In this video we diagnose a vehicle with a crank no start. The cause of this fault will amaze you! For Business inquiries (Not for technical questions): Diagnosedan@gmail.com
Hes one of a handful on RU-vid that are at the top of their game. Never ceases to amaze me how many times he diagnoses it correctly, oh that's 100% of the time, Dan is the man
That truly was a great diagnoses Dan.... I am also a mechanic of over 35 years in the trade and I don't think I would have found that one, well done my friend that car means a great deal to the person that owns it as without out his car he would be a prisoner in his own home, that car might not be a lot to me and you but it means freedom to him and his family. Great to hear you gave your labour for free you are a good man..... well done my friend and best wishes from the UK 👍
Dan I'm a 20 year master technician and still learn something new with every video you put out. You are a diagnostic God. Thank you for sharing your knowledge
When I worked on Z's (Nissan Z's) in California; honestly we repaired these issues by plugging in new components; one after another. It worked; i've got to say.
I did wonder if the pins were different but that really is unbelievable. I guess both of those Bosch sensors were from the same production batch. Without the old sensor that could have gone on a while longer 😁 Very frustrating and needless time and money wasted for everyone. Diagnosis for free guarantees a place in car heaven for you. Great work 👌🏻
Years ago, another video mechanic said that it is always preferable to replace the crank position sensor with a replacement from the dealership. Seems he was correct.
@@slasher9883 The dealership would immediately know something is wrong with the part as they replace more of those parts for their cars than anyone else. It’s a matter of volume and familiarity with their cars. I had a similar no-start issue and I had narrowed it down to crank position sensor and another sensor. The dealership parts guys helped me out by telling me for every one of the other sensors, they sell a hundred of the crank sensors. No guarantee, but they were right.
Hey Dan you are a saint. My step dad was in a wheel chair and trying to get by on a 1000.00 a month American dollars per month!! He ended up with cerebral palsy from birth and was crippled in the chair. So because of this the American system works like they just don't give you very much if you have never worked in your life. Had he have worked he would have got about 1600 a month. Unfortunately his fingers were crippled and the only thing that he could do was pack O-rings in kits for a company called Clark equipment. They paid him 3 cents per kit. Needless to say we were very poor growing up. When they never forget my dad would have been happy. You're a good man Dan
@@Diagnosedan So next you're looking at negotiating your per-unit testing price? Good luck with THAT!!! This was a HUGE eye-opener for me, for which I'm WAY GRATEFUL!!! Your tenacity and dedication is BEYOND superlative! Sure, it helps to have all the necessary TOYS, but in lesser hands, that would NOT have been sufficient! WAY to GO, Dan!!! So - for one: I'm simple-minded enough to have thought (for YEARS) that if it wore a BOSCH label, it was FINE STUFF, against which all other manufacturers' products might be measured. REALITY CHECK!!! For two: your work ethic should be taught en masse -- so many youngsters today have NO IDEA AT ALL how things work in the real world work place, or what it means to wrestle a problem to the ground NO MATTER WHAT IT TAKES! For three: the tachometer tongue-twister: just call it a tach! (just like TACK) Old school. For four: THANKS again for the INSPIRING tale!
I watch a South Main Auto channel and he had the same problem with a Honda speed sensor cheap chinese made after abit of time decided to replace the part with a genuine part from the dealers bingo it worked so well done to you for taking the time to sort it for the customer and you will store that diagnosis for the next time shame on Bosch for not checking their products
@@Diagnosedan I diagnosed a Nissan Xxtrail with faulty cams sensor and lack power purchase a new one from dealer engine wouldn’t start installed old one engine started, new original sensor faulty ,
You are an amazing technician Dan. Such an interesting video. Bosch should pay for all this and also recall all poorly manufactured sensors produced. One of my favourite videos. You can tell by the way you recorded this that you really enjoyed it as well🤝
There's not many people who would have been able to find this. This could have been one of those "unfixable" cars or accidentally fixed with dumb flipping luck, without understanding what is actually wrong. You're the man Dan 😊
The engine still ran with the old sensor but wouldn't start with the new. Why wouldn't you be able to figure that out? He probably could have avoided all of this and put on an OEM sensor to begin with.
