AJM: Find No Errors - Troubleshooting Guide

Hello!
I hope I don't get booed immediately!
I've been reading this forum for many days now, and I've also seen a lot of...
Getting suggestions for my problem!
Unfortunately, I haven't found a solution in most of the posts.
It's about the frustrating search for the reason why my Bora is now consuming so much fuel.
Diesel is wanted!!!
It can't be possible that he's maintaining a constant speed of 150 km/h at 2630 RPM.
7.9 liters is required according to the MFA. Driven on the highway, smooth road, using cruise control!
Or 120 km/h, 2080 rpm, with the same fuel consumption: 6.3 liters!
Am I just imagining this?
According to my opinion and values, LMM should be in measurement group 003.2.
and 003.3, actual value is OK.
Unfortunately, I'm not very good at interpreting large amounts of data, and I'm hoping to find some help here.
to find!! If I record data such as boost pressure, fuel injection volume, engine speed, air mass, and throttle position, how should the driving conditions be?
Full load? Partial acceleration, or constant speed?
Okay, so it seems there was something mentioned about a solenoid valve located above the mass airflow sensor.
Written: How can I verify this, or what are they doing?
I have two of them on the injection molding machine.
The air filter and diesel filter are also new!
Thank you in advance!!

Hi Messknecht,

How many liters of fuel does your Bora consume per 100 km?
The MFA values you wrote don't shock me particularly, as mine (4motion) sometimes uses even more. But what's the point of being so stingy? If it was about that, we would have bought a 3L Lupo.

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Best,

Hello Troubleshooter!
It consumes approximately 8.2 to 8.8 liters per 100 kilometers.
It wasn't always like that! I have to say that 90%...
I mostly drive on the highway, usually using cruise control and maintaining a speed of 150 km/h.
That's roughly 120-150 kilometers per day.
As mentioned before, the engine only rotates at 2630 RPM at a speed of 150 km/h.
When I bought it last year, the fuel consumption was around 6.2-7 liters.
It starts to become noticeable when you do it once or twice a week.
At the tap!

Take a look at the technical articles. Your questions are all answered there. In particular, the technical article "Methodical troubleshooting using VAG-COM" should be helpful.

Regards,
Guste.

Sure, you're welcome!
Sometimes you can't see the forest for the trees!
I'll go through this first and get back to you with any errors or things I don't understand!
OK?!

HELP!!!!
I took the measurements today!
Unfortunately, I'm having trouble adjusting to the change in scaling within the scope.
The maximum value for "mg/r" in the scaling is 1500, and it cannot be changed!
Therefore, it is also not possible to compare torque limitation with air mass limitation and soot limitation.
I borrowed the laptop and the software from my friend, but I'm probably too clueless to figure out how to use it.
Can someone help me?
Can I send the log to someone?
Thank you!!!!!!!!!!!!

You can also view the log in Excel!

Hello!
Could someone please take a look at this?
This morning, I conducted measurements on our test track.
1) Group 8 and 9.
2) Group 11
3) Group 10
Are these values okay?
Unfortunately, I'm only designed for braking or driving dynamics.
useful!
I'm not sure how much the sensors are allowed to differ from each other.
And I'm still missing a few connections regarding soot reduction.
Torque limitation! Fuel injection quantity limitation!
Are these actual values?
Or calculated?
Thank you, and please be patient with a beginner!!!!

1)
Group A: '008
Group B: '009
Engine - Injection - Torque - Smoke - Engine - Limiting.
TIME speed quantity request limitation map TIME speed quantity
STAMP /min mg/R mg/R mg/R STAMP /min mg/R
0.36 2100 57.1 49.7 52.4 0.78 2163 49.4
1.20 2205 56.3 49.1 52.2 1.62 2268 49.1
2.02 2310 55.5 48.9 48.9 2.42 2352 48.9
2.84 2394 54.9 48.6 50.8 3.24 2436 48.3
3.64 2499 54.1 48.3 50.8 4.06 2541 48.0
4.46 2604 53.3 47.8 50.5 4.86 2646 47.5
5.28 2688 52.7 46.9 50.2 5.68 2730 46.7
6.08 2772 52.2 46.4 49.4 6.50 2814 46.1
6.92 2877 51.6 46.1 48.9 7.32 2898 45.8
7.72 2940 51.1 45.6 48.0 8.14 2982 45.6
8.54 3024 50.5 45.3 47.5 8.94 3066 45.3
9.36 3108 49.7 45.3 46.9 9.78 3150 45.3
10.18 3192 49.4 45.3 46.7 10.58 3213 45.3
11:00 3255 48.9 45.3 46.4 11:40 3297 45.0
11.82 3339 48.3 44.7 45.8 12.22 3381 44.5
12.64 3402 47.8 44.5 45.6 13.04 3444 44.2
13.44 3465 47.2 43.9 45.3 13.86 3486 43.9
14.26 3528 46.9 43.6 45.0 14.66 3549 43.6


