My neighbor's 1995 Lexus SC400 will not start and he states it is because it keeps blowing a fuse as soon as ignition is turned to ON. Can we use a scientific approach to find the issue without firing the parts cannon?
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@turtlezed3 жыл бұрын
Yes it is all in the diagnosis... .your train of thought is good without even using a short finder and you're absolutely right, it never gets old getting it to run 👍
@ryanmurray90173 жыл бұрын
For future reference, if you plug a headlight bulb into the fuse socket using small terminals, you will save on sacrificial fuses. The headlight bulb draws enough current so it won't burn wiring. Headlight bulb on - short to ground exists. Headlight bulb off - short to ground doesn't exist.
@0tt0z3 жыл бұрын
Thanks for that tip!
@scientist1003 жыл бұрын
Same technique can be used with a test light. There is no need to draw too many amps by using a high amp bulb and it will drain the battery faster as well. If you have a battery charger then that's not a problem but most people probably own a test light.
@HansJorgensen3 жыл бұрын
Yup. Circuits need a load in order to not be short to ground. Doesn't matter what kind of bulb it is, it just has to complete the circuit. Then you can sort from there. Unplug your easy to get to components and see when the light turns off. Note your ohms law comes into play with intensity of the light bulb and resistances in the rest of the circuit. After a blown fuse repair, I always check current through the circuit with an amp clamp to make sure it's correct.
@HansJorgensen3 жыл бұрын
You can also use a buzzer or horn as a load if you are working somewhere where a bulb load can't be seen.
@justdata36503 жыл бұрын
Nice tip. Just one small correction on what's happening. It's not that it "draws enough current". It's that the resistance of the filament is high enough to limit the current in the circuit to a safe amount so as not to cause damage to the rest of the wiring. Ditto with a tester or anything else you put in the circuit that's designed to work on the native 12V in the car.
@Jeff-gr1on3 жыл бұрын
Honestly, even though these videos are very informative and helpful with automotive diagnosis, the thing I get the most from these videos is an opportunity to experience the entire journey from problem to thinking to troubleshooting to solution. It always leaves me feeling better about working through a problem, either automotive or otherwise- it's always a great boost when I'm in the woods struggling to get my bearings!
@SchrodingersBox3 жыл бұрын
thanks! Yes the process has nothing to do with automotive actually- it applies to ALL problems in ALL disciplines-- even “life” problems.
@smrtnz5995 Жыл бұрын
IT STARTS! Cracker Jack troubleshooting skills. I worked as a aircraft electrician during the 70’s kc-135’s, F-4’s, c-130’s, T39’s, Helicopters coming from Vietnam. Space or the lack of it was an always an issue when working on aircraft, decades old age and hard duty but I loved it all especially the a-hah moment.
@TheDisgruntledMechanic3 жыл бұрын
You are the man Matt! Now back to video!
@nathantechnician24753 жыл бұрын
Big man, you have no idea how your videos has helped me as a young auto engineer. Since I start following them my skills has impressive improved.
@SchrodingersBox3 жыл бұрын
glad to hear it!!
@justdata36503 жыл бұрын
One of my secrets revealed. Getting closer to a culprit/answer/etc. by dividing by two in my industry is called Successive Approximation. From 100 possibilities you get closer to the answer fast: 100, 50, 25, 12, 6, 3, 2, 1 so if you had 100 possibilities you can figure out the source in just 7 steps at the most.
@SchrodingersBox3 жыл бұрын
I love the math on that!!
@reneneron29713 жыл бұрын
The "20 questions" logic is spot on. For diagnostic purposes, use a test light as a replacement for the fuse...it is self limiting on current draw and will light if there is a short, making diagnostics for a short much faster (and cheaper) than continually replacing fuses. When light is out, you eliminated the short.
@nikovandh3 жыл бұрын
Always impressed by your thorough explanations and strategies. You're a great teacher Matt!
@SchrodingersBox3 жыл бұрын
I appreciate that!
