For the Topdon tool used in the video: www.topdon.us/discount/DIAGNO... the price of Phoenix Max will be 10% OFF by clicking the US link European contact: oscar@topdon.com Uk : www.diagnosticconnections.co.uk/topdon-trucks-lorry-van-vehicle-diagnostic-tools Link for the Autel km100 key tool: US: www.amazon.com/dp/B0B31C95GX UK: www.amazon.co.uk/dp/B0B4R86SLT DE: www.amazon.de/dp/B0B4QVH8ZH FR: www.amazon.fr/dp/B0B4QVH8ZH

A brilliant example of why a test light is so important

A perfect example of VOLTAGE DOES NOT EQUAL CURRENT. Well done DD!

Nothing better than fixing a car that came from multiple shops. Great work Dan!

One of the few channels where I'll watch a video all the way through - always something to learn from you, Dan! Great video 👍🏽👍🏽

Wow Dan, excellent example of the importance of voltage testing under load! DVOM would definitely get someone in trouble 😅 Neat Autel key programmer too!

Wow Dan thanks for another great video I'm a junior tech in Africa and I gotta say I've learnt so much from your channel and hope to learn more keep up the good work man

I was introduced to your videos yesterday by a diagnostic friend who subscribes to you. He does this day in, day out and tries to teach me stuff. I am the kind of learner that learns by absorbing detailed information and there are so many videos out there where they talk jargon and do not really fully show what they are doing. I feel like I have learned such a lot from this video. The first one I watched was the Using Ohm's Law as I have an issue with a P0672 fault and also a P2135 fault on a Smart ForFour W454. I learned surprisingly that these two may be linked. I have yet to test and confirm. This video is just so affirming where you reaffirm every time that the lamp lights or the multimeter doesn't and then you connect the two. Although I have a test lamp, I generally use a DMM because I didn't fully understand how to properly confirm powers and grounds. Now I believe I do! At least I hope I do. The only issue for me now is getting to grips with these modern type wiring diagrams. It's easy to zone out with them and go round in circles when you're an amateur. Looking forward to watching many more of your videos irrespective of whether they are relevant or not. Working on the other half's car next with an fan relay issue P0493 and P0952 on the telematics. A garage had said that the telematics one needed a new £1100+ head unit but I am not so sure and there was a similar issue with the ABS where the unit was swapped out for a second hand one prior to my other half's ownership. Whatever happened it rectified it but leaves me wondering it was actually a similar issue. EDIT: Having read a fair amount of comments, I have concerns about whether a test lamp should be used on 5V circuits? One commentator notes test lights with different ratings 50mA, 500mA and 2A? I've not checked yet whether you have a video specific to test lamps but, if not, could you perhaps expand on this please. I don't want to go probing fuse boxes and blow anything. I guess that clamp onto negative and probing any fuse is safe but clamping onto positive, then only probe grounds and NOT touch the probe on a fuse and accidentally power a circuit that might not be 12V - is that what these commentators mean when they say you can blow circuits? If so, that should be fairly easy to remember! Thanks in advance.

I had a similar issue with my Golf IV, i.e., MK4. The alternator stopped working because it did not receive the control voltage it needed because the fuse box had some corrosion. I got stranded with a flat battery. It took weeks to figure out what was the issue and I ended up replacing the alternator in the process even though that was not the issue. I didn't have a test light but thanks to Dan, I do now :)

dan, you caught the automotive electrical lesson of the year by showing the loaded circuit and what it does with a voltmeter on video. i've seen rookies and experts bit by this and caught myself a few times. it all goes back to the basics and understanding how your test can affect a circuit AND how your circuit will affect the test. its got to be complete volta amps ohms to be a verifyable test. kudos !!!

Dan, I own a 2000 VW bug 1.8t with the same style fuse block and I so appreciate your testing explanation. The chats that i have followed say the fuse block on top of the battery is prone to corrosion issues, and this VW has proven that a brass brush and some battery terminal cleaner and protectant will be my best friend as my bug gets older.

This man deserves 10m+ views per video. He always takes the time to explain how he finds the problem, how he's sure it's the problem and even goes out of his way to fix it the right way when others would have just tightened the screw or added a jumper wire. I am a technician and I can say for a fact new parts are not always good nor is something better just because it's newer. Proper diagnostics is assessing the knowns, x checking for basics and cutting the circuit in half until you find the problem or contributing factor. Seriously I can't stress it enough I'd watch any tutorial this channel is putting out- no matter what the topic. 👍👍 Second - to - NONE.

Congratulations on the result! Once again you made a car owner happy! The rule of checking with the control lamp or a consumer, I learned it from you from several episodes! Good luck!

I really appreciate your videos Dan, you really know what you are doing. Now, regarding that Autel programmer, you where lucky. I am a locksmith and I have a bunch of stories about Autel bricking Nissan cars while programming keys.

