Use Basic Tools To Quickly And Easily Diagnose Simple Automotive Electrical Circuits
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- Опубликовано: 5 авг 2020
- Automotive electrical circuit diagnosis isn't always simple but, approaching each issue with an efficient test method helps you reach the solution more efficiently. In this video, we share the process I use when diagnosing a simple electrical circuit. In this case, it happens to be testing for an inop blower motor. Enjoy!
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Nobody is breaking it down like you do... If you get an understanding of automotive electrical everything else will come... I really struggle with electrical...You got a Sub...
Wow, thank you so much!!!!!
Mike Becker, Senior Instructor
👍 the industry needs more techs like you!
Hahah thanks man!
Mike Becker, Senior Instructor
Loved the use of the diagram and walk through of what you were going to test and where you were putting the leads and showing us in the real world. That is how you teach. Outstanding. Your presentation and execution is perfect.
On a flat rate question. I was a gm tech so in that world many techs after find this same problem one time would probably go straight to that connector and wiggle it as a first step.
Keep doing what your doing!
WHY CAN'T WE HAVE MORE VIDEOS LIKE THIS ,, BEST TESTING I HAVE SEEN IN A WHILE THANK YOU MIKE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I hope you share more videos about wiring diagram.thank you
Hey Pablo, you enjoy lessons about how to read and use a wiring diagram?
Mike Becker, Senior Instructor
@@GoTechTraining I just found your channel today and have watched so your electrical wiring diagram videos. Have learned a lot and ready to take them into my work!
Nothing like old school testing 😌 🙌
Hey Paul,
If it works it works! Thanks for watching!
~Ryan
I've seen you on RUclips but never really bothered to just watch but after watching two videos consecutively I immediately subscribed. Love how you not only think but also convey that process
Excellent break down of your steps. You do a great job at a teaching valid points. "No parts required". Ivan would be proud.
Hahaha Wyatt, I love making Ivan proud! Thanks for watching.
Mike Becker, Senior Instructor
I knew someone would bring up Ivan, lol.
Watched all your videos on your road trip. A couple minor issues and a very happy dog at the end. Good stuff.
Another great job of a perfect diagnosis; keep up the good work. Happy motoring.
Hey Sam, thanks for watching!
Mike Becker, Senior Instructor
You're my hero. Im going through all of your learning diagrams and diagnosis videos. My v10 ford is running terribly. I know the timing is retarding with more throttle and or rpm and am confident ill figure it out. Im not asking for advice as I want use it as a learning tool. You're helping me fill in the last void I have in vehicles 🤘
Always good when I see a more simple method to solve a electrical issues. I always hear it from all you good guys, Powers and Grounds.
Always nice to see you Mike, thanks for sharing. Hope all is well down there.
Hey John, powers and grounds make the world go round ;) Thanks for watching. All is good here, hope the same for you!
Mike Becker, Senior Instructor
Great diagnostic process Mike. Thank you for sharing!
Thanks a ton Steve!
Mike Becker, Senior Instructor
Thank you Mike. Good job again. Have a blessed and safe week to you and your family.
Hey Billy, thanks! Same to you and your family :)
Mike Becker, Senior Instructor
Logic and patience will win the day. great vid, thks
So true Mr Fixit, so true!
Mike Becker, Senior Instructor
fantastic video, very well explained every step of the way! Thank you!
Great lesson and in depth explanation Mike!Cheers!
Thanks a lot Ismar!
Mike Becker, Senior Instructor
It's a scope...Scope on a rope! I recently helped a guy on the Honda Odyssey forums who had done all the same stuff....I guided him with some testing to a bad HVAC control head on a 2007 Odyssey. Had never seen it before on the Odyssey but the testing, if you know what you're doing, doesn't lie. He ordered a control head from eBay and a few days later posted that it was fixed! He was quite happy...although he also had a new transistor and blower motor from before I started helping him. Good stuff here!
Scope on a rope! Thanks for watching! They get harder the newer they are...module to module comm and such :(
Mike Becker, Senior Instructor
Great video on how to troubleshoot. Thanks for making this video. It's a simple and very efficient way of troubleshooting. Saves a lot of time.
Hey Bernardo, thanks for watching! Glad to hear you've enjoyed the video!
Mike Becker, Senior Instructor
Nice work Mike. 👍
Can't beat the basics.
Hey Abbott Automotive, thanks for watching! Some people need it, others may say they don't but are secretly watching ;)
Mike Becker, Senior Instructor
very educative. thank you .great teaching
Great videos. I like them a lot!
