How to Test Crankshaft and Camshaft Sensors 2

[srdmagic]

Thank you Stephen Hawking.

[ADPTraining]

@srdmagic Nice of you to post. I'd to coax a bit more information off of you and like you to tell us what we've done right and why you like or don't like about our videos. We also encourage you to visit our latest series "Stories from the Road", "BMW European technology" and "Advanced Automotive Electronics". Thanks so much for posting.

[sissifranca]

Robo-voice aside, I love your videos. The content is very well written. As a small and pedantic point - you correctly describe a 'peak to peak' reading but then at 4:21 you show two peak points (one above the line, one below) and appear to label the distance between these as amplitude. "Amplitude" is technically only half of this - i.e from either peak to the midline. Wiki words it nicely: "visually represented by the vertical distance between the extrema of the curve and the equilibrium value."

[ADPTraining]

@sissifranca Thanks for the compliment. Ok I understand your point, but in reality there are various ways to view this issue. First, (not in this case) the entire waveform could be above the zero line and PP would still be the same. As a rule, you're right, peak value in zero to either positive or negative maximums. The reality is that unless you have a clipping diode in the circuit (doesn't apply to cars), both sides would be that same. CONTINUED:::

[ADPTraining]

@ADPTraining CONTINUED: The importance of all this is that the ECM needs a specific P-to-P value to be able to recognize the signal. Signal recognition threshold is an often ignored point when it comes to diagnosing signal issues. I appreciate your input and keep it up. We also have a new BMW and Advanced Electronics SERIES here on this channel. Enjoy...

[James1toknow]

The Hall effects produces a AC current there by being a sign wave. Grounding should be isolated. RIGHT?

[ADPTraining]

@James1toknow Hello, well not always. On most systems the sensor ground is not isolated. On some rare systems they use a floating ground, but this practice is pretty much gone. I should mention that the Hall-Effect does not produce a sine wave. It produces a square wave. The side wave seen here is from a magnetic crank sensor. The HE sensor contains its own switching transistor. Thanks so much for posting and good luck.

[James1toknow]

@ADPTraining Great I don't have a problem but note on another instruction said that the hall effects do produce a sine wave or ac current but I have noted what you said and will remember this. thank you.

[ADPTraining]

@James1toknow Great, love to hear you guys using our videos as a repair source/help. Anytime and keep posting...

[James1toknow]

@ADPTraining Thank you!

Great info.

[ADPTraining]

@James1toknow Love to see you participating. If it wasn't mentioned before, we're an auto repair advice service here on this channel. Good luck.

[James1toknow]

@ADPTraining I'm a 21 year telecommunication technician and light to medium AC electrician, but I'm referring back to school to obtain my EE, I will keep you in mind, and love the Tech talk I can't get enough!

[domyaska]

thank you very much for all your videos!!!!!!!!!!..ciao

[nobleheight]

1:13 "Make sure that the oscilloscope or graphing multi-meter is NOT INTERNALLY GROUNDING one of the leads.

How do you make sure?

[ADPTraining]

Again, good question. This is a horrible design mistake made by some equipment makers. The best explanation I can give you is this: Years ago when installing a car radio some speakers had what was called FLOATING GROUND. This means that the vehicle ground is different than the speaker ground.

The same goes for some magnetic sensors. And at any point in time this may hold true for any future sensors ground or network return line (ground).

[ADPTraining]

To determine if your scope lead ground is vehicle ground just do a continuity test (using a MM) from Batt ground to the Black lead. Remember to power up whatever scope you're using. Often times on grounded units it may be necessary to run the scope on battery alone to isolate the equipment and be able to graph floating ground Magnetic speed sensors.