Parts Cannon of the SENTRA! Part 2 (Shorted 5V Ref)
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- čas přidán 22. 10. 2022
- We're so close to victory...I can smell it!
Will the poor Nissan Sentra fire up and run NO PARTS REQUIRED?
Not so fast...now we get to figure out what caused the carnage in the first place.
It starts, but runs like GARBAGE!
THINKTOOL PROS:
www.amazon.com/dp/B08XXWHQVJ?...
ASTRO DVOM:
www.amazon.com/dp/B07FDBW1PT?...
Enjoy!
Ivan - Auta a dopravní prostředky
Very good diagnostics and repair for the no start problem. When pushing on the gas pedal it even sounded like a plugged cat. It was replaced and so the Sentra is on it's way. That broken intake boot started the whole problem which overheated the cat, followed by melted wires. I'll bet this car ran bad for a long time due to a lack of routine maintenance.
Very good one Ivan.
I can't believe that it even ran with the torn intake at all!
That's where the PCM comes in with "substituted data or compensation" to try to keep the engine running.
@@mikechiodetti4482 amazing! Are you a Nissan engineer by any chance?
@@scientist100 all ecm’s can do this actually, at least to a point…
Cooked cat with all the trimmings 😅🤣😂
You ever think, damn im a good mechanic? You should. You are helpful to other mechanics thought processes
Obviously, the customer never mentioned the car running poorly for awhile. They just noticed something wrong when it finally threw in the towel. 😂
It must be a PITA to work with one hand while trying to film. Thanks Ivan we appreciate what you do.
Wow, multiple issues to deal with. Verrry patient diagnosis comes through in end. Another nice job Ivan.
This was a true problem avalanche starting with one problem snowball that got rolling……Not only did you find the bad harness, you found the real cause. Well done.
Well that was different! The fault really was practically at the end of the line lol. Fixed in the end and I am sure everyone involved learnt something new, including us; the viewers.
Thank you for telling us; great information.
Another problem car Ivanated! Thank you for the many lessons you teach.
Wild. Cat was clogged so they floored it till she had a melt down. Classic
Yup lol
No way I could do all that diagnostic stuff..it makes my brain hurt just watching Ivan sort this all out ..another great job Ivan.Thanks
Outstanding work Ivan! I appreciate the preparation before you even leave the shop. I do similar work in the marine field: EFI, joystick piloting (thrust vectoring), autopilot, radar, etc. The excitement of laying your eyes on the the problem after diagnosing is addictive. The guys in the shop usually know I found something significant because I cant help but laugh out loud.
Your videos help me refine my diagnostic methods at the marina. One method in this video I want to use is measuring current at different points to find the short.
Thank you for the hard work you do in making these videos!
This is what happens due to poor maintenance, torn intake boot probably set this series of events in motion, leaned out the fuel mix, clogged the cat, then exhaust leak melted wires. This owner gets the Darwin Award. I hope this taught him/her a lesson, but probably not. Hefty bill, aftermarket sensors are never a good idea. I learned THAT one the hard way, my wallet is still in recovery mode from the parts cannon. Nice fix Ivan, love your logical approach, already had a plan set before you even saw the car.👍
I knew there had to be something else - over 20 min video to fix the melted loom? Great overall diagnostic, Ivan! Seems this car escaped maintenance until it failed - easily repairable issues finally plugged the Cat, which cooked the wiring and started the puzzle - quite a domino effect 🙂
The parts cannon only added cost and complexity / trust issues to the problem - they should have called you before they did all that, but back then, they were not yet out of parts to replace 🙂
Very interesting chain of events with a bunch of variables - plus the parts cannon factor. Nice job Ivan!
"Stay away from the parts cannon"???! Why? We wouldn't have any PHAD diagnostics to enjoy! 😆😉
It all makes sense now, well done! 👍😀
Spot on Ivan. Plugged cat cause exhaust leak right at the wiring harness.