@alanscrivner18813 жыл бұрын
"A Fist Full of Fuses" A sensible, pragmatic automotive diagnostic video filmed in the West starring a Clint Eastwoodesque scientist and automotive enthusiast. Does he feel lucky? The script and story are fine, but still needs some western styled theme music and a clip of the car driving away in the sunset. Nice diagnostic. Thanks.
@SchrodingersBox3 жыл бұрын
hahahaha I was I thinking I should come up with a reference to that when I said it but your idea would have nailed it. I totally should have done a montage or something lol.
@JB-dv3to6 ай бұрын
Awesome. I know this is an older video. But helped me on my son's 2001 lexus IS 300. It was blowing the EFI Fuse and ended up being an oxygen sensor melted wire. Appreciate the info!!!!
@beninchesapeake3 жыл бұрын
Another great video. To borrow a phrase it never gets old seeing your methodical approach to diagnosing the issue. And no worries about the garage. If you see a tidy garage it usually means it's not being used enough.
@SchrodingersBox3 жыл бұрын
oh I am doing something about the garage! ;-)
@Honky_Konky_Phooey3 жыл бұрын
Wicked video I hate electrical things but watching your videos gives me the confidence to have a go, Thank you 👌
@CarDocQatar3 жыл бұрын
Hi. I just want to say You and ScannerDanner are making the lives of mechanics much easier. Thank you masters.
@SchrodingersBox3 жыл бұрын
Our pleasure!
@johnkaplanian4743 жыл бұрын
Dear Eng. Matt, also and for your ease as you may aware there is a device named "automotive short finder tool" or "automotive open circuit finder tool" where you can feed 12V electricity to one part of the circuit and track the electricity through the wiring harness till you reach the shorted or cut end. It is also very handy for house circuitry. Its price through ebay ranges from $ 30 to over $ 100. Oh, By the way, maybe later on you need to find a land lot or a house with a big land so you can build a sort of prefab warehouse on a concrete slab with at least 6 meter wide by 6 meter length and 5 meter height where you can put inside a car lifter where that would be a vast playground for such a great hobby, but I shall warn you never to do it unless you have the financial capability to do so without ever involving in any sort of loan, like if you have a multiple rental properties that yield you a stable income of 6 or 8 K / month after overhead expenses, in addition to your career work in engineering field (a cash flow dream Lool), if not, then play small Loooooooool. Enjoy your Heaven. John Jack Kaplanian from Jordan, Middle East.
@labradormcgraw3 жыл бұрын
It's always a good day when a new Schrodinger video pops up - and this one is no exception. I'm sure your 'divide by two' method of eliminating variables will instantly inspire a plethora of time-saving diagnoses. And what a time to go sporting a half-beard! Granted it looks better, but my cellphone tells me it's currently -4° in Denver - what were you thinking? Hahaha.
@SchrodingersBox3 жыл бұрын
hahahaha I trimmed the beard before I knew an arctic blast was coming lol!
@monkeywrangler52003 жыл бұрын
Fantastic method and explanation for narrowing the problem down.
@alrifainidal3 жыл бұрын
good job Matt. nice find hopefully we can see more video like this one
@johnobiro52023 жыл бұрын
I love the way you diagnose the problem. Then the way you explain it. Totally understandable. Thanks.
@SchrodingersBox3 жыл бұрын
You are so welcome!
@mainejohnson2053 Жыл бұрын
That was educational, entertaining and inspiring. Watching your video made me forget about my own project, but I learned a lot about the process needed to fix mine. You just gained a subscriber. Thanks.
@SchrodingersBox Жыл бұрын
Great to hear!
@zaytoony3 жыл бұрын
Perfect video for valentine's day evening, awesome catch Matt!
@johngibson35943 жыл бұрын
They make resettable breakers for some of those if you do a lot of blowing fusee issues it worth having. I love watching these kind of videos. For some reason I haven’t been showing in my list. . Great video.
@jgeorges30613 жыл бұрын
Hi Matt, AWSOME approach and always good to see you up loading videos cheeeeers.
@SchrodingersBox3 жыл бұрын
Thanks J!!
@89531473 жыл бұрын
Great work Matt using logic, especially that troublesome O2 sensor harness which finds its way into a pinch!
