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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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48 thoughts on “Hyundai tucson: will not run a drive cycle”
  1. Avataaar/Circle Created with python_avatars Nancy Zarate says:

    what are normal fuel trim numbers.

  2. Avataaar/Circle Created with python_avatars ED Harry says:

    Eric , you are right on on all counts!

  3. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    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 ๐Ÿค” Good Video Eric O @SouthMainAutoRepairLLC

  4. Avataaar/Circle Created with python_avatars Chris Bentley says:

    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.

  5. Avataaar/Circle Created with python_avatars William Bowen says:

    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

  6. Avataaar/Circle Created with python_avatars Enrique Suffle says:

    ๐Ÿ‘๐Ÿ‘๐Ÿ‘Mr O

  7. Avataaar/Circle Created with python_avatars thermobollocks says:

    Diagnostic burnouts. I like it.

  8. Avataaar/Circle Created with python_avatars Gary Meredith says:

    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 .

  9. Avataaar/Circle Created with python_avatars Dwight Kinter says:

    "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.

  10. Avataaar/Circle Created with python_avatars AngryDINGUS says:

    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 ๐Ÿ˜‰ Jk JK. Great video and diagnosis as always.

  11. Avataaar/Circle Created with python_avatars Bill Scott says:

    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.

  12. Avataaar/Circle Created with python_avatars Vela Bela says:

    ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜ he's so sexi ๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿคค๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹

  13. Avataaar/Circle Created with python_avatars Andrew The Auto Tech says:

    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.

  14. Avataaar/Circle Created with python_avatars Shane Harrison says:

    Kool another fine repair and diagnoses

  15. Avataaar/Circle Created with python_avatars Shane Harrison says:

    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

  16. Avataaar/Circle Created with python_avatars Alexis DeVille says:

    You need to get a new hat, the brim is wore out ,

  17. Avataaar/Circle Created with python_avatars Jim Phillips says:

    Still didn't catch when or where you showed the o2 sensors operating properly so the car would finish all the readiness monitors

  18. Avataaar/Circle Created with python_avatars Paddy Hanna says:

    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???

  19. Avataaar/Circle Created with python_avatars Donnie Robertson says:

    Great job again like always

  20. Avataaar/Circle Created with python_avatars Edward Thayer says:

    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!!!!

  21. Avataaar/Circle Created with python_avatars william anderson says:

    What better way to give customer value and satisfaction than by letting the customer watch these clips on youtube? Nice one mrO

  22. Avataaar/Circle Created with python_avatars Matt Man Productions says:

    I just came to watch Eric power brake in the parking lot ๐Ÿ˜‚

  23. Avataaar/Circle Created with python_avatars Jack Hayes says:

    Hi Eric here in northern Ontario Canada I run studded tires on a 4wd gm pu just great in our conditions.

  24. Avataaar/Circle Created with python_avatars dwoodog says:

    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.

  25. Avataaar/Circle Created with python_avatars misty says:

    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 ๐Ÿ˜Š

  26. Avataaar/Circle Created with python_avatars Elwood Noble says:

    Why did your video of the junky gas in car cut off so quickly before answer!?!?!

  27. Avataaar/Circle Created with python_avatars Tony Hekopiano says:

    I wish I could find a mechanic like you local to me.

  28. Avataaar/Circle Created with python_avatars Erik Johnson says:

    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

  29. Avataaar/Circle Created with python_avatars Josh Clark says:

    Why does a skewed MAF sensor not let the O2 monitors run or the other monitors also

  30. Avataaar/Circle Created with python_avatars Tracy Carver says:

    Who and why thumbs down?

  31. Avataaar/Circle Created with python_avatars Russ Montgomery says:

    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.

  32. Avataaar/Circle Created with python_avatars Ronald de Rooij says:

    No break cleaner? Impossible!

  33. Avataaar/Circle Created with python_avatars Sm Ms says:

    SWEEET ๐Ÿ‘ ๐Ÿ‘

  34. Avataaar/Circle Created with python_avatars Sm Ms says:

    Did You Clean The used MAF Sensor Before Install.?

  35. Avataaar/Circle Created with python_avatars Matthew Gorgoglione says:

    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…

  36. Avataaar/Circle Created with python_avatars A Physics Professor says:

    Bald tires in western New York State. Absolutely nothing could possibly go wrong.

  37. Avataaar/Circle Created with python_avatars Kilolocks says:

    I'm a locksmith, I winced hard when the door closed on the bolt. I heard that thunk all the way over here!

  38. Avataaar/Circle Created with python_avatars Michael Pistilli says:

    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

  39. Avataaar/Circle Created with python_avatars Dave Blane says:

    Talk about RUGGED outdoorsmen!

  40. Avataaar/Circle Created with python_avatars Buddy Guy says:

    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.

  41. Avataaar/Circle Created with python_avatars Phillip Jones says:

    Wow a double hatter must be cold

  42. Avataaar/Circle Created with python_avatars Lawrence Lamson says:

    clean it??

  43. Avataaar/Circle Created with python_avatars Lawrence Lamson says:

    exhaust leak/intake?

  44. Avataaar/Circle Created with python_avatars Jesse W says:

    Anybody else concerned about 100+ deg F air intake temp? It's snowing, that can't be right…

  45. Avataaar/Circle Created with python_avatars Art Houston says:

    Did you say "Chewbacle?" Is that like a star wars debacle?

  46. Avataaar/Circle Created with python_avatars Clifton Wooldridge says:

    Eric the car whisperer!