Thanks Dan! That's actually a super simple tip but a golden nugget! Even with 6 years experience and knowing all this, I'm pretty sure I'd have fallen for that mistake too and this was a good reminder! 👍

Love it, the simple test light defeats the fluke dvom. When was in school(20 years ago) the instructors would drill you to use a meter, "don't use a test light". I always had the habit of using both just for some redundancy in my testing. Love the video.

Another excellent video Dan, Power & Grounds, sounds simple but a lot of mechanics only test with a meter, missing some important indicators, done it again Dan well done.

Great video. Testing with a test light is such a small thing to overlook. They can save you hours and also save your mood. The longer you take to diagnose something, the greater the chance of your ego getting involved in the process. I.E. "I know I'm doing this test right." Then frustration enters and then it becomes a whole big thing. I'm sad to say, I speak from experience on that one. Thanks for another great video.

Hey Dan I became very addicted to your videos and the knowledge passed on is sensational, and very thoroughly explained, please don't stop making them. Thank you very much

Not only do I enjoy your expertise Dan but your accent seems so like home here in West Michigan. Indeed, I worked with many Hollanders in the Tool and Die division at General Motors. But before that, I was and still am auto/truck technician. I consider you as a neighbor. Thank you for helping me become a better diagnostician, even into my late sixties.

I didn't doubt you were going to fix it again Dan. 35 years ago, British Rail had a small resistor in resin with 4mm pins spaced that they would fit in a new multimeter and you could plug your test leads into that. About the size of a third of your little finger. I've still got some and use them. It was to put a very small load on the reading as they were changing from analogue to digital meters and things were all 'over the shop' reading wise with the digital meters, until somebody came up with the very simple idea.

Good video- so many guys like to use the multimeter or one of those beeping testers- A test light is so much easier and more reliable- you only need to find a good ground and then probe with the light - the multi meters don't have clamps on the probes so you need to hold both wires and then try find a place where you can set the display to read it.

I love your videos. You make it all very clear and explain so well. Great point about using a test lamp.

Excellent video on how abs module is faulty due to a current supply problem

Nice video and diagnosis. Ivan at Pine Hollow Auto Diagnostic would be so proud of you for the no parts required fix. 😂

Thanks Dan,even though testing powers and grounds seems easy task,but appears to be tricky.I love the way you checked for power around that bolt and appears to be half space powered, this teach as how corrosion could affect integrity of the circuit in strange way.fantastic investigation.

Amazing work, for real. The way you have been diagnosing all the cars in your videos has inspired me to change the way I work on cars. Thank you for sharing your great skills and knowledges

Best part of the entire video is the funny bits at the end,not taking away the utmost respect for the entirety of the tutorial, well done Dan, as ever, legendary work, keep up this groundbreaking pioneering field that many fear to tread. 🙂😇🥰

Wow, I've never thought of the load that the lamp applies to the circuit being so important. Thank you for this lesson!

Hi Dan, sounds like you might be struggling a little bit for air in this video. Maybe it's time Diagnose Dan had a wee checkup and Diagnosis himself? I am sure it's nothing but no harm in getting checked. We need you around for many years to come so you can continue to make great videos!

Another great video, Dan. Practical, useful and your explanations as to why you're doing what you're doing are outstanding. Best KZfaq Channel.

This make easy to understand something like checking grounds and powers, thanks!!

I was critical of your previous ohms/continuity video Dan but this one gets a thumbs up for showing how not to rely on volts as proof of circuit integrity but to always load the circuit too, a nice example of voltage drop on a unloaded then loaded circuit 👍🏻. There is a set of test leads I’m sure your aware of that load the circuit with the push of a button ( load pro for those who aren’t aware). Ultimately this comes down to understanding ohms law & understanding how a meter works & it’s limitations.

Hey Dan, one thing to keep in mind when adding a key to Nissan, is always programming the original key first then the aftermarket regardless of brand. The reason is that some will lock the original key and can't use it again so you will be stuck with one key again until you renew the original and program them back in again.

Nice find Dan, also I have a km100 and use it for factory keys, which it also does very well. haven’t had an opportunity to try the universal keys yet. I have heard from other techs that they are quality and last, I also agree that the ones I received with my km100 feel very high quality upon initial impressions.

Such a great fault finding tip in using the the test light to load the circuit, cheers Dan for another cracking video.

