Bad Engine Computer Testing Part 2

Want more information on the 5v ref. circuit? Click on the link below and join my class as we discuss this case study.

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!

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[hardtopte]

I'm not normally one to comment on YouTube videos, but yours are in another league. I left a national chain and dealership auto repair work for another career altogether. Even in my new career, i find myself forced back into car repair through maintenance and repair of my own vehicles and those of friends and word of mouth "customers." I am pretty confident I have watched every video on your standard channel and have actually used two of your case studies (Ford Taurus Fuel Pump and Corolla MAF) as well as your amazing video on fuel trims to DIRECTLY and CONFIDENTLY repair vehicles. Specifically, even with a good track record (large parts of which were probably luck) for 1st time repair, I feel more prepared than ever thanks to the symptom knowledge that allowed me to "see" what I was seeing and hearing, diagnosis ability which allowed me to confidently identify the problem as the true cause of the complaint, and repair the problem once and for all. Your work this far has been invaluable and I assure you even though I am at best a side job DIYer in the professional sense, I will be buying your book and paying your knowledge forward. I'm not sure if you will ever read this, but if anyone else does, I hope this comment let's them see your work for what it really is. Changing parts is generally the most expensive way to fix a problem. Your channel brings the art of diagnosis to those without the ability to learn the hard way and without the path that brings them to a school with instructors like you. Thanks again!

[faustogonzalez]

DITTO the comment below, could not of said it more effectively. Without Question, Paul your teaching techniques, your approach to diagnostics, your sincere approach to your students are by far WITHOUT EXCEPTION the best automotive online resource. I've followed you now about 5 years and every video is a Great Learning experience for me. I am also a Premium Subscriber, the best decision I've ever made for online automotive resource information. I am amazed at how you effectively you diagnose and troubleshoot problems that have been misdiagnosed or blatantly incorrectly handled by the "Almighty Dealership Technicians".
KEEP UP THE GREAT WORK PAUL, KEEP THE VIDEOS COMING, you'll never truly know how you have impacted your viewers in such a Positive way.

[DJDevon]

Videos like these are what makes this channel so delicious.  I'm eating this stuff up and can't get enough.  Going back to show new data is great but seeing it done live (though longer video) is very important to having new techs learn real world scenarios where they can imagine themselves doing it in real time.  Your real time diagnostics are your best videos in my opinion.  Yeah they are a bit longer because thinking time is included but when you think out loud and share that stream of consciousness with the student; it is just as important for their education.  You aren't just teaching what to do but how to think and you expressing those thoughts out loud are invaluable to your students.  Excellent video series.  Bravo.

[edwardsaunders]

hi I came across your video, and as I started in the motor trade over 50yrs ago it took my attention. I have been across the years working on sidevalve  overhead valve  twin cams, electronic ign, fuel injection then computer controlled systems.  I wish I had you as a teacher years ago! it would have saved a lot of spanner throwing and door slamming.  best tutorial I have found.  by the way I come from the u.k.

[emenem]

very good teacher...many people would not admit to the "mistakes" made while troubleshooting. when I was learning to
repair industrial machines (automated lathes, presses, robots, grinders, etc), besides the sore rear from the bosses applying
way too much pressure reminding me how long production had been down, I learned the most from the mistakes that I
made. those stuck firm in my memory. good videos

[mattbranson]

You make me want to get I better scan tool lol I live in the multimeter era still but the amount of info you can pull with that thing is amazing and we’re at least 100 miles from a dealer to fix anything and most of the time they won’t anyways so we are always buried in similar situations your videos have really helped a lot of people in our area with just helping adapt the thought process that goes into our diagnostic system really appreciate your time that goes into these videos it really helps our small rural community keep up with the times especially with the machines getting more computers in them and no service techs available from the dealership a tractor goes down at harvest it can break some of these farmers so we have to fix it ourselves and your videos are vital to that much needed help thanks again

[harryjones]

Interesting case study. One of my previous jobs was to teach the GM CAMS computer to the techs in So. CA . Although the system is antiquated by today s standards the process is the same. The fact that the Techs did not understand the systems in vehicles is the root cause for not fixing it right the first time. It is very worthwhile to go to the scrap yard and to get the plugs for the most common cars and make them as pigtails and document and label them as to what they are. This saves the time to look back into the computer electrically and prevents having to rip the engine management system apart to test. Great that you show the guys cause and effect on various items like vacuum leaks. T-pins for looking into the plugs is also a great lesson.

[roadkill]

ckp-unplugged. Pcv line-broken/unplugged. Air intake line-broken/unplugged. How do we fix this? REPLACE TIMING CHAIN!! Priceless! I like your videos. They are most entertaining. And of course, educational. I too, have a 4.9l ford no start that's kicking my butt!! Been a parts changer since I was a kid. I have long since given up on the dream of being a mechanic when I grow up. Thanks for sharing with us.

