Wiring Diagrams - Read Wire Color / Connector Pin Location + Learn How To Read What ISN'T Written
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- เผยแพร่เมื่อ 16 ก.ย. 2020
- In part 2 of the wiring diagram series we answer a few questions that we had from part one, talk wire colors and pin locations, and get into a diagram that has some blank spots. By the end of this lesson, you'll be able to apply logic to a diagram to fill in the missing puzzle pieces. Enjoy!
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Tech B is correct. There is continuity from the voltage source, through the primary winding, all the way to the end of the wire designated as terminal 50.
Hey France, that's right. Well said!
Mike Becker, Senior Instructor
Right ... and to continue that train of thought ... the switched ground happens inside the PCM, so the switched power will go all the way to the component (most likely a mosfet which switches the ground on & off) on the PCM circuit board that connects to pin 50...??
You're a great instructor Mike. You explain it well and on a level we can all understand. Looking forward to part 3. My electrical knowledge level pretty much ends with the end of this video. I can only go up from here. Thanks for taking the time to put these presentations together for all of us viewers. They are fantastic.
Awww thanks Mike! I hope to get Part 3 out in the next few weeks. Stay tuned, and stay warm...winter is coming :(
Mike Becker, Senior Instructor
The batt. is 12.6 volts,>voltage drop is = to .3 volts> which leaves a remainder of 12.3 volts after the coil near the pcm> the vehicle is in the run position, supplying power to the #3 coil> the pcm has not supplied ground. had the pcm supplied ground the voltage would have read a near zero to the least. I haven't seen the specs for the other coils, nor have I done a comparison between each coil, yet I know the coil acts as a resister causing a voltage drop of .3 volts. This in my opinion is normal circuit behavior. I replied too late to get my shirt... but nice video bretheren... I shall continue to follow your excellent videos!!!
Hey, great explanation! Totally would have won you a shirt if the contest was still going on. Thanks for watching!
~Mike
👍
@@GoTechTrainingplease teach me your ways electrical is so confusing 😢
Wait a sec, I don't know, so i'm not trying to correct you or anything, I just want to know... Is he right that the .3 volts can be used up by the coil without the pcm supplying ground? Because I thought without ground there is no flow of current, and therefor no voltage drop can happen, and that 12.3 volts must just be source voltage
Thank you SO much for doing these videos. I have been so lost on this stuff for nearly 50 years and you are helping me to finally understand it. Thank you
Hey Randy, thanks for watching! Stay tuned for more!
Mike Becker, Senior Instructor
Mike, I applaud you. Many youtubers fail to give the basics. Admittedly I waited until I got really bored and decided to watch your wiring video #2 as I feel I pretty much "got it" but i have several techs working for me that surprisingly can not answer your simple question.
I guess I assume techs should know the basics but alas, they missed something in the past and have managed to fumble through basic schematics.
In my next class on basic electricity I will spend more time on schematics and pose good questions like you asked.
Oh, BTW, I'm one of those old guys that knows very well that you can burn up a coil if the points are closed and ignition is on. As a matter of fact I own one of those old vehicles and enjoy gapping the points!
Keep up the good work!
Hey Emmett, thanks for watching! I feel TH-cam is a perfect platform for the basics. No one has to admit they don't know it and feel embarrassed. They can learn in the comfort of their own home without being judged for knowledge people assume they should have. I believe this is why the "basic classes" rarely fill up at training events...people are embarrassed to admit they don't know it. Anyways...a points car huh? Didn't think there were any left! Haha!
Mike Becker, Senior Instructor
No big deal Mike! You are very intelligent. I am 50 and you are teaching me new things all the time! I am sure your family is very proud of you! Keep up the great work!!
Hey Robert, thanks for watching! :)
Mike Becker, Senior Instructor
Thank you Mike. I appreciate you producing this series!
Hey Steve, thanks for watching! Glad to hear you're enjoying it.
Mike Becker, Senior Instructor
Thank you so much Mike, I am preparing for a Mechanical II test and I feel as if looking at all of your videos are really helpful.
So glad I came across this Channel !!! I enjoy watching these Videos , always nice to Refresh my memory, or get a Different perspective from another Technician !!!! I grew up in the Points Era , and Porcelain Resistor on the Firewall of Fords !!!
