Engine codes and DPF.

[steve@helixcabinetmakers.]

I have 2017 CXHA 150 engine which has fault code P226D damaged or missing.
Haven't removed to inspect DPF but my exhaust is very sooty.
I was driving home one evening and the van was in regen mode.
Went round a roundabout and exited flat out in 3rd gear. Seconds later, almighty bang and we filled the road with black smoke.
No engine lights, smoke cleared and i carried on home. Checked for fault codes and we have P226D.
What do we think, am i on the right path.
Found one with part number 7E0254201QX.
Google search shows this for the CXG.
Does anyone know if the DPF on the CX range of engines in the T6 is the same from
2016-2019.

 

[Deaky]

More info here

Carista code P226D

Hi, just wondered if anyone can shed any light on this code that has appeared on Carista? Engine light came on so ran a quick check and this one came up. Many thanks, Cliff

www.t6forum.com

 

[steve@helixcabinetmakers.]

Thank you.
My van still goes into regen mode with the code logged as it takes about 500 miles before the dash light comes on.

 

[mmi]

part number 7E0254201QX

That's a catalytic converter for 4Motion.

Diesel particulate filter is part number 7E0254700PX - anyways please verify the part number at dealer against your VIN - or under the van

 

[steve@helixcabinetmakers.]

Interesting, On the one i have found it has 7E0 131 690 P 2022.
My unit has 7E0 131 690 N 2017.

 

[mmi]

Looks like those codes are part manufacturer's codes? Unfortunately I can't pair those with VW part numbers.

 

[steve@helixcabinetmakers.]

Thanks for taking the time to check.

 

[steve@helixcabinetmakers.]

just a thought, ignoring 4 motion and twin turbo, is it the same part number on the engines, would i be correct in saying there were to other output options.

 

[mmi]

The DPF is the same - on EU6 (AdBlue) engines - at least in MY17-MY18.

 

[steve@helixcabinetmakers.]

Every days a school day,
I have attached a picture of the part they reference to as 7E0254201QX.
I thought this was a DPF.As you correctly say, Volkswagen call this a catalytic converter.
What am i looking at as i am only a wood butcher and my previous van was a 2004 174.

 

[Florin33]

I have a similar problem with my T6 2018 ad blue P226D00 I don't know what to do

 

[steve@helixcabinetmakers.]

With mine the DPF pressure sensor wasn't working, this has been changed and calibrated.
So at the moment i have no codes.
What i thought was the DPF is actually the catalytic convert as explained my mmi.
Will probable removed the DPF in the next few weeks and get it cleaned.

 

[Florin33]

With mine the DPF pressure sensor wasn't working, this has been changed and calibrated.
So at the moment i have no codes.
What i thought was the DPF is actually the catalytic convert as explained my mmi.
Will probable removed the DPF in the next few weeks and get it cleaned.

How you calibrate a presure sensor

 

[nazarko1984]

Hi Guys,

I have a similar issue with my T6 4Motion 2.0 BTDI CXEB MY2018.
I bought it 4 weeks ago with 135kkm on the clock and issues comes up

Have scan it with VCDS and have such a codes:

32110 - Diesel Particulate Filter (Bank 1)
          P226D 00 [039] - Damaged or Subrate Missing
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 138578 km
                    Date: 2023.03.17
                    Time: 17:48:03

                    Engine RPM: 828.75 /min
                    Normed load value: 30.6 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 89 °C
                    Intake air temperature: 21 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 13.140 V
                    Unlearning counter according OBD: 40
                    Particle sensor: time in op. mode measurement: 0.0 s
                    Particle sensor: measuring current calculated: 0.0 µA
                    Particle sensor: cleaning deviation reaction time: 1.000
                    Particle sensor: exhaust temperature: 14.7 °C
                    Particulate sensor: status condition automation: 4
                    Particulate sensor: status condition automation: Regeneration following soot particles plausibility check

