2010 TOYOTA COROLLA - CAN BUS INTERMITTENT ISSUE

[@SuperMarioDiagnostics]

I made an incorrect statement. I said that a shorted input to a module can bring down a CAN bus. After being given a heads up by Paul Danner, I didn't want to misinform the public, and cause unneeded work to the viewer. The yaw rate sensor is a module on the can bus in that video(an oversight of mine). The CAN wire to that sensor/module was shorting to ground, causing a problematic CAN waveform. While in my video I did say that a yaw rate circuit issue can bring down the entire network, that is true, but in this case it's part of the network, and yet I deemed it an input. A shorted 5vref however can cause communication issues to its module. But it WILL NOT cause a CAN bus to go haywire. Only a lack of communication to that module. BIG DIFFERENCE. The last thing I want is for someone to see my video, take what I said, see a bad CAN waveform, find the culpable module, but then needlessly depinning inputs or further testing to rule out inputs to that module as an issue. The intent of all my videos is to aid in this craft, not to create needless work for its viewers.

[@BrianMann216]

Nice job! Some are easier than others for sure, but its not luck , it's your knowledge and skill that found it!

[@DuanesDiagnostics]

That's CRaZy man!.....I just had a 2010 Corolla with the exact same symptoms.....the exact same signal you had on CAN high.....and CAN low was shorted......no tach or speedo.....and couldn't communicate with the CAN network on my scantool...... I unplugged the ECM and Brake Module just like you did, but made no difference.......I studied the diagrams too and was gonna go for the junction connector just like you, but honestly looked and couldn't even find it, seemed like it was buried.......so on a hunch, and what I had heard and read from others.....and from studying the diagrams......I decided to unplug the steering angle sensor......and.....BLAM!!!!!.....that restored Comms, and the tach & speedo & everything.......the only code left in it is for that steering angle sensor because I have it unplugged...... And I just posted a video about it on my Facebook & Nextdoor page....and then just happened to come across this video of yours.......so felt like I had to comment about it.......yours was the exact same symptoms as mine, but 2 different sensors/CAN wire short locations......causing the exact same symptoms.......and exact same CAN signals.......that's pretty crazy to me.

[@kellyspeppers]

Back when I was working on medical electronics a good visual inspection was all the diagnosis I needed sometimes and add to this the smell test. :)

[@ginuwine11]

Good find Mario👀 , I enjoy the networking videos. Thank you, and Keep 'em coming! 😎👍

[@geoffrwelsh]

I'm of the height that I always slide the seat back before even attempting to get in a car so the next time I have NPF on some crazy symptom complaint I better slide the seat back and forth a couple times. Thanks Mo!!!

[@NewLevelAuto]

Awesome!! LIKE A BOSS

[@8power0]

GO MARIO , PLEASE KEEP THE GREAT DIAGNOSTIC VIDEOS COMING AND THANKS SO MUCH !

[@wyattoneable]

That's funny the way you found the issue, but really handy as well.

[@VoltageDropDiagnostics]

Great video, Mario! I haven't seen that issue, yet. But I have a feeling that I will eventually. Was there any electrical clips, or anything undone that allowed the harness to rub on that bracket?

[@SuperMarioDiagnostics]

Nope, i think they might've stuck an umbrella in there, bent the metal into the wire. That's my theory 😆

[@PineHollowAutoDiagnostics]

That was awesome! Great tips on the process, Mario. Like Keith preaches, don't be in a rush to touch stuff without first setting up your equipment and go one step at a time :)

[@SuperMarioDiagnostics]

Absolutely right! Thanks bud 👍

[@enriqueortiz6817]

Super Mario good video I have the same problem with my 2010 Corolla I can fine that problem but your video is going to help me thanks

[@ernestoruesta9446]

Did you find the problem,? I been looking for the past 5 days

[@CubasAutomotive]

Like Eric O says.... sometimes it's better to be lucky than good. .. 😂😂😂 Awesome video Mario!

[@andrewk778]

Chance favors the prepared mind. Thank you for sharing.

[@JoesAutoElectric]

So awesome brother! Great catch. You said it. Always keep an eye on what you touch! Great find!

[@baxrok2.]

Damn, that was lucky indeed. However, you made your point clear about keeping your attention on what you're doing. Well done.

[@mattpoole6364]

Nice catch, Mario! I wish they were all that easy.

[@Auto-Tech]

It was like whe say here in Baja : "como el burro que tocó la flauta" (i guess the translation would be "pure luck"). Great video Mario, keep them coming.👍

[@billyyoder8171]

Thank you Mario. Good job. Have a blessed and safe week.

[@ozzstars_cars]

Well that was crazy! Nice find lucky or not Mario.

[@High_Tech_Mountain]

Wow! Haven’t seen that before! Great diag Mario! Sometimes Lady Luck is on our side!

[@paulpaquette1961]

You really gotta love those moments, awesome share! Nice!

[@marksautoservicegillettenj4899]

Good work Mario. Simple videos helps us.

[@zeyadbashir5953]

Hi Mario.. I have two issues with my 07 civic.. Malfunction in line between gauge module and F-CAN... and the other issue is lost communication between srs and guage module.. Please help.. Is that mean faulty guage module?? Or something else???

[@EricCalebCullen]

I'm having trouble finding the location of those CAN junction splice connectors (for Toyota specifically) on Alldata, only finding the component connector locations. Is there even place in Alldata to locate them?

[@3rdracer]

great video, what is the name of that tool( or should i ask what brand) that you were using to see the waveform? thanks

[@goodautodiagnosticsllc7475]

Good find Mario! Good thing the seat wasn't moved when you got it. Could've caused issues then.

