E350Cdi 2012 C207 - EGR Testing Xentry, DT Monaco or Vediamo?

[MrGundam]

Hi Everyone,

Can anyone point me in right direction of how to test my EGR is working correctly? I am currently trying to pinpoint why my dpf wont regen, despite no EML issues. I am losing power and iCarsoft is showing 29g of soot. iCarsoft only shows 'On/off ratio of exhaust gas recirculation' which is always at 20% no matter what driving conditions. The Actuation of the EGR also doesn't seem to do anything from inside the iCarsoft system, but not sure if this is my actual EGR playing up or the software.

I have a C4 Star scan tool available soon but never used one so going to be a bit of a learning curve.

Do I use Xentry, DT Monaco or Vediamo? Very confusing.

 

[mersum1es]

Xentry. There are guided tests and checks for each fault code, and without code you can select from list of all actuations whatever you want. Also variety of measured (only) parameters available.

Monaco and Vediamo are more for coding change stuff /especially when no account available for SCN codings. They are quite complex stuff for beginners plus you can brick your modules unless you know what you are doing, but later very efeective when enough expreience. I was seriously thinking at one point to get a totaled car for learning platform, but then rejected idea in lack of time and space... so I still can't use either of those programs

 

[M80]

I'm used to see an EGR move in the range 4% to 95 - 100%.
They are known to seize up with the soot. But I would have expected an EML light and fault.

Can you be sure the EGR hasn't been mapped out?
Have you seen evidence that the DPF does regen?

Otherwise I would remove the EGR and check it for free movement.

BTW, start with DAB and run the quick test, after it has taken you through the pages of vehicle recognition.
I would note any fault codes, do a reset, and then after a run do it again. There may be many fault codes in history due to low voltage and such.

 

[MrGundam]

I'm used to see an EGR move in the range 4% to 95 - 100%.
They are known to seize up with the soot. But I would have expected an EML light and fault.

Can you be sure the EGR hasn't been mapped out?
Have you seen evidence that the DPF does regen?

Otherwise I would remove the EGR and check it for free movement.

BTW, start with DAB and run the quick test, after it has taken you through the pages of vehicle recognition.
I would note any fault codes, do a reset, and then after a run do it again. There may be many fault codes in history due to low voltage and such.

Thank you for your reply. Probably easier if I give a bit of history:

Purchased vehicle early 2021 and it had 102000 miles. Fixed a few bits like thermostat and full service. It also has a professional Map since around mid 2021. The tuning company have confirmed that EGR is not touched as part of the tune.

Never had any EML, but when I purchased iCarscan I could see historic codes:

14B700	The control deviation of component Y27/9 (Exhaust gas recirculation actuator) is too high
14CF00	The positive control deviation during exhaust gas recirculation is too high
15FC00	The learned values for component B28/8 DPF (differential pressure sensor) are outside the permissible range

So as a precaution I replaced the DPF sensor with a genuine new part, and never had any issues.

Around July with a mileage of 120000 miles and after 6 weeks of short journeys vs my usual 60 mile a day commute I noticed it felt bogged down and not as responsive. Scan tool showed much higher soot content and last DPF regen as around 114,000 miles. No EML but clearly needed a regen which for some reason has not been happening. Again no EML so only iCarsoft data to go by.

Date	Approx Mileage	Pressure Differential in DPF mbar	Back pressure mbar	Ash gram	Soot gram	Est %	iCar Mileage at last Regen KM	Miles Converted
15/2/2021		17		0	6.43	86%	1517120	94269
16/2/2021				0	0	0%	1517717	94306
26/2/2026		7	1120	0	0.71	9%	1517756	94308
9/3/2021	102000	10	1161	0	1.08	14%	1668215	103657
4/4/2021	104000			0	2.81	37%	1669365	103729
29/6/2021	107089			0	1.59	21%
3/9/2022	118781			0.01	28.21	376%	1838289	114225
3/9/2022	118781			0.01	5.58	74%	1838289	114225
27/11/2022	122341	97	1350	0.01	29.73	396%	1838289	114225
1/12/2022		112	1375	0.01	29.79	397%	1838289	114225

I ended up trying a good thrashing on the 3/9/2022 and that somehow cleared some soot, although not via a regen.

