Crankshaft position sensor not learned. I can not clear this code with A-tap or by resetting the pcm. Do I have a bad sensor? How do I check this?

Thanks
Mike

 

i know that the tech2 has a crank learn procedure. just a thought.

 

P0336 CKP sensor performance
Page 6-1562 of 2K manual

The CKP sensor determines the crankshaft position to allow the PCM to set spark and fuel needs and also to detct misfires.

This code is set when the CKP signal is out of range for more than one second, on the second consecutive occurance.

First inspect PCM harness, the crankshaft relictor wheel, the CKP sensor itself, it's wiring, an out of fuel condition, or if the crankshaft has been rotated backwards (only applicable on Manual tranny vehicles, if vehicle is on an incline an clutch is released causing an engine stall and reverse rotation.), or excess end play in crankshaft, or any aftermarket modifications near or around CKP sensor.

1. Confirm no P0335 code is set - if so attend to this first.

2. Confirm all wiring near CKP sensor is routed correctly - this is inportant as any secondary ignition, aftermarket, or other electrical device may cause excessive interferance in this circuit and "confuse" PCM.

3.Inspect all connections at CKP and PCM for any corrosion, defect, or damage.

4. Remove CKP sensor and inspect (YOU MUST do a CKP System Variation Learn Procedure ANYTIME this sensor is moved. - A Tech II OR EFILive V6 can do this) for damage.

5. Inspect reluctor wheel for damage.

Any damage to either of these, refer to "Crankshaft & Bearing Removal in Engine" (and open wallet and cringe!).

I am surprised one of the last steps is not "replace PCM" which is usually found near the end of the diag charts...

Note these procedures are for unmodified engines and PCMs. Any differences to OEM specs may result in different diagnosis and treatment. Use at your own risk. Do not inhale. For adult use only. Light fuse, run away, do not hold in hand...

Good luck!

 

Thanks, I guess I will pull the starter and check the wires first. The code is actually p1336. The car runs fine. If the sensor is bad and I change it, does the dealer have to use the tech2 to square everything away?

 

yea P1336 is the CKP Variation not Learned... page 6-1747.

Anytime you mess with the CKP sensor you need to do this. Either EFILive V6 (see www.efilive.com) OR a TECH II (dealer) can do this. It's sort of a "calibration" routine.

 

how about a link to the service manual

 

See this link, (thanks Paul!) and unless you are a GM tech, the service manual is not available "online"...

http://www.seattleautomotive.com/ckpdoc.htm

 

Cool , thanks for the info. All the wires check out ok. I have not done anything to the car in quite a while. I will go to the dealer and have them relearn the ckp.

Thank you.

 

EMarkay, I have a new CPS and put a new connector on too. I have P0336 and P0335 codes? Could this be the same problem? I know I'll have to do that relearn thing, would the relearn work?