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 Post subject: DPF info
PostPosted: Thu Oct 11, 2018 9:33 pm 
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Newbie

Joined: Wed Aug 17, 2016 8:47 pm
Posts: 8
Car:: Xtrail
Model: 2.0 dCi Expedition Sport
Year/Plate: 2007
Colour: Blue
I've got a dpf light & trying to get info on how to fix it.
I've driven 25 miles at over 3000 RPM & sat stationary for 20 mins at over 4000 RPM
Light still on
I understand the idea is get the dpf at a high temperature to burn off the carbon
Gone through a lot of the posts, but a lot of stuff seems to be opinions rather than facts.
Trying to find out what's important during dpf regeneration: -
1.) Does road speed matter? My feeling is that engine RPM to bring dpf to high temp is what matters
2.) Can I just park somewhere that's not annoying to anybody & just rev till the light goes out?


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 Post subject: Re: DPF info
PostPosted: Thu Oct 11, 2018 11:27 pm 
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Soft Roader

Joined: Sun Jul 09, 2017 12:07 am
Posts: 20
The service manual states:

When DPF warning light lights up, drive the vehicle under any of the
following condition to complete regeneration.
• The vehicle is driven continuously at 60km/h for 30 minutes*
• The vehicle is driven continuously 15km or more without being
caught in traffic jam
If the vehicle is driven in the driving pattern in which the exhaust gas
temperature can not be raised after DPF warning light lights up,
ECM performs the following to protect DPF.
• ECM enters fail-safe mode and limits engine speed to 3,000 rpm with fuel cut.
• ECM stores DTC P2002 in the memory.


I have found doing 50mph in 5th down the motorway works.

Nick.

Sent from my SM-G920F using Tapatalk


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 Post subject: Re: DPF info
PostPosted: Fri Oct 12, 2018 8:48 am 
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Off Roader

Joined: Thu Nov 30, 2017 7:00 pm
Posts: 163
What does the * mean after '30 minutes' ? It may be significant.

Sent from my XT1032 using Tapatalk


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 Post subject: Re: DPF info
PostPosted: Fri Oct 12, 2018 1:11 pm 
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Xtrail Nut

Joined: Mon Dec 27, 2010 6:11 pm
Posts: 2837
Location: Cumbria
Car:: Xtrail
Model: T30
Year/Plate: 56
Colour: Silver
I have no specific experience of T31, but have worked on this on various VAG and PSA cars.

All internal combustions engines get hotter the harder you work them. However, diesel engines also produce more soot, the harder you work them. Getting exhaust temperature high is key to burning off the soot accumulation in the DPF. If you have an open fire at home, you'll often see that the back of the hearth, closest to the hottest part of the fire, is relatively free of soot - just clean firebrick, whereas the parts of the hearth that aren't as hot, have a significant soot accumulation on them. Whilst working the engine hard is good for getting the exhaust temperature up, it is also bad for generating more soot - the very thing you're trying to get rid of!

The trick, therefore, is to get the engine working JUST hard enough to get the exhaust hot enough, but not so hard that it generates soot. For most engines, that is surprisingly LITTLE work! People who tell you to "thrash it" down the motorway are likely to be simply adding to the problem. In the above recommendation, 60 km/h is only about 40 MPH. The important thing is NOT TO STOP AND LET THE ENGINE IDLE during that time, because it only takes a minute or so for the exhaust to cool down and spoil the regeneration.

Most cars will have engine management strategies that try to increase exhaust temperature when doing a regeneration. They'll fiddle about with EGR settings - possibly injector timing and duration too. They'll do "whatever it takes" to get the exhaust stinking hot for that period. Running the engine at high revs under no load probably won't help much unless it has been put into a "forced regen" mode, where the engine management system can then "do its thing", but driving it under light engine load is better.

Of course, if there is something wrong with your car and some part isn't working so as to allow the thing to go into regen mode, then you might be doomed in your attempts to get it to regen.


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 Post subject: Re: DPF info
PostPosted: Fri Oct 12, 2018 2:01 pm 
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Off Roader
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Joined: Fri Aug 03, 2018 7:28 pm
Posts: 103
Location: S.W. Northumberland
Car:: Xtrail
Model: T31 Aventura Explorer Auto
Year/Plate: 2008
Colour: Thundercloud
Mods: Tow bar with 13 pin plug. LED front sidelights and interior lights.
My experience is very recent and has a happy ending...

