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  #949  
Old 03-12-2015, 07:16 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Thanks.

I'll get the update done ASAP, but at least in the meantime I can monitor it all.


Someone will correct me if I'm wrong, but there is normally no dash message IF it can achieve the Regen because of where, and when you're driving.
I've never had a dash message, though I do mostly longer drives and a lot of towing.
I've certainly seen the fuel consumption rise and seen the Cat temp rise associated with a passive Regen, at a wild guess maybe every 7-800 klms. Now I have also got the ability to watch DPF% full thanks to Steve.

I think that if I did more short hops there would be far more chance that I'd get the dash message, and even far more chance of limp mode.

However with only about 6k on the clock, hopefully it will all be good till I can find the time to get the Dec18 update done- along with the various other recall items.

Cya
David

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  #950  
Old 03-12-2015, 07:20 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by iboughtajeep View Post
I was under the impression that if you did drive on a highway long enough (20 min or so) then the DPF was to burn off with out the need for the computer to inject diesel during the exhaust stroke. Like i mean, why do it only at highway speeds if the computer can make the car do it any time?
Am i the only one who thought this? Like i mean, we were all talking about Passive and Active regens. Now it seems there is only 1.
Ahhh, confusing isn't it?

So passive regens will occur all the time when driving normally and the engine temps up to normal. But this isn't enough to prevent clogging, the temps need to be up around 600degrees to fully burn off the soot, passive regens are 200 and something, so they will burn some, but not all.

The active regen is when the engine computer shuts the EGR (exhaust gas recirculation makes combustion temps cooler, so closing this off makes the exhaust gasses hotter), and pumps diesel down the exhaust post ignition.

Big question, why does this have to happen on the highway, and not stationary or in traffic? Well I think the process probably requires higher revs than idle to keep the exhaust temps up, and also the heat and smell can be dissipated at speed. But from the monitoring we've seen you don't need to be at highway speeds for a regen to occur, it will happen in traffic, as long as you aren't idling for more than 2 mins.

I guess by saying 'drive on the highway for 20 mins' it removes the possibility the regen process will be interrupted by being stuck in traffic......
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  #951  
Old 03-12-2015, 08:28 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Benn0 View Post
Ahhh, confusing isn't it?


The active regen is when the engine computer shuts the EGR (exhaust gas recirculation makes combustion temps cooler, so closing this off makes the exhaust gasses hotter), and pumps diesel down the exhaust post ignition.

Big question, why does this have to happen on the highway, and not stationary or in traffic? Well I think the process probably requires higher revs than idle to keep the exhaust temps up, and also the heat and smell can be dissipated at speed. But from the monitoring we've seen you don't need to be at highway speeds for a regen to occur, it will happen in traffic, as long as you aren't idling for more than 2 mins.

I guess by saying 'drive on the highway for 20 mins' it removes the possibility the regen process will be interrupted by being stuck in traffic......
I've seen the temporary fuel increase and EGT ("Cat temp") rise to up over 600C probably four or five times but have never had any kind of message associated with it since new.
So is this because I've been driving at highway speeds at the time anyway? Or is there something else at play here?
It's amazing how little Jeep tell us about it, and how much dud information is spread by dealer service personnel. I'd suggest many of them know less about it than many of us do!

If I heard from somebody at the dealership words to the effect "I'm not exactly sure how it works, but I'll find out more and get back to you." I'd be entirely happy with that for now, (assuming they DID actually get back to me) but some of the idiotic bloody statements coming from service personnel are just blatantly wrong!

Sadly, it's no different though from many sales staff on just about anything you buy these days- they just don't know, and are happy to give totally false information without doing some homework.
Trouble is, these people are SERVICE personnel, and should know. The last time I spoke to the service manager about DPF problems in roughly October, he said:
"There were no problems." (Yeah right!)
"Just put your foot down and you won't have issues."

Gee, that's sooooooo helpful!



Cheers
David
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  #952  
Old 03-12-2015, 09:43 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Futuresystem View Post
I've seen the temporary fuel increase and EGT ("Cat temp") rise to up over 600C probably four or five times but have never had any kind of message associated with it since new.
So is this because I've been driving at highway speeds at the time anyway? Or is there something else at play here?
Well I remember when the MY14 was first out owners would report seeing a message stating the car is in regen and to keep driving while a percentage counted down. Pretty sure Oz owners were reporting this too.

