Autonerdz forums

Good morning Albi,

There is a lot to unpack here.

For a high pressure fuel system to work properly it must have adequate supply pressure. Have you verified your low pressure fuel supply to the high pressure fuel pump? How much pressure is available to the HPFP? Is it 4.0-7.0 BAR?

According to the internet this system defaults to low pressure which means the regulator solenoid is responsible for increasing fuel pressure when energized.

I seem to remember that even if the high pressure fuel system were disabled most engines will start and run on just the low side fuel pressure alone. They wont run well, but they run. Does this engine start at all?

Is there fuel in the tank?
Is the fuel in the tank actually gasoline?

500ms/div screenshot

What is the distinctive engine code/letters?

Albi wrote on Aug 10^th, 2026 at 4:32pm:


This is an excellent start.

Albi wrote on Aug 10^th, 2026 at 4:32pm:


I only asked because I've seen it bite good techs in the past.

Albi wrote on Aug 10^th, 2026 at 4:32pm:


This is why these forums are here. We'll help you get things sorted.


Here are a few notes on the capture you posted. (2016_Tiguan_Guided_test1_-_Copy.psdata)

Your time on screen is too short.
The 20ms/Div means we only have 2/10ths of a second per page and that's not enough to see whole crank or cam revolutions. Bump your timebase up to 500ms/Div.

Your sample rate is higher than needed but its not hurting you. Changing over to a fixed Sample Rate of 1MS/s will give you enough resolution for these captures while keeping your saved file size manageable.

Its a best practice to label your traces if you're going to post them. In this case I think we can figure it out but when your captures get more complex labels help keep the chaos at bay.

Be careful when making timing decisions with VRS signals. in Reply #3 your CKP screenshot shows the negative signal. In Reply #4 your screen shot shows the positive side of the signal. Keep in mind, on Floating VRS sensors the two traces are a mirror image. This means the top of a tooth on the positive trace correlates to the bottom of the tooth on the negative trace. I attached the VRS_Polarity pic below to help show my point. Most people try to use the positive trace to keep things consistent.

I created a .psdata file you can use as a template to redo your CKP/CMP capture. I labeled the channels, set the time base and sample rate.

Bonus points.
If you use a trigger to start your capture you can guarantee you'll get your crank event all on one screen. I would do a single mode trigger on the rising edge of the crank sensor signal at 2 volts with 5% pre-trigger.

When you save your capture you can keep your file size down by removing any unnecessary pages in the saving process. See Page_trip pic below.

Lastly, you can add up to 5 attachments to your post by clicking the little plus symbol near the word 'Attachments" to the left of your screen. See Pic.

Albi wrote on Aug 11^th, 2026 at 5:55am:


There is a 30MB size limit on attachments for the forums. This is why I showed how to trim pages and manage your saved file size.

I am meeting with the web developer in 10 minutes to hammer out a solution so you can upload captures to our drop site again.

https://www.dropbox.com/t/qs5hZfs04DscxeEI

I just uploaded my capture to dropbox. Let me know if you can open the link. SHould i tear the engine down again, or this doesnt necessarily show that my timing is off?

can't open it.