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  #709  
Old 02-02-2015, 06:27 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Steve1307 View Post
See my post #678 a page or so back for the l-o-n-g explanation.
Hmmm, ok. I'm super busy these days, but I'm tempted to set this up since you've provided the info......

....entered it as a custom in my app like this:
Name: DPF % full
Mode: 01
PID: 8B
min: 0
max: 100
units : %
Equation: C*100/255.

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  #710  
Old 02-02-2015, 09:05 PM
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Re: Is DPF issue for 2014 CRD fixed now?

I had a regen occur on the way to work this morning.

My DPF was at when I left home 66% and as soon as I got onto the freeway I noticed my instant consumption was sitting at 9L with cruise set to 100km/h. The CAT Temp went up to ~650 deg. C and this lasted for about 15km until I hit traffic congestion and had to slow down to a crawl. Not long after the CAT Temp started to drop to the normal ~200 deg C and the DPF dropped down to 8% full. I think if I did not hit traffic the regen would have keep going till the DPF was completely empty.

Couple of issues with my logging is that the instant consumption PID that I am logging did not show the increase in instant consumption that I saw on the dash. Also the custom regen status PID that I am monitoring did not change value, but this could be me not configuring the PID correctly.
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  #711  
Old 02-02-2015, 09:41 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Benn0 View Post
Hmmm, ok. I'm super busy these days, but I'm tempted to set this up since you've provided the info......

....entered it as a custom in my app like this:
Name: DPF % full
Mode: 01
PID: 8B
min: 0
max: 100
units : %
Equation: C*100/255.
Yep, thats it.
The max of 100 i guessed was the output value max.
The value of Byte "C" is 0 - 255 decimal, so we scale it 0-100.


Sorry to bore everyone with technical stuff but there's more relating to these DPF parameters.

I also did poll the ECU PID 8B byte "A" to see which functions are supported.
it came back as "115" decimal which is 1110011 binary meaning......

regen status = 1, supported
active/passive indication = 1 , supported
NOx adsorber = 0, not supprted
Desulfuriztiaon = 0, not supprted
Normalised DPF% load = 1, supported.
AVG time between active regens = 1, supported.
AVG distance between active regens = 1, supported.

These last 2 might need to have a few active regens under the belt before they'll give any meaningful data.
This is what it says about them.

Quote:
Originally Posted by SAE J1979 editted
Average Time Between DPF Regens
Bytes: D,E Min : 0 min Max: 65535 min , 1 min per count, DPF_REGEN_AVGT xxxxx min
DPF_REGEN_AVGT shall indicate the EWMA filtered time between successful, active triggered DPF regens. The weighting factor shall be chosen to produce a representative value after 6 regen cycles (~0.5)

Average Distance Between DPF Regens
Bytes: F,G Min: 0 km Max :65535 km, 1 km per count DPF_REGEN_AVGD: xxxxx km (xxxxx miles)
DPF_REGEN_AVGD shall indicate the EWMA filtered distance between successful, active triggered DPF regens. The weighting factor shall be chosen to produce a representative value after 6 regen cycles (~0.5)
I haven't tried these yet but the equations to enter would most likely be worked out like similar OBD values with 0 - 65535 scaling

Average Time between regen
Mode: 01
PID : 8B
min: 0
max: 65535
units: minutes
Equation: (D*256)+E

Average Distance between regen
Mode: 01
PID : 8B
min: 0
max: 65535
units: km
Equation: (F*256)+G

Again these are just displays of some values that have been calculated some where else in the ECU.
The ECU indicates it supports these values
I haven't tested these yet, maybe they wont give anything sensible, and maybe they will be zero until a suitable number regens have occurred.
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  #712  
Old 02-03-2015, 07:28 AM
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Re: Is DPF issue for 2014 CRD fixed now?

For those with recurring DPF or other issues.... A good read and the reason I didn't fork out $1000's for an extended warranty. Worth a read.
http://www.accc.gov.au/system/files/...umer%20Law.pdf



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Old 02-03-2015, 04:19 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Thanks for posting the ACCC link Twscoot. A good reminder for us all that there ARE protections for consumers. Most big businesses operate on the "deny everything policy" as they know that most consumers either don't know their rights or won't pursue them.
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  #714  
Old 02-03-2015, 06:09 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Twscoot View Post
For those with recurring DPF or other issues.... A good read and the reason I didn't fork out $1000's for an extended warranty. Worth a read.
http://www.accc.gov.au/system/files/...umer%20Law.pdf



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Great post, I have been looking for this PDF for a while.
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  #715  
Old 02-03-2015, 07:04 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by GMWK2 View Post
Thanks for posting the ACCC link Twscoot. A good reminder for us all that there ARE protections for consumers. Most big businesses operate on the "deny everything policy" as they know that most consumers either don't know their rights or won't pursue them.

If all that reading is a bit dry..... then we could watch it on the ABC "Checkout" show instead

ACCC returning goods / Consumer law / Acceptable quality / Major Failure




Service & Major Failure



Extended Warranties



...or if you've had enough of the issues with Diesel then maybe it's time to go all Electric.

There's plenty of Torque in this baby, it pulls like a train. (literally)
THE SYDNEY MONORAIL IS FOR SALE | Miscellaneous Goods | Gumtree Australia Marrickville Area - Sydenham | 1057530862
......oh wait ?
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  #716  
Old 02-04-2015, 05:18 AM
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Re: Is DPF issue for 2014 CRD fixed now?

