2001 vw beetle APH 1.8T Cam and Crank waveform needed

Greg Technician Colorado Springs, Colorado Posted   Latest   Edited  
Question
ATG - Automotive Training Group
Driveability
Propulsion
2001 Volkswagen Beetle GLS 1.8L (APH) 5-spd (02J)—3VWCC21C71M407530
16725 Cmp Ckt Range Perf
Limited Throttle

Greetings, looking for known good Cam and Crank waveform for this 2001 vw beetle 1.8t APH. Vehicle had water pump done at another shop, and now limited throttle at times. Many thanks!

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Chris Diagnostician
Commack, New York
Chris Default
 

I have a known good for a early 2.0t (belt driven). This is basically the same engine. I marked on yours where that one lies vs. your capture. You are only about 6 degrees off. for me, that's not a lot. I would attribute that to rear chain stretch more than anything.

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Ray Diagnostician
North York, Ontario
Ray Default
 

This is my known good cmp, ckp

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Phil Manager
Denver, Colorado
Phil Default
 

You should not need crank and cam waveforms but you can go to measuring value block 90 through 94 and see what timing is measured at or just look at the timing belt as well

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Sean Technician
Cincinnati, Ohio
Sean Default
 

Idk, I'd trust a scope so I could verify 100 percent the signal looks good, even though the pcm never misinterprets wonky signals, and you could know if the signal is dropping out. That's me though.

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Greg Technician
Colorado Springs, Colorado
Greg Default
 

Thank you - tried that: Oddly enough, not a single scan tool in the shop will show data on those groups. Tried Autel, Snap-on, and VCDS. The vehicle is a '1C'.

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Nicholas Diagnostician
Brooklyn, New York
Nicholas Default
   

Hi, I found this. Hope it helps. Same year, model and engine.

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Greg Technician
Colorado Springs, Colorado
Greg Default
 

Yes, definitely helps, Thank you!

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Hans Diagnostician
Salt Lake City, Utah
Hans Default
 

I can't believe I don't have a known good in my library, but your's looks pretty much right on. Enough that I wouldn't think the belt is off a tooth.

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Greg Technician
Colorado Springs, Colorado
Greg Default
 

Thank you, Hanz. Front Cam/Crank is lined-up ok. Some of the waveforms given here seem to show the rear chain may be advanced by 6-12 degrees, depending on whichone is 'normal'.

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Richard Technician
Stony Brook, New York
Richard Default
 

I would triple check those timing marks. Use the timing marks on the flywheel too, not just the cam and crank gears. To me, comparing to Ray's youre timing is off about 13 degrees. Considering how many teeth are on that cam shaft sprocket, I could see it being up to 2 teeth off.

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