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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

2017 Chevy Tahoe P0340 P0314

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6 months 4 weeks ago #83852 by tbean
2017 Chevy Tahoe P0340 P0314 was created by tbean
My shop replaced the engine for a 2017 Chevy Tahoe 5.3 with a rebuilt Jasper with AFM delete. The truck is now storing a code P0340 and P0341 for the CMP sensor. I checked for 5V reference, ground, and scoped the signal. The ref circuit checked good and the ground checked good with a test light. The scope image of the signal circuit showed a shark fin waveform switching from 3V to ground with no drop outs. I swapped the CMP with an OEM sensor and I'm getting the same code and same scope image. Is it possible to have a tone wheel issue with the CMP causing the funky shark fin waveform instead of a clean square wave? Possibly the timing cover isn't aligned properly causing an air gap issue? Has anyone else ran into this? CMP DSO Image  Please see the attached Scope Image. 
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6 months 3 weeks ago #83854 by Lupe
Replied by Lupe on topic 2017 Chevy Tahoe P0340 P0314
so your old 5.3 had AFM ? DID YOU program your ECM for new delete ?

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6 months 3 weeks ago #83860 by tbean
Replied by tbean on topic 2017 Chevy Tahoe P0340 P0314
Yeah Jasper sends you a HP tuner with the new engine.

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6 months 3 weeks ago #83972 by Noah
Replied by Noah on topic 2017 Chevy Tahoe P0340 P0314
I agree with you, that waveform is suspect looking.
I think an inspection and comparison of the camshaft reluctor to the original part is justified.

"Ground cannot be checked with a 10mm socket"

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