This Hyundai Tucson was dropped of with a customer complaint of, "it will not run the drive cycle and it is due for inspection!" There are lots of inputs to the ECM that will inhibit the monitors from running and we quickly learn on this one that the fuel trims are off the chart! A little bit of testing leads us right to the MAF sensor as causing all of our problems. -Enjoy!
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair 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 South Main Auto Repair, 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 South Main Auto Repair
If an SMA Video has helped you out please consider giving using "Patreon" to help support us. The videos take real time to create and pull us away from real work that pays our bills. CLICK HERE: https://www.patreon.com/southmainauto
THANKS A MILLION!!
--Eric O.
OTC VE Calculator: https://www.otctools.com/ve
PICO MAF Files From This Vid: https://drive.google.com/open?id=1tfeWyeKH3HMPtcetEcndI4MR5dw26BYg
FREE PICO SOFTWARE (Must download to view files): https://www.picoauto.com/downloads
Pico 4425: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=http://www.aeswave.com/4-channel-PicoScope-STANDARD-Diagnostic-Kit-p9276.html'>https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=http://www.aeswave.com/4-channel-PicoScope-STANDARD-Diagnostic-Kit-p9276.html
AES Wave uTest Kit: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=https://www.aeswave.com/uTest-Advanced-Terminal-Test-Kit-p9573.html'>https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=https://www.aeswave.com/uTest-Advanced-Terminal-Test-Kit-p9573.html
If you don't like Patreon feel free to use the "PayPal Me" link: https://www.paypal.me/SouthMainAuto
The South Main Auto Amazon Store: https://www.amazon.com/shop/southmainautorepairavoca
AES Wave Automotive Diagnostic Tools: https://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=2525b91fc8e906e8215984074c9d9e8f&go=
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--Eric & Vanessa O.
Feel like sending some swag to SMA because you love the videos but don't know where to send it?
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Avoca, NY 14809
Disclaimer:
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what are normal fuel trim numbers.
Eric , you are right on on all counts!
Very interesting and intriguing issue Seems like aftermarket junk for the Maf Sensor Under Reporting and Causing the system not to run the rest of its checks 🤔 Good Video Eric O @SouthMainAutoRepairLLC
You said before you are no electrician but watching this video amazed me with your deductive reasoning and explanation. This video is top notch. Very well explained. Thank you.
If you can do it,I can do it.right?Well,on this one,I am not convinced. I'M not there yet
But,hats off to your great treasure grove of experience in car trouble shooting does make sense. Great video
👍👍👍Mr O
Diagnostic burnouts. I like it.
Eric you always say to check the basics I never even saw you check the air filter on this car the problems of the mass airflow sensor how clogged up the air filter is .
"We get some snow here and it turns into a chewbacle". Chewbacle – A cross between Chewbacca and a debacle. Hoth like, the weather must be.
I watched 10 minutes and gave up. Obviously they need a new MAF, all 4 O2 sensors, a PCM TCM and BCM. And don't forget the new spark plugs and wires all around 😉 Jk JK. Great video and diagnosis as always.
Great video Eric. Having an issue with my chevy malibu with the maf sensor. Thank you .Your information was very helpful. Enjoy watching your video channel. Maf sensor messing up with a short. Installing a new one tomorrow.
😍😍😍😍😍😍😍😍😍😍😍 he's so sexi 🤤🤤🤤🤤🤤🤤🤤🤤🤤🤤💋💋💋💋💋💋💋💋💋
Right when u got to the point where the fuel trim was high under load means the MAF is bad! No reason to do any other tests. If fuel pressure was the issue then your VE would be high. It is independent of fuel or spark, VE is just how well an engine breaths. So the only other factor is a tear at the intake boot after the MAF. But I love how in depth you got with this diag.
Kool another fine repair and diagnoses
99 dodge slt pickup always telling that the monitors weren't ready 10 day ran out 3 times still hadent run the monitors bank 1senser 1 not ready bank 1 senser 2 not ready and bank 1 senser 3 not ready same reading for bank 2 sensor 1 ,2,3 and I finally junked it no rust new motor and diff fresh tuneup I called Gary's u pull it and they sent a rollback and I backed out the dodge and drove it on to the truck new springs hangers shocks and shackles.