This is method I use to diagnose electrical faults.
I was taught to listen for a click on a relay circuit that controls all circuits (high and med and med and low). Also when diagnosing a fault on the circuit you are looking for one fault only (unless somebody has been trying to fix it and let things disconnected or broken) so we will eliminate lot of circuit
1/turn the knob/switch to any position, lets say high
2/listen for click of the relay, no click your problem is on control side of the relay (either bad relay, open/shorted + wire, open - wire, BCM switch internally broken)
if you hear a click your problem is on the switch side of the relay
3/at blower motor connected back probe pin 1 if you read 12 V you just eliminated bad + wire, open fuse if you read 0V check them
back probe pin 2 if you read 0V then you have a bad blower motor, if you read 12V, you have good motor. Your problem is on the ground side below pin 2. We can eliminate problem between S202 and resistor pin C also between S202 and pin E,F,G,H because we are only looking for one fault, any fault between these would not cause all setting not to work.
Our fault is either bad wire between blower motor pin 2 and S202 or heater switch of the HVAC control module or ground wire from module pin B to C201 to F to G106.
4/Checking at splice S202 is not easy so lets take our hvac module aka switch out and back probe pin E (thats our high setting), if you read 12V then between blower motor pin 2 and splice S202 we don't have any open, if you read 0V you have open wire in that location and you are now forced to check S202
5/ hvac module backprobe pin B if you read 0V you have bad switch, if you read 12V you have a good switch
6/C201 back probe pin A5 if you read 12 V no open on that wire, OV your open is between C201 and pin B.
7/back probe pin F 12V no open 0V open between pin F and C201
8/ G106 0V open between G106 and pin F
Hope this makes sense!
I'm so glad I found your channel. 👍
Thanks Speedstack21!!!
Mike Becker, Senior Instructor
OK I'm in love now...please make more more more more more!
"A relatively easy circuit..." but is it Mike? It's easy to guy's who understand it, but not so easy for those still trying to understand it...😉
You are on point Mike...looking forward to more good videos!
Hey Pauly's Auto, thanks! ;) You're right. That's a lot of why I am doing the wiring diagram series. Bringing those who are still trying to understand it along!
Mike Becker, Senior Instructor
Thanks Mike. I am trying to find out why my instrument cluster on my old Mercedes is active goofy and I suspect a wiring issue so I am just in the process of learning how to troubleshoot wiring so I can hopefully fix it this winter. Your videos and knowledge are helping me a lot.
Excellent structure, easy to follow!!
Thanks!!!!
Mike Becker, Senior Instructor
Bloody good video. Love the methodical approach!
Lance,
Glad you enjoyed the video!
Thanks for watching!
~Ryan Wilsing
I Always love to watch your videos. Wealth of knowledge and info here. Thanks and keep up this gr8 work.
Thanks a lot Usman!
Mike Becker, Senior Instructor
Thank you Mike. Very detailed explanation.
Hey Michael, thanks for watching!
Mike Becker, Senior Instructor
Great lesson Mike. Thanks!
Thanks!!!
Mike Becker, Senior Instructor
I always like to test at the load if possible. Great video Mike! 👍
Hey Nick, thanks for watching! Best place to check both sides of the circuit!
Mike Becker, Senior Instructor
You're a great teacher.
Thanks so much Rafael!
Mike Becker, Senior Instructor
Thanks for the education. Great job explaining it.
Hey Rich, thanks for watching!
Mike Becker, Senior Instructor
The best video on simple electric diag
Hey Mike, thanks man!
~Mike
Follow the voltage/current path. Along the way in this case, check the "G1xx" ground by substituting a "known good ground." Circuit now works, back track to locate problem. Sounds simple, and in this case, like you said, it is a fairly simple circuit. It's called "signal (or power) tracing."
It worked for me in the past. Intermittents are a different animal, but basics still are the rule to follow.
Good one Mike!
Hey Mike, thanks for watching! Ugh yeh, intermittents can be a bear to find!
Mike Becker, Senior Instructor
Awesome as Always Mike !!!!! Viewer for Life
Hey Chris, wow thanks!!!!
Mike Becker, Senior Instructor
Mike you are AWESOME thanks for sharing.
Hey J Georges, thanks :)
Mike Becker, Senior Instructor
Excellent! Mike, thanks again!