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [039] - Efficiency too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 138566 km
                    Date: 2023.03.17
                    Time: 17:32:52

                    Engine RPM: 1486.75 /min
                    Normed load value: 98.0 %
                    Vehicle speed: 82 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 12 °C
                    Ambient air pressure: 1000 mbar
                    Voltage terminal 30: 13.140 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 176.4 kg/h
                    Outside temperature sensor 1: B1: raw value: 9.0 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 997.5 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 42.55 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 187 ppm
                    Reducing agent quality sensor: urea concentration: 35.00 %

I made some troubleshooting and extra readings and here are results:

IDE00558   Voltage of oxygen sensor bank 1 sensor 1 (broadband sensor) 0.210 Lambda / 1.884 V
  IDE04090   Exhaust temperature bank 1 S1/S2/S3/S4:  / 180/157/164/140 °C
  IDE04098   NOx-sensor NOx11:61 ppm / NOx21:--- 
  IDE07716   Particulate filter input: temp. sensor 1: bank 1: raw value 163.2 °C
  IDE07718   Particulate filter output: temp. sensor 1: bank 1: raw value 139.5 °C
  IDE07738   Charge air cooler inlet: pressure sensor 1 bank 1: raw value 1012 mbar
  IDE07745   Particl.filt.: different.press.sensor 1 bank 1: adaptat. value 0.3 mbar
  IDE07748   Particl.filt.: differential pressur.sensor 1 bank 1: dyn.offset 0.6 mbar
  IDE07757   Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value 29.50 %
  IDE09017   NOx sens.dwnstrm.SCR cat conv: NOx conc. 62 ppm
  IDE10817   Lambda value at inlet of particulate filter 3.361
  IDE11219   Reducing agent inj. quantity: spec. value 1 mg/s
  IDE09013   NOx sensor after SCR cat conv: O2 concen. 0.2930
  IDE09017   NOx sens.dwnstrm.SCR cat conv: NOx conc. 64 ppm
  IDE09020   NOx sensor before SCR cat conv: O2 concen. 0.0000
  IDE10817   Lambda value at inlet of particulate filter 3.361
  IDE00434   Particle filter: soot mass calculated 22.01 g
  IDE00435   Particle filter: soot mass measured -9.99 g

What is most strange for me is - IDE00435 Particle filter: soot mass measured -9.99 g, why here is this value?
Also this reading - IDE09020 NOx sensor before SCR cat conv: O2 concen. 0.0000
Is it possible that I don't have a sensor before SCR?

Additionally I have notice that my injection correction is pretty high on first cylinder -18us. This possible can also cause some issue with DPF. When I stay for about 10 min and press acceleration, I have nice white cloud after my Van

Any suggestions? Thank you in advance for help.

 

[mmi]

32110 - Diesel Particulate Filter (Bank 1) P226D 00 [039] - Damaged or Subrate Missing

How does the exhaust tailpipe look - is it sooty? Wipe with a clean cloth - please post a picture.

T6 4Motion 2.0 BTDI CXEB MY2018.

Please post full VCDS Auto-Scan - there are (at least) 10 different engine softwares on T6 with the spec above. The Auto-Scan helps to determine the exact software.

What is most strange for me is - IDE00435 Particle filter: soot mass measured -9.99 g, why here is this value?

I guess, you mean why negative value? I guess it's just scaling/offset (thus diagnostics tool's interpretation) as on some engines it's always shown as a positive number.

Also this reading - IDE09020 NOx sensor before SCR cat conv: O2 concen. 0.0000
Is it possible that I don't have a sensor before SCR?

Most likely correct statement for MY18 CXEB engine.

Additionally I have notice that my injection correction is pretty high on first cylinder -18us.

I believe more data about circumstances are needed - the correction values are actully dynamic depending on engine load etc. etc. See below a snippet of a log of an engine with less than 20.000 miles.