Hey Chris, thanks for watching! :)
Mike Becker, Senior Instructor
This is shaping up to be a great series. There's a lot of information to learn, and I have to watch each video many times, but I've learnt things that have completely baffled me before. Thank you.
Hey Labrador McGraw, thanks a ton! That's the best part of TH-cam. You can watch and rewatch as many times as needed!
Mike Becker, Senior Instructor
Looking forward for upcoming videos on this series,
Content of videos and your explaination are spot on , thanks for your support
Mike - great video. Extremely helpful. I've had the opportunity to take other automotive classes and have found your teaching / explanation approach to be the best. Please keep the videos coming. And, hope you plan on continuing on the electrical diagnostic path onto more complicated situations.
Hey Frank, thanks!!!! That really means a lot. I am, stay tuned!
Mike Becker, Senior Instructor
Thanks so much for this. Very easy to follow. Great job.
Great video Mike. Thanks for answering the question at the beginning.
thank you for such detail, up to date, extensive knowledge beyond what I have seen.
greatest words of appreciation for such dedications. have a wonderful day.
Wow, thanks for the kinds words Sam!
Mike Becker, Senior Instructor
These are the best teaching wiring diagrams videos on TH-cam so far!!! Understanding diagrams have always been my struggling point, these videos are starting to open up my understanding, please keep them coming!!! One awesome thing I learned is that when reading a diagram and looking at wire colors the first word is the wire color and the second is the stripe, WOW this sure makes things a little easier! Lol
Hey Shawn, WOW, thanks a ton! That's amazing to hear they are getting you where you need to go! Enjoy the series, don't hesitate to reach out if you have any questions.
Mike Becker, Senior Instructor
Thank Mike for the video I'm learning a lot. I'm Ready for the next one..👍💯
Hey William, thanks for watching! That's great to hear! Stay tuned :)
Mike Becker, Senior Instructor
Keep this kind of video dropping! I enjoy it!
Will do Glenn, stay tuned! :)
Mike Becker, Senior Instructor
Been waiting for this awesome job again!!! Can’t wait for part 3
Hey, thanks a ton! Stay tuned :)
Mike Becker, Senior Instructor
I am an aspiring technician and I've learned a lot from you Sir..u guys are the ones who help us build our future career..really appreciate it Mike😁👍
Hey M. Faizan, thank you very much! Good luck on your journey.
Mike Becker, Senior Instructor
Appreciate what you guys do , thanks for this great content 👍🏽🙏🏽
Hey Ramon, thanks for watching!
Mike Becker, Senior Instructor
Once again thanks for all that you teach !
Thanks for watching Juan!
Mike Becker, Senior Instructor
Great job master Mike, thanks for helped with your knowledge and work.
Thanks Felipe!!!
Mike Becker, Senior Instructor
MY name is Bill I have enjoyed your videos as a long time automotive tech myself these are great instructionals for my kids I mentor at my Dealership. I did notice Aprox 7 mins in and 10 mins in you were skipping connector 1450 a Black wire coming up from ground G201 and although not having an "x" its still a connector to ground and the horn switch as well. Just wanted to let you know i observed that. Keep more electrical based videos coming there so important these days for Techs to have a solid base and growing knowledge of. Your great at presenting as well!!
Mike is a great teacher! 👍
Hey Nick, thanks man!
Mike Becker, Senior Instructor
Thanks for the informative videos. In a past video, the fundamental building blocks of circuits were stated as including a voltage source, a load, a control device, a circuit protection device, a complete return path to ground and so on. Do circuits involving controller modules providing the voltage source (5V ref) also have circuit protection devices?
For example, an Inlet Air Temperature (IAT) circuit diagram may just show the IAT sensor with a power and ground wire connecting the sensor to the Control Module. In this case, can we assume there is a circuit protection device inside the Control Module (a diode maybe?) and it's just not shown on the wiring diagram?
Great presentation as always, thanks Mike
Thanks William!!!
Mike Becker, Senior Instructor
Again great tutorial, thank you very much
New lesson teacher. Im join here 30mins later. Your so a great teacher. Keep it up sir.
Thanks Oto!
Mike Becker, Senior Instructor
It is a great way of learning! Thumps!!!up!!!
Great video and thanks for addressing my question.