6:33 probably best to de-pin the connectors and use a few layers of heat shrink. then again, it's a pile of pewpie, so "tape it up! tape it up! tape it up! Ooo-Ooo-Oohh! lol
sing that to "KISS, lick it up" 🙃
thank you very much for taking the time.
Right on Spot..
Fun case Study..
And thorough Diag..
🤞🏻
This was a great one in the sense that the fault was actually a symptom of the actual fault. Nicely done!
Automotive constipation. Well stated! Your last few sentences told the complete story.
One of my observations is your approach to the problem; you were actually right about the fault in the first paragraph (part 1), where most others would go along with the 'parts cannon', which meant a 3 week (if I remember) wait... One critical element is that it is an extremely rare event that 3 sensors 'fail' together, and had that in mind all along... ...so, as you did, look for a fault which was common cause to all of those sensors failing, using a wiring diagram. With the assistance of an oscilloscope, comparing with waveforms issued by the manufacturer, it turned in to a quick diagnosis. Just unfortunate that the original OEM sensors (probably quite ok) were disposed of...
I have to disagree with your "most others" comment, any tech with at least one brain cell would see all those fault codes and start looking for what is common between all those sensors.
Replacing sensors instead of diagnosing the fault is what got them in to trouble.
Unplug the easiest sensor and check at least for 5v reference and ground would have been next for me.
Then you discover a missing 5v reference and start looking for why.
Using a test light and amp clamp was clever, I like that and now it is another tool in my arsenal.
This is why I like to watch these videos, at 63 years old I am still willing to learn.
@@Stambo59 Yeah, I see. Best put as 'some' others.. An earlier comment was to use the ohm-meter across sensors, comparing with OEM replacements, but the oscilloscope gave the most diagnostic detail...
@@jamesatkinson6480 the scope will certainly show that the sensor is not working but a simple volt meter would be much faster to show the missing 5v.
Sometimes getting back to basics is the best way for me, but I learned my craft when the average tech did not have access to scopes and scanners.
Always a pleasure watching you work! 😊
Coming to Los Angeles anytime sooooon ???
If you do, I’ll be the camera man while you do your magic
Clogged cat? Explains the wires melted. Cool! Gonna be expensive! Nice your diag about cat was correct! Great repair! Friends had a EGR issue do similar damage to plastic intake.
I remember a few years ago, Eric with South Main Auto made a video entitled, "Test don't Guess." I really don't understand why people just don't take the time it took you to simply diagnose the problem. If I was the owner of that car and I saw this video of the car sitting at the shop for 3 weeks I would NOT use that shop again. I would have never thought that a plugged catalytic convertor would have caused the melting wires. Renault has owned Nissan for years and I just figured the problem as Scotty Kilmer says. Great video!
Very few people want to do any critical thinking. This particular automotive shop obviously did not want to do it. They just wanted to guess and just replace parts not diagnose. Hence, people like Ivan exist. Where would the rest of the world be without people like Ivan? Thanks Ivan. Hopefully you inspire a few of us to start using our brains!
Excellent diagnosis and secondary symptom diagnosis. It's a mystery that they didn't know the cat was plugged, unless everything happened at once.
You definitely forgot to make that happy cry, whuhuu
Ivan. You can purchase cables that go up to 700 deg C that are used in ovens.
You need to work harder because RAINMAN RAY is out of action.
Is Rainman Ray out of action, or now having more time on his hands for videos??? Maybe Ray can hire himself out to do videos for other automotive channels that want to go on vacation!
Thanks Ivan for the step by step of working through an electrical issue. Very informative. Thanks for sharing !!
Great diagnosis. Almost bought a nearly new Sentra back in 2017. It was at a main dealer and priced pretty low. It drove great but we could not agree on a price. Glad I didn't. Instead bought a 2016 Elantra. Bought it for less than $11,000, my son now owns and is still going strong with over 100,000 miles.
Awesome as usual!...I really enjoy your videos Ivan...please don't stop!👍👍😎
Great Job Ivan! Hell of a find!
