Just some fundamental knowledge my friend. This 5v ref. circuit is the same on every car. Thanks!

@scientist100

3 жыл бұрын

I've heard you say there are cars with 8volt reference signals. Is this correct? Maybe I'm remembering pull down or up designs. Thank you for the great content.

@ScannerDanner

3 жыл бұрын

@@scientist100 yes sir, Chrysler systems from the 80s through the late 90s used a 8-9v reference for the cam, crank and vss inputs circuits, while using a separate 5v ref for the rest of the inputs

Been working on my own stuff for 50 years. Way back before all this complicated stuff. Always looked for obvious first, cracked disconnected hoses and broken wires, burnt wires, chafing wires. Blown fuses, open circuits. All we had were test lights and a multimeter. Now that we have cars on the computers and can bus system it has gone way complicated, but thanks to guys like you us do it yourself types can figure it out again. Back in the day I hung out in the local garage and watched. That is no longer really possible anymore. Thanks to youtube you can hang around thousands of garages.

9 yrs later.. and im amazed how u do ur stuff.. a friend use to call me a jedi when i would fix his pc.. gotta pass it on....jedi👍

I'm addicted to these videos just getting the hang of 5v references unplugging and reconnecting sensors I've ordered a snap on d8 triton was a trade in so got a deal on it now I'm going to start practicing using a scope and values still got a long way to go yet as I'm just starting but your videos are priceless

@ScannerDanner

7 ай бұрын

Thank you! When you're ready, join my classes I offer via my website. I have over 400 hours of training material, from classroom lessons recorded at the technical college i teach at, to exclusive case studies. Hope to see you there! www.scannerdanner.com/join-scannerdanner-premium.html

Love your videos. Just had to help another tech in my shop after he did an engine swap. Had exactly the same symptoms. He tried swapping the coil, crank and cam sensor from the old engine before I stepped in. After checking crank signal and not finding it, checked 5v reference and did not have one. Computer not so easy to back probe so started unplugging sensors. Found that in the rush of putting the engine back in, he had plugged the cam sensor connector into the coil. Unplugged the coil while watching the 5v reference, boom, 5v now. Easy fix but shows how easy it is to over look something so simple.

@turtlezed

3 жыл бұрын

I see this was 6 years ago but I am about to go and troubleshoot that exact scenario this weekend and your comment is more useful than you realise, I think you may have already cracked it for me.....I am already on a good path with this one, thanks for the 5volt input dude 😉 👍

@jonwally2002

3 жыл бұрын

@@turtlezed you’re welcome, hope you are successful

scanner danner best teacher on youtube about car electronic ,briliant teacher.

I can't thank you enough for all your wisdom and generosity with it. It sounds crazy but a completed circuit can be applied to just about anything in life.

Congratulations on your 2 years on KZread ScannerDanner. i've been following you since the RX300 misfire video and been learning something new ever since. Thanks to you (your E-book, case studies, and video lectures) i've been able to fix vehicles that the "Lead Techs" haven't been able to fix. THANK YOU!...

After spending a lot of time checking rechecking and re rechecking thinking I missed something, I come across this video that makes sense and is put in simple to understand terms. This procedure makes testing simple and quick. Thank you.

Would never have thought a shorted sensor could cause that. You guys are awesome.

Lord of the 5V Reference Circuits. Good lesson.

Thank you Jonas! and may God bless your mind as you continue to learn in this great field.

I'm happy that you enjoy your job very very well and share your knowledge to the technicians who wish they had their co-workers as friendly as you are to help them. I must thank you for 1.) Selling your ebook to me in a printed form 2.) For being a teacher/instructor for all technicians who seek valuable information and testing procedures that you offer us. I greatly appreciate it. Thank you.

what a compliment. thank you very much for all your support!

you are very welcome, and thank you for the comment

I saw this one when it dropped and again now. Still an awesome watch.

Thank you for being clear and concise in your videos. You may have just helped me figure out where to look next.

Excellent video. I had a shorted TCM pulling down all com on a Mercedes I bought. You're doing a terrific job enlightening others. Thanks!

As i research and troubleshoot my Element I am starting to think that mechanics are more electricians than mechanical specialists when dealing with cars. Thanks! Your videos are great and totally make sense to a rookie under the hood.