Watching this video made me feel like I was taking a class in a classroom, that I had to pay for. Thanks so much for sharing your knowledge so we can have the skills to make good diagnosis.
Another thing I might add because I like to talk a lot LOL LOL. Is that I am 51 years old and I have been working on automotive and electrical automotive for many many years. I am a professional technician and I still watch videos and take classes anytime I get a chance because I’m open minded. I know that even if I know something I don’t know everything! I will listen to anyone older than me younger than me I don’t let Age get in the way! Because just because somebody’s younger than you doesn’t mean they don’t know something you don’t! This is got me far in life for sure!!!!
What an amazing way to keep learning. Thank you very much sir.
Hey, thanks a ton! :)
Mike Becker, Senior Instructor
Hi Mike, First of all your video content, presentation, your pronunciation, your expression, your appropriate word and sentence used on explanations are very good. thanks for your video. please continue the same.
Hey Selvam G, thanks for watching! Funny you say that, sometimes I feel like i'm just babbling to the camera ;)
Mike Becker, Senior Instructor
great part 2 Mike! One thing I thought I could add to this regarding wire colours (yep, I'm Canadian -- gotta add the "U"!!) .. Often you'll see in wiring diagrams "NCA" along side the wire. This NCA means -- "no colour available". I share this in response to your comment regarding "sometimes colours are wrong or different". This NCA label has perplexed me on a few occasions and in the spirit of your videos and sharing ... I thought I'd pass it along.
Great vids... I look forward to the rest!
Thanks MacDonalds Motorworks!!! Great tip on the "NCA', thanks for that!!!
Mike Becker, Senior Instructor
Thank you Mike! And I don’t understand why you have 4 dislikes, like what is there to not like? Seriously!!! 😂
Hey AbsolutePower, thanks for watching! Some people are never happy ;)
Mike Becker, Senior Instructor
Possibly guys with other auto electrical TH-cam channels.
I am not sure if you’ll see this. However I’ve been studying automotive wiring for quite some time now with scanner Danner. I was a mechanic for many years and did a lot of mechanical type repairs when I decided that I was getting old I’m tired of fighting suspensions brakes hammers LOL. Anyway I had tested enough circuits that I just excepted that the power side of the circuit had a ground at some times and just to check and see if that was normal I checked many relay circuits with a DVOM. It’s awesome that you explain it That way and yes it may be confusing for some beginners. If you’re a beginner don’t let that throw you off are many instances where things are changing in an electrical system back-and-forth. Such as what they call a floating ground energy and power window switch. Anyway good luck thank you for the videos!
Love the info good job makes me want to learn more
Hey DramaFree, thanks for watching! Stay tuned for more :)
Mike Becker, Senior Instructor
thanks Mike & GoTech. very useful, subscribed. keep 'em coming.
greetings from Italy
Thanks Lorenzo, will do! Stay tuned!!!
Mike Becker, Senior Instructor
This video was made 2 years ago and still today very useful because im heading towards my 3rd year course and all about electrical diagrams and systems. I thank you for this video and definitely learning!!!
make it 3
Thanks Mike for the cool video !
You are a great teacher !
Thanks Chris, appreciate that!
Mike Becker, Senior Instructor
Keep em coming Mike.
Will do Mark, thanks for watching!
Mike Becker, Senior Instructor
Wow i review 2x and i got your purpose. Its very exellent this is a true technical works.
Hey Oto, thanks for watching, twice :)
Mike Becker, Senior Instructor
@@GoTechTraining ty sir so much im a auto electrician here in our country. Im still learning.
Another Nice video to add to the collection.
Hey D. D, thanks for watching :)
Mike Becker, Senior Instructor
Great Series Mike.. Had this show casting from my phone to the tv and when done it cut everything off with the chat..Not sure if my last comment made it thru but just wanted to say Awesome work into this Mike. Top Notch as always Bro.
Also, Ozzstar never disappoints... Lol The Iron 🤣
Hey Kevin, thanks man! Mine cut off too...ended up on an Eric O. video lol! He loves my wrinkles lol!
Mike Becker, Senior Instructor
you are good on explain how it work, i all way keep follow on your Teaching ..Thank you
Hey Sam, thanks a ton! Stay tuned for more :)
Mike Becker, Senior Instructor
Man what an excellent presentation, clear and easy to understand. Just subscribed. More power💪💪💪
Hey Jonie, thanks! Welcome to the channel!
