Rough Idle and car dies

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02-16-2020, 11:44 AM

#41

Cat Man HHR

Senior Member

Join Date: 08-03-2010

Location: Lake Ronkonkoma, N.Y.

Posts: 3,564

Quote:

Originally Posted by donbrew

P0315 means NO DATA for the crankshaft sensor variation. That comes from either a brand new ECM or one that has been erased. Oddly, there is no code for incorrect data.
Those other codes mean that the memory is screwed up in the ECM. A wild guess is that somebody let the positive battery cable touch the ECM housing, that happens frequently enough that there is a TSB about it.

So what came first ?
The ECM codes or the crank sensor code ?
Don't know the order of the codes that were on the scanner.

Also Dark Knight just answered me on his thread about the used engine/crank sensor thing.
The engine runs and he has no crank sensor fault.
So no need for calibration when installing the correct used engine with a correctly working ECM that came with the car.

02-16-2020, 02:08 PM

#42

donbrew

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Join Date: 01-23-2009

Location: Fredericksburg,VA

Posts: 24,740

The order doesn't mean anything no way to tell what came first.

I explained the rest earlier. Needs to be done to run right.

02-17-2020, 02:41 PM

#43

Katrina Roberts

New Member

Thread Starter

Join Date: 03-24-2019

Location: Baytown tx

Posts: 13

Yeah I got one from flashmastersecm.com and they program to Vin and I got to do the 30 min relearn part I think. How do you program the crankshaft sensor

02-17-2020, 03:34 PM

#44

donbrew

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Join Date: 01-23-2009

Location: Fredericksburg,VA

Posts: 24,740

Forget the 30 minute relearn that does not apply to HHR. You will need to go to a shop that has a diagnostic computer like a Tech2 or SnapOn to relearn the crankshaft.

02-18-2020, 11:29 AM

#45

Katrina Roberts

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Thread Starter

Join Date: 03-24-2019

Location: Baytown tx

Posts: 13

Hhr

So your saying i aint gonna have to do anything to ecm but put it on. It's the crankshaft sensor that in going to have to relearn.

02-18-2020, 11:54 AM

#46

Cat Man HHR

Senior Member

Join Date: 08-03-2010

Location: Lake Ronkonkoma, N.Y.

Posts: 3,564

Quote:

Originally Posted by Katrina Roberts

So your saying i aint gonna have to do anything to ecm but put it on. It's the crankshaft sensor that in going to have to relearn.

The ECM has to know what the crank sensor is "seeing". That's what the programming is all about.
The ECM most likely will fix the other codes but not the crank sensor. And I say "most" with fingers crossed.
This is how it's done.