CXFA	Recording over 2 hours 24 minutes (114 measurements)	MIN	MAX	AVERAGE
IDE12085	Fuel injection time deviation: cylinder 1	-12	6	-0.175	us
IDE12086	Fuel injection time deviation: cylinder 2	-20	18	-0.018	us
IDE12087	Fuel injection time deviation: cylinder 3	-2	22	0.632	us
IDE12088	Fuel injection time deviation: cylinder 4	-27	3	-0.746	us

Not Confirmed - Tested Since Memory Clear Freeze Frame Fault Status: 00000001 Fault Priority: 2 Fault Frequency: 1

Please post a full engine blockmap data - it possibly sheds some light about engine's history. Preferably engine idling - after minimum of 20 minutes drive - thus everything warmed up.

VCDS > Applications > Controller Channel Map >


NOTE: Works only with VCDS HEX-V2 and HEX-NET interfaces.

Tick the boxes as above and click Go
VCDS flashes scrrens for a moment. When finished click Done.
There will be file(s) blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\...

Even better would be if you could make 3-4 sets of data. Just click Go to make another set. Each set takes about 70 seconds.

 

[Dellmassive]

my first though was the DFP has been smashed out in a straight through exhaust.

DPF delete?

so the ECU is not detecting any pressure difference?

 

[nazarko1984]

Hi MMI and Dellmassive,

Thank you very much for quick reply.

Van was serviced in VW garage. I have the service history up to 131 kkm, I bought it from second owner who did only 4kkm. I don't thing they did anything with DPF. They have refurbish both turbines and that's all what they done with Van plus small oil service.

Previously nad even today I had a soot burning in DPF. Engine speed growth. Process took about 20 min. I couldn't record that with VCDS. Process finished just before I have connect PC.

@mmi
Regarding your questions. Exhaust is sooty. This is first thing what I noticed after DPF error code appeared.

I guess, you mean why negative value? I guess it's just scaling/offset (thus diagnostics tool's interpretation) as on some engines it's always shown as a positive number.

Negative value plus this value has never changed. Is always the same -9.99g

I have latest firmware version for this ECU - 6207. I assume this version shall read the value correctly.

Here you have all read outs as requested.

My correction so more visible on first cylinder. Plus I have notice that around the injector is wet. So maybe washer is broken and need to be replaced. Before I do anything I need to buy a set (washes and bolt) for 2 injectors.

 IDE12085   Fuel injection time deviation: cylinder 1 -18 µs
  IDE12086   Fuel injection time deviation: cylinder 2 13 µs
  IDE12087   Fuel injection time deviation: cylinder 3 2 µs
  IDE12088   Fuel injection time deviation: cylinder 4 0 µs

 

[Dellmassive]

@mmi

worth graphing some data PIDS?

 

[mmi]

@mmi
Regarding your questions. Exhaust is sooty. This is first thing what I noticed after DPF error code appeared.

That's not good news. Also the following data (from the two .CSV-files) indicate excessive/non-filtered flow-through.


Engine idling I'd expect the pressure difference across the DPF to be around 7-10 mbar.

Previously nad even today I had a soot burning in DPF. Engine speed growth. Process took about 20 min. I couldn't record that with VCDS. Process finished just before I have connect PC.

Hmmm... that's interesting. The data suggests the DPF regeneration did not finish yet - all the counters below should clear/zeroize when finished.

I don't thing they did anything with DPF.

Well, at some point DPF ash accumulation value has been adapted.

4.33 grams suggests the value was set to zero approx. 12.000 km ago (7.500 miles).
Mine has 28.2 grams at 80.000 km.

Is it possible the DPF has been replaced with a non-genuine DPF? The OEM DPF should last approx. 300.000 km though.

 

[Dellmassive]

got a few pics of the exhaust tail pipe?

a finger rub of the soot?

any pics of the underneath, exhaust, back boxes, CAT, DPF?