How Engine Sensors Work: Crankshaft, Camshaft, ABS. Magnetic Inductive Sensors.

Magnetic inductive sensors are very commonly used on modern vehicles and their failure can cause all kinds of problems: Difficulty starting, acceleration problems, engine speed 'hunting', increased fuel consumption and even the engine cutting out while driving.

For more information, see my website post about this video:

Cheers!
Chris 👍

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#enginesensors #electronics #electromagnetism

[zerd]

Thank you! We were just covering this in an engineering class, and your video really helped me to understand inductive sensors!

[JohnBusa]

Brilliant...this is what im trying to tell my mechs...I had issues with my CKP sensor.

[jesswatkins]

This is a brilliant video! Really helped me refresh my memory on how they work. Please do more automotive videos! You explain things really simply and clearly! I've been looking around for educational videos to help me with my distance course but most have robotic it boring voices and often don't keep it simple (I easily get distracted 😇). THANKYOU!

[BenDiab]

Pro..man..you are legend ..thanks..for your explan..ted..

[JusticeAlways]

Can it be used to sense a mother-in-law knocking on my front door? 😅
Great video...thanks!

[srdoberman]

Sir, yes this video has been very useful. Thanks for the great visuals and info

[danielheimman]

amazing! thank you for the video! you make it so much clear!!

[atomicdmt]

thanks! i recently put in a NEW (but bad) CKP sensor and its apparently shorted internally- screwing up my fuel level gauge, ignition coil/ignitor(?) and setting off a host of other selonoids- et al! I cleaned all grounds, rebuilt my fuse box, new ECU, cleaned changes UNTIL i just now decided to swap back in the old CKP sensor. All the electrical clicking, etc went away immediately and Im not going thru the KEY RELEARN process for the new ECU

[joelvermiglio]

Nice vid and diagrams but you got your wires a bit crossed towards the end (pun intended).
The indicative sensor you’re describing has an output voltage proportional to the rpm of the reluctor - you demonstrated that nicely with the salad spinner and these are used in applications where speed information is required, but position is not. You went a bit awry when you mentioned the missing tooth “which helps the ECM”.
The missing tooth trigger wheel (used by most vehicles crank shaft sensors and commonly a 32:1 or 60:2 - teeth to missing teeth arrangement) is a feature of Hall effect sensors. These produce a square wave wrt (usually) a 5v reference and it is the frequency which changes with rpm, rather than output voltage. The engine management can interpret this frequency as engine speed, and will spot the missing tooth as it passes. From this it will know both speed and the position of the crankshaft relative to top dead centre and can time ignition and fuelling to suit.
This video is years old now though so I’m sure it’s since been covered by you!

[simaimafatai]

Bro thanks for share your knowledge, l learn something here

[kyle.]

This was a very well explained video! Thanks! Subbed

[Toturials]

thanks for the video. One question if rpm=3000 tooth no 60 what will be frequency .

[ishatoncoppercab]

The theory is correct, but most of the crankshaft pos. sensors I run into work on a 5Vdc reference voltage- NOT AC. These sensors typically "pull down" from 5v to 0v as the reluctor passes, creating a square wave pattern (when viewed via an oscilloscope) that the PCM uses to index the location of the crankshaft.

[TheErsatzMode]

Thanks for the video. A diagnostics code tells me my motorcycle's crankshaft sensor has a fault. Unfortunately, a new one costs a £few hundred. Why would the sensor fail (for no obvious reason), and is it possible to repair it myself?

[BearRyan]

My Nissan Almera 1.5 Petrol 2004 is having really bad starts. In very cold weather it's even worse. I can get it to run eventually but it throws up the code for bad crankshaft sensor. I had it changed back in July and everything was fine for around 8 weeks then the old symptoms started again and the code reappeared. Could it just be that the sensor has gone bad or could the chain be stretching? Love your videos by the way!

[CobraVeight]

Hi Chris, I am using a MSD84661 magnetic sensor and it is in my EFI ford (motec) ecu i am having problems with sync errors, i have tried different gaps, it has a shielded wire, it is about a year old, my tuner did some filter adjustments, but its always come up ? do you know if i alter the position of the flag and reset the crip angle, if this would help, also i have read they are good at picking up noise, could it be picking up noise from inside the distributor cap ?

[abdullaharslan]

Hello Brother
I have a few questions for you about this subject, thank you very much if you answer.
i will owe

[rojjst]

Bro video is great...but I was wondering that some manufacturers put TECHO METER without the sensor..I mean does the techometer works from the coil power... And how accurate is that...you should bring this to LIMELIGHT .. And as always video was GREAT 🔥🔥🔥

[Webstar]

I'm surprised You Tube didn't flag this video? Did you just toss a salad?

[samannaydas]

I would have disliked the video for the explanation in the beginning, but then the demonstration came in, and I changed my mind