R&R crankshaft sensor on 08 GMC 1500?

Tx Jim · Nov 4, 2019

Is relearning sensor with code scan tool really necessary??? I had CS sensor replaced due to code Po335. Engine seems to operate better & tachometer operates again. U-tube video stated sensor needed relearn procedure performed by accelerating engine to 5050 rpms with scan tool attached!! That rpm sounds very high to this old gray haired codger.

To keep this thread tractor related I utilize my truck with rd bale spear bed similar to my tractor putting out rd/delivering bales.:lol:

Thanks,Jim

jimg.allentown · Nov 4, 2019

That just doesn't sound right. I don't think it is ever a good idea to static rev an engine that high. Also, if the sensor is not a "smart" sensor, I have no idea why it would need to learn anything. It either works or does not. Since the engine is running, tach is operating, and it seems to run better, everything should be OK.

4play · Nov 4, 2019

I'm not sure if there is a way to do this without a scan tool, but CKP relearn is needed after replacing a CKP sensor, ECM, engine or crankshaft etc. After following specific instructions there is a moment where you hold throttle to the floor until it reaches the fuel cut-off ( rev limiter) briefly that is, just hold it long enough to hit the limiter then close the throttle.

DTC P0315 will set if the CKP variation has not been learned. It doesn't affect the way the engine runs, due to design tolerances it is just synchronizing the sensors for it's own misfire diagnostics. If it needs to be done, you should see a ck eng light on with the dtc listed above stored.

Tx Jim · Nov 5, 2019

Thank you both for your replies.
Jim

R&R crankshaft sensor on 08 GMC 1500?

Tx Jim

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jimg.allentown

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4play

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Tx Jim

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