Dan I would say the electronics in the module would recognise rpm on either negative or positive edge trigger of the signal but not both. Can be worked out from waveforms perhaps? Incredible company like Bosch could get wires wrong, possibly incorrect part number etc.@@Diagnosedan
Dan I just want to say is thank you for the great video more then anything not charging the customer that even made it the best video ever. Due to an accident I am also handicapped but as a technician that I was I wished I could have done more for the handicapped just because they have a lot of outgo on their end from their income and no one to help so that they can survive and live at a little better than what they are now believe it or not just what you just did help them out the most anybody could have ever done God bless you for that and I wish more people were like you keep up the great work keep putting out these great videos I love them it gives me something to do and once again thank you from the bottom of my heart
Great video Dan! I’ve been down several rabbit holes because of incorrectly manufactured parts. It’s part of what makes this industry so frustrating to work in, but I love what I do. Thanks again for the awesome video!
And when you see local parts factor companies delivering to main dealer stores to get a cheaper pattern part quicker than oe it makes me sad that some poor dude is paying dealer prices for aftermarket parts
@@-robster-robster- it's happening a lot more frequently than you think, Euro Car parts sold the complete 4 wire Green coolant temp sensors on the day i rang for 1, when i arrived to collect mine, i witnessed a local vw/ Audi dealer driver collecting the entire stock from them, giving me no choice but to go there, and PAY THEIR PRICES!! worse was to come, it was a cheap Chinese obviously that failed a few day's later, when i returned it to the Audi supplier, was told it cannot be returned because it had already been fitted, and they couldn't resell it in that condition!! 🤥
How can BOSCH make such a mistake? I am so glad that you sorted it out for the people well done Dan, for sticking with that problem a lot of people would have charged them the earth and not been able to fix it.
Not necessarily a Bosch issue. I have had the same thing on a clutch pedal sensor on a BMW. Imagine that for some reason you have 2 very similar parts that are physically the same but wired opposite because of the ECU they are connected to. 10 yrs after the car is not sold anymore the part numbers get superseded and no one remembers why there was 2 different part numbers and both get superseded by the same part.
If you look at it from another perspective, it is good that the wired connector is only for a signal and not for power. Otherwise, the ECM would be fried.
So much patience and determination!!! Formidable! A real winner! For three months I have been looking for information about the EGR of the Vw Golf 6 1.6 tdi. Now I know absolutely everything about him. The problems that arise, mechanical, electrical, working parameters, every electrical connection, absolutely everything! Good luck! We are waiting for new episodes!
Great video!, thanks very much. You were actually right, I never did expect that l, but hey it happens. In the words of Eric O “just because it’s new, doesn’t mean it’s good”. Good on you for sticking it out to the end. Keep up the good work 👍
Love the video - glad to have found you - I was a commissioning engineer on control systems for a few years and this brings back those memories - when you check it all out and cant find the problem and you go round in circles a few times trying random things , anything, until you eventually solve it, then try and explain to the office why it took you hours to get there - made me smile - thanks !
Dan, I am totally blown away by your top-notch professionalism, work ethics, experience, superb skills and above all your relentless perseverance and passion for the trade, not to mention dedication to your customers for lack of a better term. What a blessing it would be to have you take a look at my car and consult you from time to time on some car issues. Keep up the great job!Shame on you, Bosch!You need to pick up the tab for all the trouble!
Great diagnostic again Dan. I would never think of a Bosch part to be that messed up. But you fixed it again. By the way once this Pandemic and invasion is over I'll pay for all the expenses to fly out to you and help you for free of course , that is if you ever need anybody. P.S. I've been working with diagnosing and fixing just about anything on wheels an on water for the longest time and noticed a few parts that are counterfeit with brand names on them. Sign of the times I guess.
Only have to swap the pin locations in the connector. Simple fix once you know the problem. Like when the 70 year old machine quit in a factory and nobody knew how to fix it. They called an old guy that used to work there and asked him. He came out with what looked like a doctors bag. Laid out 3 things. Stethoscope Chalk Big rubber hammer Walked around and around the machine listening occasionally with the stethoscope. After few minutes, drew a big X on the side of machine. Picked up the rubber hammer and gave it a big old whack. Machine sprung to life!!! Wrote up a bill for $18,000. Manager screamed about the fee. Said he wanted itemized bill as he wasn't paying him for hitting it with a hammer. Bill said: Labor---$10 Knowing where to hit it---$17,990 They paid the bill!😂🤣😂
Yes fake parts are a problem, but what i think happed in this case is that Bosch buys these parts for older cars from another party and sticks them in a Bosch packaging without checking.
