Are all Hall effect sensors supposed to generate a magnetic field?

Hello, all!

Im diagnosing a crank no start issue on a Nissan Qashqai 1.2 DiG-T engine. I did a clutch kit change and now the car won't start. It just cranks and cranks and cranks.

Now, this is less of a post asking you to help me with the no start itself, and more of a hope that someone will answer my question, that is, do all Hall effect sensors, in this case a crankshaft position sensor, when given a power, ground, and signal (this case its 5v each, less than 100mV for the grnd) produce a magnetic field that one can influence by placing a metal object in front of it?

The thing is, is that the car throws a camshaft irregular signal code. I checked with a scope and both camshaft sensors (Hall effect) produce a typical textbook digital squarewave. 5-0-5-0-5-0. Both of them. Also, when I take them out (still connected) I can make ignition coils, injectors etc. fire by activating (not sure if that's the right word) both camshaft sensors by placing a piece of metal in front of them. 

HOWEVER, the CKP not only does not produce any signal (maybe just a few "spikes" barely noticeable to even zoom in with a scope), but it also doesn't react to anything metal (the same metal I used for the camshafts).

Nothing on the scope, and I can't feel the magnet pulling the metal to it (as is the case with both camshaft sensors). 

I was very confident that I found the cause, verifying it's pull down, power, signal, ground good, ordered a new CKP sensor. Which changed nothing... Still no magnetic effect...

Now, this could be a new but faulty sensor, just like SD himself had on that one Chrysler video.

But, I was also wondering whether all Hall effects work the same way? All three are pull down, but only two produce a magnetic effect... Maybe the CKP doesn't? Maybe I'm barking up the wrong tree here?

I'll look into the timing of the engine and let you guys know. 

Thank you for your help!

Monitor the Power and Ground of the sensor as you test it. Make sure that the ground voltage remains less than 100mv and that the power supply voltage does not drop.

Ok, I will, thanks for the suggestion, I'll do it tomorrow!

May I refer you back to the other part of the question? That is, do all Hall sensors, supplied with a power, signal, and ground supposed to produce a magnetic field?

If I recall correctly there is another type of Hall sensor but those ones are used as ABS sensors and have two pins.

do all Hall sensors, supplied with a power, signal, and ground supposed to produce a magnetic field?

Yes. To my knowledge, all hall effect sensors work by the disruption of a magnetic field.

there is another type of Hall sensor but those ones are used as ABS sensors and have two pins.

This is an MR sensor... Magnetoresitive sensor.

That's... What I thought as well. But I was stumped to see the new one that didn't. And calling a new sensor failure is not something I'm very comfortable with.

So, technically, regardless of build, it's supposed to let of a magnetic field and attract anything metal to it.

Well, I'm unfortunately very confused...

The no start turned out to be a jumped timing chain on the exhaust cam.

When I took the cover off, the chain was hanging (!) Slightly from the crank sprocket. You could make the chain move from link to link that's how bad it was. When tightening the flywheel bolts, I must have turned the wheel clockwise, which would have turned the engine counterclockwise jumping the loose chain.

But that still doesn't make sense. I just cannot explain why the crank had no signal... After it fired up, I scoped the sensor and now there was some activity, just nothing comparable to the camshaft sqaurewave...

Kind of annoying, really, because that really threw me down a path of thinking the crank sensor was faulty. 

A very unsatisfying result. I'll post some pictures and maybe someone could explain it to me, I'd be very grateful. Maybe the flywheel has so many teeth you can't pick them out on a scope? Although... That makes no sense. 

Btw, the scope is zoomed in the way and you can't make out any details. It's on the same time base as the camshafts. Although, changing the settings did nothing.

It's even weirder that I couldn't get the sensor to activate when putting something metal in front of it as I could with the cam sensors...