@SchrodingersBox3 жыл бұрын
Good to see you again!!
@phillloyd86253 жыл бұрын
Another great SB video, really like the logic 👍
@northpoint10393 жыл бұрын
I wonder in the schematic there must be a common junction connector to separate the different circuits that run off that fuse. Perhaps taking a multimeter and unplugging the junction and test the different pins for grounding. Thank you very much for the videos and some of your responses over last Christmas.
@ncsarola3 жыл бұрын
Excellent video. Very logical and sensible approach. Thank you!
@dosgos3 жыл бұрын
Excellent troubleshooting.
@wddarrius3 жыл бұрын
I always look forward to/learn something new from your uploads. GREAT content!
@weldingjunkie3 жыл бұрын
Nice video thanks for sharing. Those dang sensors I called it before even watching. Great deduction of reasoning and explanation on how to divide and conquer...Jay
@pto2003 жыл бұрын
Very good job - as usual. Enjoyed the process. Thank you for sharing your work.
@SchrodingersBox3 жыл бұрын
Thank you too!
@zerkfn85013 жыл бұрын
You the man bro. I'm glad to see you making videos again. You saved my azz a few times. ☺
@SchrodingersBox3 жыл бұрын
Glad to hear it!
@Ianf1x3 жыл бұрын
Great job I am one of you're do it your selfers with automotive experience . I like it when there is a Good short to ground on positive I put test light across fuse and when it lights bright short is there and when at half brightness has gone . Bulb now in series with load.
@user-sb4wg4uc2k3 жыл бұрын
A Leo Tolstoy's "work as a reward" in flash. MAESTRO.
@enriquemartinez79903 жыл бұрын
Thank you again I do have a question I want to learn more I’ve been learning with your videos but I want to get like a class online what do you recommend to do what classes you think I should take I had a class before online but then in the end they take it away you don’t get to keep the classes the videos or nothing when you’re going to go back you don’t remember something you’re done you don’t know anymore thank you and I was just wondering what classes online you recommend I only been working on cars for like four years I want to learn more thank you
@SchrodingersBox3 жыл бұрын
unfortunately I don’t really have an answer to that since I never had any automotive training. I can’t speak to any classes or courses.
@1_D3333 жыл бұрын
I clicked the thumbs up button before playing the vid, I know Matt's gonna tackle this 😁
@SchrodingersBox3 жыл бұрын
hahahaha. I appreciate it! it balances out those who click thumbs down before watching.... and they still watch the whole thing lol.
@georgebonney903 жыл бұрын
Thank u sir i really appreciate your knowledge 👍
@ruschman963 жыл бұрын
I really like your approach, thank you for sharing. Cheers.
@SchrodingersBox3 жыл бұрын
Thanks for watching!
@hondatrix3 жыл бұрын
Had the same issue on a Chaser 1JZ, local guys tried everything, according to them, even a different ecu, and guess what, it was an open wire on the 2nd O2 sensor touching the exhaust....
@eman08282 жыл бұрын
I learned that technique through Scotty Kilmer which is what I call test and eliminate or subtract. I apply those same principals to others thinks such as repair computers. As a former Computer Reapir Tech at a local Computer shop, I had a customer bring in a custom built PC with blue screen error code Memory management. The most logical think I did was to pull all the RAM modules except one and then start the computer to test the RAM module. I repeated the same steps for each RAM module until I found the bad one. Only 1 out if four were bad and I replaced it.
@Rein_Ciarfella3 жыл бұрын
“If that doesn’t show up then I suck at filming”. LOLOLOL!! Good one! Nice diag and very satisfying for us too! I call that diag process the 50% Process - decouple half the variables. The only thing you missed was explaining the rest of the process to the end if the culprit is at the END of the trail, not within the first 50%, I.e., next eliminate 50% of the remaining suspects, etc.
@Juozas_cbr3 жыл бұрын
Very nice video buddy. Can you show us next time how looks that burned whire or another component what you gonna have in the future pleas 🤗
@bash65663 жыл бұрын
Thank you, perfect and straight to point. God bless you always..
