Golf 4 1.9 TDI with ERX transmission

Hi everyone,

It's about a Volkswagen Golf 4 TDI 1.9 with an automatic transmission.

Engine identification: AHF.
Gearbox identification: ERX.
Expiry Date: 11/99

Does anyone have a useful guide on how to change the ATF fluid in this transmission?
I'm particularly interested in the filling process and the fill volume.

The transmission has 257,000 km on it and still has the original oil.

The transmission is fully functional and operates flawlessly.

However, if I drive at a constant speed between 60 and 90 km/h and keep my foot on the accelerator very gently, I experience fluctuations in the engine speed of approximately 50-150 RPM.
With the slightest touch of the accelerator, everything is fine.
Even on the slightest inclines, these fluctuations disappear.
When the transmission is cold, the fluctuations are not present for the first 2-3 kilometers.
The problem also exists when using cruise control.

That's why I think it's due to the old gear oil, which might be foaming or completely contaminated.

Upon inquiry with two friendly individuals, a sense of confusion was evident.

Greetings from the city of Halle.

Olaf.

Hello.

I'm familiar with that problem, having experienced it with a VW Beetle with an AFN engine and an automatic transmission.
I pursued many things back then, but I was unsuccessful in all of them.
Ultimately, the problem was caused by a very old air mass sensor (with approximately 230,000 kilometers on it).

After replacing the part with a replacement part from Bosch, the problems were resolved.

Autonomous vehicles heavily rely on the values provided by the mass airflow meter.
The switching behavior is influenced by this, as the values from the mass airflow sensor (MAF) are used for load recognition.
However, it is also very important that the coolant thermostat functions correctly and that the dual temperature sensor provides plausible values across the entire curve.

Regardless, it is generally recommended to change the ATF fluid, replace the suction filter, and verschandeln the transmission oil pan.
You can find instructions for changing the filter and refilling it correctly on the VW Erwin (siehe Fehlerdatenbank) platform.

Regards, Mpire.

Thank you very much, Mpire!

That's very interesting what you're writing about the Lutum mass gauge.
Someone already told me that.
I ruled it out because, with setting N, I can keep the speed absolutely constant in all ranges.

But that's without any load!

It's quite possible that the airflow meter might not function correctly under heavy load.
The error memory is clear, but I think I'm going to renew it.
Maybe he's the culprit.

Greetings.

Olaf.

Hello.

Please do yourself a favor and don't buy cheap, generic parts or anything from discount stores. If Bosch is the original manufacturer, use that part, and the same goes for Pierburg. Everything you try to save in Euros, you'll end up paying for with more problems.

The LMM (likely referring to a mass airflow sensor) doesn't display an error message when it starts to malfunction; it only shows an error if the connector or power supply line is disconnected or has a short circuit.


Regards, Mpire.

Basically, I only buy brand-name products and nothing else.

Only use ATE brakes; I once installed Zimmermann brakes and it was terrible. After 500 km, I started hearing a rubbing noise on the front axle.
Shock absorbers, Sachs brand only.

Thank you!

Greetings.

Olaf.