2.0 TDI CR CFHD: Replace Pressure Sensor

Hello,

I need to replace the pressure sensor on my 2.0 TDI CR engine with the engine code CFHD, which is installed in my Ibiza 6J, because of the following error:

9127 - Wastegate actuator for turbocharger.
P00AF 00 [167] - Stuck.

The error memory shows a fault, the glow plug warning light is flashing on the dashboard, and there is almost no power.
So far, so good. The part number for the replacement part is 03L 198 716 B.
"The installation and removal are mechanically straightforward, but my question is whether the new pressure sensor needs to be calibrated using VCDS, or how should the linkage be adjusted? Is it simply a matter of transferring the old measurements to the new one?"

Regards, invade.

Hello!
I cannot answer that specific question because I haven't done it myself yet.

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

"Note:"
Is the can really defective?
Most of the time, the problem with a turbocharger is a mechanical issue.

Hi.

I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

Let's take a look at how it works on the old loader. Usually, when the container is fully extended, the adjustment lever is right at the stop.

Most of the time, as Steffen already pointed out, the problem is not the vacuum sensor.

Quote:

I need to replace the pressure sensor on my 2.0 TDI CR engine with the engine code: CFHD, which is installed in my Ibiza 6J, because of the following error: 9127 - Adjustment unit for turbocharger. P00AF 00 [167] - Stuck. The error code is stored, the glow plug indicator is flashing on the dashboard, and there is almost no power.

The conclusion you wrote is nonsense. You don't have to do anything, but first, you should figure out what the exact problem is and which part is stuck.

Best regards, Rainer.

The adjustment mechanism works perfectly and is very easy to operate.
Both when the engine is running and when it's idling!

Using VCDS actuator diagnostics, it extends a short distance, but then it seems to lack power. However, if I gently assist it with a screwdriver, it works perfectly. If the turbo adjustment was stuck, I think it would require more force to operate.

What else do you think it could be?
The vacuum hoses are all in good condition!

It's also possible that the vacuum sensor isn't receiving the correct vacuum pressure. Therefore: disconnect the hose and, for example, use a large syringe to create suction and test it.

And: Measure vacuum pressure!

Just disconnected the hose directly from the pressure sensor and created a vacuum using a vacuum pump...

Nothing is happening!
"When the engine is off and/or the hose is connected, if I move the rod up and down with a screwdriver, I hear a whistling sound coming from the container, as if something is leaking."

Just to be on the safe side, a large syringe is still connected.

Suction: No action.
Pressing (blowing): Nothing happens, but you can hear a hissing sound, likely coming from somewhere in the area of the pressure chamber/rod.

Quote:

Just to be on the safe side, a large syringe is still connected. Suction: No action. Pressing (blowing): Nothing happens either, but you can hear a hissing sound, as if the air is escaping somewhere in the area of the pressure chamber/rod.

Okay, then it's likely that it's actually defective. But that's quite rare.

Just ordered the part, the repair kit costs 146 euros.
The parts specialist said that he had ordered the repair kit several times before.
I'm excited; it arrives tomorrow, and then, after work, I'll tackle the challenge.

I'll adjust the rod in the same way as the old one, using the same spacing, and then I'll test it. Is my approach okay?

Yes, a before-and-after log of the boost pressure control (target/actual) would be helpful.

"Response test: Measure the instantaneous boost pressure value when transitioning from zero throttle to full throttle at 3000 rpm in at least 3rd gear. This will reveal whether the tuning is too conservative or too aggressive."

Best regards, Rainer.

Normally, you adjust this using a vacuum pump and VCDS.
The voltage must be 760mV when there is a vacuum pressure of 600 mbar, but I'm not entirely sure about these values.

The new can is installed, and it's working again!
So, it was definitely the vacuum sensor that was defective.

Now I just need to do one more logging run to see if the settings are correct.
Previously, Log couldn't walk normally because he was limping badly.

Thank you for your feedback!

Here's the log in 4th gear, without full throttle.

It drives really well, and the values seem okay to me...

Is that ?

dieselschrauber wrote:

That's correct

So, the values are okay?