LMM: Another Instance?

Hey everyone,

seit einiger Zeit habe ich Leistungsprobleme mit meinem Golf 4, Bj98, 110 PS, gechippt bei *** auf 130 PS. Er lief anfangs super, hat dann aber plötzlich mit leistungsmäßig nachgelassen, geht jetzt ungefähr so wie mit original chip. In meiner VW Wrekstatt wurde leider kein Fehler gefunden, sodass ich jetzt mal selbst auf Fehlersuche gegeangen bin. Und weil ich schon desöfteren von verschmutzten Lmm geöhrt hab, habe ich dieses Teil mal ausgebaut und dabei ist mir folgendes aufgefallen: auf der Unterseite befinden sich zwei kontakte, in die offensichtlich ein Draht mit einem Widerstand gehört. Dieser draht ist aber nicht (mehr) vorhanden. Beim Lmm am Audi (V6 TDI 150PS) meines Vaters ist dieser Draht aber da. Nun ist meine Frage, ob dieser Draht nur bei bestimmten Modellen mit größerem Luftdurchsatz, vorhanden ist, oder ob der sich bei mir irgendwie gelöst hat und der motor deswegen nicht zieht. Meinermeinung nach ist doch aber dieser Draht mit dem Widerstand das eigentliche MEssinstrument im Lmm (Brückenschaltung). ViePerhaps someone here can offer advice; thank you in advance.

greetings
jeans

This wire is no longer present. In my opinion, this wire and the resistor are actually the measuring instrument in the LMM (bridge circuit).

'You're mistaken about that (I experimentally determined this, as cleaning didn't improve the situation). The wire isn't the actual measuring instrument; instead, there's a hidden metal tab in the lower third of it, and the sensors are likely located underneath.'

'My colleagues with 1.9 TDI engines also don't have that wire, and their engines run normally.'
Spray the lower part thoroughly with brake cleaner from the spray can, including all the holes and other openings in the bottom third of the mass airflow sensor (MAF). } It worked wonders for me!

Hello,

Let me make one very important clarification:

If you are not sure whether the HFM is measuring values that are too low, it is better not to spray or tinker with it unnecessarily.

Cleaning with brake cleaner or a similar product is the last resort to reactivate a mass airflow sensor that has been identified as "faulty."

Because aggressive cleaning agents and/or careless handling can very well damage the part.
It's annoying when the power loss wasn't actually due to the mass airflow sensor...

Best regards, Rainer.

@Kruegerjean

How about you try logging the data from the mass airflow sensor (MAF) using VCDS and comparing it to the target value table according to your engine control unit (ECU). That way, you'll be certain whether it's the MAF or not! Also, use the search function. This is a common issue here on the forum. You should find everything you need to know there!

Hello,

The LMM test for a Volkswagen Golf is performed as follows:
Warm engine - Connect VAGCOM.
Measurement block 010 - it's best to run a logging process.
In second gear (automatic transmission, 2nd level), full throttle at 1500 rpm.
Set the marker at 3000 rpm and note the throttle position.
100% - it's best to do it multiple times and then put it all together.
Please review the Excel file regarding the lower tolerance limit for...
is 810 - usually, the maximum flow rate doesn't exceed 650.
700 when they are older. I have already cleaned them several times.
'Tried it, but it doesn't really help much if the mass airflow sensor has over 100,000 kilometers (or miles) on it.'
It's better to order directly from a parts supplier. I also have some...
I checked on eBay. Since the mass airflow sensors (MAF) are often sold used there...
are and no reliable information about their age is available.
I'm not going to do that! Also, I'm not giving away €100.
'Why would I buy a used one when I can get a new one for just a little more?'
Get €200!
Two weeks ago, I replaced the mass airflow sensor (MAF sensor) in my Volkswagen Golf.
Success is overwhelming! On Saturday, I took the test at a...
'I did a T4 test (tolerance value of 700), but the result is only 535, which is the maximum.'
He drives one too - the new one has already been ordered!

Hello,

First of all, thank you for the responses. I have tried to rule out all the potential causes of the performance issues that were described in the forum and that can be identified with the naked eye.

I guess I'll probably have to buy one of those diagnostic connectors myself.
I have another question for you right away (it might be a silly one):

An original diagnostic tool for reading error codes from vehicles like VW and Audi is being auctioned on eBay. Can this device also be used to log data, or does it only read error codes directly?

It would be great if someone could respond soon, as the auction is about to end.

Greetings.
Jean.

Why don't you build or have someone build an adapter here from the forum to work with a PC/laptop? The corresponding software is much more user-friendly than the original VW device!

The corresponding software is significantly more convenient than the original VW device!


ok, that's what I wanted to know.