A French car with Italian electronics, what can go wrong? Seriously, I wouldn't be surprised if Magneti Marelli originally used some Italian cranksensor that's fully identical to a Bosch but with some connectorpins swapped. It wouldn't be the first time an Italian company used a "trick" like this to sell their own product. So I don't think it's a Bosch problem but rather a Magneti Marelli problem.
shows there charging way too much for those faulty so called premium parts... i wonder how are they verifying that the parts made from production truly actually work as they say they supposed to....🤔 for the cash prices there being sold to consumers for...i get it that without having a skilled tech with the wear with all to do what this mechanic here has done ....its same thing shop would be telling consumer X Y Z and the consumer would be in essence throwing money at the vehicle with out there being any real meaningful input to solve the problem... guess sometimes less known name brand parts work more efficiently then does the known name brand auto parts guess folks are participating in a crap shoot swhen it comes to purchasing some parts i suppose ...
Just discovered this channel recently, love it! This is what mechanics is all about. Pinpoint the problem and fix it. Not only fix it, it was fixed after installing the "cheap" sensor, but also find out why the Bosch sensor didn't work as it should. Keep up the good work Dan, you've got a new fan here!
Thank you Dan. Your video confirms the quality of parts being sold. It is very dangerous if weak parts are supplied for engine or brakes... which can be hazardous to the engine or ones safety😢
One word: MERCEDES!! ;) But at least the Mercedes was flashing the Crank Sensor code lol... Your Peugeot gave no clues at all! Now what signal was the signal generator putting out to be recognized by the ECM? Surprised that it worked because the ECM seemed very picky about the signal 🤔👌
I have that same tool dan has. Autosim pro. It has presets. Just hook tool up to battery, go under sensor sim and choose crankshaft sensor. There is Hall effect and inductive choice, select inductive for this application and play with settings until you get read out on data pid
My '94 BMW 740 crank sensor started being intermittent as well, with no code. Finally it too quit altogether and wouldn't start. At the time I didn't even know it was the crank sensor until I had to try to get the car running again.
I suspect it's just that the ECU is designed to trigger on a specific waveform, for example a rising edge followed directly by a falling edge. There's probably a filter and/or waveform trigger in the electronics to eliminate noise and false triggers, which then only passes on a clean pulse to the rest of the ECU if it detects the correct waveform. And with the BOSCH sensor presenting the rising and falling edge inverted, no signal would ever make it past the ECU's input conditioning. Which would also explain why there was no fault code set: the ECU never even knew the engine was supposed to be running.
Ivan , the ECM if it could read the Bosch sensor it would think the engine was turning backwards when cranking with the reverse polarity sensor , if that makes sense , not come across a code for cranking backwards yet 🙃
Hi Dan, great video! Brought back some memories as I had the exact same issue a few years ago on an old renault scenic. It had a bad crank sensor (also inductive 2 wire, the ones on top of the gearbox mounted with 2 M6 bolts) when you buy a new one most of the time it comes with a new connector they want you to solder in to the cars wiring. Probably because these connectors go bad easely. I don’t remember the brand, but they also had the colors switched on the new connector and after installing we had a no start. I was looking on the scope for full 2 days until I found that indeed the signal was inverted and the ecu did not see this as a problem but just ignores the signal. So when I knew this I just had to switch the 2 wires and the car started right up. Very very frustrating! So thanks again for this video, I’m sure it will help some people out. Take care! Karel
I Love these video's especially when it comes to a problem that stumps the professionals like yourself. Bad parts are the plague of the future I'm afraid and your video showing the diagnosis and the use of the Pico scope to help identify these nightmares is a Blessing to all of us who don't have the real world experience that you do. Thank you so much Dan for taking us with you on these journeys into the unknown, you truly are a great teacher.
Dan, Just ran across your channel and love it. There is a channel by Mr. Carlson's Lab and he is a genius when it comes to electronics (radio, etc) and after watching several of your videos, I must say you are a genius when it comes to automotive diagnosis. Very educational watching you chase down and fixing problems. Please keep doing what you do best.
Whow, I’ve never been into diagnosis as was way above my head but you provide it in such a simple way it’s easy to follow. I’ll be more sceptical of branded parts in future if replacing and no cure. Thank you and brill sorting that car out for the owners, their mobility will have been so important for them 👍
The very best automotive channel on RU-vid by far. Pure entertaining enjoyment and highly educational. Thanks for taking the time and patience to share this with us. You are a true leader in your craft....!