2)
Group A: '011
Engine - Boost Pressure - Boost Pressure - Duty Cycle
TIME RPM Set Point [mbar] Actual Value [mbar] Solenoid Valve
STAMP /min mbar mbar %
0.40 2520 2091.0 1683.0 43.8
1.22 2625 2091.0 2560.2 81.3
2.04 2688 2091.0 1989.0 66.5
2.86 2793 2091.0 1876.8 66.1
3.68 2877 2091.0 1927.8 64.5
4.50 2961 2091.0 2009.4 64.1
5.29 3045 2091.0 2070.6 64.5
6.13 3129 2091.0 2101.2 65.7
6.93 3192 2091.0 2101.2 66.9
7.77 3276 2091.0 2111.4 67.7
8.59 3360 2091.0 2080.8 66.9
9.44 3423 2091.0 2060.4 66.5
10.28 3486 2091.0 2070.6 66.9
11.08 3549 2091.0 2070.6 66.5



3)
Group A: '010
text
intake, atmospheric; intake manifold pressure; accelerator pedal.
TIME | Air Mass | Pressure [mbar] | [mbar] | Position
STAMP mg/R mbar mbar %
0.81 553.7 989.4 1560.6 37.6
1.63 916.3 989.4 1672.8 100.0
2.44 1053.5 989.4 2478.6 100.0
3.25 847.7 989.4 1836.0 100.0
4.07 857.5 989.4 1866.6 100.0
4.89 886.9 989.4 1917.6 100.0
5.69 916.3 989.4 2009.4 100.0
6.53 931.0 999.6 2070.6 100.0
7.33 935.9 999.6 2101.2 100.0
8.14 935.9 989.4 2111.4 100.0
8.96 926.1 989.4 2101.2 100.0
9.76 916.3 989.4 2101.2 100.0
10.60 891.8 999.6 2070.6 100.0
11.41 891.8 999.6 2060.4 100.0
12.24 891.8 989.4 2070.6 100.0
13.05 886.9 999.6 2070.6 100.0


THANK YOU!!!!!!!!!

Too bad that no one is responding!
But yesterday, I checked the camshaft and PD.
Unit checked! NW was almost good! But PD was partially incorrect.
Up to 180 degrees too open. This could be the cause of the increased consumption.
"Is that it??? I'm also going to disable the AGR (selective catalytic reduction) system today, let's see what happens!"

Quote:

But PD were sometimes Up to 180 degrees too open. This could be the cause of the increased consumption. to be???

Please think before you write.

@messknecht

It's a shame that no one is responding!

It's simply that no one has the time or inclination to sort through the pile of numbers. If you create Excel tables, perhaps even with charts, it's possible to extract information without any problem.

@ Rainer K.
Unfortunately, I'm not exactly sure what happens to the PD elements when they are outside of the tolerance range! Please excuse me!


@syncro peter

These are Excel spreadsheets.
I just copied and pasted it here from the clipboard!
I'll try again soon and make it a bit more organized!
OK?
Thank you!

Here are the measurements again.


1) Group 8 and 9.
2) Group 11
3) Group 10.