@konstantinusstoyanov97493 жыл бұрын
I definitely enjoy your videos
@SchrodingersBox3 жыл бұрын
I'm so glad!
@aussiebloke6093 жыл бұрын
Would a selection of plug-in circuit breakers be better than going through a handful of fuses each time you need to diagnose something like this? Or would they react too slowly to effectively protect the electronics?
@SchrodingersBox3 жыл бұрын
EXACTLY! I know a lot of people use light bulbs and circuit breakers etc and actually I am sure they are fine however I absolutely worry about sustaining the amperage longer than what a fuse does and potential harm to the pcm or other components or even providing voltage to other wires in a damaged harness like this one (3 lengths of bare wire were all touching each other). I am pretty sure, , especially on a 12V circuit, the light bulbs and CB techniques are OK but I just don’t like to take chances on something I might be unaware of and I almost always catch these things within 2 sacrificed fuses anyway.
@mattt41833 жыл бұрын
@@SchrodingersBox Agreed on circuit breakers. Their slower trip increases blowing an ECM output if the problem is a shorted component. Lamps automagically limit current which reduces the risk of blowing anything. And with this power>ground short you could connect the lamp from B+ to the circuit key off when all ECM outputs should be off. And yes the battery is always spanked. Gas hand usually on E too. Unless it's the fuel pump................
@godfreypoon51483 жыл бұрын
The technique you describe is called a binary search, and yes, it is tops.
@averyalexander23033 жыл бұрын
Great tips! This happened to me too. Years ago I couldn't get my car to start after changing an intake manifold gasket, it kept blowing the ECU fuse as soon as I turned the key on. Unplugged everything on that circuit and still had the same problem. The problem ended up being that somehow one of the fuel injector wires got pinched between the fuel rail and one of its mounting studs during reassembly, shorting it out.
@SchrodingersBox3 жыл бұрын
that would do it!!! yeah I very, very often see stuff like that on cars that had major repairs like cylinder head or engine replacements and they don’t start after the repair. even more often actually, I see it on cars that had major work done within the past year because the wire harnesses are often not routed the same as before and they run along exhaust or sharp contact points.
@averyalexander23033 жыл бұрын
@@SchrodingersBox Yup I often see problems from poor wire routing too, a lot of the problems I see are just as a result of laziness and carelessness such as not properly securing wiring or hack installs of aftermarket accessories. Just taking the extra few minutes to properly route and secure wiring harnesses goes a long way towards helping to ensure reliability!
@SchrodingersBox3 жыл бұрын
Aftermarket accessories LOL!!! Oh man those are the best. I would estimate about half the electrical issues I see are from aftermarket accessories. And of those- probably 80% are for parasitic draws.
@enriquemartinez79903 жыл бұрын
Thank you very much again thank you for helping your neighbor pretty cool man another fantastic video no surprise thank you👀🌿
@SchrodingersBox3 жыл бұрын
Thanks again!
@enriquemartinez79903 жыл бұрын
@@SchrodingersBox Hi Matt thank you another question how can I get to your pay channel?
@SchrodingersBox3 жыл бұрын
it’s at www.Schrodingersboxqm.com.
@Pablo_Automotive3 жыл бұрын
Great diagnose Matt keep my friend. =)
@SchrodingersBox3 жыл бұрын
Always!
@kman-mi7su3 жыл бұрын
Another great diagnostic video. Yeah, I'll bet it was a whole lot of fun working in that tight space to fix the harness. If you are like me, when I have to do a repair in a tight space like that, you'd better tell the kids to play in the backyard or at a friend's house. I'll get it done after finding the issue, but the engineers who designed the car/truck will definitely be called some names not fit for kids' ears because of tight working spaces like that. LOL! Fortunately, my kids are grown now.