[prmayner]

every time I need to be put in a good mood and forget about my little bullcorn world for a second I watch this video when you say "the crank sensors not plugged in" I laugh so darn hard i almost piss my pants, i can't stop, i wish i would have been in your class that day that was totally awesome. i think about how many times i've been in the same situation, but it's so funny i guess cause you talk about it for so long and are as sure as your standing there that the ckp is working, just like we all would do. you played it perfectly, naturally that's what made it so darn hilarious to me. your the best brother, glad i know you. God Bless.

[ozzstars_cars]

Fantastic, both Parts 1 and 2 on this repair.  The car probably didn't need a second junkyard engine from the beginning.  It's annoying that mechanics don't take the time to properly diagnose the problem and just start throwing parts at a problem without any evidence of failure.  Great job Paul as always.  Your enthusiasm  for solving these types of problems comes across loud and clear.  You take pride in your work to be one of the best!

[frankfrank]

Just subscribed to you after watching many of your videos. I was a ford technician for fifteen years before getting hurt on the job. It's refreshing to watch someone who not only knows his trade but also someone who obviously enjoys teaching it. You don't hide behind editing like some people do. You teach as you yourself learn what the problem is. You don't act as though you know everything. Which is refreshing to see. Thank you for your videos. They are enjoyable and educational to watch

[miguelalvarado]

Dan the man, this Miguel an xstudent who followed you for a time, i have a 2009 nissan rogue i was driving lites on dash came on, car staRted shaking then check engine lite had warning fix system soon, where 2 wires burnted from the horn circuit, harnes fixed, wont start just crsnks was a green wire against another wire all repaired, now the car cranks but wont start, checked for fuel ok, and no spark at the plugs, just cranks, if its the computers i want to make sure money wise as you've said 5vote check of parts, will check 2moro, still have books you sent me, great stuff, guy, good day from old timer to best detail oriented electrical teacher,

[sparkfixer]

Excellent class as usual! I really enjoy your style of teaching/learning/diagnosing a problem all the way through to the end and then going back through and PROVING what you've found. You are truly a professional that cares about your diagnosis and your students ability to grasp what your trying to teach them. I hope your students appreciate what they have in your class as it is rare. Keep up the fantastic job! Look forward to all of your teachings. Thank you and God bless you and yours.

[curlymyhero]

Scanner Danner---my hero again!! Well, just watched Vol. 1 & 2 of this series since I'm chasing down a 'limp mode' on my V12 Mercedes and whether my ecu is bad. Worse is I have NO fault codes so it is challenging! This video taught me that a 5 v. ref circuit means the ecu is good--as long as the grounds r good. Big relief. Also, y did that stupid dealer tech unplug the crank pos. sensor just to change out the bad ecu??? Then later claim the 'timing chain is bad'!! Wow!

[MrRcgillet]

in case you didn't know... you are absolutely briliant. I have lean so much from watching them. Thank You much.

[AntonioClaudioMichael]

No computer Likes positive power going through its ground circuits good series @ScannerDanner

[stevensapyak]

11.1.14. Paul, my (Industrial) Journeyman electrician I apprenticed under always said "Test, don't guess!" To your students, with classroom & field exposure, they will have all the confidence to trouble shoot any situation that comes their way! A methodical approach is the only way to tackle them. I'm with you, detective type work is the most rewarding, anyone can guess & swap parts. To prove the cause to the underlying problem is the only way to build knowledge. I'm not an auto tech but I enjoy watching your passion for the trade, makes me feel like my "hungry days" when I was in school!

[PicassoPete]

As far as I can see is that the vehicle’s computer only lets you see what the designers want you to see. There are electronic systems that inbuilt to ‘Keep You Running’ at all costs if possible. This is shown by the engine running without the crank sensor connected. The vehicle’s computer, in order to ‘Keep You Running/Going’ has searched its programming to obtain a signal from somewhere possibly constructing one from the cam sensor. These things I’ve seen on other cars that verifies my findings. Similar things are resistors in the ECU to let it know if a sensor or an item is connected or not. Great video Paul. On the flip side It’s frightening to realise that there are much deeper levels of programming that these designers have implemented that we are not privy to.. If there wasn’t these deeper levels of programming then the engine would have just NOT RUN and thus finding the disconnected crank sensor would have been easier. Great fun these detective series Paul. I wonder how many of us have bald spots on our heads with all the head scratching.. LoL. Regards Peter A.

[PineHollowAutoDiagnostics]

Another good one, Paul! That initial cold crank sounded really bad...do you think the cylinders were fuel-washed and initial compression was low? After getting the CKP signal trouble code,   a visual inspection of the connector would be a good starting point in the field, especially since it's very accessible.
At 23:19 looking at CKP and CMP rpms, the graphs and live readings are IDENTICAL...that screams "substituted value" for sure. 
Love the "live" recordings!

[ماجكموزجوني]

32:35 I remember on your 1st video of this car at 24:25 you started to find Cam Sensor and you pulled out to test the voltage. How did the dealer missed that cable unplugged and came out with CAMCHAIN FAULT is beyond belief. Well done you dug it out and finally got the bottom end. How do you do it? You just open our eyes. I'm not even a mechanic but I learn a lot from you. Thank you and keep going mate. Crowd funds to keep your channel up and running? I will definitely donate. You are just awesome. Thanks