Mike Becker, Senior Instructor
Power on💪💪💪
Best videos and teaching class.
Wow, thanks Mike!!!
Mike Becker, Senior Instructor
Excellent Mike.Thanks
Hey, thanks a ton! :)
Mike Becker, Senior Instructor
I don't know, I'm just starting to learn from you
I hope thanks to you I will understand and repair mazda 3. After replacing it with a used engine thanks
Very nice videos series, thanks a lot. I would like to know what kind of program are you using ?
Thank you so much for doing these video very useful to my job
Hey Mike and hope you and the family are well. Great presentation and I'm sure your series will help techs out there understand wiring diagrams. Looks like no one has answered your question. I'll take a shot at it. I'll start with Technician A. It's possible that pin 50 could be shorted to another B+ circuit, but it's not likely. To disprove this theory, the technician could turn off the ignition switch and recheck pin 50 to see if the voltage disappears. If the voltage disappears, then this would disprove technician's A theory. On the other hand, if the voltage is still there, then there is a short to another circuit or the contact for the ignition switch is bad, being in a closed state all the time. To isolate which one of these is the culprit, C134 could be disconnected and recheck pin 50 with the ignition switch off. If the voltage is still there, then the multimeter could be placed on the connector (disconnected) pin upstream where the switch is located. If the voltage is gone, then the problem is a short to another B+ circuit. The multimeter could be moved downstream of the connector pin to verify that there is a B+ short to another circuit.
Technician B says that the primary circuit is okay. The only thing that is true with this statement is that the primary circuit is not open. Without a load being on the circuit, there could be 'hidden' resistance in the circuit. Also, the primary winding could have a shorted turn or two and without a load, having 12.3VDC just means the primary circuit isn't open. An amperage check of the primary coil using an oscilloscope would be the most conclusive test to confirm this if the coil has a shorted primary winding.
So, it's possible that technician A could be correct, but it's not likely, and technician B saying that the primary circuit is okay is not correct.
Hey, we are doing well, thanks! Hope the same for you! Your answer is 100% correct. I am accepting Tech B as an answer...but really the answer could any of the above. I do these things intentionally. It adds a bit of challenge to the guys who know what they are doing, like yourself, but it has the simplicity at face value for the people whom this may be their first time with this type of circuit. Either way, it's really just done in good fun and an excuse to hand out t-shirts to people :) As always, I appreciate the depth of your comment and the time spent on it! It's comments like this that make a more "simple" video so worth it for me!
Mike Becker, Senior Instructor
@@GoTechTraining Yep Mike, couldn't agree more that it's all about learning and with learning comes thinking. You still have my mailing address for the T-shirt? 😊
Why don't you email me it to me just in case? That way if I can't find it i'll have it. Michael.becker@wellsve.com
Both tech are correct.
Tech A is correct because in this scenario, if Pin #50 wire short to power, your voltmeter will get a power measurement (about 12.3 V) at Pin #50 wire. Power wire will feed power to Pin #50 wire. To verify this, you need to disconnect electrical connector at coil #3 to isolate the Pin #50 wire. Also, tech B is correct because when the circuit is off, the voltage will pass through fuse, wire, primary coil winding, and pin #50 wire. No current flow, no voltage drop.
Thank you very much for sharing your knowledge & experiences! Have a nice day!
Well stated answer How Dy, nicely done!
Mike Becker, Senior Instructor
Very nice tutorial series, thank you sir.
Hey David, thanks for watching!
Mike Becker, Senior Instructor
Great vid. A wk ago, I knew nothing. I've schooled myself reading and watching the explanations of what I see on my Ford wire diagram. (1996 Ford f-350 powrstrk w/auto trans, 4x4, reg cab long bed). If I had to answer the question rt now, I'd say the voltage drop from 12.6 is the concern and its where its being tested. I'd then back check each component until I found the 12.6 volts again.(With the key in the key on pos.) I'd guess its a bad ignition coil.
Btw, I just subscribed and look forward to the next lesson. Im hoping the answer to the quest is in next vid. I'll make comment then. Thanks bro✌️
This is agreat and FANTABULOUS video Mike. It was splendid and very straight forward. the direction of the compass of your video was very straight to the point. A true auto technician must rate it excelent bro. More elbow. But I have not find out the part 3 of it. How will i go about it bro. Thanks so much for your compliances.😘
I learned a lot from this video
Made perfect sense to me.