@SchrodingersBox3 жыл бұрын
omg dude you don’t know the half of it... I was going to even do a video on it but I was so freaking pissed and out of control I just wanted to get it over with. To drop the cat I had to remove the Y-pipe so I had to unbolt it from the opposite cat and to do that I had to a remove these stupid support brackets and of course everything was rusted so bad... then when I finally got that done the stupid transmission dipstick tube was in the way.... but the tube is integral with the transmission pan so I had to drop the pan to get the tube out of the way. Then when I finally got to the wiring it was so destroyed and brittle it kept breaking like pretzel sticks all the way to the harness so I had to dissect them out of the harness to repair them. Then.... THEN I discovered the OTHER O2 sensor also had an open in its wiring so I did the whole job TWICE!! I almost quit the channel at that point.
@kman-mi7su3 жыл бұрын
@@SchrodingersBox I feel your pain! I've been there more than a couple of times. I always say, "If I ever meet the engineer who designed this car, he will be spitting teeth after I punch him in the mouth!! and if he's a she, I'll punch her in the mouth!!" I think they should make engineers at these car manufacturers spend a couple of years working on these systems with a guy such as yourself so they can see what they design and how hit sometimes screws the person who has to repair it.
@1ZZFE3 жыл бұрын
That's amazing! U r my teacher!!!
@davidcoudriet84393 жыл бұрын
Love your vids Matt! All Hail the Cat!
@richard18353 жыл бұрын
Thank you. Great Video. Thumbs Up
@scientist1003 жыл бұрын
I had a 99 ford escord that was blowing the 20 amp fuse as soon as I would turn the key. I chased it down to the fuel pump module internally shorted, this module was located in the trunk left side of the firewall. Then I had other flushes blowing as well and bad alternator (would get hot by just plugging back the battery). I suspected a shorted regulator or internal component shorting out.
@scientist1003 жыл бұрын
I would have the car off and connect the battery and the alternator would be hot to the touch after a few minutes. Main battery charging cable to the alternator was disconnected and it would get hot if the regulator was plugged so that's why I suspected the regulator activating something that wasn't supposed to, I think it may have been melted because this car had all sorts of electrical issues on the dash and even the blower motor that I have pending to verify if it is operational. I believe this was caused by someone who jump started the car with the polarities reversed. Melted a couple of things here and there. Including the pump regulator module.
@reneneron29713 жыл бұрын
I believe this vehicle does have OBD2 diagnostics but the interface for the scan tool was not standardized yet...proprietary to Toyota.
@SchrodingersBox3 жыл бұрын
oh that’s probably right- I have run into a few 95’s that had OBD2 but it’s been so long I forgot about that. I should try that out.
@reneneron29713 жыл бұрын
The 1994 Toyota Camry with the 1MZ V6 was one of the first, if not first, Toyota that had OBDii...which I own. But I cannot read the codes as the interface is not standard. What you shared is still very useful...just correcting that it is NOT oBDi. On electrical circuit issues with cars, only 2 possibilities...an open or shorted circuit.
@aor32003 жыл бұрын
Excellent!
@steveneumeyer6813 жыл бұрын
I wonder if an alternative would be to use a multimeter on the fuse connection to measure the current, with settings that could handle the high load?
@SchrodingersBox3 жыл бұрын
you can do that- or use a testlight
@blamegame10133 жыл бұрын
I NEED YOUR HELP. I have tried. 06 Acura TL runs fine cold, but stalls out at stop signs when hot. Cleaned throttle body only. Just bought spark plugs and fuel pump. Think it will help!!?
@SchrodingersBox3 жыл бұрын
Wait I don’t understand- spark plugs AND a fuel pump? Is it an ignition issue or a fuel issue and how did you diagnose it? You totally lost me bruh.
@gladmarchatlein81643 жыл бұрын
Hi sir, Normally it's not a great idea to waste time on shortcircuit components just to show others you got the problem. Once you show the melted wires it's OK. AVOID going back to e heated up area/engine to fix the problem. BTW...great and educational video! Thanks. 👍😎
@matth93593 жыл бұрын
Do you ever use a test light from B+ to the fuse leg that's not straight from the battery to save fuses? Since it has a short to ground, it should light up until you find the problem. Maybe this would be a good situation to use an LED light, for protection purposes not knowing what could be going on with the melted harness stuff. I've have success, maybe luck, with the standard bulbs though. Last time I had a dead short like this, I used my power probe 4 in a similar way, watching the lights to change. I started by using the annoying beep sound, but it was too annoying.
