Good Crank Cam Correlation Waveform

John Owner/Technician Mount Pleasant, Pennsylvania Posted   Latest  
Question
Driveability
2018 Subaru WRX Premium 2.0L (FA20F) (TR690)—JF1VA1A64J9809595
P0016 - Crankshaft Position - Camshaft Position Correlation Bank 1 Sensor A

Need good crank cam correlation waveform thanks

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Caleb Diagnostician
Mishawaka, Indiana
Caleb Default
 

Can you do an RC test with an FLS in the intake too help you? Or a WPS 500 in each bank an compare. I dont have a known good.

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Stephen Technician
Gallatin, Tennessee
Stephen Default
 

Since the fault is bank 1, can you compare it to bank 2?

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John Owner/Technician
Mount Pleasant, Pennsylvania
John Default
 

It only sets at 2500 rpm under load

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Jonathan Educator
Concord, California
Jonathan Default
 

John: Good afternoon Sir, I hope this message finds you doing well. Attached is a waveform from a 2012 Subaru 2.0 Liter. I hope this helps

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John Owner/Technician
Mount Pleasant, Pennsylvania
John Default
 

Thanks

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Leo Technician
Rhinebeck, New York
Leo Default
 

Hi John- if cam crank correlation doesn’t shed light on why the code is setting, there is a humongous Subaru bulletin covering this issue that I could give you the cliff notes on.

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John Owner/Technician
Mount Pleasant, Pennsylvania
John Default
 

That would be good I did see any tbs on Mitchell or all data thanks stay safe in New york

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Leo Technician
Rhinebeck, New York
Leo Default
 

It's bulletin 02-163-16R, and it's 29 pages long. I'll give you some key takeaways: one thing not mentioned until late in the procedure is that if any of the "learned values" in the ECM have drifted past acceptable margins, the ECM will need to be replaced. It only takes a second to read those pids in the live data, so it doesn't hurt to check them first thing. As for nailing down the culprit…

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John Owner/Technician
Mount Pleasant, Pennsylvania
John Default
 

My question is the vvt initial position learning value # 1 and 2 say they are b1 82.3 ca and b2 83.5 ca b2​.​programmed in at factory over time those will change as chain wears ? It may change to say 83.5b1 and 85.6 b2 and then put a new chain in it when you reset ecm they should go back to b1 82.3 and 83.5 b2 never be 0 ca

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Leo Technician
Rhinebeck, New York
Leo Default
   

Hi John- I'll relay what's been explained to me in the past. When there is a problem with a cam's AVCS performance due to a failed control solenoid or sprocket, the learned values can be forced out of margin. If your values are currently between 68.5 and 88.5, then this has not happened. If the value was outside of those numbers, an ECM "reset" will not accomplish anything. If an ECM's values…

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