And sent the 97 jeep grand cherokee lorado the frame was flexing and not repairable . The pickup went because the dealer tore up the wiring and would not repair what they broke
You need to get a new hat, the brim is wore out ,
Still didn't catch when or where you showed the o2 sensors operating properly so the car would finish all the readiness monitors
If the re trace is supposed to be the 5V supply to the MAF, why is it around 3.4 V on the scope and the output exceeds supply voltage when you blip the throttle? Different scale???
Great job again like always
Hey SMA, I hope all is well for you! I have a 2012 Hyundai sonata 2.4 that I need to take through inspection. But the o2s monitor will not become ready. It's the only 1 and I'm about to jump off a bridge over it. I've tried to many things. Drive cycles, over 4 hundred miles now. It will not set. Please give me any of your thoughts or suggestions!!!!! I'd greatly appreciate it! Thank you for your time!!!!
What better way to give customer value and satisfaction than by letting the customer watch these clips on youtube? Nice one mrO
I just came to watch Eric power brake in the parking lot 😂
Hi Eric here in northern Ontario Canada I run studded tires on a 4wd gm pu just great in our conditions.
I think on some of these scope/diag videos you need to remember I'm watching it and dumb things down a bit. Instead of just saying this looks too high, or too low, take and extra few seconds to go over what we should be looking for. But still a good video.
Hello Eric, thanks for empowering AMERICANS to b self-reliant! WHAT happened to the Toyota tundra you were driving in the video? I thought you owned a Honda? Thanks Chris from NYC 😊
Why did your video of the junky gas in car cut off so quickly before answer!?!?!
I wish I could find a mechanic like you local to me.
Non-mechanic here. Do manufacturer-specific scan tools have "known good" data for each model? It seems like that would be a good thing instead of having to dig through forums to see if anyone posts the data. This is probably a stupid question but I'm ok with that hahaha
Why does a skewed MAF sensor not let the O2 monitors run or the other monitors also
Who and why thumbs down?
Snow tires? We have no need for such beasts here in N.C. We got like 4 inches of snow here once but it was gone the next day.
No break cleaner? Impossible!
SWEEET 👍 👍
Did You Clean The used MAF Sensor Before Install.?
Thoughs moniters together not setting, usually clean the throttle body, air filter, MAF sensor and replace pcv valve on the Hyundai s, and a 299 Mile drive cycle does it…
Bald tires in western New York State. Absolutely nothing could possibly go wrong.
I'm a locksmith, I winced hard when the door closed on the bolt. I heard that thunk all the way over here!
General rule maf sensor g/s should be close to liter size of engine at idle loads off example 4 liter engine about 4 g/s I have found vacuum leaks by noticing the g/s low
Talk about RUGGED outdoorsmen!
I thought the MAF signal graphs were interesting so I looked at some online and supposedly that initial spike should roughly match the full load voltage, as the intake manifold has to be filled after the throttle is opened first before you get something like steady state flow, so air rushes past the throttle initially at partial throttle. Once the manifold pressure equalizes then the voltage drops as the flow slows down. The bad graph has a lower voltage on that initial spike, which is indicative of a bad sensor (I even saw Bosch specify 4.5 volts which coincidentally or not matches what you saw on the good graph. Maybe that's a common number). The bad graph also has a weirdly linear slope up that I don't understand, but I wonder if the loss of detail is due to fouling on the sensor grid slowing down temperature transfer and thus stretching out the time it takes for the actual metal to change resistance. Who knows. I certainly don't. But I'm very curious if you've ever attempted to use a cleaner on a MAF to see what happens.
Wow a double hatter must be cold
clean it??
exhaust leak/intake?
Anybody else concerned about 100+ deg F air intake temp? It's snowing, that can't be right…
Did you say "Chewbacle?" Is that like a star wars debacle?
Eric the car whisperer!
Have sanfe that won't crank then itsspins over and fires up so many parts have been thrown at it already my thinking it's a ground issue starting early in the morning to solve this I also have cpk code
I have a new Pico Scope, so I'm still lost with getting it to do like your doing on a known good Nissan Frontier. I do see what your saying about the MAF and the fuel trims. Is that a Launch Diagnostic tablet? It looks familiar, like my Matco MaxMe. I used to use the "pull up" parking brake to slow the vehicle so the monitor (s) would continue to run. That worked.