ZF 5HP19 automatic transmission problems in the VW Passat 3BG

Hello, I'm having the following problem with my Passat (see my profile).

When shifting from 2nd to 3rd gear, the transmission occasionally loses all power, the engine revs up like it's in neutral, and then after about 1 second, it engages the gear. After that, everything is fine for a few days until it happens again.

The oil and filter were changed 5000 km ago, and I just checked the oil level, and it's correct!




I just performed an actuator diagnosis, and you can clearly hear the solenoid valves clicking as they open and close.

The solenoid valves all report a "short circuit after positive" error, which seems logical when they are energized (or does it?).
"Only one has a short circuit after the mass airflow sensor (MAF) and pressure control valve N218, which could be the problem?"
The pressure regulating valve 4 is also known as N94!
N94 is responsible for the WÜK.
The water pump is not shutting off, and the engine is revving up like it's idling?

I found the following online:
[Dead link]

What do our experts say about it?

However, the transmission control unit's fault memory is empty. Why is that?


[Dead link]

I was already informed in another forum that the short-circuit indication after the positive terminal in the actuator diagnosis is not correct. Could this be a bug in the older VAGCOM versions?
I also posted this question in the Passat 3B forum, but I hope to find some Audi and BMW drivers with the same type of transmission here as well...

Hoping for help.


Thank you very much, Sven.

Hi,

Please describe how you checked the ATF (Automatic Transmission Fluid) level.

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

"Micha"

Hello,

Oil temperature approximately 35°C, engine running, selector lever in Park (P), overflow drain (17mm Allen key) open, slight oil leakage = everything is fine with the oil level.

The oil was changed by me 5,000 km ago, using the correct original VW ATF G 052 162 A2.

"For the last 5000 km, it ran like a Swiss watch, but now it's acting up occasionally, the last time being on Saturday when the transmission was lukewarm."

I'm currently turning, I've gone around the bend, and I'm accelerating sensibly in second gear. I want to shift into third gear... The engine sputters like it's idling... I instinctively take my foot off the gas, and suddenly it's in third gear, and then it runs normally like nothing happened.
The shifting from 2 to 3 is also working well.


I've now run the actuator diagnostic test again using a VW tester, and everything is fine; no valve has a short circuit.
It seems like Vagcom is malfunctioning.




Sven.

Hi,

I'm not understanding how the converter bridge is related to the jerking when shifting gears. If the waste heat recovery system isn't working, you might only notice it through a slightly higher fuel consumption and somewhat higher engine speeds when driving at a constant speed.

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

"Micha"

... the clutch engagement obviously has nothing to do with the jerking when shifting gears; you misunderstood that, or I didn't explain it clearly.
I now also know that the "high-revving" between gears has nothing to do with the waste heat utilization system, but rather with the other clutches controlled by magnetic valves.

When shifting gears, the power is transferred smoothly as one clutch disengages and the other engages.

I'll take a look at the slide gate on Friday.


Sven.

Are you sure that the information the GSG receives from the MSG is always accurate and correct?
Or could it be an error caused by a faulty input signal from the engine, which in turn might originate from a false signal from the engine itself (e.g., if the mass airflow sensor malfunctions temporarily, the transmission might also malfunction, or even break down – a prime example are the A6 emergency vehicles, mostly 2.5 TDI models with automatic transmissions).

Hello, no, of course I'm not sure about that, how could I be?
The error occurs very sporadically. When the mass airflow sensor malfunctions, you don't necessarily notice it at that moment because there's no forward motion anyway, or it's not being engaged at that particular moment.

I think we can only wait and see how often it happens.

What is RTW? Ambulance?


Sven.

Okay, here's the translation:

'Jip... Rescue Transport Vehicle'

What kind of defects are there in the automated systems of the A6 ambulances?
Starting with a faulty mass airflow sensor?

Quote:

EDIT 1: Today, I removed the oil pan from the transmission again. There's no wear or debris, and if you look closely, you can even see some of the yellow color from the fresh oil. Wait... Sven

Quote:

EDIT 2 For a while, the engine/transmission didn't rev up like it would in neutral, but there were occasional slight fluctuations in the RPM, although there was no slipping of the clutches. I've decided to try the G62 theme, even though I'm not entirely sure if it's what I need. Replaced the sensor, following a tip from @vagtuning. The sensor might be reporting that the engine is cold, while the engine control unit (ECU) is enriching the fuel mixture because it thinks the engine is warm, leading to fluctuations in engine speed. These fluctuations usually resolve within seconds, but if this happens during a gear shift, it could potentially cause the engine to rev up. Just speculations, I'll wait and see now. VW has modified the G62; the old housing is black, while the new one is green. Sven

Quote:

EDIT 3: 06/02/2007 Hello, since replacing the G62, everything has been quiet so far. So far, no further abnormalities have been observed. I hope that's all... Sven