CASE Relearn - FIXED

[Spindoctor]

I am still working this 60 Corvette Correction Vette. With the 05 LS2 GTO drive train.
I have been unable to get the CASE relearn to function. It faults out with an
' FI or Ignition fault' present (thats all it says).

While looking at live data I came across an interesting reading.
This may seem like a 'No Duh' question but when you are looking for an odd issue you have to check all the basics.
Under live data and at idle the cam sensor RPM is almost correct @ 1/2 of crank, but as you increase actual RPM's to over 1000- cam and crank RPMs read the same!
Please tell me this is not normal!

Last time I came across an issue like this was on a cup Porsche that had a cam sensor shield wire in contact with the crank sensor sig. wire. Thus when looking at the output you saw two crank signal RPMs- causes poor running.

Also I have noted that there is no Relay Feedback circuit at C1 18 also known as accessory voltage.

[Spindoctor]

Looking to see if any one has anything to add to the info supplied by the 'Tech 2' in reguards to the relearn procedure.

According to the list the scantool monitors CKP function, CMP function and
coolant temprature. Any errors to these would fault the relearn.

There is no Brake circuit monitor mentioned. Some have indicated that if the monitor does not see the Brake switch function the test will also fault out.
The brake switch circuit does check in as functioning.

I just want to know if anyone has any more info related to the various monitors that may be faulting out the procedure.

Still looking for info on the CMP RPM reading issue as stated in previous post.
This may be my relearn issue. But, I do not have another LS2 to compare to at the moment. Again- both the CNK & CMP show the same RPM at speeds above 1000 RPM.

Thanks in advance- Tim H The SpinDoctor

[GMPX]

Currently the EFILive software doesn't perform the CASE relearn on the E40 ECM, however, that will be out very soon. I'll be working on that in the morning, I'll look at what conditions need to be met for it to work.

On the cam/crank RPM issue

Cheers,
Ross

[Spindoctor]

I realize that the CASE relearn is not part of the program yet.
However, the Genesis OTC I have does.
I obviously have a fault in the system that is supressing the completion of the
CASE relearn.
While looking at the live data one of the odd readings that jumped out
was the CMP reading at actual CNK RPM and not at half speed as I believe it should.
What I wanted to know is if someone could verify this with a known good system. Does thier system read (for exsample) 2000 rpm CNK and 1000rpm CMP. This one reads 2000 rpm @ BOTH outputs.
If this is the case then I need to shake down this cutom harness for shield wire induction.
If not, then I can move on to other possibilities.

Please feel free to call me @ 425-869-8324 Redmond, WA

[Spindoctor]

I have been thinking that the live data stream read out of the CMP sensor
might be the systems interpretation of the engine rpm based on cam tooth count and not the actual cam rpm.

Any body think they can second that?
Maybe someone could plug into their LS2 and verify a like readout?

[Spindoctor]

I found that the brake sensor input for the torque control (normally closed)
had been wired to power continuously- never allowing that circuit to see brake enable (open when depressed).
Once repaired the relearn functioned normally and all the power is back!

[joecar]

Spindoc (Tim),

Cool... good job... ...I love when troubleshooting ends well...

I wonder who wired it like that and why...?

Cheers
Joe

(I merged your 2 threads so that the symptom and the fix can stay together.)

[Spindoctor]

I believe it was do to the fact that the project was completed through three different shops with three different harnesses.
The FAST harness for the ECM et all.
The American Wiring harness for the chassis.
And The Dakota Digitals harness for the gauges.
Somewhere along the way a couple of Items were just missed.
As a final destination that is how we get many of our cars here at the dyno.
"Make it work" is what we do.

[Scoota]

That's not uncommon to happen in our industry of tuning. We (the tuners) quite often have to correct things that were done by others. It's the nature of the beast.

It's good to see you were able to sort it out.

Cheers Scotty.

[GMjohn]

Tim,

Out of curiosity, did it need to see a change of state or just brake applied??

Nice car by the way, I was curious how that ended up working out.

John
Everett,Wa