1 Fault Found: 17965 Charge Pressure Control P1557-35-10 - Positive Deviation - Intermittent

Andi

Andi

Member
Albania
Hello, I have a problem with my Lupo 3L car. The car goes up to 100 km/h and has no power. It goes up to 3000 rpm and doesn't go any further. What could be the problem?
 

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Evening,

Unfortunately I’m unable to add any ideas of what the exact cause or remedy could be but here’s what Ross Tech document for your specific fault code:

17965/P1557/005463 - Ross-Tech Wiki

wiki.ross-tech.com wiki.ross-tech.com

IMG_1940.jpeg


I’m sure someone more knowledgeable will be one soon enough to give you a few pointers on top of what is suggested on the above screenshot.

Kind regards,

Tom
 
I would think that if the boost pressure is too high, the ECU would trigger Limp Mode, to protect the engine.
So, P1557 could well be the cause of your problem.
You need data from the engine controller, while the fault condition is present, to check it out.
You can get that by logging Measuring Blocks, with VCDS.
Log the Engine Controller, Group 11: Charge Pressure Control
Block 1, Engine Speed, RPM.
Block 2, Boost Pressure, Specified, (by ECU).
Block 3, Boost Pressure, Actual.
Block 4, Charge Pressure, Control Duty Cycle. (Control Voltage to the N75).
Post the log file, a .csv spreadsheet, here.

To upload the csv, first change the file type from csv to txt. Good luck.
Mac.
 
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There are two valves, one is placed upside down and the other is placed up. I replaced the one on the right side with one like the one in the photo, but is that wrong?
 

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Hi @Andi,
I do not remember, have you access to VCDS?
Some data logs would be worth it.

I replaced the one on the right side with one like the one in the photo, but is that wrong?
Click to expand...
Could you access the workshop manuals online for the Lupo 3L?

🙂🤞
 
Andi said:
There are two valves, one is placed upside down and the other is placed up. I replaced the one on the right side with one like the one in the photo, but is that wrong?
Click to expand...
You have a reported fault of high boost pressure. That doesn't mean that the N75 is the cause. You're guessing.
For example, the boost pressure sensor may be faulty, and reporting a falsely high boost pressure, which is triggering Limp Mode.
Unless you log data, as I've suggested, you will probably change many parts before you get lucky, if you get lucky.
Mac.
 
Hi @Andi,

Can you find a diagram that shows the location of the hoses for the Lupo 3L N75 boost control system?

At this point we are following the Possible Solutions listed in the Rosstech screen shot above that @2work has provided for us.


EDIT
May I ask you what method are you going to use to check for leaks in your hoses?
 
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Are these different from each other? I bought a second hand one from a car like mine with the same engine. But the one on the left I put on the right because they look the same to me but I wanted to know if there is a problem if we change the places are there any specifications do the valves differ from each other
IMG_5982.jpeg
 
Hi @Andi,
I don't know the Lupo engine or have a workshop manual for this car.
I will be unable to assist you any further without a workshop manual.
🙂👍 good luck and follow the Rosstech possible solutions.
 
I believe

White top controls turbo
Black top controls EGR

I have no idea if they are interchangeable but as they have different part numbers and colour I would be suspicious!

Back in the day loads of garages replaced turbos on VAG cars (I did hardly any turbos) , but I suspect the N75 turbo boost control valve (fitted a fair few!) was the real suspect and is certainly a great place to start!
 
Sounds like you’ve got sticky vanes on your turbo to me. Happens to my 1.2 occasionally if I forget to do my fortnightly cleanse, which involves getting the car up to temperature and then on a fairly steep incline, take it out of ECO and floor the accelerator. It should kick down and you’ll know it’s worked if there is a sooty cloud behind you. I usually like to do it on the A40 whilst being tailgated.

You will need to clear the fault code first likely though as I suspect you’re effectively in limp mode. I think it’s positive pressure deviation, can’t remember the code though.

Edit- I’ve just looked at your photo. That was a good guess wasn’t it!
 
Can someone tell me what valve I should install? Send me a photo so I can find out what to keep in mind and what code it should be and how it should be installed? Are there any specifications?
 
Andi said:
Can someone tell me what valve I should install? Send me a photo so I can find out what to keep in mind and what code it should be and how it should be installed? Are there any specifications?
Click to expand...
Go to:

Lupo / Lupo 3L TDI (LU) Parts catalog EUROPA | 7zap OEM Catalogs for Finding Auto Parts by VIN and Parameters

Lupo / Lupo 3L TDI (LU) volkswagen EUROPA Parts catalog, All modifications of the model Lupo / Lupo 3L TDI EUROPA, spare parts
volkswagen.7zap.com volkswagen.7zap.com
Choose your year, go to engine, find Exhaust Gas and Turbocharger, find your engine, find the part, (N75), you are interested in, and look at the part number in the listing.
Mac.
 
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