2013 Passat TDI DPF Diagnosis for frequent regeneration and ash volume

[KIrwan10]

How do you know ?

You dont yet know what you dont know !!

I know how vehicles work, but I am new to volkswagen specific computer systems. Thats why I am blowing up this feed with questions, because I don't know everything lol

I also compared both the old and new sensors to make sure there wasn't any variation.

Then I hooked up a digital differential gauge to make sure the readings were actually correct.

But this is true, I don't know what I don't know yet. Guess that's the beauty of all of this.

 

[KIrwan10]

How do you know ?

You dont yet know what you dont know !!

If I knew everything I wouldn't be here asking these questions and my car would be fixed lol

 

[Dr Sheldon]

but I am new to volkswagen specific computer systems.

There is nothing specific about VW. It is all Bosch, Continental, Magnet Marreli and the bunch.

They are all the same - No one out there re inventing the Wheel.

Often I look at a system and its design and wonder if the designer had a stroke halfway through designing it !!

Bit like giving birth to a shit kid - You still learn to love it

 

[Dr Sheldon]

but I am new to volkswagen specific computer systems.

Get to ERWIN and download the SSP's relevant to your car and issues.

I think you would enjoy reading them

 

[Uwe]

Difference pressure: 9hPa (if I raise the RPM it climbs to around 14-20 and then does not drop back to 9 when I return it to idle)

That there is your starting Point - That is just plain Wrong !!

I have to agree, that does not sound right.

-Uwe-

 

[SaVAGeSoot]

O hai guyz..... Happy Monday.

My main worry is why my oil ash volume reads 0 when I know that is pretty much impossible with the mileage.

What would you expect it to read after this?

I accidentally pressed "resetting of learned values of particulate filter."

If you've done the following...

I have also been monitoring this vehicle since 50K when I bought it with oil tests at every oil change so you could say I am a little obsessed with making sure it functions properly.

you must have past DPF ash stats form various ODO readings no?

 

[KIrwan10]

I have to agree, that does not sound right.

-Uwe-

Yea it seemed pretty strange to me, unless it's dumping a ton of oil in there with each tap of the pedal (which it is not) Ill dig a little deeper this week and put a vacuum pump on the sensor as was mentioned earlier, and see if it's actually changing as it should, then just go from there.

 

[KIrwan10]

O hai guyz..... Happy Monday.

What would you expect it to read after this?

If you've done the following...

you must have past DPF ash stats form various ODO readings no?

I do not, I haven't had this software for more than the last 2 months or so. I do have my wifes car to compare numbers to but that one is about 70K less miles.

 

[Dr Sheldon]

I do not, I haven't had this software for more than the last 2 months or so.

Regardless !!

-Difference pressure: 9hPa (if I raise the RPM it climbs to around 14-20 and then does not drop back to 9 when I return it to idle)

That is all you need to worry about for now !!

That doing that will cause chaos - The ECU will think DPF is clogged or it will take the pressure reading as implausible. Either way regeneration will be paralysed and you back at square one !! Donald Ducked !!

 

[Uwe]

I do not, I haven't had this software for more than the last 2 months or so. I do have my wifes car to compare numbers to but that one is about 70K less miles.

Post #5 in this thread should have the information needed to adjust your ash value.

-Uwe-

 

[SaVAGeSoot]

Is there an echo in here?

 

[Uwe]

Is there an echo in here?

Some men, you just can't reach.

-Uwe-

 

[SaVAGeSoot]

Some men, you just can't rteach.

There... I fixed that for you

 

[KIrwan10]

Alright here is where I could use some expertise and not smart comments.

There are 2 differential pressure sensors here, one near the fuel filter and coolant globe, and one underneath a heat resistant foil near the rear of the engine.

Each have 2 hoses, one hose connects the two sensors together, is there a factory vent somewhere between the two of these or did I just find a massive leak?

 

[SaVAGeSoot]

Bruh, are there service manuals for that vehicle? Or is this some kind of undocumented home build Passat?

 

[KIrwan10]

Post #5 in this thread should have the information needed to adjust your ash value.`

Bruh, are there service manuals for that vehicle? Or is this some kind of undocumented home build Passat?

Im trying to make sure I can get my 4 year old daughter to her doctors appointments regularly and make it to work without destroying my car. Finally scraped together enough to get this software so if we could refrain from smart ass comments id appreciate it. If you dont know the direct answer hopefully someone else will.

 

[Uwe]

If you dont know the direct answer hopefully someone else will.

What exactly is the question you are seeking an answer to at this point?

-Uwe-

 

[KIrwan10]

What exactly is the question you are seeking an answer to at this point?

-Uwe-

The one hose that links the two differential pressure sensors together, is there some kind of venting in that hose from the factory? Or should it be completely sealed and be able to hold vacuum?

 

[SaVAGeSoot]

The one hose that links the two differential pressure sensors together, is there some kind of venting in that hose from the factory?

Why would there be a "vent" in a line between two pressure sensors?
Do you think pressure would exist in a "vented" line?
One of the pressure sensors should be for your DPF pressure... so follow the lines and it should lead to before and after the filter.
The other, should be just an exhaust pressure sensor... so that one might only have one line going to it, and the other might be open to atmosphere.

 

[KIrwan10]

Why would there be a "vent" in a line between two pressure sensors?
Do you think pressure would exist in a "vented" line?
One of the pressure sensors should be for your DPF pressure... so follow the lines and it should lead to before and after the filter.
The other, should be just an exhaust pressure sensor... so that one might only have one line going to it, and the other might be open to atmosphere.

I did follow both lines, one of them goes to the dpf, the other one goes past the dpf, and links to the exhaust pressure sensor or egr differential sensor. That hose that links the two does not hold vacuum or pressure. When I replaced that hose my hpa values went way down and were more responsive. But end up going into negative values occasionally at idle, even after resetting learned values and adaptation