Thanks Dan - people think I'm crazy because I've got a few diagnostic systems, a couple of nice multimeters, and my favourite testing tool is an old side repeater bulb and holder from a scrap car - this is why 😁

Always enjoy your videos. Wish there were more of them. 🙂

I had similar problem on a older model of nissan patrol. Friend of mine called me to take a look on his car because he had a problem with first start in the morning, especially during winter time. Conclusion was that the glow plugs are bad. Tested with multimeter, everything seemed ok, but the car wouldn't start. Checked the continuity, glow plugs, wires, both of the batteries and relay. After a whole day wasted, the last thing i wanted to try was to change the positive wire that goes from the relay to the glow plugs. Changed the wire, and it was all ok. Later checked the old wire with multimeter and multimeter said it was ok, but under the load it wouldn't deliver the power. It is important to mention that I am an electrician in construction and not for vehicles. This was the first experience with this kind of work and problems of this sort. If I had seen Dan's videos, it wouldn't have taken the whole day, only 15 minutes. Thanks Dan.

Rookie error by previous garage as this is a very common issue across VAG range . Another great video dan and well explained but I feel this was an easy one for a man of your caliber!

Mr splinter !!! Of diagnosis!!!! Thank you for making me what I am today !!!! Without your videos idk if I ever woulda have fix the tons of **** I’ve fixed !

Excellent video and really well documented. I have an abs issue and I also assumed faulty module, this is something I’ve not yet tried.

Rule one of fault finding, check you primary power source. I will now add to my mantra, test the primary power source UNDER load! Thanks Dan, you did it again 👍

Dan, good evening from Germany. As ever, another master class in diagnostics. Brilliant. You may not upload lots of videos but they are gold standard every time. Thanks 👌👌

Super diagnostic just shows basic steps working

Great diagnostic procedures, got an A3 in now with similar fault. Thanks Dan

Dan that circuit test is the perfect explanation of voltage testing, and loading the circuit to test. This is why i have home made test lights with different bulbs to test many circuits with bulbs of different draws. My testlight is digital so it does not load the circuit. I made my test bulbs with "banana jack" ends so i can use them with all my electrical diagnostics kit. Awsome videos and thank you again for posting these case studies.

Excellent tip regarding the test light, I would probably have got bitten by that joint. Might have been a good idea to put a castellated washer under that nut

DiagnoseDan the expert in car diagnostics 💪💪💪 Thank you for sharing

Good job, shotty workmanship on the last person there.

I have just realized that I am stupid. Have ordered a test lamp (similar to yours) But it was a problem to find one with a light bulb, most of the ones I found were with LED lights, they should have +- not just reverse the battery poles, but it went well in the end. I also had to use my brain. You're damn good, it's fun to see you work and think, you're a professional, I'm a hobby amateur. 👌 From Sweden

This just solved a problem I have been dealing with for months. Mine was a loose fuse that I pressed in and the ABS and brake lights disappeared from the cluster. Thank you!

Dan know wonder garages bring their problem car's too you. You make it look so easy.🇬🇧👍👍👍👍👍

I love this underated channel for people that wanna use their brains to fix problems and save time and money

I would LOVE it if that was my issue with a 2003 MK4 Jetta 1.8T. We'll see. Great Video!!!

Under LOAD! Very important aspect! That is a great pointer! Thank you!

I believe it’s called a Rogue Sport in some markets as the regular Rogue is a bigger SUV. Thanks for the great video!

You're looking and sounding good - in the current world situation that's a relief. As a now retired electronics technician, I had fun with the ABS troubleshooting, and you reinforced something I learned years ago, where i was living near the ocean and saw lots of bad power connections and grounds. Not so much now as we're 1200+ miles inland these last 30 years.

As always, amazing Dan performs a thorough analysis and finds a cheap resolution.

Yes, the old voltage conundrum... I once had a side repeater on a Citroen van wing that showed voltage, and the wires all looked fine but the feed wire had a cut to the insulation, allowing corrosion and the wire had burnt to one strand, and the one strand was itself turning black. This one actually lit the test light and was very confusing for a while. Logic won the day. The voltage read ok but the test light was slightly dimmer than normal. Both together highlighted the issue - a volt drop on load.

The importance of using the right tools. I had the same issue with a Peugeot 308cc which came from another shop where they changed lot of parts.

Enjoyed your video? I absolutely loved it and appreciate it more than you'll ever know. Thank you

Yes, I really enjoyed this video, to answer your question! SMA introduced me to this puzzle solving of electrical issues in cars, and I love the intrigue. For me, the bloopers at the end of the videos don't flick my switch, but I seem to be in a minority. I'd much prefer to see proper mistakes made on the job, not in the making of a video 😋 Mistakes are not negative eh. Thank you for your efforts 😊

Well done Dan,very informative. I have eps light on no stop start...I'm gonna investigate this weekend

Dan, you are a Master at your Craft.

Had a car in the shop for a key not working complaint. Turns out one of the keys are original, the other is from Ebay. Using the factory scan tool, I ended up with two keys not working, since the scan tool did not recognize the serial number in the ebay key. Just something to keep in mind when you save money on Chinesium parts. You can see the battery has been recently replaced. 99% sure the previous mechanic forgot to tighten the last nut. Since it's less work to check the fuses, that's probably where I would start off. And I would still have the ABS module connected, so there would be a load on the circuit.