[@DylanRabier]

Wow that's crazy man 😁 This could've been a nightmare. Thanks for sharing! 👍

[@ScienceOfDiagnostics]

First....boom Great job Mario, that's a pretty cool failure mode.

[@neverstoplearning382]

You got lucky on this one. I am dealing with a Chrysler 200 that is driving me crazy. Regards pal.

[@billrimmer5596]

Super vid. Cool use of the u scope!!

[@fire7765]

Great job finding the problem.

[@odishoodisho4904]

Lucky and smart technician

[@themechanic6117]

top notch!! the dealer still wants to put a pcm in it for the 3rd time lol

[@olmosmobilerepair349]

Really nice video thanks for sharing the info

[@TheDisgruntledMechanic]

Good find! keep 'em coming!

[@spelunkerd]

Great example, another one where it is not the module itself, but a bad input. I wonder how often modules are replaced, only to find that the problem persists because of bad input.

[@nickjames9542]

Having the same issue same car same year 2010 Toyota Corolla le took it to the dealer an they can't figure out what's wrong with it

[@ernestoruesta9446]

did they find the problem ?

[@alexc7641]

Wish I was that lucky! What labscope is that by the way? Looks pretty neat.

[@SuperMarioDiagnostics]

They uscope from aeswave.com

[@stoneyburke2412]

Nice find Mario.

[@trainer2018]

Good job Mario. I take luck when I can get it too. 🙂

[@SuperMarioDiagnostics]

Thanks Michael 👍

[@juanheredia4426]

Buen video Mario

[@tommymarkham4202]

Very cool! I still have to use the Uscope that you convinced me to buy at SS! Lol

[@sonofmontezuma3732]

Wow u get on surprising me with every video

[@davidessien5465]

A client complaint that when he was on motion is airbag blew. Eventually, he noticed that the smoke was emanating from the engine bay. Hence, he pop-up the hood and saw that the smoke was coming from the ABS module. He called a mechanic to unplug the ABS module connector. Afterward, the connector was connected back. Henceforth, he has noticed that his steering is stiffer to steer. Additionally, he said : "the car isn't moving smoothly as before." Yesterday, he called and said even the headlight and other lights aren't working again in the car. The check light appears first, brake light second then finally the P/S light appears. They lights don't come out at once. It's a 2010 Toyota Corolla Le. Please how do I fix the problem?

[@autocarespecialist9590]

Nice catch Mario....

[@lawsonthursfield6950]

Great work... 👍

[@burtpilon1735]

Wow good one 👍🏻

[@weshawkins7165]

We all need to have some luck from time to time. Makes up for all those pita diagnosis’s.

[@jasonc.4683]

Good find Mario. 😁

[@pedrolfernandez7286]

Thanks for sharing….

[@joshstaton508]

Nice find 👍

[@naushadali95]

Awesome!! Video.

[@mikemartinez1705]

What type of osciloscope did you use ?

[@SuperMarioDiagnostics]

The uscope

[@LTFT83]

has anyone came across this error code but the car still runs? 09 Corolla.. reset and light comes right back on but it still runs..

[@scuba422123]

nice find Mario! if I was still at the dealer I would write that up for 5 hours warranty of course

[@gonzgarr1592]

nice find sometimes a little luck goes a long way

[@markferraro5250]

Thanks Sm

[@lovetolearn5253]

So I finally found the issue. I thought it was in the back door because I unplugged the harness leading to the back door and lost voltage. That harness ended up also feeding the blue tooth module in the rear of the car. The module waa covered in water with green crust all over it. This was one of the hardesss draw I had because no codes all the diagrams on alldata and Identifix was wrong or misleading. The amp draw waa really small and intermittent crazy one. I feel embarrassed I have around 5 to 6 hrs in it. I believe they auction this car because of that issue. Everywhere I looked bolts where missing.

[@Okie-Tom]

Every so often you get lucky!

[@stephenmarshall5302]

yip, good advice brother

[@billyr9840]

Nice !

[@smms5056]

👍👍

[@capt251978]

I’ve found, when dealing with CAN it’s better to be luck than good.

[@stephencook4611]

Luck is always a good thing!

[@richardc6038]

the blue redeuse is Aka the green cusery

[@TravisAndrew1]

I got one taking me for a ride. Intermittent fault every 200 miles

[@zeke112964]

Sometimes it's better to be lucky than good!

[@SAAutoRepair]

I'll take luck any day. So what was the fix? Push the seat back and remove the adjustment handle? 🤣

[@SuperMarioDiagnostics]

😂😂

[@gregjones8501]

Not really! If you hadn’t had the uscope in place you probably would still be chasing that one bro! I was excited to see the problem lol you would’ve thought I was working on it! 😂

[@1supratech]

Nice find. Sometimes I would rather be lucky than good. Lol.

[@jamespower5520]

😀

[@cwj9202]

Sometimes it is better to be lucky than good. :-)

[@chadkelley8054]

See it always pays to properly adjust the seat for yourself. Even in a customers car!

[@ablackformula]

I'm thinking had he adjusted the seat when he first got in the car, he would've fixed it by mistake and not have been able to even verify the customers complaint.

[@stevehayes6661]

Sometimes it’s better to be lucky than good 👍🏻🇺🇸

[@steveguest8028]

I can’t believe you got that lucky 🤣

[@SuperMarioDiagnostics]

Oh yeah 😆😆😆😆 legit luckiest find

[@jamesdean5087]

LOL

[@joemasterman4305]

Good lord, imagine if you didn't find it by moving the seat! Sometimes it feels like you got somebody upstairs trying to help you with flat rate huh?

[@SuperMarioDiagnostics]

Exactly! 😆

[@davesterl]

Nice find Mario