Why don't you build or have someone build an adapter here from this forum for a PC/laptop

I suppose I'll do that now.
I don't have my own laptop right now, and if the original part from VW is better, then it would make more sense to spend money on that.
Let's see, maybe there's still an old laptop lying around somewhere in the company.

greetings
Jeans.

It's running on my system with a 486 DX2 processor and 4MB of RAM, so it's not exactly state-of-the-art!
'But a Pentium (P1/P2) laptop should be relatively inexpensive, right?'

The original VW diagnostic tool was sold on eBay for €310.
If I add up the cost of the VAG COM software (299) and a used laptop (150 euros), it would have been a slightly cheaper option.
Well, no offense intended, but maybe I can find a laptop somewhere for cheaper. It's definitely going to be less expensive than constantly paying the mechanic €75 per hour just for him to keep saying he can't find anything wrong.

The software is free of charge. The free version is quite usable! The homemade adapter costs a maximum of 20 euros, and as you said, the laptop costs 150 euros...

The demo version is sufficient; that means I can record all the relevant data with it?
Well then, all the better .

Hello,

To get back to the topic of 'LLM,' I did something last night.
A new mass airflow sensor (MAF) was installed in the T4 (cost: €192!), and now it runs perfectly.
Tested with VAGCOM: it shows a value of 880! Cleaning definitely didn't help.
'This resulted in improved measurement readings. After that, I...'
Passat mit AFN 150TKM, mit Original LMM gemessen. Result: brings.
655 (The tolerance value for AFN in the Passat is 850!)! I've taken another one.
ordered!
What I simply can't understand is the following: why isn't Bosch...?
Is Volkswagen capable of building a sustainable long-term mobility solution, or why is it changing course?
not the supplier for the mass airflow sensor (MAF). My parts dealer told me about...
'Customer feedback indicates that the service is needed every 10 to 12 months (40,000 to 50,000 kilometers).'
einen neuen LMM holt. Der kennt die Symptome schon. Really great!
Business for Bosch and VAG.
By the way: all the mass airflow sensors (MAF) that I replaced due to poor performance.
had between 100,000 and 150,000 kilometers on the odometer (models like Golf, Octavia, Passat, or T4).

Hello,

To get back to the topic of 'LLM,' I did something last night.
Installed a new mass airflow sensor (MAF) in the T4 (cost €192!). It's running great now.
Tested with VAGCOM: it shows a value of 880! Cleaning definitely didn't help.
Improved the measurement readings. After that, I did another...
Passat mit AFN 150TKM, mit Original LMM gemessen. Result: brings.
655 (The tolerance value for AFN in the Passat is 850!)! I've taken another one.
ordered!
What I simply can't understand is the following: why isn't Bosch...?
Is Volkswagen capable of building a sustainable long-term mobility solution, or why is it changing course?
not the supplier for the mass airflow sensor (MAF). My parts dealer told me about...
'Customer feedback indicates that the service is needed every 10 to 12 months (40,000 to 50,000 kilometers).'
einen neuen LMM holt. Der kennt die Symptome schon. Really great!
Business for Bosch and VAG.
By the way: all the mass airflow sensors (MAF) that I replaced due to poor performance.
had between 100 and 150 thousand kilometers on the odometer (Golf/Octavia/Passat/T4).


because it brings coal?!

Hi everyone,

'I once removed this part and noticed the following: on the underside, there are two contacts where a wire with a resistor is supposed to be connected. However, this wire is missing. On the Mass Air Flow (MAF) sensor in my father's Audi (V6 TDI 150PS), this wire is present. Now my question is whether this wire is only present in certain models with higher airflow, or if it somehow came loose on mine and that's why the engine isn't performing well. In my opinion, this wire with the resistor is actually the measuring instrument in the MAF sensor (a bridge circuit). Perhaps someone has advice, thank you in advance.'




There are two types of LLMs.

Hot-wire mass flow sensor.
2. Hot-wire mass airflow sensor (on newer models).

Regarding Large Language Models (LLMs).

I received my sixth set of tires in a year and a half today; the last set only lasted 4,000 km or 2 months!
The measurements were far below 600mg!
The modification regarding afterglow has already been done on my vehicle a long time ago.

Okay, the mass airflow sensor is still under warranty right now, but it really can't be that.

My mechanic said that Audi is now measuring the air mass again using a vacuum sensor because the mass airflow sensors (MAF) haven't proven to be reliable. Is there any truth to that?

What alternative would there be for a 12/98 AFB then? I can't and don't want to stock up on several mass airflow sensors just because they keep breaking down.

Then I will sell the box and buy something Japanese...

Stefan.