Hey Paul, thanks! :)
Mike Becker, Senior Instructor
thank you so much for sharing your knowledge to all of us!!! i would like to work as a technician, since i like challenges and there's no diagnostics mechanic in my town and i loose my job with the covid issue (i'm an artisan and make jewelry), but i don't have a shop nor tools to do so. at least i have fun watching great automotive channels. thank's from argentina!!!!!!
Hey Lautaro, hello from Wisconsin! Thanks for watching. Good luck trying to become a technician! :)
Mike Becker, Senior Instructor
Excellent lesson! Great Job
Hey Cstar, thanks for watching!
Mike Becker, Senior Instructor
Good stuff. Making it simple.
Thanks!!! :)
Mike Becker, Senior Instructor
Top man! Thank you
Very informative walkthrough
Another great one thanks
Another day another great class 👊🏻👍🏻
Thanks man!
~Mike
Excellent work
great video showing a simple way to solve a problem thanks
Hey Gonz, thanks for watching. Glad you enjoyed it :)
Mike Becker, Senior Instructor
Go Tech Mike Becker Good Afternoon take care and have a great day Mike Becker
Great tutorial thank you 👍
From Nick Ayivor from London England UK 🇬🇧
Thanks for watching!
Mike Becker, Senior Instructor
Very nice especially with the photos of actual components. Allows complete beginners to follow along and enjoy. Thanks
Hey Michael, thanks for watching! Glad you found it easy to follow :)
Mike Becker, Senior Instructor
Thank you Miguel for you time; I like this kind of videos because I trying to learn how read electric diagram . Sorry for my Inglish I'm doing the best. ( Dios te bendiga.) 👍
Hey William, thanks for watching! Stay tuned, I'll do a wiring diagram reading video at some point soon.
Mike Becker, Senior Instructor
@@GoTechTraining I wil . Thank
very very nice... thnks a lot sir
Just amazing. Great video
Thanks Jose!
Mike Becker, Senior Instructor
very useful, thanks Mike
Thanks for watching Reid!
~Mike
Another great video sir. Regards.
Thank you so much!
Mike Becker, Senior Instructor
Great diagnosis
Always go to the load i was taught.
Whether its a globe or motor etc
Hey Atiq, thanks for watching! Testing at the load is always a worthwhile test!
Mike Becker, Senior Instructor
Nice fancy Smartboard there, Mike! I'm way late to the party - finally got my new iMac all installed and functioning. Still trying to figure out how to merge user accounts. Nothing is ever easy with these magic boxes! But anyway, great explanation, and the Smartboard made it easy to follow along. Felt like ScannerDanner Premium. 👍😎
Hey Smitty, better late than never! Thanks for watching. I do enjoy using the smart board for that style of lesson. Flow smoothly.
Mike Becker, Senior Instructor
When you saw a problem on GND side, I thought you were going to go straight to G106 body GND, but I guess that would be the equivalent to testing the fuse first. Must start at load and work your way out. Very good lesson even for a DYIer.
I'm glad you were able to follow my logic on this one! Loving your comments so far :)
Mike Becker, Senior Instructor
excellent video thank you
Hey Annie, thank you for watching!
Mike Becker, Senior Instructor
Best videos out there...
Thanks Mike!
Mike Becker, Senior Instructor
thank you for your video's.......would love you to do a series on analyzing ignition waveforms.......
Hey Carl, I'll see what I can do!
Mike Becker, Senior Instructor
That's good stuff my brother you got it man
Hey Antwon, thanks a ton!
Mike Becker, Senior Instructor
Fantastic video.
Thanks Russiansupapowa!
Mike Becker, Senior Instructor
#1 Check the easy things first
#2 Don't assume anything
#3 Never take anyone else word for it
#4 Check everything else in order of increasing degree of difficulty.
#5 never condemn a part without proving it.
Useful info i obtained many years ago as a tech. When someone has failed to fix an issue the reason they failed can be associated with one or more of these rules.
This is incredible. :)
Hey Filip, thanks for watching!
Mike Becker, Senior Instructor
Thank you for teaching us🙏👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍✌✌✌✌✌
Heyyy Salvador, thanks for watching!!!! :)
Mike Becker, Senior Instructor
Wow thank you on the 2 are in the vehicle and 1 are under hood !
Thats the right way of troubleshooting which is by ellimination. Test the load side first, then squeeze it down to the faulty component. Some inexperience technician are jumping from one place to the other instead of following the trail. Most common issue on electrics are corrosion, either at the connectors or inside the wires itself, especially when other technicians used an insulation peircing clamps.
