question.... fixing to buy a new auto....Looking at the Lexus RX350L and the Mazda CX-9. Any pros and cons of each? Appreciate your input' The Mazda is cheaper but that is not the issue. It drives nice and has low torque. The Lexus is comfortable, etc. Appears similar to a Highlander.

[@TheCarCareNut]

Hi! I honestly don’t have experience with the current CX-9 to give a fair comparison but I know the older ones were absolute junk. The Rx350 and highlanders are very good SUVs more focused on reliability than drivability which is where the CX might have the upper hand.

[@jimkellberg]

Outstanding presentation.

[@Akibzayd]

I learned alot with this video thanks for your effort

[@GripFreak]

Great video with pro tips! Thanks for sharing!

[@Russpeed301]

I'm in the 11th minute and I think this is your best. A bit ambiguous when you say Fuel Trim sometimes as uncertain if you mean long short or either. I go back to the vid now.

[@donnyboy146]

Really good training video. Thank you for doing these.

[@NyteSl8r]

you look like John Travolta here lol...btw amazing videos and learnt alot...Thank You AMD

[@rowlandcrew]

The demo was not too complicated. the complication that could use some of your strategies is how to do this on the hybrids (e.g 3.3L V6). the issue is that the engine will shut off when we need idle data. driving at a steady slow speed is also not too practical since the hybrid will turn off the engine and run on batteries. dragging the brake-maybe? ideas? thank you

[@g5153]

Very informative. Great video 👍. Many thanks.

[@kualalkuolom]

Professional seminar. Thanks!

[@kevinparr4823]

Wow that's so informative I'm assuming it will be the same for all engines? Great video 👍

[@TheCarCareNut]

Yes that is the standard for OBD2

[@muhindojehoiadapatience4455]

Have learnt alot. Can you kindly talk about techstream, can it be used to do reprogramming and keys immobilizer

[@andyg5004]

My short fuel trim is ok I replaced the air fuel ratio sensor last year. My long term fuel trim at 75mph is 7%. I am replacing the o2 Sensor after the catalytic converter. My long term fuel trim was at 1.6 % then it jumped to 7.8% and then down to 7% when cursing at 75mph on the the highway.

[@TheCarCareNut]

Hi! That’s normal.

[@RCG1211]

Thanks for the feedback I have read that the 02 sensor after the car could have upto a 30% on fuel trim.

[@negativeproton1120]

Thank you for your videos. Any recommendations of how much grease to put in 2016 4 Runner driveshaft slip joint? I have read 4-5 pumps, or until the slip joint moves, or until grease starts to come out of the slip joint seal. The u joints are straight forward, but the slip joints there is a lot of confusion. Any advice would be greatly appreciated. Thank you 🙏

[@TheCarCareNut]

Hi! Until grease comes out

[@silverbankruptcy]

I feel like I signed up for a Car Tech Class and they forgot to send me a Tuition Bill! Glad there isn't a test at the end.