IVAN, thanks for taking us on this diagnoses journey AWESOME approach and logic thinking. cheeeeers
Pardon me for being cynical, but I don't think I'd sink too much more money in a 14 year old Sentra with a CVT, just saying.......
In a more serious tone, that was excellent work, Ivan!
In my area we have trans shops that "aquire" a large number of cars because people could not pay the final repair bill.
Job well done on a very erratic Nissan. Your accurate assessment on the cause of said wires melting was right on target. The sound of the exhaust while accelerating was a new experience in the realm of space travel. Nice bit of detective work in narrowing down the list of suspects. The cam and crank relationship is a compulsory part of the prognosis bringing the computer into direct involvement in fault finding. Ignoring an overheated cat 😻 is certainly fraught with problems that seem unpredictable in the beginning.
Great job . Always remember you can't polish a turd.
I started this video thinking I would ask someone in the comments how to do generic OBD on my new PROS...only to watch you do it right here. thanks again Ivan!. so far a good tool. And yes, a great video. I learn every time.
Thanks for the video, great work solving that one.
It’s interesting after a little investigative diagnostics it will tell you a story on the car. I’ve had a few of those . Good job on the fix.
Good find. Nissan has forever had cam/crank sensor and sensor harness issues. The oe sensor fails, heats up the wires and usually shorts out just like this. They offer a cam/crank sensor kit that comes with both sensors, and abt 8" or so of new harnes with connector to be replaced.
I like the advice about OEM electrical parts... Buy the best you can afford and cry once.
Nice diagnostic and detective work there.
Again great job 👍
Great job!! thank you for the awsome content!!
Another brilliant video
Absolutely fascinating video good job there buddy.
Great diagnostic my friend.
0:01 Love this channel. Right...back to the video ;) Big love from Australia.
some people like to drive around with the money lite on and the domino effect goes down the line. like taking out the CAT!
Great job Ivan, you got this!!!
Just when I thought I was "done"...nope lol!
Awesome video as always 👍
great your videos! listening to the sound of the exhaust I think it is restricted and that is why the ckp and vss harnesses overheated
Reminds me of a ford ranger I had a couple months ago with a 2.5l 4 cylinder. Valve cover oil leak had completely eaten the insulation off the wires going to the cam sensor.
Bravo Ivan!!!
You'd have loved the completely melted fuel injector wiring harness in a Chrysler T&C I had to deal with. The harness had fallen down and touched the exhaust manifold snd completely melted all the wires together. I wound up cutting out about four inches of the harness and splice all the wires back together. Had to melt them apart to where I had lots of bare copper wires which I cut out the melted section and spliced the wires one at a time until all were fixed. Yeah the harness was still long enough. The car ran great again after that.
This manifested itself as a random misfire then after a particularly cold night it became a really really bad multi cylinder misfire.
Thanks, well done, you tracked it down in a logical procedure, but there were multiple other problems, which you also diagnosed.
Must be difficult doing an outside call, you have to be self sufficient.
The shop owner might have put the battery on charge for you, before you came. Hope you put in a suitable invoice, do not sell your skills short.
From what I remember about wiring near hot areas is the harness is not supposed to be twisted, the individual wires get a fiberglass insulation and then the harness gets a heat shield. This should work for the lifetime of the vehicle.
twisted pairs are often done for impedance and noise shielding.
Excellent
Well done.
We are SO FORTUNATE to have your tutelage. It's as good as any classroom, maybe BETTER as it is real; an investigation of an actual unknown cause. Add in you really contort to yield excellent videos in sometimes incredibly difficult settings. Yeah, you generate CZcams appreciation and certainly you gain future business.... but you DESERVE IT ALL. Provide what's needed and receive rewards.
