Not Quite A Case Study, Merely My First Contribution

Thomas Diagnostician Saint Petersburg, Florida Posted   Latest  
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Driveability
2007 GMC Yukon Denali 6.2L (8 L92) 6-spd (6L80)
P0341 — Camshaft Position Sensor "A" Circuit Range/Performance Bank 1 or Single Sensor
Intermittent Extended Cranking
Check Engine Light On

Greeting all, looking for a known good Cam/Crank waveform for this vehicle, please. Thanks in advance....

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Ray Diagnostician
North York, Ontario
Ray Default
 

This is from an 09 6.2 known good.

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Thomas Diagnostician
Saint Petersburg, Florida
Thomas Default
 

Thank you so much, Ray!

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Thomas Diagnostician
Saint Petersburg, Florida
Thomas Update
 

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…

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Ray Diagnostician
North York, Ontario
Ray Default
 

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.

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Larry Mechanic
Watertown, Wisconsin
Larry Default
 

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…

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

Snap-On refers to that time as "sweep", IOW, it's for the whole screen.

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Larry Mechanic
Watertown, Wisconsin
Larry Default
 

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.

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
   

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…

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Ray Diagnostician
North York, Ontario
Ray Default
 

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…

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