Cam/Crank Relearn Problem

Brian Technician Nevada Posted   Latest  
Resolved
Electrical
2008 Chevrolet Corvette Z06 7.0L (E LS7) 6-spd (TR6060) — 1G1YY26EX85117022
P0016 — Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A
Not Able To Relearn

Hello everyone. Need some help with this corvette. . This is one of my friends vehicle that he had someone remove the engine to get it rebuilt due to some problems. Long story short he never got the block back and a year later decide to buy a crate motor and called me to put it in. Everything went well and car starts and drives just fine the only problem I’m having is that i get the check engine light on with code P0116 Crankshaft - Intake Camshaft Position Correlation. I am not able to relearn the cam/crank due to the code pending/stored. Ive tried 3 different aftermarket scan tools and nothing. I’ve also tried deleting the code and relearning it with success but within seconds the code is pending or light comes on. My friend told me that a guy from the dealer told him that he needed an oem scan tool and I’m not sure how true is that. Do i really need a tech2? I have scoped the cam/crank and i keep counting 57 teeth on the CKP but there is suppose to be 58 with 2 missing teeth. Not sure if I’m reading this correctly. The 58th tooth looks different to me looks a lot wider than the rest. This cam/crank sensor came already in the block fyi. Anyone with CKP/CMP know good waveforms. Take a lot at picture #4 the 58th tooth looks so Much wider.

0
William Technician
Illinois
William
   

P0016 is an active fault. Must be troubleshot first, once fixed the relearn will go thru.

0
Ð Awarded
Wayne Owner/Technician
Ontario
Wayne
 

If the P0016 is active, the waveform is good all the way to the PCM and there are no other trouble codes it would seem logically you have an issue with the chain or gearset compatibility. I am not expert in performance tuning but contacting a performance ECU company may be easier than replacing the gearset with something that the PCM finds more palatable for that correlation logic.

0
Ð Awarded
Bruce Owner/Technician
Pennsylvania
Bruce
 

I agree with your assessment. That gap it too wide. They should bee all the same except for the sync gap. Being a reman it's possible the crank got damaged. Pull the sensor and rotate the engine and do a visual. I've seen this on Berine's vids

0
Ð Awarded
Eric Owner/Technician
Wisconsin
Eric
   

My known good looks just like yours as far as the extra wide space before the gap. diag​.​net/file/f5ag0mvez… ​ The cmp and ckp don't line up the same though. This link may help.

+1
Ð Awarded
Helpful
Thanks
Brian Technician
Nevada
Brian
 

Thanks for the know good waveform Eric. Comparing my waveform to yours it looks like my camshaft signal does not match your waveform. The very first tooth on yours starts around 2nd or 3rd tooth and mine starts right on the reference gap. Now that i verified ur CKP signal compare to mine it looks the same but CMP and CKP don’t match.

0
Ð Awarded
Stephen Technician
Tennessee
Stephen
 

I see it that your CKP is about 20* advanced compared to Eric’s known good.

0
Ð Awarded
Eric Owner/Technician
Wisconsin
Eric
 

I checked a few different known good captures with the same system and they all looked like the one I posted. The link I shared shows a lot of engines use the 58 tooth crankshaft sensor. I checked a few different engine sizes too and their known goods looked the same as well.

0
Ð Awarded
Brian Technician
Nevada
Brian
 

What are the chances of the crate motor from the dealer being off just a slight bit in timing. I know anything is possible. Any suggestions on going about this besides taking off the timing cover and checking if the timing is correct.

0
Ð Awarded
Eric Owner/Technician
Wisconsin
Eric
   

I can only eyeball your capture so this is close but not 100% accurate. I measured the difference between your capture and mine and it looks to be about 16 camshaft degrees variation. Since a 44 tooth camshaft gear works out to be about 8.2 degrees per tooth (360 degrees divided by 44 teeth) I would guess the timing chain is off two teeth. You could pull a rocker cover and by using a degree…

0
Ð Awarded
Raymond Mobile Technician
Michigan
Raymond
 

I say anything is possible ( human error) trust your labscope crank and cam waveform. compare to know good and known bad maybe waveform library from IATN and maybe pico library, like the other techs that post a waveform there is a slight diffrence

0
Ð Awarded
Raymond Mobile Technician
Michigan
Raymond
 

Hi Brian, about 90 percent of time when I have a correlation code it’s typically the timing chain issue, maybe its off by a hair or under load it changes and sets code, my question is. in scan data maybe cam actuator data, see if u have a actual and desired, and variance cam degrees intake and exhaust and see what the PCM is seeing, sometimes u can power brake in reverse gear or go on test…

0
Ð Awarded
Brian Technician
Nevada
Brian
 

It does not have VVT on this engine. This motor is straight from the dealer. No aftermarket motor.

0
Ð Awarded
Raymond Mobile Technician
Michigan
Raymond
 

thanx, yea I wasn't sure if it had VVT, just was mentioning a technique I use looking at data b4 even leaving drivers seat. The aftermarket parts I was referring to was the cam and crank sensor being aftermarket, I don't know if u changed them, just a thought , I consider them very essential thanx

0
Ð Awarded
Brian Technician
Nevada
Brian
 

Both cam/crank sensor came in the block.

0
Ð Awarded
Brian Technician
Nevada
Brian Delay
 

I want to thank all of you techs that responded. We finally got the insurance company to approve removing the timing cover to inspect/fix timing issue. What a hassle with insurance company tho. Once resolved i will repost with pictures. I appreciate the time that was taken to read and respond to this post.

0
Delay Ð Awarded
Brian Technician
Nevada
Brian Resolution
 

Many thanks for the techs that replied. I want to thank Eric Diedrick for the know good CMP/CKP waveform. After the hassle of going back and forth with the insurance company they approved the repair and while doing the repair come to find out the timing was off a tooth. I have some pictures but they are not great i had the service writer take them for me and he took some bad angles so its hard…

0
Resolution Ð Awarded
Eric Owner/Technician
Wisconsin
Eric
   

Nice job, glad I could help. I always remember what NEW stands for, Never Ever Worked. That helps me figure things out even when I know the part is new.

0
Ð Awarded