@SchrodingersBox3 жыл бұрын
yes that is a very good strategy indeed- I would have done that if I didn’t find the issue right away plus given the location of those harnesses it helped to see the spark
@matth93593 жыл бұрын
@@SchrodingersBox Yeah, whatever works! I like the isolation strategy. In a basic electrical class I went to, the instructor suggested using a bulb and PTC fuse in parallel while looking for the short. I haven't tried it, but some were skeptical of it responding fast enough while messing with the wires.
@georgerocks5191 Жыл бұрын
Good call. Heat and vibration first place to look
@markboheman56913 жыл бұрын
Re: you referencing your cramped garage- did you just give us a hint about something coming in the future?
@SchrodingersBox3 жыл бұрын
Oh.... very perceptive. I can see where someone might interpret that!!!
@sanelelukhele48493 жыл бұрын
Greetings Matt, I struggle to find free wiring diagrams can't afford as a DIY to subscribe to Mitchell where do you get yours great video by the way thanks man
@SchrodingersBox3 жыл бұрын
I usually google them but I have started resorting to Mitchell DIY more frequently.
@sanelelukhele48493 жыл бұрын
Thanks will definitely try it I appreciate you response
@anthonysova71173 жыл бұрын
Nice vid My approach is to confirm the customer complaint in this situation I also go to a wiring diagram which loads go to that fuse next is a visual inspection but never touch the wiring especially if it was an intermittent short to ground or another wire only then will I use a test light or bulb depending on if the pcm is in that circuit Just my 2 cents and by the way I’ve learned a lot from U Cheers
@Ted_E_Bear3 жыл бұрын
Great video !
@SchrodingersBox3 жыл бұрын
Thanks for the feedback!
@shus369 Жыл бұрын
I have a 1991 nissan skyline and my fuel pump fuse keeps blowing. Where should I start looking?
@SchrodingersBox Жыл бұрын
It’s going to be Short on the fuel pump circuit.
@ritchiecassidy9151 Жыл бұрын
That was awsome well done 👌👌👌
@SchrodingersBox Жыл бұрын
Glad you enjoyed it.
@zakdeennetwork8805 Жыл бұрын
Hi Zakee, 2003 Lexus ES300, Changed Battery,Alternator, then reconnected Battery, Fuse Blows, Turns Out it the Alternator Fuse, Replace Fuse, Reconnected Battery, Fuse Blows Again, Now Researching A Solution, Hopefully I’m not the Only Person to encounter this issue. Do you have any idea what I should Look For?
@SchrodingersBox Жыл бұрын
Sounds pretty simple- clearly a short. Isolate the circuit to find it without blowing fuse.
@zlowe36433 жыл бұрын
That thumbnail describes how I felt when I owned a 06 chysler 300
@johnjonz24723 жыл бұрын
This dude is good!
@stuckinmygarage62203 жыл бұрын
And funny And smart. 👍
@bobbywilson40053 жыл бұрын
When your under the car the pitch makes you sound like bert from sesame street :3
@SchrodingersBox3 жыл бұрын
hahahahah, i know it was trying to edit it out lol!
@technomage67363 жыл бұрын
I soon as I read this I heard it 😄
@bobbywilson40053 жыл бұрын
Still got mad love for you tho guy :p
@MartinRivera-ip9zu Жыл бұрын
where do you get the wiring diagram?
@SchrodingersBox Жыл бұрын
I usually google it.
@littleengineer49913 жыл бұрын
Good
@mtrltoolman3 жыл бұрын
Good job man.
@SchrodingersBox3 жыл бұрын
Hey tool man- where have you been???
@mtrltoolman3 жыл бұрын
Very busy but i was around youtube and i watch your latest video. keep it up.
@imanolmorales69553 жыл бұрын
What the causes of a P219A and P128B Air fuel imbalance? Fuel trim are good even at 2,500rpm any thought?