I recently removed the EGR, which wasnt gunked up and gave it a good clean. The valve moves freely, however iCarsoft only ever seems to read it as being 20%. Even when driving in different conditions it never registers as changing so not sure if iCarsoft is just not reading it (not the best software to be honest) or if the actuator part is faulty, and linked to the historic codes mentioned above.

I assume a faulty EGR would prevent a regen, however if so surprised no EML.

I purchased the newer V3 iCarsoft in the hope it now had forced regen, however no such option for my model. It does have ability to actuate components and this works well with all, except when I try with the EGR it shows just the same 20%. Again not sure if its the scan tools limitations of the EGR itself.

I have now purchased C4 so I can do some proper diagnostics and hoping to be able to actuate / test the EGR as well as force a regen.

 

[M80]

Buying Xsentry is a good move,
I find iCarsoft (well my V2) has limitations, and I prefer to confirm the readings otherwise.

You may need to confirm continuity from ECU to EGR when plugged in. I've had flared female connectors prevent that.

Also I've had 2 Star suppliers let me down, one from Ashbourne, Derbyshire, t'other was a Lancashire lad.

I'm not aware soot can be reduced in a DPF. to my mind it is what eventually finishes them. We incinerate the ash, but soot slowly builds.
Anyway see what Star can do for you, it 'may' force a regen.

In DAB you will see opportunity to reset learnt values of many things, and calibration of new components. Don't think any iCarsoft can do all that.

 

[alexanderfoti]

Buying Xsentry is a good move,
I find iCarsoft (well my V2) has limitations, and I prefer to confirm the readings otherwise.

You may need to confirm continuity from ECU to EGR when plugged in. I've had flared female connectors prevent that.

Also I've had 2 Star suppliers let me down, one from Ashbourne, Derbyshire, t'other was a Lancashire lad.

I'm not aware soot can be reduced in a DPF. to my mind it is what eventually finishes them. We incinerate the ash, but soot slowly builds.
Anyway see what Star can do for you, it 'may' force a regen.

In DAB you will see opportunity to reset learnt values of many things, and calibration of new components. Don't think any iCarsoft can do all that.

Other way around.

DPF "burns" Soot which turns into Ash.

Ash builds up until it physically blocks the DPF and it has to be cleaned externally or replaced.

STAR/Xentry will only force a regen on a drive cycle, which can take 40-50 minutes of driving.

I think OP needs to sanity checked that the ecu hasnt had the EGR mapped out (poorly!)

 

[supernoodle]

Can you be sure the EGR hasn't been mapped out?

That was my thought too when OP asked the same on the other forum. That was before any mention the vehicle had been remapped in the past.

OP, a soot load of 29grams doesn't sound excessive. DPFs normally have a max soot load of 8g/litre. Not sure what the volume of the DPF is here, but if it's 4l, that's not even 100%.
Mind you if you have EGR off, you're not going to have not much soot..

The exhaust back pressure looks normal too. If the DPF was blocked that would be higher.

 

[M80]

Other way around.

DPG "burns" Soot which turns into Ash.

Eeh aw,
Aye the returns from a crematorium aren't soot.

 

[MrGundam]

So finally got around to testing with Xentry which I have now purchased.

EGR
Like iCarsoft, Xentry is also showing my EGR as not responding when attempting to actuate manually despite not kicking up any errors. It only reads as 4% and actuating it manually within Xentry doesn't change the readings or engine RPM. I have already checked it isn't clogged and moves freely.

Testing actuation in Xentry:

So can only assume it is the EGR motor or the position sensor. I have a 2nd hand replacement on the way to at least try and see it that helps whilst I try to source a new Mercedes part (A6421402160 - no longer available from Mercedes).

DPF
Xentry shows the DPF soot content inline with what iCarsoft showed, but with different acceptable values:

I attempted a forced regen through Xentry but it always failed with the below message:

Unfortunately it doesn't seem to provide any additional information as to why it has failed which seems a bit counter intuitive for a pro diagnostic software. Is there somewhere else in Xentry I should be looking for this information as to why the regen fails?