The light came on a couple of days ago and I fretted a bit that night whilst researching remedy and reading what is in the manual.

Next day I took her out onto the A69 and kept the revs at 2000-2500 on cruise control and within about 10 Miles ( so about 10 minutes) the light went out. No need for thrashing the engine nor getting her super-hot, just steady and that worked fine.

So I agree with Avocet's more in depth technical description of what is required.

Good luck, I hope yours is as easy...

K ;-)


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 Post subject: Re: DPF info
PostPosted: Mon Oct 15, 2018 9:01 pm 
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Newbie

Joined: Wed Aug 17, 2016 8:47 pm
Posts: 8
Car:: Xtrail
Model: 2.0 dCi Expedition Sport
Year/Plate: 2007
Colour: Blue
I've had 4 long runs with no results at clearing dpf light. I have elm32 blue tooth OBD connector & various Android apps, but none show DPF temp & pressure data. I would like to see evidence that DPF regeneration temperatures are being achieved. Has anyone managed to get apps that show x-trail dpf data?


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 Post subject: Re: DPF info
PostPosted: Sat Oct 27, 2018 8:29 am 
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Soft Roader

Joined: Sun Jul 09, 2017 12:07 am
Posts: 20
scannyman wrote:
What does the * mean after '30 minutes' ? It may be significant.

Sent from my XT1032 using Tapatalk
*: Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws when driving.

Sent from my SM-G920F using Tapatalk


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 Post subject: Re: DPF info
PostPosted: Sat Oct 27, 2018 12:25 pm 
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Xtrail Nut
User avatar

Joined: Mon Apr 02, 2012 2:09 pm
Posts: 2813
Location: Estonia
Car:: Xtrail
Model: T31 2.0dci auto, LE
Year/Plate: 2012
Colour: Grey
Mods: Towbar, ptc heater fix, probright drl system, Eberspächer aux FBH with GSM remote.
the X-431 app does have it, but it requires it's own BT adapter.
When the cleaning process is started, then the x-trail injects fuel at the exhaust stroke. Hot exhaust gasses and little unburnt fuel ignites and burns even hotter in the catalytic converter.
My theory is that the shoot appears when the engine temp and engine revs are low. Heat comes from fuel, fuel comes when the acc pedal is pushed.
When i did my engine rebuild on my T30 and after that a Cyl head replacement and valve regringing, the exhaust valves where clean. So shoot and carbon appears after combustion chamber where the temps are coming down.

EE has a great video
https://www.youtube.com/watch?v=5C9Ie4BcYew

_________________
Sorry for my bad english.


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 Post subject: Re: DPF info
PostPosted: Thu Nov 01, 2018 6:36 pm 
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Extreme Off Roader
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Joined: Wed Sep 30, 2015 1:03 pm
Posts: 472
Location: Portsmouth
Car:: X-trail
Model: 2005 2.2DCi FatFace
Year/Plate: 2005
Colour: Black
Mods: Celtic Tuning Remap to 170HP, EGR deleted, Rear exhaust box removed, K&N air filter, inter-cooler mods
If your egr valve is not shutting fully (it should as the ECU shuts it down to be able to regen), then there is no enough oxygen to burn the soot out. The cleaning map will then just make it worse.


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 Post subject: Re: DPF info
PostPosted: Mon Dec 03, 2018 6:13 pm 
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Newbie

Joined: Tue Apr 07, 2015 5:18 pm
Posts: 15
Car:: Xtrail
Model: Aventura 2.0 DCI Manual - 150
Year/Plate: 2009
Colour: Thundercloud
Mods: None
I've had my Xtrail for about 3 years now and the light comes on periodically. Sometimes it takes a few miles of high ish rpm driving to clear it other times I'm going for 45 mins. The other day it came on when leaving work and after getting the engine up to temperature I ended up sitting in a traffic jam for 5 mins moving slowly in 1st and second gear and that cleared it. Another time I was waiting at the side of the road (idling) waiting for a gap so I could get a clear run on the road I normally use and that cleared it!

My normal method is a clear run in 4th at 50-55 mph in cruise control and it usually takes 7-10 miles to clear.


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