Thanks for watching Bogart Bacus! Ahh yes, good ole corrosion :)
Mike Becker, Senior Instructor
Good video, Thanks. I'm guilty of checking the easy to get to stuff first.
There's nothing wrong with that Russel!
Mike Becker, Senior Instructor
Thank you
Hey Mike. Always great to see your videos. I agree with others that some wiring diagram understanding videos would benefit so many including myself. And also knowing what to expect at any given point in the circuit. For example at your blower motor, if you had 12v at both wires while still plugged in, you would also know there is no ground and that the 12v passes thru the coil in the motor and on through the rest of the ground side circuit. Question, before you fixed the block, with the blower switch turned on, would you have read 12v at the ground block? I'm sure you would have on that particular wire anyways. Keep up the great work Mike. Stay safe!!!!
Ohhh Mike that's a good idea. I can make that happen! Yes, it would have read 12v at that block, as long as the switch was turned on for the blower motor.
Mike Becker, Senior Instructor
Would that confuse anyone with a test light clipped on at the ground block bolt and lighting up the test light touching the blower ground wire. Lol. It would make me think for a second or two. But why would anyone put a test light there.
YOUR SO GREAT VERY EXCELLENT SIR.
Thanks a ton Oto!
Mike Becker, Senior Instructor
@@GoTechTraining how to add you on fb sir
I found you and liked your page.
Mike Becker, Senior Instructor
@@GoTechTraining TY VERY MUCH SIR MIKE YOUR THE BEST EVER ABOUT ELECTRICAL DIAGRAM AND TROUBLESHOOT AND DIAGNOSING.
Useful as always. Why do you use insulating (dielectric)grease when you want good electrical connection?
Nice!
Hey Trey, thanks for watching!
Mike Becker, Senior Instructor
thx for doing the whole diagram
Thanks for watching :)
Mike Becker, Senior Instructor
Good info
Hey Nigel, thanks!
Mike Becker, Senior Instructor
Siempre tengo la esperanza que vuelvan a entregar videos en Castellano...
Por último los subtitulos en éste idioma....gracias
FYI, check a product line call Corrosion X. They work great to avoid this kind of problems.
Will do, thanks!!
Mike Becker, Senior Instructor
Would like to see you do a video on explaining what all the letters and numbers and dots and lines mean on the diagram there are still a lot of us out there but don't understand how to read a diagram properly
That sounds good William, I'll make it happen :)
Mike Becker, Senior Instructor
just remember that there is no standard per se. each manufacturer will do things a bit different. a good diagram will contain a legend just like a map explaining what the nomenclature means
Thanks awesome vid, about the dielectric grease, know thats recommended but I do have a tiny bit of confusion on that, when looking at the tube of it doesn't have any conductive properties, does this mean the pin cleans the grease off on the way in to make a good contact in the terminal? and the grease just stops water ingress into the connection?
Hey thanks! Yes, the grease is intended to keep any stuff out of there.
Really good video, very straightforward and informative!
Quick question:
What do you use to locate specific connectors on the vehicle? If I'm using alldata can I just search "G106" and get a picture with the location? Or is there something better for that sort of thing? In this instance its not a huge deal but say I'm looking for a specific splice in the harness, I don't want to go tearing the whole dash apart looking for it!
Hey ApostleXIII, thanks for watching! Yes, you can search locations in Alldata, but typically I just use the location finder on the right side of the page. It lists them all out in numerical order and I just pick the one I'm looking for. Sometimes the picture you end up with that points to the location isn't the greatest...but it gets you going in the right direction.
Mike Becker, Senior Instructor
@@GoTechTraining Thanks Mike!
Just amazing bro, do you have more of these diagnosing videos?
Hey Carlo, I have a ton of videos...what are you looking for specifically?
Mike Becker, Senior Instructor
@@GoTechTraining diagnosing using electrical diagram
Just to quickly know the problem is on the ground side of the circuit. Yes, you are correct.
True that Zarik!
Mike Becker, Senior Instructor
thanks
Thanks for watching Dan!
Mike Becker, Senior Instructor
You could also move the test light connector to the battery positive terminal and see lights up to quickly know have a bad ground before taking HVAC module apart.
Hey Zairk, sure buy you'd still need to access some point of testing. The likelyhood of the ground splice pack being back is so low that typically it doesn't make sense to test there usually.
