2012 Nissan Sentra Long Crank and Intermittent No start

Getting Code P0335 - Crankshaft Position Sensor A Circuit. Scoped Crank sensor, seems to be dropping signal at the sensor, maintains good ground and 5v from PCM. Replaced sensor with OE part, same issue. Checked reluctor wheel on crank with borescope, looks normal. Any ideas what else this could be? Thanks for your thoughts!




Green trace on picture is intake Cam, Yellow is Crank. 
 

If you disconnect the sensor and check for signal wire integrity, do you see any dropouts while the wire is wriggled? Do you check the connectors for pin looseness and corrosions?

Your crank signal, definitely, doesn't look right. I'm curious if the anomalies are, consistently, repeated. Or, if it is random.

I would turn on "Peak" detect, set your screen time for about 5ms, and re-capture.
After you record your capture, click the magnifying glass to zoom out. Post a screen shot of a little more than 720° of crank rotation and post a screen shot with many more rotations, to look for repetition.

 

To check for signal wire integrity I had channel 1 on the wire at the PCM and channel 2 at the sensor, both matched perfectly all the time, is there a better way to check that wire? I wiggled the connecter a lot, signal did not change at all, It is clean, no corrosion, pins are fine

If you maintain good feed and ground to the sensor, you wriggle the wire and the signal does not drop out, you may have a bad oem sensor. With reluctor wheel not damaged, no pin looseness or corrosion, I cannot think of any other things but a bad sensor.

We have another sensor coming tomorrow, will see if that helps. Had the same issue of getting bad new parts last week as well, very frustrating lol

Will try this tomorrow morning, seems to occur worse after heat soak so it takes a bit of time

If it get worse when hot, the sensor may be the culprit. Keep us posted.