YEp ... great job and very good troubleshooting approach ... I used to do this sort of thing on a brd level at an electronics mfger where we have a test jig for a pcb and it tells us what test fails and then we find that area on the schematic and proceed from there. Golden rule of ANY electronics TSing is power supply power supply power supply ! As you were saying most electronics today are protected from short circuit and over current as well so it makes it pretty easy to track down these sorts of issue. Well done Danner

Great instructional video as usual Paul! You are a diagnostic genius to say the least! All your videos are so helpful and chalked full of intuition and accurate persistence! I cant thank you enough! You teaching skills are both top shelf and down to earth. independent thinker inside and out the box. A++++++++++++

Very informative, excellent videos, explained well. Nice to not just hear how you do something but why you do it. Also like to see you fast forwarding in areas where it's obvious to do so because of repeated testing of certain components. Your an excellent teacher, look forward to more videos and will definitely take your advice and suggestions of tools and services available that you support that could help me become a better mechanic.

Thank you very much for that write up (video). It was very informative and very helpful in regards to "no start" issues.

Great case study as usual. Thank you very much. I love learning and being stepped through your thought process.

Hey Paul if one day you decide to come teach in New York I will definitely be one of your students. Thanks for really teaching how to fix a problem NOT change parts. By watching your videos i decided to buy a Snap on verus pro and now feel like one of your students learning how to use and fix problems with you. Thank you very very much man. May God always keep giving you more and more understanding on how to fix and teach people.

Paul i believe God all mighty send you to earth so you can teach us this a gift.thank you sir.

I've seen a lot of troubleshooting videos on here this is by far the best.Your students are lucky .THANK YOU!

@ScannerDanner

2 жыл бұрын

Thank you!

i am flattered, thank you. But i am nowhere near that mans level. He is so good at what he does. I have so much respect for him. Any class John Thornton is teaching is one that I am signing up for.

I have watched 1000's of videos from various authors around the world from UK, Australia etc , spend around 3000 dollar bought lot of dvd (trust me) so far, but ur ebook I bought costed just 30 dollar(not sure how much it is now) and I value that book then those 3000 dollar dvd's... u are the best so far. you know why because u are honest and humble. if the other author have this kind of knowledge like u have they would have sold for million dollar, u are a million dollar guy,

Man what an amazing video. I learned a lot about the importance of good reference voltage and how sensors can be interconnected. Thank you. You are awesome.

I agree with manny mr.danner we realy appreciate you sharing your thought process! Unfortunately in the field most other technicians don't want to teach what they know because they don't want you to start getting more of that work. I rely heavily on my youtube teachers to progress in this field. Thank you very very much

the best teacher in the world.you are brilliant sir

Omg this is by far my favorite video this is the stuff that will drive you crazy and you systematically took it on step by step

A superb logical approach. Another fault finding gem. Thanks for posting this.

Thank Paul for explaining the 5 v reg great job man thank you sir.

Well done.So amazing to look at you and going stepby step and that referenced 5 volts is awesome.

@ScannerDanner

Жыл бұрын

Thank you!

been watching your videos,but this is the first time I write,thank you for all your videos, and this one is one of the best.

This is the kind of issue that would have this vehicle jumping from shop to shop with dozens of parts thrown at it..Very few techs would have figured this one out. You're just that damn good man!!

Excellent, definitely the best learning resource on the web.

for sure it seems like it would be a great addition to the diagnostic tool box for that type of testing.

Excellent. Paul. Love the direction

That is an awesome diagnostic video for someone who is not quite familiar with this situation. But early on in the video I could have told you that the plugs for the map and tps were mismatched. Happens most the time when someone is not careful in their engine swap and hooks them up wrong because they both use the same exact plug.

This is one of my favorite videos really enjoyed this one!!

Another great video. Long time subscriber, and what you prove is that it doesn't matter what car you are working on, you dont need to be experienced with every single car out there, the concepts are fairly identical and therefore so can the troubleshooting. It almost makes me want to purposely create the faults you find, so that I can do the same tests to prove it. My luck though, I'd have the PCM without the "safety" circuitry to handle a short and would blow the PCM, lol.

Hey Paul great test, i agree checking for voltage references from pcm when you dont have communication the first step, test is to verify what the pcm need to supply, which is voltage 5v references ,totally agree,, thanks for sharing

Bravo, that is troubleshooting on another level. Great lesson.

Great case study Paul. We sure have to pay attention on those shared 5V references even if they coming from two separate pins in computer.