@SchrodingersBox3 жыл бұрын
tons of things. too many to list. what data do you have?
@imanolmorales69553 жыл бұрын
@@SchrodingersBox codes P219 and P128B came out of nowhere car runs great Rpm drop slightly increase speed
@SchrodingersBox3 жыл бұрын
No, I mean what are your fuel trims showing. what’s your MAF and MAP data? what’s your rail pressure?
@imanolmorales69553 жыл бұрын
@@SchrodingersBox I just notice my down stream o2 sensor read rich at 800rpm just checking that rn
@ivanolsen79662 жыл бұрын
did you fix it ?
@SchrodingersBox2 жыл бұрын
of course!
@trangia12 Жыл бұрын
You don’t need a bigger garage, you need a shop building. 👍
@SchrodingersBox Жыл бұрын
Oh man I don’t want to do this full time lol.
@dogbyte5553 жыл бұрын
Could you put a light bulb in place of the fuse? Then if the bulb shines bright, the short is still there. And you don't waste fuses.
@SchrodingersBox3 жыл бұрын
I could but being a PCM controlled circuit I felt it safer to not keep in the shorted condition
@bartscave3 жыл бұрын
@@SchrodingersBox , the headlight ( or smaller bulb) would limit the amount of current passing through the short.
@SchrodingersBox3 жыл бұрын
yep totally agreed- I am sure it is safe but I also worry about the sustained current as opposed to a quick shut off from a fuse and what other circuits may be affected if the whole harness is melted like in this example. It’s probably ok especially on a 12V circuit but I am not much of a chance taker when I am unsure of the actual situation and I don’t like perpetuating the current through an unknown condition.
@user-fm3vf9ej3u Жыл бұрын
I have this same exact issue, how did you fix it?
@SchrodingersBox Жыл бұрын
Just fix the cause of the fuel trim anomaly.
@user-fm3vf9ej3u Жыл бұрын
@@SchrodingersBoxWould I be able to bring my 1995 Lexus SC400 to you so that you could fix this issue for me? I live in Los Angeles California
@PhillyDee2153 жыл бұрын
My '98 LS400 had a crank no start issue....come to find out the sending unit appears to show the gas gauge much higher than it really is. I needed gas🙄🙄🙄
@SchrodingersBox3 жыл бұрын
yeah that’s a good one! I had that happen to me too a while back. The trick to being efficient with that situation is being able to diagnose it’s a fuel delivery problem. once you confirm it’s a fuel problem you will pretty quickly narrow it down but even then it will be last on the triage normally because there is every reason the think there is gas in the tank. but for most other people that car is going to go through $1200 in parts first!
@PhillyDee2153 жыл бұрын
@@SchrodingersBox yeah at 1st I thought I didn't have my control feed on the fuel relay(this car has like 3 fuel related relays)🙄but that ended up being good. I knew it was fuel related but what threw me on a loop was the initial $5 of gas that I put in the tank wasn't enough....simply bc the gauge was damn near 1/4 tank so I didn't think it needed more gas. Two days later of pulling my hair out🥵I added more gas and viola🤣
@sunwen65183 жыл бұрын
I got a 2009 vw cc lost the key fob . I’m in Victoria texas do you know anyone who can program it ??
@SchrodingersBox3 жыл бұрын
sorry I don’t mess with texas.
@stuckinmygarage62203 жыл бұрын
@@SchrodingersBox "Gotta' stick to my day job." Seriously, always good to see/hear your content, Matt.👍
@careyprince811 Жыл бұрын
Grounds through coil in fords that year try replacing it in searry
@johnaclark13 жыл бұрын
Rather than sacrificing fuses and only getting one chance per fuse to see the fault, I use a test light plugged into the fuse terminal. Attach the test light to battery positive and then connect the tip to the leg of the fuse circuit that feeds the load. If it's shorted you'll get a light. Now you poke around the harnesses until you see your test light go out. In this case the light would still light through the heater when not shorted but once you find your suspect simply unplug the sensor and then use the light and poke around the harness. Though with other loads on the circuits this may not work every time.
