Read data from AKL control unit, meaning of individual fields

Hello,
I have a problem with my Golf IV with AKL engine (1.6 liter, 74 kW) from 1999. While it's a gasoline-powered car, maybe someone can still help me.
I own the VAG-Com diagnostic tester kit and have connected it to my car to diagnose some issues. The car sometimes stalls when idling and occasionally misfires, and it also has very little power. Everything is normal when starting the car and for the next 10 minutes, but then the described errors appear. The intake system must be airtight, I haven't been able to find any leaks, and the spark plugs are also fine.
Subsequently, I connected the tester.
While the units for each field are identifiable across the different groups, the specific values represented by the measurements are not clear. Maybe someone could help me, if there is a corresponding decryption table.
I am particularly interested in the following values.
Group 1, Field 3 and Field 4. For Field 3, only one voltage should be specified. This fluctuates significantly between 0.1 and 0.78 V. What is the tension (where is it measured)?
Field 4 in Group 1 is a binary value that also changes significantly, but I cannot assign it to any function.
Furthermore, I have a question regarding fields 2 of group 2 and 3. These should, in principle, be identical due to the "mg/stroke" unit, which refers to the current air mass. However, they are not always identical. I recorded the values using the VAG Scope, and I noticed that there were sometimes significant differences and jumps in the value of group 3, field 2, particularly during acceleration, while the value of group 2, field 2, remained plausible. There are no error codes or only "RPM is implausible".
Has anyone any idea what the fields mean, or what the fault in the car could be (LMM, throttle, lambda sensor, speed sensor)? I don't want to replace all the components, but if possible, just the defective one.
Best regards, Sven

[Translating...]

Hallo Sven,

poste doch mal die VAG-Teilenummer Deines Motorsteuergeräts.

Viele Grüße, Rainer

I don't have the number of the control unit right now. I need to check it again tonight. It was a Simos control unit.
Best regards, Sven

Okay, I've now managed to diagnose the problem.

Vag Number: 06A 906 019 AK
Component: 1.6L 2V/R4 Simos HS2597
Soft Coding: 04000
Shop: WSC 00028

Nice of you to check.

Then there was indeed an error code: 00513 Engine Speed sensor G28 27-10, Inplausible Signal, intermittent, and sometimes no signal.
I then decided to tackle this crankshaft sensor. At operating temperature, the resistance is 1080 Ohms, and at cold, it's 800 Ohms. I think that's a bit high for a hall sensor sensor coil. Could someone please tell me what the maximum acceptable resistance value is (target value)? Otherwise, I'll just replace the part, it can't be that expensive.
What is surprising, however, is that the RPM is still displayed despite the above error. Is there another sensor, or does it calculate the value based on other parameters?

Thank you and best regards, Sven

[Translating...]

Hallo Sven,

die 409.1 Distribution im Shop hat Labeldateien für Dein STG, einfach mal in Deinem Kundenaccount runterladen:
http://shop.dieselschrauber.de/support-downloads.php

Falls Deine Hardware nur VAG-COM 311.2 unterstützt, kannst Du auch nur die
http://www.ross-tech.com/vag-com/download/label-files/06A-906-019-AEH.lbl
herunterladen und als Datei 06A-906-019-AK.lbl im Label-Ordner Deines VAG-COM Installationsverzeichnisses abspeichern.
Die Datei dürfte es auch in deutsch geben, einfach mal gucken.

Passt die Montagestellung des Gebers oder kann man da noch etwas verschieben um ein stabileres Signal zu bekommen?

Grüße, Rainer

Another question:
Wie ist denn jetzt der Soll-Widerstandswert von dem Motordrehzahlsensor G28 zwischen dem gelben und dem weißen Kabel? Ich habe 800 Ohm kalt und 1080 Ohm warm. Are the values still okay, or should I replace it?
Best regards, Sven

harri006 wrote:

As a result, I decided to replace this crankshaft sensor. At operating temperature, the resistance is 1080 Ohms, and at cold temperature, it's 800 Ohms. I think that's a bit high for a hall sensor sensor. Can someone please tell me what the maximum resistance value (target value) can be?

Hi Sven,

As far as I know, 1 kOhm is OK. It's actually not a hall sensor, but a "real" coil