DPF monitoring update

I've been driving on a lot of short trips recently, and the DPF was filling up quite rapidly. Oddly the %full I'm reading has been ocasionally stepping up and down by as much as 15% for little apparent reason.

It would be at 60% and then drop down to 45% and then some time later gradually come up to 60% again. Perhaps it's from the inherently hard to measure differential pressure sensor.
The overall trend is gradually filling with slow driving around with cold starts and in traffic. It has taken about 10days with many short trips (and one longer twisty 50km drive)

I have not done any driving on the highway in the last couple of days (since the 50k test on Monday) and finally it decided to to do a regen at just over 70% and just seconds before pulling into my driveway , how convenient

There was no message on the EVIC display. The loading did not reach the 80% value mentioned in the Diesel manual supplement (USA version)


Unfortunately, I couldn't turn around and go back out again, I just let it run and took a couple of screen shots, whilst unloading all the frozen food, meat etc.

The Regen sequence does abort after about 2-3 minutes of idling time.

Had I not been monitoring the temps I would not have had a clue the regen was happening at all.




1. Idling at traffic lights, several minutes before whilst 67% fuel 0.7 L/h

2. Idling in driveway after start of regen the CAT temp climbs 530 and the fuel rate is 2.1 L/h. The EGT sensor (near the turbo) is a little higher but the Coolant temp is unaffected.

3. Idling in driveway and temp is still high, the fuel injected seem to be controlled to keep the CAT temp 550 - 620 ish. Fuel hovered around 2.1-2.2 L/h.
Not really much of a smell but could hear the cooling fan going.

4. Regen aborted and the temps went back down to normal for idling condition and fuel flow back down. Coolant temp the same.
As you can see the %DPF loading is only burnt off a little bit.


Also, note that my "Regen indicator status" value does not work and stayed at "0" throughout. (as also observed by XtRmn8)


Now it looks like I'll have to go for a proper drive in the next couple of days to clear it out properly.

It had worked fully a couple of weeks ago, so I would expect it to do the same again.


I'm glad that the sequence appears to work as it is intended.
Gives me more confidence in the emissions systems now.
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  #717  
Old 02-04-2015, 07:48 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Good info Steve.

My CAT Temps maxed out at about 650 deg C. I'll throw up a graph of the log data when I get time to clean it up. Engine oil and coolant temps were not affected by the regen.

I'll log again in about a week once my DPF is over 50%.

Would be interesting to know if yours will now attempt a regen each time you drive it until it clears the DPF.

Would also be interesting to know if a regen would start and complete in a normal 20-30min drive through the suburbs instead of just on the open road at constant speed/rpm or above a certain speed etc.
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Old 02-04-2015, 06:32 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by XtRmn8 View Post
Engine oil and coolant temps were not affected by the regen.
That answers the question I was about to ask, I guess without the ODB2 monitor the only rough way to tell if a regen is occurring is fuel usage.....

Great info guys, thanks.
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Old 02-04-2015, 09:17 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Benn0 View Post
That answers the question I was about to ask, I guess without the ODB2 monitor the only rough way to tell if a regen is occurring is fuel usage.....

Great info guys, thanks.
When i capture another regen I'll post up some graphs of the data.

I suspected mine was doing frequent regens due to the instant/current fuel use increase and I was able to prove that via logging.
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Old 02-04-2015, 10:39 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by XtRmn8 View Post
Good info Steve.

Would be interesting to know if yours will now attempt a regen each time you drive it until it clears the DPF.

Would also be interesting to know if a regen would start and complete in a normal 20-30min drive through the suburbs instead of just on the open road at constant speed/rpm or above a certain speed etc.
There must be a certain minimum amount of loading where it will trigger an active regen. This is OK i guess as we would want it to be too intrusive.
Too often and it wastes fuel and at least some (a tiny fraction) of the extra fuel injected would have to make it past the piston rings, reducing the oil life.

I think it would keep going if had kept driving and didn't get held up at traffic lights for >2minutes.

I got to >70% and it started when I was doing only 30km/h in my street 100m from the driveway.

It was down a 56% this morning and didnt trigger on my "journey" to work (6.7km, 4 traffic lights).

I will go for a test on the highway tonight to see if it will trigger below 60% or 65%

I notice yours was triggered at 66% when you were on the highway.

>80% I assume is ECU panic mode with the EVIC message.




Quote:
Originally Posted by Benn0 View Post
That answers the question I was about to ask, I guess without the ODB2 monitor the only rough way to tell if a regen is occurring is fuel usage.....

Great info guys, thanks.
Yes that's right, there's pretty much no indication unless you have a "canine-like" sense of smell.
The instantaneous fuel display varies a lot as you as you drive of course. I dont think anyone would notice a change unless sitting steady on a flat straight freeway.

It does not take much extra fuel to heat the DPF to a controlled 550-650C. I saw only about 1.5L/h additional when running idling at 700rpm (and heating by 400C),
I'd expect a little more when more air is flowing through the system, but there normally more heat in the exhaust from driving at 100km/h.
I guess at 100km/h on the highway at 1700rpm it might be something like 2.5l/hr (2.5L/100km) more to increase by 300C.
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