Thanks for the great job of making us great technicians

So glad I found your vid ! Changed engine in an altima and same woes. The maf is the only thing I haven't unplugged trying to start w/ no spark. Hope it does it. Thanks.

this is another great video always some thing to learn, good lesson Paul thank you . the best teacher I ever seen. your book is amazing

Hey Paul, Great video you have convinced me to buy your book, all the best from the UK.

I wish we had Mitchell on demand wiring diagrams in the uk! Great video by a great teacher!

My best lecturer. Always wish i knew you earlier. Am learning alot. Thanks.

@ScannerDanner

3 жыл бұрын

Love this comment. Thank you

Wow this is so sweet you are so good in what you do i keep looking at this video over an over very nice.

You do t he most amazing videos. I learn so much from you. You are one of the few teachers who explains things in a way I get it. You have helped me further my career so so much. Thanks Paul ! My biggest downfall is no communication. Could you do a video on that with a can bus vehicle where a module takes down the network plz? I don't under stand how to figure out which mod i/ node is taking down. He net. Thanks for all you do. You are an amazing tech and teach! Keep up the work

Thank you, sir. Really helpful. Great lesson

I have a friend with an 05 Dodge Ram 1500 van who is having a similar issue as what you had going on here. It's an intermittent crank but no start, and "no bus" clearly indicated on the cluster, and no data link while this happens. This weekend we will be looking it over. He assumed possibly a bad crank angle sensor, I told him to watch this video since something is possibly grounding out the reference circuit.

@MrOscar442cutlass

6 жыл бұрын

Probabky bad ecm

why should you check for a good 5v Reference? Remember, the 5v-ref. circuit is an output signal from the module used for diagnostic purposes/feedback on wiring integrity. If this is not present, this indicates that the module is not awake. I've seen 7v-ref circuits, 10v-ref circuits etc, but 5volt reference circuits are the most common amongst vehicles, at least from my experience. Awesome video, I thoroughly enjoyed it

Fantastic video! Use this info all the time.

what an excellent video, extremely good information for going after a no start .

@ScannerDanner

7 жыл бұрын

Thanks John

@tnamen1307

4 жыл бұрын

@@ScannerDanner one confusion....the 5 v reference signal is shared to all sensors. Now, if the 5v signal to MAF is shorted, why the engine can start with the MAF sensor unplugged?? Is not that the ECM will not provide any signal to other sensors too? Please kindly brief clarify. Thanks.

@ScannerDanner

4 жыл бұрын

@@tnamen1307 key word "signal", a 5v signal wire on a digital MAF like on a GM, is a pull-down type of circuit. The computer sends 5v to the MAF and the MAF pulls it down to create a digital square wave pattern. This is NOT the 5v reference circuit. Yes, it is tapped into the 5v ref inside of the engine computer, but it is isolated by a current limiting resistor. In short, a 5v signal wire is totally different than a 5v reference wire. Hope that answered your question.

@tnamen1307

4 жыл бұрын

@@ScannerDanner that means, if any sensor or wire sharing a 5 v reference circuit or wire is shorted, then all the respective sensors will not work. Is this my understanding correct??

@tnamen1307

4 жыл бұрын

@@ScannerDanner and, another question relating to ac compressor. My car i20 engine is running very quiet as usual. However, as soon as AC clutch is engaged, I hear a squeak sounds and not metallic sounds or alike. The squeezing like sounds go away immediately as AC is off. Even with engine revs, same sounds. And with AC off, as I revs the engine, still the engine is quiet. How to find that squeaky like sounds and fix it? The AC is blowing cold. It seems the AC compressor is ok.

excellent video paul i think between just these last 2 videos/ they cover all steps approaching any no-start condition.

thank you, this info was a huge help...the sensor did knock off my check ingine light and no start condition... anyway, all is good now..the computer was getting very hot during all my checking but now the fuel relay is malfunctioning and will not start normally... but it will start if I supply voltage to fuel pump... anyway, Ill look at it tomorrow.. thanks again..your awesome.

Luv theses type of case studies, great for dirrection base.. GURU!!!

omg ..so much to learn from you...and this video have 10 years

@ScannerDanner

10 ай бұрын

Still just as relevant today my friend. Thank you!

very good testing procedure diagnostic flow chart.thankyou for sharing we always learn somethign from you....

Paul danner is the greatest teacher in the u tube there is no point putting tumb down... Mabe those who put their tumb down are those who don't understand or jelouse of his brilliance... Next time if you don't like his teaching you may fuck off without any comments I learned a lot from you Paul thank you ...CLIVE from Malaysia...

