CAM And CRANK Sensor Signal Jumped Timing Detection, Automotive Oscilloscope Study Course

Welcome to ADP training, YouTube's automotive technology channel in this channel, you'll learn all kinds of auto repair secrets, how your automobile works and how to diagnose it. Hello, everybody and welcome to another video today. We are going to do a video on analyzing the cam and crank sensor signal. So we're going to do an analysis of these waveforms now on uh on screen as you can see, this is a typical, uh, Cameron crank signal taken from my library. Now, uh, this particular signal was, um.

This is this. Is, I forgot, I really don't know which car this belongs to. But this is uh, it's, a good signal. Uh.

Now, I want you to pay attention to the correlation between cam and crank. And I want to show you a few. This is an older vehicle that that much, I know, uh. So as you can see, uh, and this is a similar vehicle. Uh, the bottom waveform it's, the cam sensor. And the upper waveform is the crank sensor. We're going to do we actually recorded an uh, a complete?

Uh, uh, waveform analysis of actually a waveform on the. Scope and we're going to play that for you towards, uh, uh in a little towards the uh in the middle of the uh of the video. Okay. So again, this is the relationship between cam and crank. The upper one is the crank. The lower.

The lower one is the uh, the cam sensor. Now on the next shot that we have we're going to show you how to use these two, uh signals to know or to correlate them. And to know whether you have a jumped timing belt or a stretched timing belt, timing chain and so on and so forth. Now as. You can see on screen we're going to use the original, uh, you know, the software that we've always been using now pay attention to these two pulses at the bottom this.

This is. This is the can understand one thing for every revolution of the cam, uh for it's, half a revolution of the crank. So the crank turns twice, okay for per every uh cam revolution.

So the cam turns twice, the crank turns once okay, this is important. Okay, because if you have a jumped or a stretch timing belt, you're going to know right. Away and I'll show you how uh later on in the video. Now, as you can see the top signal belongs to a crank sensor, and it's always like that, it's always, uh, you know, you're going to have a bunch of pulses on the crank signal and a few pulses on the cam signal because this is the cam signal all it wants to do is tell the ECM, uh, number one, top dead center from uh, from number one, top dead center. Now this is, I mean, this is why I actually show I'm showing you this two pulses of the cam.

Represents a complete crank revolution. Okay? And this is important, uh, because of the fact that you have to know how many pulses you're going to get of the crank per cam pulse, okay and that's going to determine uh for many reasons. And in between the cursors here that you see, uh, this is a complete, uh, again, a complete crankshaft revolution. Okay. Now, uh, if the timing chain or the timing belt is stretched.

And this is the purpose really of this video, uh to allow you to, uh, determine if you have a. Stretch timing belt or timing chain without doing major disassembly by just looking at the cam and crank now, uh, you don't know that right now. But I want to show you how uh in a little, uh.

But anyhow, let me just uh explain to you the relationship of cam and crank. Now, this is one pulse, uh on screen per every per pulse you're going to see a couple of pulses on the crank. Now, remember that the crank sensor has a reactor wheel with a bunch of little teeth. Uh, this is called the reactor these. The. Little teeth are called as again.

This reactor has a correlation you're supposed to have x amount. And I can't tell you how many because it depends on the year make a model and the engine size of whatever you're fixing you're, diagnosing it doesn't really matter you have to have yourself a signal a good signal. Library.

This is a must okay, uh. If not you look it up online now, these days, uh, 20 years ago, when I started doing this, you know, there was nothing online, uh, even google wasn't that. Great back then so again, we're, looking at half a crank, uh, uh, revolution, uh, one cam revolution, and we just changed it now you so you. What you do is you count the number two things that you're supposed to do either count the number of cycles, uh that you see on the crank, okay, or the number of cycles that you see on the cam in between the cam pulse, okay.

And again, I want to show you later on. I actually have two, uh, uh shots that I did, uh, and I'm actually going to show you how to do that as you. Can see on screen, uh, what you're looking at it's, a snapshot a screenshot of the camera crank correlation and right now, I'm, counting five, uh, crank pulses per cam pulse. This is well. This is one way to do it.

Okay. Now, this is supposed to be not supposed to be. This is a recorded, uh, waveform from a good known. Cameron crank. This is a running engine. Uh, there was nothing wrong with it. Okay?

And I think I believe this is an older vehicle too. When I say older, uh, early 2000s, you know, uh, again. And now. Next, uh, we're going to see this it's a now you have two, uh, crank, um, pulses or cycles. You know, per cam pulse. Okay, this uh shows.

And this is, this was a really really really awful running car. And this shows a stretched timing chain. This was actually, I think it was a Nissan. If I remember correctly, this is a definitely a stretch timing change. Sure enough we pulled that out, and it was a disaster, even the tensioner was, uh, all the guys were worn out horrible, uh.

So, and this is. So this is an easy way to. Do it again, uh, you can also count the number of pulses like we showed you before, uh you.

What you do is you go between you go two crank, two cams, revolutions, okay. And then you count the number of pulses on the crank, okay. And that also tells you, but then you have to have a good known waveform. Once you get used to, uh, um, you know, doing this stuff you're going to be, uh, you're, going to know more or less. You can also look at the um crank, a reactor and right away. You count the number of teeth.

Furthermore, you know, On the reactor and right away, you know, because these pulses on the crank sensor are this is the exact number of teeth that you have on the crank. Okay. Now if it's a little of work, but it's a lot it's.

A lot easier it's, a lot better than doing the disassembly and tearing down the engine. Uh, just to find out that there's, nothing wrong with the cam. And your issue is something else. Okay. So again, this is another one of those things that you can do with the oscilloscope and which saves a lot. Of time, okay, and that way you'll be able to, uh, um, definitely do a lot with your diagnostics that way.

So anyhow, this is, uh has been. Uh. This is the series that we're running now it's, a cam oscilloscope right now. We're doing the camera crank correlation signal analysis. But this is an oscilloscope, uh series that we're doing, uh, again on screen you, you know, we show you exactly what we showed you before, uh, uh, the correlation how to tell whether you have a stretched timing chain we'd like to thank. You for tuning in to our videos on our channel, ADP training, uh, do a search on Google for automotive diagnostics and publishing subscribe to our website, we're always putting out free stuff. Okay and uh, again, tomorrow, we're doing another campaign, and where I think we're giving out a free software.

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  • Crank Sensor , Timing Belt