Not Quite A Case Study, Merely My First Contribution
Greeting all, looking for a known good Cam/Crank waveform for this vehicle, please. Thanks in advance....
Interestingly, the Crank signal on on my vehicle is inverted. It flags a P0341 for Camshaft Position Sensor Performance. Another shop has already replaced both the Cam & Crank sensors with what appear to be aftermarket parts. I have heard of polarity issues on Nissans before and am wondering if the inverted Crank signal could flag a Cam sensor code.... Also, there appears to be a lot of…
Your inverted crank signal might be good for a 2007. Alldata may have a good cmp ckp waveform for the 2007 if you look thru the P0341 or P0335 codes. In this capture, I didn't filter the noise out of the cmp. The ckp has 58 toggles in a 360 degree rotation and the cmp toggle voltage rises at 57.14 ckp degrees or 8 ckp toggles from the missing toggle.
I have a 2008 L92 capture that looks just like Ray's. I haven't used Snap On's scope in quite a while, so bear with me a bit. Is it possible you need to recapture at a faster time base? Like 5-10 ms per division, then use the "anti" zoom feature to see the bigger picture, if you wish. I see your screen capture has 20 ms, but I don't know if that is per division or total time. Like I said, long…
Snap-On refers to that time as "sweep", IOW, it's for the whole screen.
Ah, ok. I seem to remember you could change that setting to read in either "per division" or the "total screen", but it's probably been 10 years since I used a Snappy. Thanks.
I do not have SI in front of me but I remember the code set criteria well enough to help you I think. Let's step back for a moment Thomas. P0341 sets when the PCM sees a certain amount of missing cam sensor pulses in a certain amount of time. So knowing that an your symptoms let's think about this logically. Ray will correct me if I'm wrong lol. The symptom is intermittent extended crank but…
On some engines, the sensors have a ground offset, but these sensors are pulled to ground. This capture shows 2 crank revolutions and 1 complete cam reluctor rotation. Check that all of the cmp reluctor fingers measure the same voltages. If you find a voltage drop at the cmp sensor, scope and measure the 3 cmp wire voltages near or at the PCM. If you get the Pico working, set the scope to 1…