Crank position relearn?

[DDiesell]

Working on a 2016 lml. Truck had a broken crankshaft. Replaced crankshaft. Does crankshaft position need to be relearned? I know it does on some GM vehicles. Truck runs and drives but has p02CD cylinder 1 injector exceeded limits and p02D3 cylinder 4 injector exceeded limits.


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[gmduramax]

I believe that’s only gas vehicles and it would throw a code specifically for the crank position relearn, but they generally relearn by themselves.

 

[DDiesell]

Ok. Seems odd that those 2 would be top dead center. No injector codes prior to broken crankshaft.

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[1FastBrick]

The relearn syncs the proper timing sequence.

Any time you change a cam or crank sensor, and ECU, or in this case the crankshaft, You should perform a relearn.

The generic data Is good enough for it to run but sometimes there are variances that could be outside the expected range. This is when you would get a code.

 

[DDiesell]

So there is a relearn procedure for lml?

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[DDiesell]

My modis says the relearn is not supported. The only numbers that I can see that are off are injector command (ms). 1 and 4 are alot lower than the rest.

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[Chevy1925]

cam and crank sensors as well as reluctor wheels are fixed. There is no variable timing on a LML so there is nothing to relearn.

 

[DDiesell]

I swapped injector 1 with 7 and no change. So obviously not an injector issue. IQA values are all set correctly. Is there a way to reset fuel tables on LML?

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[matty169]

Did you check for bent, twisted or shortened rods?

 

[JoshH]

Were the valves adjusted correctly? Have you checked compression?

 

[ripmf666]

Was all the timing marks lined up when it was reassembled.

 

[duramaxnate]

Did the crank break at the front of the engine where they usually do? Reason I ask is because Cyl 1 is the first cylinder in the firing order and Cyl 3 is the last one. I have seen though (not on lmls but same concept I would assume) when a crank breaks, it can possibly do some damage to the connecting rods, Some have twisted and I have seen some bent just the slightest. With "short" rods, that would throw off cyl compression making those two injectors not happy campers.. That is the only thing I could honestly think of.

 

[S Phinney]

Is this the same injectors that we’re in it?


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[DDiesell]

Rods all checked out. Same injectors as before. Everything is in time. Compression is good in all cylinders. I did a reflash to reset all of the fuel tables. Now it has injectors 1,3,7. Sounds like it has fuel knock like injector timing is advanced.

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[Nickracer9]

Are you sure the reluctor wheel didn’t get damaged?

 

[DDiesell]

I didn't think so but that's what I'm leaning towards.

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[DDiesell]

Update. I read something about driving the truck from 40-65 and repeating it about 30 times to relearn. I tried it. No codes now and truck runs smooth.

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