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Camshaft / Crankshaft Correlation - Where to go from here?

Old 03-06-2019, 10:47 AM
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Default Camshaft / Crankshaft Correlation - Where to go from here?

I have the dreaded p1345 check engine light.
Its saying that there is a mis-correlation between the camshaft and crank shaft.

I already replaced the
-Camshaft position sensor
-Crankshaft position sensor
-Solenoid that supplies oil to camshaft phasor (camshaft position actuator solenoid)

I still have the check engine light. Is the next set to tear down the engine?

I figure I can first check the each of the plugs with a multimeter for voltage.

If all 3 get power then I can remove the valve cover and check if the timing chain hasnít slipped.

If the timing chain hasnít slipped then what do I do? Do I check if the camshaft phaser isnít siezed? Do they even go bad?

Maybe I only need a case relearn?? I have been avoiding the dealer since this is an older car.

03 Trailblazer with the I6
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Old 03-06-2019, 12:04 PM
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I'm pretty sure you to do a relearn after replacing the crankshaft sensor. You need a scan tool that can perform the relearn.
Also, the engine requires regular oil changes as the feed hole and phasers don't like gummy/gooey.
Do you hear a rattle for a couple seconds when starting cold?
I doubt your chain has jumped but it could be stretched.
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Old 03-06-2019, 01:24 PM
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What carfixer007 said above ^^^^^^ plus:

How many miles are on it?

What do you know of this car'* maintenance history, especially oil changes?

Any recent repairs on this engine?

Did you clear the code(*) after replacing the sensors?

How much has it been driven since the repair (looking for whether or not it has been driven enough times to run for a while several times in closed-loop mode)?
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Old 03-06-2019, 02:10 PM
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Originally Posted by CathedralCub View Post
What carfixer007 said above ^^^^^^ plus:

How many miles are on it?

What do you know of this car'* maintenance history, especially oil changes?

Any recent repairs on this engine?

Did you clear the code(*) after replacing the sensors?

How much has it been driven since the repair (looking for whether or not it has been driven enough times to run for a while several times in closed-loop mode)?
120k

good maintence with oil change every 5k (full synthetic)

no engine repairs

cleared codes and they come back immediately on 2nd start. 1rst start triggers pending code

no idea if the required drive cycle to calibrate the sensor without the scanner (if designed that way) has been completed since the car later takes many short city trips and rarely goes on the highway.

Originally Posted by carfixer007 View Post
I'm pretty sure you to do a relearn after replacing the crankshaft sensor. You need a scan tool that can perform the relearn.
Also, the engine requires regular oil changes as the feed hole and phasers don't like gummy/gooey.
Do you hear a rattle for a couple seconds when starting cold?
I doubt your chain has jumped but it could be stretched.
I purchased a cliffton service manual book for suv and it also said a reprogram is required after changing the crankshaft sensor BUT I read YouTube comments that they got away with replacing the sensor without a relearn. I also read that a pending relearn throws a different code p0300 I think rather than the correction code I am dealing with.

no phaser rattle while oil is building pressure (know exactaly what you are talking about)

oil was not even gummed up to the point to clog the screen on the camshaft solenoid. The solenoid had failed and needed replacing, but that is because the seal let loose and was leaking oil into electrical.

no significant noise from the chain or engine bay (Dropbox link https://www.dropbox.com/*/jbsv7bfv3s...%20PM.mov?dl=0 )

Would chain tensioner not take care of any chain streching?? Or do you think ití* stretched out of correlation spec.

ó

thanks for the replies so far.
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Old 03-06-2019, 02:55 PM
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Originally Posted by dkspa7 View Post
Would chain tensioner not take care of any chain streching?? Or do you think ití* stretched out of correlation spec.

thanks for the replies so far.
If the chain stretches enough it can get the cams and crank out of time enough to set the code. I've seen it a few times. The thing with the stretched chain is it will many times set other codes. I think you should take it to a shop that can do the relearn so you don't beat yourself up in the meantime.

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Old 03-07-2019, 01:02 AM
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I wonder if you disconnect the cam phaser solenoid electrical connection if it posts a different code or the same code.

I looked around and am finding 70% folks say relearn and 30% say you can get away without it.
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Old 03-09-2019, 09:25 AM
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Originally Posted by CathedralCub View Post
I wonder if you disconnect the cam phaser solenoid electrical connection if it posts a different code or the same code.

I looked around and am finding 70% folks say relearn and 30% say you can get away without it.
I disconnected the camshaft and did get a no signal code (maybe) p0304 so the computer is reading signal from it.

I also disconnected the solenoid and did measure 12v going into the wire with a multimeter. So electrical looks good. (It probably now probably has a no solenoid code + correlation fault, but I didnít scan it yet)

ó

Today and check the timing marks and also feel for chainslack.

Any tips on how much chain slack is allowed or expected??

I will also check and see if its possible to see the cam phaser move while running.

Maybe I will get some closure on the source of the issue. I can post a video.

I may already have the chain play spec in my service book, but if someone knows as a rule of thumb Iíd appreciate the knowledge.
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Old 03-09-2019, 01:21 PM
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Is the tensioner supposed to lock once it extends or is it springy and moves back and forward?

I don't know what to think of the chain tension.

On its own its pretty tight.
If I apply force I can pull down the chain a significant amount, but I don't know if Im retracting the extended chain tensioner and if that is the source of the play.
Once the chain tensioner is retracted, the chain is sloppy but it does tighten back up.

I need to go to the store and see if the chain tensioner is supposed to lock once it extends.

Chain in natural state:
https://www.dropbox.com/*/590n2kkphp...chain.mov?dl=0

Retracting chain by force:
https://www.dropbox.com/*/ztk7swevka...in%20.MOV?dl=0

Loose chain after retracting:
https://www.dropbox.com/*/z6p16k2sbc...in%20.mov?dl=0

(But the chain tightens up again once the engine is rotated).

The timing marks on both cams were aligned and didn't skip teeth.
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