ZX636RIDER03

Have been getting this code being triggered and im not sure what is causing it. Ive changed out the sensor and checked the wiring around the sensor and it seems to be all in tacked. Checked out the reluctor wheel and their isnt anything on it that i thought may be triggering a bad reading. Also tightened the hub just in case it was loose as well. The car runs great and I dont see any change due to the code showing up in performance. Anyone have any suggestions on what could be causing this or where to start with it? The exact code on my scanner says:

Crank Shaft Position Sensor A CKT Range/Perf

Thanks

Injuneer

Sounds like you have code P0336. That sets based on the duty cycle of the CKP output signal. Is it possible the reulctor is loose or contacting the timing cover? Were you driving over exceptionally rough roads?

I have seen a couple threads where the problem was seemingly traced back to the Opti. The PCM has to compare the crank velocity, as measured by the CKP sensor to the known velocity variations with no cylinders misfiring. I suspect it needs an accurate RPM signal from the high resolution portion of the optical cam position sensor in the Opti to do that, and if the high resolution signal is corrupt, it may show up as a CPK code. I can't say that with asolute certainty, but it seems to be a possibility.

moparman

I've had the P0336 pop up after driving over rough roads.

ZX636RIDER03

I just changed out the opti but the code was being triggered before and now after the swap, and I have not driven over any rough roads either. I have read some of the other posts of yours and I believe one of them talks about the CPS not being in sync with the opti due to a skipped tooth or a slackened chain. Sometimes when I really get on it i do hear a little bit of chatter. Could that be the timing chain slapping on the sides of the timing cover? I just did a rocker adjustment so i'm opting that out of the noise source. The timing chain that i have on is about 50k old.

Thanks

Injuneer

The CKP sensor doesn't pick up noise. It's just the magnetic impulses of the 4 teeth on the reluctor wheel. A wheel that's rubbing, or not maintaining a constant gap between the teeth and the sensor might throw the readings off. I don't have one on my 94, so I have never really dug into them to see how they work. The problem might also be caused by a high voltage cable (e.g. - plug or coil wire) running parallel to the CKP sensor harness. I don't recall mentioning anything about a skipped tooth or the chain being loose, if you were attributing that to me.

ZX636RIDER03

oh sorry about that, i think you were on the same post as shoebox which the topic was mentioning that. Ive checked the wiring which is running from back behind the engine away from the spark plug wires. I know what you talking about on your 94, I had an obd1 conversion done before and never had a problem because the CPS was programmed out. Now i switched back to OBD2 because the old PCM got water damaged. If their is just a slight amount of slack between the crank and the cam gears do you think that would cause the sensor to be triggered. At this point im just trying to exhaust all my options before I decided to tear into that section of the engine.

Thanks again,

antoine

The crank sensor is used for picking up cylinder misfire that's all .

ZX636RIDER03

Would it be possible if for some reason the crank key that held the reluctor wheel in place somehow got worn down enough to allow the reluctor wheel to slip causing the reading to be inaccurate?

RamAir95TA

Very unlikely for a woodruff key to wear. There's nothing for it to wear against.