Awesome to hear Cstar, thanks for watching!
Mike Becker, Senior Instructor
Great video!!
Thanks Kicheol!
Mike Becker, Senior Instructor
I am taking Tech B because the key is on the on position and current is traveling through the coil winding's inside the coil. Tech A is kind of right also because the power passes through the coil winding making seem or look like a power short. Great teaching videos.
Hey Bernarda, tech B was correct here. Thanks for watching :)
Mike Becker, Senior Instructor
Thanks for your good knowledge and videos you share with us man,just subscribed to your channel, you are a very good teacher,God bless.
Hey Fabian, thanks for watching and subbing! Welcome to the channel :)
Mike Becker, Senior Instructor
My thought for ground to be controlled I.e. 1:) a hall effect switch determining engine trimming or 2:) a computation of two hall effects i.e. cam and crank position switch signal both of whichever could use said pin for report further wiring schematic reference would clear this question up. I am merely a transmission builder so what do I know. P.s. keep up the great lessons!!!
About to rewire my whole car, this is the best series I could have stumbled on. Thanks guys!
Ps. Mine has a coil and points. Ha.
Hi great video, this switch is on and pull up design ( I think)so it should have power in the on or hot position, and the pcm grounds it in side causing the coil to collapse and creating the secondary ht spark, is that right? And does the power still travel through there coil windings regardless,? I’m not sure , could you explain?
Great video nice explanation of the diagram to the real world circuit. Subscribed
Hey VWTG100, thanks for watching :) Stay tuned for more!
Mike Becker, Senior Instructor
Thanks for teaching Mike, great video I learning from you🙏 the only thing that the letter for example pin # 50 from the wiring diagram is too small to see, could be my cellphone, but everything just great 🙏🙏🙏🙏🙏👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍thank you👌👋✌
Hey Salvador, thanks for watching! Yeh, I guess a phone would be pretty hard to see it :(
Mike Becker, Senior Instructor
Concerning the horn diagram. Between the horn assembly and ground G101 and above BK (black) there is the number 1250 (similar numbers in other location such as above D-GN the number 29). What does this number stand for. Also on the COP diagram letters and numbers such as CE307 or CBK04. Many Thanks Great Job.
Good explanation cheers from Portugal
Hey Ricardo, thanks!!!
Mike Becker, Senior Instructor
I got an exam tomorrow for another technician job and I havent used my electrical knowledge in a while. This is a great series.
Hey Diddi_k,
So did you get the job? If not, no worries there are plenty opportunities out there!
~Ryan Wilsing
@@GoTechTraining Unfortunately I didn't. They tested on older vehicles. Lol. I'm more knowledgeable in newer vehicles with obd2. Thanks though
I'm also more knowledgeable on the new stuff! Good luck in future endeavors!
~Ryan Wilsing
@@GoTechTraining Thank you. Keep up with the great videos.
12.3 would be normal operation KOEO, so B. There is nothing pulling it to ground, so what you basically have when connecting a multimeter in this exact fashion is a loop to battery voltage with a small resistor. Ground it at pin 50 and you'll see it spark one time if the coil/plug are good, and if all components are serviceable for a 12-16v load @fused amperage. TechA just needs a little help.
Hey Christopher, yep, tech B is what I was looking for. Nice!
Mike Becker, Senior Instructor
@@GoTechTraining thanks, Mike. Ive got a background in writing diagnostic procedure and theory, so I might be cheating a little haha.
I don't know if Nissan does it anymore, but my 1995 service manual shows connector pinouts on most diagrams. They also include the connector's color, which makes troubleshooting easier. Like you said, each manufacturer is different, so it's like learning multiple languages.
Hey Joseph, that's always handy to have the connector color...unless they are all black, or whatever ;)
Mike Becker, Senior Instructor
Hello Mike I'm learning a lot 👌 what program do you recommend best out of all the software out there ? Alldata / mitchell/ identifix or which one do you use?? Thanks Mike
Hey Edgar, thanks for watching! Hard to say which is the best...they all have their quirks...just like scan tools, right? I use AllData and Identifix currently.