@ScannerDanner

5 жыл бұрын

lol thanks man

another really good video. spot on with the method paul. learn along with danner is better than factory training.

Killer! That was awesome, thank you for the demonstration.

Great job of troubleshooting.

Thanks for the awesome video and information! It really does help to get things fixed faster, mechanics are starting to hate me :D

very good presentation on ref. voltage,and seeing if computer is alive.

@danielm.8301

9 жыл бұрын

I I

Great case study,., thanks Paul,.,.

60 ur. Old man and I love to work on cars engines .I always avoided eiectrial repair or troubleshoot but now I've so much off of his videos he makes it look. Easy and interesting scanner Danner day shit!!

Another great video thanks again Dan Mark

Some great great stuff you got there Thank you

I notice that the odometer reads 141,693 miles even though the engine was swapped out. Could that be a sign of the computer not being able to communicate with the engine? Every time you solve the issue I'm simply blown away. Thank you for the work you do and the effort you put behind these case studies.

Good Evening Sir ScannerDanner take care and have a great day Sir ScannerDanner Thank you tutorial great 👍 👌 From Nick Ayivor from London England UK 🇬🇧

I love the credits at the end...starring: a shorted map sensor 🙂

Another simple video that is understood

I learned so much from this video.Thank you

@ScannerDanner

9 жыл бұрын

+martinguitarhd28 thank you! I have so many more. Thanks for watching

Thank you! very good,very instructive video

Sanner D you are the man thank you.

thank you i have been working on a 2006 subaru wrx no power to the pcm no power to fuel pump no power to injectors and i just went in to work and unpluged the maf and it started right up thank you

I'm not but thank you Hector! You made my evening.

Awesum videos you make and yes I spell awesome differently than most people. I have my own reasons for doing it. Some = a few Sum = total. Awesum total amazement. Seems logical to me. Really liked your video, thank you for your time and what a gift to share with us.

Amazing how sensitive the computer is missing just a few volts which can cause big problems. Great vid once again, thanks!

Excellent video. Thanks.

May God always bless you sir thank you.

Gracias, gracias, gracias!!! Straight to the point, and clear as daylight explaning. ✌😎 New sub. Stay 💪. Thank you very much.

@ScannerDanner

2 жыл бұрын

Thank you so much! And welcome to my channel

thank for teatch us realy you do very good job .i learn from you to much and steel more thank you

Awesome video actually all your videos are awesome - I'm experiencing similar symptoms and after watching this I'm fairly convinced and hopeful that my issue will be the same. I've already gone through the ignition coil module OPTi spark you name it thank you

@ScannerDanner

8 жыл бұрын

+Kevin cool. Let me know if you fix it

@Altermyego-

8 жыл бұрын

+ScannerDanner Thank you so much for your reply... You're truly an amazing technician and a selfless person to share your knowledge and experience, especially at the level of educating others for free. • on my 94 Z28 5.7 L, i took it to an (alleged ASE tech) to work on my vehicle, which I literally never do ever. ( in lieu of my depression & severe anxiety disorder) - "intermittent stalls and no starts" The asshole - "oh, its the opti- $900. Immediately after leaving the shop I go to the car wash & when I try to start the car after washing it, crank no start! "exact same symptoms as when I took it to him. I'm so fucking angry I cant figure out how I'm going to handle this. I did call him right after it wouldn't start of course he didn't answer, it was 20 minutes till close -voicemail: me: " I'm leaving my car up there exact same symptoms"...

awesome work . you are amazing

very good video amigo paul

Once again dan the Man....super Awsome Knowledge...Almost Master YODA Status...Great stufff Keep the Knowledge a coming...Thanks U a Bunch...U dont Even know how much u just helped me out...Dan the Man!!!

@InsideOfMyOwnMind

6 жыл бұрын

"There is no try. There is only do."

excellent instractor

parabens pelos videos , muito bom!!!

I have not. I have seen the tool and it is pretty neat. I prefer loaded circuit voltage drop testing myself. I understand there is a need to unplug a circuit to test it at times and this tool could be handy for that.

"It isn't just like a regular 5 volt regulator that you buy from radio shack and you short it to ground and you kill it" - The LM7805 has short circuit, overload and thermal protection built in.

Great case study 👍

@ScannerDanner

7 жыл бұрын

Thanks Steve!

Well done Sir.