THE BASELINE, BOTTOMLINE FOR ALL TROUBLESHOOTERS IS YOU CAN'T VIOLATE THE LAWS OF PHYSICS!
cloth type of heat sleeve instead of metal would be better. Had a dodge Caravan last week needed a crank sensor but no OEM available from dealer or suppliers so chose a NTK and seems ok so far and fixed problem. I will say at least they are proud enough they had a NTK logo sticker on sensor most don't even admit who made it once box is gone.
I have a 2004 Nissan maxima that hasn” been cranking with no start since December last year. Total of 3 mechanics took a look at it and can’t find any issues. Fuel, spark and air looked good. I’m running on my last leg with it. Narrowed it down to being wire related but no luck solving.
Great work very well done ‘ luv your channel ‘ I am a car technician so I know what it’s like doing your job ‘ had a Honda with a shorted 5v reference turned out to be a gearbox speed sensor had shorted because of gearbox bearing had failed and worn into sensor also had no coms with pcm , tcm ‘ keep up the excellent work
Enter high temperature wire sheathing has options that are not metal conduit. Fiberglass or silicon probably insulate from heat better than metal.
It all came full circle in the end. Crazy!
🤣😂 " Honey, there goes Ivan passing by again in his custom exhaust Sentra"
On the road I don't know what wiring repair stock you take with you. To keep the two critical harnesses away from the heat you could make them longer and reroute, but this would require harness making supplies. With limited supplies the only suggestion I would have is to use another larger piece of plastic high temp convoluted tubing to cover your repair. It does provide some further protection, but its main purpose is to provide an indication of high heat. So in a way it is sacrificial. If someone other than yourself is looking at the vehicle you can ask if they see any melting of the outer convoluted tubing. If so you know it is getting hot again .
Nothing like well made poorly maintained vehicles that nobody cares about until they won't start to hone your diagnostic skills. Good stuff Ivan.
tech ivan=oem parts only 100% job done
Wow! What a project this is turning out to be. The list of repairs needed just keeps growing. It seems that the owner of this car literally ran it straight in to the ground! And you know they would say something like "it ran fine before I brought it to you". SMH.
good diag and fix, there, @20:11 I see the air bag light blinking. there is a way to reset that with just the key to the car.
What a great video Ivan! Excellent class to me on how to attack a short circuit, I learn a lot Ivan! I like the way you used the current clamp! I need to learn more about that! I bought the DVOM that you use but it does not read me frequency! Maybe I don't have to connect the negative test lead! I've had a lot of short to ground problems in that car usually when the corrugated tubes are damaged due to heat and wires touch sharp edges of the engines but not in the area where you find it! that was awesome! Thanks for sharing brother!
Thank you!
I guessed exhaust leak in part one causing excessive heat on the wiring...first time this year i was right. Was it bull💩 luck....maybe. Ivan, your knowledge is truly impressive and ya, that car runs like crap. Poor maintenance and/or poor quality.
thanks for this video
lmao didn’t expect that car noise on the test drive
excellent diagnosis, repair and master explanation all very well detailed as an elite technician 💪 Your videos are very interesting and those cases too, we learn a lot from you in each video. Blessings and greetings from the Dominican Republic ❤🤝 In a video of yours on your channel you showed a cylinder pressure sensor that you build and sell and I saw it as very interesting. I even told you in that video that I would like the two sensors that sell the complete kit of each 1 and how much would the price be with shipping to the Dominican Republic! thank you 😎
I like the process of using the amp clamp as apposed to piercing probes. Could you have de-pinned the connectors and used shrink tubing on the wires?
Wow, engine couldn't poop lol. Getting new cat fixed its woes!! At least you got your diagnosis correctly!! Great job Ivan. That engine sounds terrible!! 🔥
Well Done
Easiest solution should be either , asbesto wire sleeve or a fiber one , they are better heat deterrent than metal. Metal actually gets to be inside a convection oven .
Yeah, my thoughts too. That metal sheath is a heat magnet.
Original setup was doing fine until the exhaust got too hot due to the cat being blocked.
OEM Dilithium crystals, there is no substitute!