Mike Becker, Senior Instructor
Mike, can you please clarify how this circuit is made/looped because I'm just looking at 2 lines/legs that both terminate at ground... does each line represent a circuit (2 wires making a connection?) and if so, where is the connection loop?
Thanks
will you be covering real world specific issues like melting fuses and troubleshooting the tuff stuff where you can not realistically trace a wire for shorts
Hey VWTG100, the plan is to cover all of that!
Mike Becker, Senior Instructor
Thanks for this videos. On wiring diagrams most wires eg to signal lamps come from another connector. It does not say which wire is power & which is ground and none of the wires are black. In this case how do you know which wire is ground? How do you read schematics when there are many wires going into and coming out of ECU or instrument panel connectors? How do you tell whats an input or output? Thanks!
Cyl 3 misfire. Swap ignition coil from 2 or 4 to 3. Run vehicle then check codes again. If it moved to 2 or 4 then the Ignition coil is bad. Could also do a spark plug swap but most of my misfiring issues were bad coils. Sometimes labeled brand new coils or remanufactured coils can have these problems.
Can you just disconnect the air bag circuit plug in until you are through testing or would that signal a short or a open circuit
I need some help. I have a 2002 pontiac grand am. It cranks but will not start. Can you send me a simple diagram of the circuity from the fuse box to the switch key to the BCM to the ECM to the coils and ECM? I traced the wires from the plug to the ECM from the coil plug. I have a side crank sensor and found it to be ok ohm wise and that plugged to the coil pack on one end next to the plug that went to the ECM. I cannot get any readings of 12 volts on either end of the four wire plug and the other end plug next to the alternator. One wire is ground the other went to the fuse box and recieved its power from the yellow wire off the switch key. How much volt should i read at that point on the volt wire to the coil on that end? I cannot get any fire at all. If the ECM wires are all connected via continuity to the coul ICM at the coil pack what will give fire to the coils out of the ECM and what is the best way to test the wires at the ECM for correct output? If no output then what will make it give output with what wire? I have three wires off the crank sensor under the front pully but two wires off the other side block sensor.
İs it normal when i disconnect the car battery & the ecu than the horn fuse to check if there is a short in waring harness with melty meter and its reed a short with body ( or grounded ) its fine ? Also the same thing with coolant pump when the uce plug in there is no short but when its plug out there is short in the pin of orange wire ( e92 bmw )
Tech B would be correct because the circuit is energized with the key on. #50 should be hot at Key-On. Tech A is sort of also correct, but the "short" is actually switched power which is currently ON, passing through the coil, LOOKING for ground.
Hey, thanks for watching! Well stated correct answer :)
Mike Becker, Senior Instructor
Thanks for the explanations, it is helpful. I can't see any small detail of the diagram, I don't know if I'm doing something wrong, but I couldn't zoom in. Tried the full screen but still couldn't see the little details. Maybe you could enlarge the diagram when referring to a specific contact. Thanks
Hey D Veloso, thanks for watching! I'll see what I can do about that.
Mike Becker, Senior Instructor
always good video thank. i had a couple of car that run on point vw1966 beetle 6 volt car .1972 volvo
Hey Dan Man, thanks for watching! Ohh a 6 volt car...almost as fun as the old positive earth cars...I really appreciate newer cars ;) haha!
Mike Becker, Senior Instructor
@GoTech me two
Hey Mike, Really enjoying this series and looking forward to the future vids. One quick easy question... On the horn diagram, above each color code there is a number. The numbers are a little blurry on my monitor so I'm not exactly sure what they say. Some look like 29, others look like 26. Question is: what are those numbers? I thought they might be wire gauge but the numbers above the black wire are larger (1250, 1450) so I may be off in left field. Can you clue me into what those numbers are? Thanks!
Hey Trey, thanks for watching! Many times those numbers are the circuit identifier for the engineer, sometimes they are wire gauge. They really don't do much for us, that's why I didn't specifically mention them. Can't think of a time when I used them in a diagnosis.
Mike Becker, Senior Instructor
Could you please explain how the body control module works? I am having difficulty in visualizing it. Thank you very much and you are the best
Hey, I think an explanation of the BCM is a much larger conversation than what we can get explained in this comment. Basically the BCM is the control device that controls whatever is tied to it. It will take inputs from varius sensors, make a decision with that data and send it the command to varius things.