Bit of a head scratcher as I am not getting any EML, just no DPF regen for a long time and am feeling it has a lack of power. Any pointers much appreciated.

 

[mersum1es]

EGR fault may prevent that... not sure though... when it says your last succesfull regen has happened? 150% is level when it should try is at its own.

edit; oh there was no fault code about EGR??? It should give that when its not working... sure its not remapped (fault codes prevented)?

 

[MrGundam]

EGR fault may prevent that... not sure though... when it says your last succesfull regen has happened? 150% is level when it should try is at its own.

edit; oh there was no fault code about EGR??? It should give that when its not working... sure its not remapped (fault codes prevented)?

I contacted the company who performed my current map and they say the map doesn't effect the EGR. It has also performed regens since the map which was back in Feb 2021.


Not sure if there is a way to see if a paste owner has had the EGR mapped out? You would think they would have had DPF removed at same time but who knows.

I wish there was a way to see what fault caused the regen to stop.

 

[mersum1es]

EGR should work by direct control even mapped out AFAIK rempping just change condition map that it never ask EGR to open...

I was asking mapping because some poor maps are disabling faults and EML as a walk around their incapability to build a tuning which would not trigger them

 

[alexanderfoti]

As above. 2 things!

Whilst its pro level diagnostics it is not a "plug in and tell you what to do machine", despite what some people think. It still relies on the fleshy squishy bit to do the actual thinking.

and

You cannot regen the DPF with an active EGR fault.

 

[ajlsl600]

It's a b. Can't find egr fault. Can't sort regen I am very cynical as to why it's one of my biggest probs, was, I just resigned to many f jihadists banging off around the place, I have many diag systems n my biggest prob is trying to remember the foilbles or each. As I might not need to use one for maybe six months. Then there's issue I must f relearn system again. Not any more t f.

 

[MrGundam]

It's a b. Can't find egr fault. Can't sort regen I am very cynical as to why it's one of my biggest probs, was, I just resigned to many f jihadists banging off around the place, I have many diag systems n my biggest prob is trying to remember the foilbles or each. As I might not need to use one for maybe six months. Then there's issue I must f relearn system again. Not any more t f.

? Sorry I have absolutely no idea what you said.

Just to clarify, I have no faults and no EML at all. I just notice I am not getting regen for a long time and soot level is above the acceptable values.

The forced regen is failing but giving no reason why.

What I have noticed is that I cannot actuate the egr and wondering if this is the cause of failed regens. Guess work as the xentry software, for some reason, fails to report reasons for a failed forced regen.

 

[alexanderfoti]

Does the egr show actuation in actual values at idle when warmed up? (not in the egr actuation screen)

Other reasons for fast filling dpf:

Dodgy dpf sensor
Boost leak
Bad injectors
Injectors won't long a fault.

 

[MrGundam]

Does the egr show actuation in actual values at idle when warmed up? (not in the egr actuation screen)

Other reasons for fast filling dpf:

Dodgy dpf sensor
Boost leak
Bad injectors
Injectors won't long a

Does the egr show actuation in actual values at idle when warmed up? (not in the egr actuation screen)

Other reasons for fast filling dpf:

Dodgy dpf sensor
Boost leak
Bad injectors
Injectors won't long a fault.

The EGR values have never changed when viewing them in values menu.

DPF sensor, I replaced with merc genuine part last week and no change.

Injectors - is there a way to test them in xentry? If not what's the best method to test? #

Thanks

 

[alexanderfoti]

You need to reset the adaption values for the DPF sensor, but did you verify any of the readings or was it just replaced as a try?

 

[alexanderfoti]

Smooth running values can help you point to an injector built ultimately will have to do some mechanic ING to check them.

 

[MrGundam]

Smooth running values can help you point to an injector built ultimately will have to do some mechanic ING to check them.

I reset the values when replacing dpf sensor. I replaced it as out of the 3 historic error codes I found (see first post), the sensor was mentioned in one so I thought a good starting point.

Will viewing injection quantities give any indication as to whether injectors are OK?

I guess all I can do is replace egr and go from there as its the only thing I have some evidence for not working correctly.

Still very suprised xentry would fail a process and give no indication as to why.