Scary, when used good OEM parts and don’t work, but it happens. Thank you Dan, appreciate you. My prayers for you and your family for abundance of blessings. Stay safe peace
What I learned from a bunch of friends who are fans of french cars is that you should never mix french cars with Bosch parts. At least not when it comes to ignition related things. I guess they were onto something... Edit: Looking at the wave forms, it appears as if the polarity of the Bosch sensor is reversed. Edit 2: Oh, you also noticed that... Oups.
I sure appreciate that you did this process all over again. I always learn a lot here. Oh my goodness, that was it? Wow. I don't want to give it away but that was very interesting and yes, who should pay for that? A great question.
OMG what a brilliant feel good video bless you Dan for helping the owners. I felt like I was watching a Hollywood movie at the edge of my seat. FANTASTIC!
Wow, so well done Dan and credit to you for not charging a disabled customer for all that time, very honourable. I now work for a charity that has vehicles like that and the replacement costs are outrageous considering that there's not much in the back apart from the ramp and some chair attachment points. Some do have lowering rear suspension, but hard to justify the phenomenal prices!
My guess would be because it’s all custom work and the parts are small batch plus maybe the huge costs of getting the vehicle crash test certified again? And of course since insurance probably pays in many instances, that will immediately make the costs be higher.
@@paulhutchins6019 I didn’t mean individually vehicle approved. I mean that overall model car retested after the disability system kit was designed for sale.
I liked your video and I'm going to watch more of them. I ran across your video doing some research for a 1998 Dodge Dakota occasional stall problem. As a former California state licensed smog mechanic (1990) your video reminded me of the good old days when I worked in a shop and whenever they had a vehicle diagnosis which no one could figure out, they would give it to me and I would solve it in no time. It's been a while, but I know I'll have no problem with the Dodge... and I'll enjoy watching some more of your videos... thanks for the great entertainment.
I would be happy to come over and crank the car for you for free, your channel is one of the most interesting automotive content channels. Keep up the good work. Maybe the sensor has been magnetised in the opposite polarity, put a compass needle next to both sensors and see.
Awesome video! Thank you so much for showing why the Bosch sensor was failed and not just the fact it was failed made total sense. For the few years I’ve been in the trade I know unfortunately we can’t always trust new parts. Even oem sometimes. New Parts failures exist. Good job again Dan!
Gentleman to all of us that happens from time to time, in my case many manufacturer honor the claim, I have to honestly honor your integrity, blessings to you and your love ones, from the endless summer paradise Puerto Rico Jesus Torres.
That was just absolutely amazing but makes alot of sense. the amplitude can just be off ever so slightly to cause an issue and this would include other sensors as well. You certainly have the equipment and knowledge to solve these issues. Great diagnostic video.
It's nice to see you do some more complex diagnostics, even though I understand how it might mess up your shop work flow. I was surprised this crank sensor is the old style VR sensor rather than a hall effect sensor. What an interesting final diagnosis.
@@TyroneMaye Variable Reluctance sensors produce their own voltage by placing a magnet and a coil beside a steel toothed hub that rotates by, and it produces a sine wave that varies in amplitude and frequency. They have two wires. Hall effect sensors have at least three wires, they require input voltage and ground, they have internal electronics that produce a square wave from a rotating magnetic strip. They are more expensive, more delicate and more accurate, especially for slow rotation rates. Wikipedia has more detail.
Great video Dan. That is so mess up that Bosch got the wiring reversed on the sensor. Great job as always. I do enjoy to seeing your approach to solving issues like this.
Great work Dan, I had a similar experience with a V8 Audi 80 for a friend collecting dust for years, using the oscilloscope function of Carman Scan VG+ it turned out the timing pin the crank flywheel was broken.
I stopped buying Bosch a while ago when the quality dropped. Maybe it's just for aftermarket parts, with OEM products still being made in house but aftermarket, source out production to cheaper manufacturers I reckon!
Great video, it just shows you how crazy the aftermarket parts world is with bad parts, fake parts and lots of quality issues. We are buying used OEM parts to replace does that fail. You at least get a much better part at a lower price point.
Funny thing I was mentioning this to my students today about a magnetic pulse generator being reversed polarity. I've seen that before several times but those were due to someone replacing the pigtail in the harness. One was on a Caddy with dual crank sensors for redundancy but with one signal inverted the ignition module would not process either so crank no start. You would only catch this with a lab scope but you need a known good signal for comparison. Another was on a GM 3.1 were the wires were crossed and it acted like it was out of time. It would fire but not run and then foul the plugs. Good find. I would not have expected this from Bosch. I usually try to use oe sensors whenever possible.