Mike Becker, Senior Instructor
Tech B is correct.
The current is flowing through the primary winding of the coil to the PCM.
It is not being "grounded" yet.
Exactly, well done tpcoachfix!
Mike Becker, Senior Instructor
Thank
@@GoTechTraining isn't that test almost useless being that the circuit isn't loaded
Ohhhh, makes sense now . I was confused at first. I thought it was a short to power and forgot the pcm has to ground that side of the circuit . Thanks
Current will not flow til circuit is completed
🤸🤸🤸 waiting..
Worth the wait!?
Mike Becker, Senior Instructor
Having come into this three years late I would still like to give my answer. Tech B appears to be correct in that the wiring from 12 volts all the way to pin 50 appears to be good because if pin 50 was grounded you would see no voltage on that pin. However that does not mean there is not a circuit fault that allows the voltage to show up but be of such high resistance that enough current can flow to activate the coil.
Tech B is correct, because the voltage will flow to the primary coil, through the coil and to the computer looking for a ground. With the circuit not grounded, there will be no voltage drop across the primary coil, and therefore will show battery voltage at the engine computer(pin 50)
Hey Bryan, thanks for watching! That's correct. Well stated explanation!
Mike Becker, Senior Instructor
B IS THE ANSWER AND WILL BE 12V UNTIL TRIGGERED BY PCM AND GROUNDED. BACK IN BMT HOSPITAL WITH MORE COMPLICATIONS . USING DIFFERENT LAPTOP AND DON'T HAVE YOUR EMAIL ON THIS ONE USING MY DIAGNOSTIC LAPTOP. GREAT PRESENTATION AS USUAL!!!!!!!!!!!!!!!!!!!!!!!
Hey Bob!!!! Ugh, sorry to hear your back in there. Stay positive my friend...gotta put all those new tools to use ;) You're in our thoughts and prayers!
Mike Becker, Senior Instructor
@@GoTechTraining Thanks Mike!
Hey, Mike. How are you doing? We haven't heard from you in a while. To find out what is not shown to us in the diagram, we need to know how the system operates. Some starting system has the pcm in a square box grounding the starter relay without showing the input such as park neutral safety switch. Thank you for always providing you great content. I hope that you are doing well. Happy new year to you and your family!
Hey BB MD, im still around. Just busy with a different project at the moment...but otherwise doing well, thanks! Hope the same for you!
Mike Becker, Senior Instructor
Good job sir
Hey Nadeem, thanks for watching!!!
Mike Becker, Senior Instructor
Very good sir
Hey Khan, thanks!
Mike Becker, Senior Instructor
Hi Mike, saw this one late and just want to comment on the question:
This is basically an open circuit test, so tech B could be wrong; the primary windings might be shorted or the circuit may have high resistance and you'd still get a 12V reading on the dmm. Current ramping will reveal the truth.
Tech A might be right, the coil's primary could be shorted to power, but this would require further testing to confirm.
Greetings, stay safe.
Hey Juergen, better late than never ;) Ahhh you read through the question and questioned the question. Love it! There really wasn't a right answer or a wrong answer here...depending on how it was explained. I'm planning on expanding on it in part 3 :)
Mike Becker, Senior Instructor
If power flows all the way through the relay until the horn switch is activated, why does the relay or switch not overheat when a ground is applied from the switch? Why does the ground not continue back through the relay all the way to the battery positive when grounding one side of the relay?
Are always suppose to assume we are back probing these circuts when testing?
Tech. B is correct since there is voltage thru the circuit so no short.
Question: in the diagram, the power supplier is displayed as red but on the fysical wiring, for example on you multi meter the positive side is red. This sound counterintuitive, am i mixing the old style of electric flow ( electron go from positive to negative) with the new style (electrons go from negative to positive side? 🙂
Hello Electrons always flow from the negative to the positive terminal
I think you you are confused with the
Conventional current and electrons current
1-Conventional current or simply current, behaves as if positive charge carriers cause current flow.
2-The flow of electrons is termed electron current. Electrons flow from the negative terminal to the positive
@@mustafaameen3512 Thanks for the anwser, my confusion is mainly due to the colours of the fysical wiring vs the colour of the diagram. Is it correct that those are the oposite colour for the positive and negative side?