But it seems Jeep have changed this behaviour, and no indication is given except when the filter is almost full.

Perhaps owners were panicked by the message so Jeep decided to remove it with an update..... I remember one US owner asking why their car was broken after seeing the regen message come up. It wasn't broken, it was working.
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  #953  
Old 03-12-2015, 09:48 PM
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Re: Is DPF issue for 2014 CRD fixed now?

DPF messages:







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  #954  
Old 03-12-2015, 10:37 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Thanks.

What a shame they removed all that information.
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  #955  
Old 03-12-2015, 11:07 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Futuresystem View Post
If I heard from somebody at the dealership words to the effect "I'm not exactly sure how it works, but I'll find out more and get back to you." I'd be entirely happy with that for now, (assuming they DID actually get back to me) but some of the idiotic bloody statements coming from service personnel are just blatantly wrong!
Just on this, it would be great if Jeep Oz got one of their technical experts with some knowledge of the dpf system to do a tour of Jeep workshops to explain to Jeep mechanics how it works, under what conditions regens occur and some basic troubleshooting tips. There seems to be a huge knowledge gap here for those who are supposed to be able to fix a complex and problematic part of the car.

I don't suppose an email to aucustomercare@fcagroup.com suggesting this is going to achieve much....
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Old 03-12-2015, 11:23 PM
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Re: Is DPF issue for 2014 CRD fixed now?

All JA head office staff are too busy watching the polo. It ain't going to happen.


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  #957  
Old 03-13-2015, 03:25 AM
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Quote:
Originally Posted by Benn0 View Post
Just on this, it would be great if Jeep Oz got one of their technical experts with some knowledge of the dpf system to do a tour of Jeep workshops to explain to Jeep mechanics how it works, under what conditions regens occur and some basic troubleshooting tips. There seems to be a huge knowledge gap here for those who are supposed to be able to fix a complex and problematic part of the car.

I don't suppose an email to aucustomercare@fcagroup.com suggesting this is going to achieve much....
This would only work if they (the mechanics) actually wanted to know. My guess is they really dont care.
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  #958  
Old 03-13-2015, 08:37 PM
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Re: Is DPF issue for 2014 CRD fixed now?

When are repair manual comes out that I can get my hands on with all the wiring diagram info and such a DPF delete will be high on my list of priorities (especially outside warranty).

As it is using pressure differences/ratio as I understand it, it won't be hard to trace down the appropriate sensors and replace them with a resistor of the appropriate value to trick the system into thinking the DPF is always low/clean. It's like the O2 sensor delete option often employed on motorcycles and cars etc.. That is if the sensors are returning a variable resistance, but whatever signal is returned can be hijacked and then we can remove this DPF shenanigans at least after warranty period.. I cannot fathom why a full particulate filter puts a car in limp-mode when all it is doing is not capturing as much soot/particulate matter as it is meant too, that's just dangerous (throw a car into limp mode on a motorway or busy road without a shoulder is way more dangerous than a few particles floating around because it's not meeting some euro-version diesel compliance for pollution).

If anyone can point me into a wiring diagram/workshop manual that does give the appropriate sensor return ranges I'm happy to get to work..
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  #959  
Old 03-13-2015, 09:18 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Futuresystem View Post
Thanks.

What a shame they removed all that information.
Gents.

As an MY14 owner since July 13, I can definitely advise that the regen messages have not really changed in that time. I have had four messages in nearly 30000kms. First was 80% full keep driving. Second was ha! ha! too late, 100% full and limp mode. Third was a 90% full whilst on the highway and the other day another 80% full message. Since Steve 1307 developed the custom PID for Torque I have also seen a regen cycle (64.7% to 8.2%) whilst travelling at 110kph, fuel was up and exhaust temps reached 575+. I am also convinced that the filter is doing mini cleans on acceleration as the %full drops after the boot has been put in to the driving style.

Regards

Adrian
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  #960  
Old 03-14-2015, 06:04 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Mate could you check if your service paperwork actually states that the 14/104 was done? This is really important to all us MY14-> owners. I'm hoping that it's been missed, or has been incorrectly executed.

Cheers,
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