Great job there; shows the power of radiant heat; that exhaust manifold had to be cherry red when the damage was done; the manifold should have an exterior baffle to block the radiant heat from over heating nearby parts; sometimes mechanics will leave it off; "she'll run just fine without it" :) If missing; easy part from a salvage yard; Enjoy your videos
Ivan loves to rev cars up.
Channeling my inner Scotty Kilmer lol
One thing I don't understand: if someone puts in a new part, why don't they actually verify that it fixes the problem before closing everything up? If it doesn't fix it, why not put the old part back in??
Great question Jessica!
The suspense when you were cutting the shild was killing me.
1. Intake tube has leak. 2. Leak gets big enough that computer control of mixture is lost and the engine light comes on. 3. Continued driving with misfire and/or lean condition damages CAT. 4. CAT melts down and restricts exhaust. 5. Restricted exhaust overheats the exhaust manifold and melts wires. 6. Car won't start. 7. Customer reports that car ran perfectly and now suddenly won't start.
All of this could be avoided by finding out why the engine light came on in the very beginning. Maybe that engine light is no big deal. Maybe it is.
Yup that's about right :)
I would have been subject to that heat resistant wire loom from the get go. I'm out of cars for a while now, but I haven't seen it installed factory. I could be wrong. I use it at my work with DPF system wiring. Great job as usual.
a good visual inspection at first sign of a possible short, should have caught the meted loom to (transmission was it?) if it got hot enough to melt that which was further away from the metallic flex.... then the wires inside the metallic are likely chooched.
OK, I have an unfair advantage at my age and past experience with electrical, electronics and more. but still 😒 although I've missed plenty of things over the years.
you would have hoped for a code related to fuel trims prior to the meltdown
I like the use of a low wattage bulb and I do know they don't heat up like a stop bulb or fog/head lamp bulb, but keep it off the carpet it could cause some melting of the fiber of the rug. Better safe than sorry, not that this car was premo in any way. As Jose Silveira said in a sense of poor maintenance cascaded to cause the other ills of the car in time. The old adage pay me now or pay me more later. The mindset of some people. Great job I love the diagnostic procedure perfect.
You might look into "self amalgamating tape" for this type of repair subject to high temperature.
It's non sticky tape that bonds to itself and forms a continuous wrap of silicone rubber in a few minutes. You'd need to get a thin version of it.
Great video Ivan! I do have to point out that this was a pretty straight forward diagnosis as far as the no start is concerned. You already had a feeling it was going to be a 5 volt reference issue from the codes and looking at a wiring diagram. The fact that in 2022 some shops cannot diagnose a simple short amazes me. This same issue could have happened on a 30 year old vehicle. No matter how old you are vehicles have had electronics for the majority of everyone's career at this point.
Wasn't really a "simple short" ;)
Some shops still cannot figure out if a battery is good or bad; and those have been around for a while.
Nice
Aaaah. I see why you ended pt 1 where you did. Lots more to the story. Thanks for the great videos.
It’s admirable that you include your own mistakes like forgetting to plug in the MAF and that intake tube. You certainly didn’t have to, so it lends to your integrity and credibility. You’re just a good dude, Ivan.
Hah got a bit rushed there at the end... Didn't expect an avalanche of problems 😂
Nice Save,Wonder how many Nissan's ended up in a scrap yard because of this wiring problem, This shows sometimes the problem is literally at the end of the rope, Great Content 👍🇺🇸.
most common car at the bone yard they all need transmisions
@@juanrodriguez-ry6yt I have heard that, Any manual transmissions in those years, I like selecting my own Gears.
The old 5 Why analysis, to get to the actual root cause of all those other failures. Great video as always, love these parts cannon fails videos. Also love bashing Dorman, I hate their stuff, always issues.
thanks
What a cluster f**k. Great head scratcher though.
I would extend all wires and reroute around away from exhaust manifold...its hard to see where it terminates...also could attach wire to heat shield to chassis to act as a heat sink