As always Dan, he is an expert at fixing these things!!

Dan, you are a wonderful gift to the automobile family

Great video!!! I remember at Bosch school a few decades back they set us up with something like this. Always handy to have a test light that has a load. A great learning experience to any one who deal with electrics!

Good lesson on using the right tool for measuring power and grounds!

Hi Dan, The Volt measurement with the multimeter works fine. You have to make sure the circuit is loaded. You do this by leaving the plugs connected and performing the volt measurement by means of a back probe measurement. This is how we explain it to our students at school (Graafschap College). The way you show (test light) is of course also possible. It is true that you are now going to switch from measuring to unloaded, plug on plug off. Voltmeter to test light and vice versa. Do you have experience, no problem, if you don't, it can be confusing. KISS method: leave all connectors in place. Back probe where you want to measure. Do this with a Volt meter against ground. Correct supply 12v, correct ground 0v. Furthermore, you make great interesting videos, use them regularly in my classes! Keep it up! Regards Thomas

Yep, the best channel for auto repairs. Very very profi Hats off mr. Dan, the hardest repairs are the simple ones

I've not even watched this but excited when I got the notification. Left it uncleared until now just to make sure I watch. Thanks for your diagnosis

Incredible that the other shop didn’t use a test light. Recently my 2013 BMW 328i showed scary messages about the ABS! A scan with my iCarsoft BMM V2.0 indicated a faulty right rear speed sensor! The Stealership would have charged nearly $415.00 for changing it including part,labor, and tax. For $58.79 usd and a little time to install the sensor job was done, and the wheel was remounted and bolts torqued to 140 Nm. All codes cleared.

I learned something there. Brillant demonstration of the importance of using a test light.

You are the best who is working with electric faults on cars👍👍👍👍

Great job. It shows that to test circuits properly, they need to be loaded. I had my suspicions on the fuse block from the start.

well repaired. A tip. you should apply a thin layer of solder since unprotected copper corrodes over time

Great lesson about loading a circuit.

I’m learning new things every film you make! Good work Dan!

Dan is a great teacher

Wow the difference between the test light and voltmeter was eye opening. Lesson learned

Wow. That was so simply explained and demonstrated. Even I could understand it. Great job, and thanks, Dan.

Ah Dan, you were working on a Polo then I dosed off for a few minutes, woke up and you were working on a Nissan! Stop messing with my head Dan! Great Vid

good example of why voltage drop testing is a very useful tool practice

i fix mobility scooters for a job and i went to one that didn't work and i checked it with a multimeter and come to the conclusion the module wasn't working so i sent it off to have checked for them to send back with no fault found, then it came to me Diagnose Dan with is test light and sure enough within 10 minutes i found a bad connection, so now i have test lights in my van in my tool box and even at home, as for you're video Dan excellent video again thank you

I used to fix copiers and printers and one thing my boss told me all the time was "think low tech before you think high tech". And this video brilliantly shows us why that is.

Thank you! I would have never thought of the advantage of using a test light! I appreciate your wisdom.👌🏾

Great display of it showing voltage, but dropping with a load. This demonstrates why it's important not to touch anything without testing it all first. These are always the weird one's that fix themselves when you wiggle too many things around, and then you never find the issue and it comes back again later. Great video!

Nice to see VW/Audi carrying the same problems from the Golf 4 / Beetle era to the 21st century. That battery fuseholder has been similar from 20 years ago and the vehicles have been plagued by it. It controls cooling fans, turbo afterrun pump, abs and ac.

manual diagnosing champ...nice one bro👌

Seeing all too often similar overlooking after expensive parts replaced and still no fix Great job Danny still I’d love to meet you in person just for a simple hello

Great video Dan, the most basic diagnosis rule should be after confirming the fault, is to check your power & ground feeds... The funn6 thing is, at 11:20, KZfaq played a Nissan Qashqai ad...🤣

Always learning something new from your diagnosis

Excellent video Dan. I don't have a test light like the one used on this video. However, what I do to substitute is that I use a light bulb from a side marker that draws quarter amp. When reading voltages, you can connect in parallel an incandescent bulb with your multimeter. This method insures you are loding circuits being tested. Test and keep in mind how much current you are drawing with your set-up ahead of testing circuits. Thank you Dan, Love your videos.

Great diagnosis I can't believe that this fix can be hard for some technicians You have to be careful people out there from being paying more money because of bad diagnosis

I’ve learned so much from your videos Dan. More than I have learned from any other channel.

Awesome example of multimeter v test lamp, excellent work Dan, thanks👍👍👍😊😊😊

Your videos deserves two thumb ups. Moshitoa (south Africa

I never failed to be impressed Dan, keep up the good work!