@bobbytables6583 жыл бұрын
iiagnostics - a new word has been added to brain storage.
@fuckjewtube693 жыл бұрын
My favorite thing is when a 60 year old mechanic tells me to "check 'the' ground, and clean it up". I've literally had bosses tell me to "check the fuses" after I just checked a 10 amp circuit directly at the connector end with a 4.5amp test light and it was good.
@issamenu5en5e293 жыл бұрын
i wish so badly you would do a p0300 random misfire on all cylinders...no check engine, with new plugs, wires and coils...perfect fuel pressure perfect compression, perfect o2 sensors and cat. bc i cannot for the life of me figure out what is going on
@SchrodingersBox3 жыл бұрын
well you got new plugs wires and coils so I am assuming you have found it to be an ignition problem? If so what was the ignition issue?
@hasanvolkan49063 жыл бұрын
If you take the blown fuse out and connect your test light across the fuse connections it will light up, if you then disconnect the suspect components the light will extinguish when the faulty circuit is found, it may save you a few fuses .
@enriquemartinez79903 жыл бұрын
Thanks again Matt and let me know how I can get to your pay Channel thank you And how I can pay you
@SchrodingersBox3 жыл бұрын
it’s very easy. just go to www.schrodingersboxqm.com and you will easily be directed on how to access the videos.
@mrweisu3 жыл бұрын
What if two items on the list are faulty?
@mrweisu3 жыл бұрын
Okay, if your binary search doesn't work, need to unplug all the items and plug them back one at a time
@SchrodingersBox3 жыл бұрын
yep exactly.
@TheDisgruntledMechanic3 жыл бұрын
Man that is some Jim Danner camera work under the car! ha!!
@SchrodingersBox3 жыл бұрын
ROTFLMAO!!! hahahaaha. well hey I may film like him but you look like him lol!!!!
@TheDisgruntledMechanic3 жыл бұрын
@@SchrodingersBox I'll take that as a compliment! HA!
@Robert-ts2ef Жыл бұрын
Get yourself a portable circuit breaker and jumper leads like Eric from South Main auto uses and that way you won’t go through multiple fuses while searching for the fault?
@kennethkristensen5537 Жыл бұрын
Tip.. Use the test light. Batteri + and the light on output on the fuse. Then unplug components until the light stop glow. Then you will avoid to use a lot of fuse
@louoldschool70473 жыл бұрын
you can use a plug in circuit breaker, saves fuses
@Klassyladyk Жыл бұрын
I need some help with mines. I had new alternator and new battery replaced and after it sits for a day the battery goes dead. I need to find out what's going on. I was told I had an electrical problem. I don't think the car shop who put alternator in it done a parasitic drain check. They just got my 600 dollars.
@SchrodingersBox Жыл бұрын
ok- what data do you have?
@Klassyladyk Жыл бұрын
@@SchrodingersBox what you mean what data do I have?
@SchrodingersBox Жыл бұрын
what was the parasitic draw amperage?
@Klassyladyk Жыл бұрын
@@SchrodingersBox I don't know. The mechanic shop apparently didn't check it. They just put alternator in. And car having same problem. Looks like I'm going to have to do that check myself. I have to buy one of those devices
@SchrodingersBox Жыл бұрын
Yep you need to get an amperage draw reading to do anything further. The shop should have done that
@zzzjetta3 жыл бұрын
dude get an endoscope with leds they be cheap now.
@zacharymarkovitz51533 жыл бұрын
"Lieagnostics" I am going to use that one.
@johnwolf14753 жыл бұрын
Why not just send a signal. And pick it up with a sensor?
@SchrodingersBox3 жыл бұрын
I could do that but the problem is on a circuit like this the signal goes everywhere unless you unplug the components first.
@metal0n0v3 жыл бұрын
remember when inside toyotas, there were still stuff engineered by toyota?
@ianwhatley38643 жыл бұрын
👍 👍👍
@SchrodingersBox3 жыл бұрын
interest avatar you got there.
@xaviergonzalez51453 жыл бұрын
You rock bro! Outstanding video and strategy! Only I can say: thank you!!!