Electrical noise

Michael Diagnostician Illinois Posted   Latest  

Hi everyone here is another case study I did using the Escope Elite to find a electrical noise issue on a remote throttle sensor circuit. Escope HD for the win.

youtu​.​be/s8pyfkPIgdY

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Brian Instructor
Ohio
Brian Default
 

Nice case study. This is the reason why it is so important for those using a scope to check known good circuits. Currently many of the new scope users in my area get caught up with noise on signals of all sorts, IE spikes on crank or cam signals. Some noise in normal but learning how much is too much is where experience will help. Can you reply or put in your description briefly the specs that…

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Jose Technician
California
Jose Default
 

Great video Mikey! ATS scope looks pretty sharp

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Tim Mechanic
Arkansas
Tim Default
 

Scope? What's that? 😂 Just kidding Mike. Don't hurt me!

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Michael, a scope makes it easier to catch such issues, indeed. Do you have a guess about what went wrong with the original wiring?

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Michael Diagnostician
Illinois
Michael Default
 

I am thinking the twisted pair wires got damaged in one section close to the engine.

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Now you got me wondering if that would show on a lowly ohmmeter or not...

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Michael Diagnostician
Illinois
Michael Default
 

I dont think so. A ohmeter can tell if you have continuity or a short to ground or wire to wire short but it can't tell you if the twisted pair has unwound too much.

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Ah, so you are saying it is not physical damage to each wire... I would love to see a picture of such damage.

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Michael Diagnostician
Illinois
Michael Default
 

Sorry I dont have a pic. I just ran a new harness to the remote throttle. I could not see anything obvious.

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Dmitriy Analyst
Ontario
Dmitriy Default
 

Michael, yeah, I understand that there is no picture this time, but if sometime in the future you encounter a twisted pair that passes the ohmmeter test and has an unwound section, that would make an epic picture. Thank you in advance!

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Michael Diagnostician
Illinois
Michael Default
 

Sure no problem.

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Randy Diagnostician
California
Randy Default
 

So how do like ats scope ???? Could you have found this with a pico

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Michael Diagnostician
Illinois
Michael Default
 

The Escope is a very capable tool Randy. I have fixed tons of problem buses with this scope. Plus I like the fact that the equipment is designed by a Tech and Engineer and it has handy features designed for the Tech in mind. Bernie, Neil, Jeff are also very open to suggestions to make the equipment better as well. Now as for Pico being able to find this fault yes absolutely it would see it. I am…

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Randy Diagnostician
California
Randy Default
 

So two different scopes are better than one

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Michael Diagnostician
Illinois
Michael Default
 

Do you mean dual time base on the Ats scopes?

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Stephen Mechanic
United Kingdom
Stephen Default
 

Thanks, good report. We have a saying in tech circles in uk. No scope, no hope. Regards steve.

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Carl Technician
Ireland
Carl Default
 

I like that Steve, no scope, no hope! Not too far away from you in Dublin...Hope things are picking up for you garage wise, lockdown is getting old.

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Caleb Diagnostician
Indiana
Caleb Default
 

Sick video Michael. Thanks alot. A scope of any kind should be as common as a 10mm socket.

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