Code:

Group A:   '008            Group B:   '009       Motor-   Einspritz-   Drehmoment-   Rauch-      Motor-   Begrenzungs- TIME   drehzahl   mengenwunsch   begrenzung   kennfeld   TIME   drehzahl   menge STAMP    /min    mg/R    mg/R    mg/R   STAMP    /min    mg/R 0.36   2100   57.1   49.7   52.4   0.78   2163   49.4 1.20   2205   56.3   49.1   52.2   1.62   2268   49.1 2.02   2310   55.5   48.9   48.9   2.42   2352   48.9 2.84   2394   54.9   48.6   50.8   3.24   2436   48.3 3.64   2499   54.1   48.3   50.8   4.06   2541   48.0 4.46   2604   53.3   47.8   50.5   4.86   2646   47.5 5.28   2688   52.7   46.9   50.2   5.68   2730   46.7 6.08   2772   52.2   46.4   49.4   6.50   2814   46.1 6.92   2877   51.6   46.1   48.9   7.32   2898   45.8 7.72   2940   51.1   45.6   48.0   8.14   2982   45.6 8.54   3024   50.5   45.3   47.5   8.94   3066   45.3 9.36   3108   49.7   45.3   46.9   9.78   3150   45.3 10.18   3192   49.4   45.3   46.7   10.58   3213   45.3 11.00   3255   48.9   45.3   46.4   11.40   3297   45.0 11.82   3339   48.3   44.7   45.8   12.22   3381   44.5 12.64   3402   47.8   44.5   45.6   13.04   3444   44.2 13.44   3465   47.2   43.9   45.3   13.86   3486   43.9 14.26   3528   46.9   43.6   45.0   14.66   3549   43.6              2) Group A:   '011             Motor-   Ladedruck   Ladedruck   Tastverhältnis TIME   drehzahl   Soll [mbar]   Ist [mbar]   Magnetventil STAMP    /min    mbar    mbar    % 0.40   2520   2091.0   1683.0   43.8 1.22   2625   2091.0   2560.2   81.3 2.04   2688   2091.0   1989.0   66.5 2.86   2793   2091.0   1876.8   66.1 3.68   2877   2091.0   1927.8   64.5 4.50   2961   2091.0   2009.4   64.1 5.29   3045   2091.0   2070.6   64.5 6.13   3129   2091.0   2101.2   65.7 6.93   3192   2091.0   2101.2   66.9 7.77   3276   2091.0   2111.4   67.7 8.59   3360   2091.0   2080.8   66.9 9.44   3423   2091.0   2060.4   66.5 10.28   3486   2091.0   2070.6   66.9 11.08   3549   2091.0   2070.6   66.5 3) Group A:   '010             angesaugte   atmosphär.   Saugrohrdruck   Gaspedal- TIME   Luftmasse   Druck [mbar]   [mbar]   stellung STAMP    mg/R    mbar    mbar   % 0.81   553.7   989.4   1560.6   37.6 1.63   916.3   989.4   1672.8   100.0 2.44   1053.5   989.4   2478.6   100.0 3.25   847.7   989.4   1836.0   100.0 4.07   857.5   989.4   1866.6   100.0 4.89   886.9   989.4   1917.6   100.0 5.69   916.3   989.4   2009.4   100.0 6.53   931.0   999.6   2070.6   100.0 7.33   935.9   999.6   2101.2   100.0 8.14   935.9   989.4   2111.4   100.0 8.96   926.1   989.4   2101.2   100.0 9.76   916.3   989.4   2101.2   100.0 10.60   891.8   999.6   2070.6   100.0 11.41   891.8   999.6   2060.4   100.0 12.24   891.8   989.4   2070.6   100.0 13.05   886.9   999.6   2070.6   100.0

Hopefully, it looks better now.
THANK YOU!!!!!!!!!!

Hi,

"@messknecht: Your name suggests you're familiar with handling measurement data. It would be helpful if you could get Excel to graphically represent the numerical columns. A picture is worth a thousand numbers. Then, I'm sure some people will look at the graphs and try to help you."

Regards,
Sure, here is the translation of the text from German to English:

"Micha"

Well, a diagram would be better, but...

What I notice are the LMM values.

The mass airflow sensor (MAF) isn't providing consistent readings; instead, it's exceeding a maximum value of 1000, then dropping to 850. If all of this is happening with the throttle fully open (100% gas), I would say the MAF sensor is likely failing.

What would be interesting to investigate is the optimal engine speed for achieving the best LMM (air mass flow) value, which seems to be between 1500 and 3200 RPM. Also, the boost pressure, throttle position (100%), and fuel injection volume should be considered.

peter

AAAAAAAAAAHHHHHHH

2. Line 011 Log.

You're getting over 1.5 bar of boost pressure!

Does the VTG adjust easily? Because the EDC is trying to counteract it with 81% PWM.

Otherwise, please send over a combined 003-008-011 log .

m;