Mike Becker, Senior Instructor
I seen where grounding points are some times cover w/ liquid electrical tape is this a good thing especially in the rust belt???
Sure, that's never a bad idea!
Mike Becker, Senior Instructor
Hi Mike. I’m curious as to the liberal use of dielectric grease on the actual terminals of the connector. I understand that the intention here is to prevent corrosion in this instance. By definition a dielectric is an insulator and therefore presumably not desirable to get on conducting surfaces. In your experience does the application of grease produce any appreciable increase in resistance?
Hey DJR, thanks for watching! No, I have never seen adverse effects to the dielectric grease. The pins, male to female, make a physical connection. Therefore, the dielectric grease is a non-factor at those connection points. The goal is to fill the other space with the grease so water/air can't get to it and cause corrosion.
Mike Becker, Senior Instructor
🙏🙏🙏🙏🙏👉👍👍👍👍 tanks brother
Thanks for watching!
Mike Becker, Senior Instructor
👍👍👍
👍👍
Hey Richard, thanks for watching!
Mike Becker, Senior Instructor
Me gustaria que lo diet as en español grasias pro su aportasion a todos Los youtubers
Its a shame the electrical diagrams aren't free and always expensive to subscribe to. But the video is excellent as always
Do you use an automotive circuit tester? What do you recommend? Power Probe? autel?
Hey Histqrry, I use a test light, DVOM and labscope. No PowerProbes or anything here.
Mike Becker, Senior Instructor
With the dielectric grease. When would you say it is okay to use.
Being it is a dielectric. For instance I've had some issues where cars would have had dielectric grease put on computer module connectors causing comm issues.
Is their a certain level of comfortably using grease on higher load circuits?
Hey Nick, this is a great question that everyone seems to have differing opinions on. A quality dielectric grease should never cause issues, it's just there to take up the air...not letting moisture in. It should never conduct electricity, therefore never cause issues. Personally, I've never fixed a car by removing dielectric grease. Hope that helps a bit?
Mike Becker, Senior Instructor
@@GoTechTraining cool, appreciate the response... makes me think weather or not it was dielectric grease the two modules I came across. Idk but thanks for the insight
@GOTECH How in the world do you break loose the harmonic balancer bolt on 3.5L inline 5 on a 2005 chevrolet colorado. Tried using the flywheel lock that alldata specified but the transmission bell housing case won't allow the tool to be inserted. Any suggestions?
Hello,
You could try and get a hold of a harmonic balancer holding tool like the J 38122-A or something like it. It looks like the balancer has a design where you could hold the balancer itself. Otherwise an impact wrench if you can fit it down there.
Hope this helps!
~Ryan
@@GoTechTraining Definitely helpful. Thanks for the information!
If you don't mind, maybe you talk about your jumper wire in a future lesson? I thought you said "fuse jumper" but I see it's a "fused jumper" with a 20A fuse inline. Is that just so you don't blow a fuse in the box or damage another component? -- I'm new here :)
Hey, sure I can talk about that at some point! It is fused to protect the circuit...and the fuse in the box ;) I'll usually try to throw a fuse slightly smaller than the one in the box into my jumper.
Mike Becker, Senior Instructor
zero thumbs down keep it up
Hey Khasem, let's hope it stays that way! :)
Mike Becker, Senior Instructor
Where do you get your wiring diagrams from? Do you need to pay for a subscription or is it free and accurate?
Hey Jerry, I have subscriptions to both Alldata and Identifix. They do both cost quite a bit. I really haven't found a super reliable place that offers them free.
Mike Becker, Senior Instructor
Is there possibility u can damage pcm using this technique
Hi GO Tech I need help on 2008 lexus IS250 climate control issue.
Hey Beacon Sharman, sure, what's going on with it?
Mike Becker, Senior Instructor
Isn't there a risky chance to damage computer with old style Test lamp, because old lamp can flow higher current ? Then there are new style of Test lamp with LED, which not draw too much current.
Hey GameBacardi, the simple answer is yes, in some circuits. You would not want to plug the test light into a signal circuit or a reference voltage circuit or something like that. My rule of thumb is to always look at the load in the circuit....if it draws more than .5 amps, I'm throwing an old-school test light on it...if it's less, than a DVOM, LED test light, or scope are going to be used.
Mike Becker, Senior Instructor
how we can get this kind of wiring diagrams
Hey Samer Saad, most of these wiring diagrams are all paid for via a subscription service.
Mike Becker, Senior Instructor