A very interesting video, and very well presented. Subbed straight away. As a mechanic in the 60's and 70's I'm amazed at how ridiculously complicated cars have become. I left the trade in '76 and didn't get involved with it again until I retired from working eight years ago. Since then I've watched all kinds of videos of this sort and finally found your channel. You have a great way of explaining things and I'll be binge watching all your content.
Well done Dan. Just proves, despite the evidence, there are good people left helping people when they need it. I'm really glad you did the test inverting the signal from the Bosch sensor at the end for proof of the hypothesis. Great video, these are the jobs I really enjoy.
I have also been in this industry for 20+ years and seen the new parts more and more times being defective. It is hard to do your job when you expect the new parts to be good and they turn out bad. Great job, love your chanel.
Good man Dan, your a diamond of a feller for helping others who are in need and also teaching others the tips and tricks of the trade. Great videos Dan..Thanks mate.
Awesome👍 Thanks for sharing Dan👍 It could be easily a part's canon, especially when the signal was making it to the PCM, indeed a very tough one, but you fixed it😍 DiagnoseDan Fixed it Again, Stay Safe Bro❤
another good job, you should upload videos more often, even for simple repairs. it's invaluable learning to be able to watch you solve even the most complex faults step by step. I've been watching you since you had 10,000 subscriptions and you still surprise me, you do it great. Greetings :)
Sure didn't see that one coming. I thought it was going to be something far more plausibly random like an immobiliser switch wired into the aftermarket rear hatch/wheelchair ramp setup, to inhibit starting in case that wasn't stowed correctly! Would love to know what Bosch have to say about this?
Amazing and so telling of faulty new parts. I have ran into similar problems not only with electrical sensors and switches, but also with mechanical parts that were not properly built and failed to work thereby causing me to go thru different manufacturers of similar parts in order to get a correct working replacement. Thank you for posting this video and identifying a problem which was overly exasperated due to poor quality replacement parts.
This was really an interesting one, I started to think that maybe the ECU wasn't properly grounded since I have experienced that once. Sometimes you need to pay a bit to learn a lot more. This is also why I don't fully trust codes given by an ECU.
Yeah. The error codes given by the ECU are only as smart as the ones who designed them. Also ECU error codes require a lot of sensors and other ways to follow and diagnose the engine condition to be accurate. Fewer sensors and methods more approximate and thereabout the error codes are.
Thank you for sharing this one with us all, as always with these type of diags , persistency is what pays off in getting to the end. Not too mention the power of the scope to be able to let you "see" the "why" to the situation of one sensor working and the other not. Appreciate all the effort as always!
When I teach automotive electronics I always bring my old electric guitar to my class to see the phase phenomenon on inductive sensors, it has a pickup setup to invert one of the signals from a pickup, so it sounds like chorus effect when mixed, we use to record smoke on the water using inductive sensors XD, and we can see the signal pattern on the pico. VERY good video Dan, keep this line, I love it!!!!!!!!
Great video. Throughout the years I have seen a few faulty new parts. They are not always cheap aftermarket parts. It is frustrating that you can not rely on the new part being okay. Are we supposed to test all the new parts before installing them? Who is paying for that? Actually someone could start a new business that evolves around testing parts before they are sold over the counter. 😀
And who is gonna pay for testing? I dont think manufacturers have intention paying for something they were supposed to do in the first place, let alone pay somebody else to test their shit. And I dont think customer will want to knowingly buy untested product and then take it to somebody for testing and be additionaly charged for this lol. Thats why you have consumer rights to return any defect product and have another one or money back, and store then returns the faulty part to manufacturer. The only one who is at loss here is car technican who wastes time and cant charge it to anybody, but then again thats why they charge replacements at premium timings so its a closed circle 😂
Great find Dan !, have to admit I didn't notice the inverted signal till you pointed it out. Very easy to miss that one indeed ! I've had this with Bosch map sensors from Euro before. The time wasted on cheap crap parts not only makes you doubt your initial diagnosis on these jobs but also lost revenue on easier jobs. Thanks for the video.
Easy to get caught up in the weird science of the repair, but it is Dan's dedication to making a plan and then working the plan that was the big takeaway for me. “Assembly of Japanese bicycle require great peace of mind.” Robert Pirsig.
You are Master, professional. the gratest of all, i have learn a lot of stuff watching you, thank you so much for these fruitful videos, all the best from Greece, bye bye!!!
