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question concerning engine dyno test

Unread postPosted: Thu Jul 30, 2020 10:47 pm
by enginedynonoob
Hello, I don't know if this is a place I can ask this question. If not please tell me where to post this question please.

If I am at the right place please help me.



I have few questions.
1_My present situation.
*I'm trying to do an ENGINE DYNO VEHICLE EMISSION TEST.
*The ECM I am going to use is not from the vehicle which will be tested. I have an other ECM just for testing from the same vehicle model.

*Once the engine is installed on the dyno bench for the engine dyno test and check for DTC I have Crankshaft Position System Variation Not Learned(P0315) & Lost Communication With Body Control Module(U0140).

*When I try to do the Crankshaft Position System Variation relearn, it won't work.

2_ My questions.

1) Is there no problem for the test even I don't do the Crankshaft Position System Variation relearn?
2) I think that the Crankshaft Position System Variation relearn can't be performed because of the Lost Communication With Body Control Module(U0140) DTC. Is that correct?
3) Is there no problem for the test even if I have Lost Communication With Body Control Module(U0140) DTC ?

Re: question concerning engine dyno test

Unread postPosted: Fri Jul 31, 2020 11:24 am
by decipha
none of that will affect emissions unless the engine is misfiring.

Re: question concerning engine dyno test

Unread postPosted: Fri Jul 31, 2020 11:43 am
by enginedynonoob
decipha wrote:none of that will affect emissions unless the engine is misfiring.

Thank you for the feedback.
Do you have any idea concerning my number 2 question? The reason why the relearn is not being done.

Re: question concerning engine dyno test

Unread postPosted: Fri Jul 31, 2020 12:52 pm
by decipha
On the ford coyotes the relearn is usually not completed due to the software asking for the relearn procedure not being coded correctly

Not sure if the GM your experiencing it on would be similar.

If using hptuners to try the relearn use something else.

Re: question concerning engine dyno test

Unread postPosted: Fri Jul 31, 2020 11:02 pm
by enginedynonoob
decipha wrote:On the ford coyotes the relearn is usually not completed due to the software asking for the relearn procedure not being coded correctly

Not sure if the GM your experiencing it on would be similar.

If using hptuners to try the relearn use something else.


I was using the GM MDI2.

And I have an extra question.
For the engine dyno vehicle emission test I don't have the BCM.
There is only the ECU and Chassis control module(don't remember the exact name... sorry) connected to the engine.

question:

1_ Can the  Crankshaft Position System Variation Not Learned(P0315) DTC pop up because the ECU is not reading the BCM?

Re: question concerning engine dyno test

Unread postPosted: Sat Aug 01, 2020 12:46 pm
by decipha
no idea Im not sure what and where GM stores their profile correction

Re: question concerning engine dyno test

Unread postPosted: Mon Aug 03, 2020 1:23 am
by enginedynonoob
decipha wrote:no idea Im not sure what and where GM stores their profile correction


Thank you. I have an other question.

I have a ECM just for engine dyno testing and I'm going to call it "Test ECM".
The "Test ECM" is the same and has the same calibration as the engine I am trying to do the engine dyno test. (Chevrolet Express van 4500 cutaway)
And I am not using the original vehicle ECM of the engine.
So I am going to use the "Test ECM" for the new engine engine dyno vehicle emission test.

Question.

Before pulling out the engine for the engine dyno test, can I connect the "Test ECM" on the vehicle of the new engine and do the Crankshaft Relearn?
So I won't have to do an other CKP relearn once the engine is on the dyno.

Re: question concerning engine dyno test

Unread postPosted: Mon Aug 03, 2020 11:05 am
by decipha
yep no problem