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  #901  
Old 03-04-2015, 11:46 PM
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Re: Is DPF issue for 2014 CRD fixed now?

Dumb question, was driving in heavy traffic the other day on the freeway, when we finally got out of it the speeds were back up to 100 then 110kph, the instant fuel consumption readout jumped into the 11's and normally at these speeds it's down in the 7's/100, could a forced regen have occured? I'm thinking a FG is triggered by raising combustion temps using extra fuel?

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  #902  
Old 03-05-2015, 02:35 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Roadkill View Post
Yes, please cross post it. We benighted NA owners are in dire need of more PIDs, and if I posted a link to your spreadsheet in another thread it would just seem tacky of me.



Ah, I was hoping that the 0181 (AECD) one would be the one that got reset, if any. I don't know of a good way to throw an innocuous DTC on a diesel to test this. If it were gasoline, I would just leave the cap unscrewed and invoke an evap code.



Actually, I'm pretty sure it should be C*65536.

You know, Torque supports bit shifts, so it seems you could easily restate the equation as (B<24)+(C<16)+(D<8)+E
OK i'll put up the spreadsheet in the NA thread with some notes later tonight.

Yes the 65535 is a typo in the spread sheet
the equation is (B*256^3)+(C*256^2)+(D*256)+E so yes it should be 65536. I have the correct value entered in the app i'm using.
The bit shift is easier then than all the multipliers, cool thanks for that.

The AECD stands for Auxiliary Emission Control Device, so I thought that would give us a total time count of the regen cycles.
BUT..... it doesn't for me I tested it out and got nothing but zeros back.



Quote:
Originally Posted by Roadkill View Post
BTW, since torque can also read individual bits we could conceivably create a custom PID for active vs passive DPF regen mode by extracting those B0/B1 bits from 8B. The only issue would be how to display it... I don't think Torque allows lookup table translation, so it would probably be a 0 through 3 digital display and people would just have to know that 3 is "active regen" mode, 2 is "passive regen" mode, and 0 or 1 is no regen in progress.

I think the PID would be

PID: 018B
Long Name: DPF Regen Mode
Short Name: DPF Mode
Minimum value: 0
Maximum value: 3
Scale Factor: 1x
Unit Type: mode
Equation: ({B:0}<1)+{B:1}
However, I haven't tested this yet. Note that those green things that look like curly braces in the equation are, in fact, curly braces and not parentheses.

Does anyone else feel like entering these custom PIDs is akin to having a GameGenie for their Jeep?

Yes when I first tried the DPF status i didn't know how to select an individual "bit". The {B:0} with "curly braces" does give the that bit response. However the Jeep doesn't seem to give the indication. {B:0} and {B:1} both remain at zero even when it is in regen sequence.
The calculated values for AVG-time between regens and AVG-dist between regens are also all zeroes.
The only one that seems to work in there is %DPF reading.


In the NA model you might get some data from the SCR system.
NOx adsorber is 01 8B {B:2}

Do you guys also have a PM sensor somewhere in there?
That might be on PID 01 8F , says it is supported on mine but again all zeros.
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  #903  
Old 03-05-2015, 03:08 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by Steve1307 View Post
Yes when I first tried the DPF status i didn't know how to select an individual "bit". The {B:0} with "curly braces" does give the that bit response. However the Jeep doesn't seem to give the indication. {B:0} and {B:1} both remain at zero even when it is in regen sequence.
Haha, there are few things worse than a half-implemented spec. I really appreciate you posting the J1979-DA datasheet... even if Chrysler only partially implemented it, it's a great resource.

Quote:
Do you guys also have a PM sensor somewhere in there?
Haven't checked yet. I find it really strange that, per spec, its normalized output is supposed to be a signed 16-bit/100 fixed precision, though. Mostly odd that it's signed.

Unrelated: do your burnoffs typically return your DPF to a 0% reading? I was somewhat surprised mine was still 9% at the end of the regen. Perhaps the algorithm controlling the cycle simply operates for a preset time rather than attempting to attain a goal state.
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Old 03-05-2015, 05:31 AM
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Re: Is DPF issue for 2014 CRD fixed now?

No usually 8.2% after burnoff.

We have received some strange readings here from the service centres after going into limp mode. On two of mine they were 113% and 108%.
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  #905  
Old 03-05-2015, 07:12 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by dixonf View Post
No usually 8.2% after burnoff.

We have received some strange readings here from the service centres after going into limp mode. On two of mine they were 113% and 108%.

Had 124% on mine in Nov last year. Now with the dongle and Steve 1307 custom PID I monitor periodically (work and back) the DPF status and have the tablet plugged in for all long trips.

Last regen had the DPF at 64.7% full and the fuel increased to about 10/100. This lasted for 15 to 20 minutes and then the reading dropped to 8.2% and fuel reduced back to normal.

That said, have done one airport trip since and many trips to work and the DPF is only 55% full so it is doing partial burns I believe as it was at 59% last time I looked before the airport run and many days of work runs after.

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  #906  
Old 03-05-2015, 07:18 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by dixonf View Post
No usually 8.2% after burnoff.
Thanks.

Quote:
We have received some strange readings here from the service centres after going into limp mode. On two of mine they were 113% and 108%.
Yeah, unless there is a secret, second DPF capacity reading available as a Chrysler-specific field, any ability to report above 100% would require god to send angels down from heaven carrying another binary bit to tack onto the data field reading. Conversely, Chrysler could have broken the spec and decided 0xFF was some value greater than >100% (e.g. an equation like (C*125)/255), which would mean that all of our DPF % custom PID readings are artificially low.

What's the highest DPF % a dealer has ever reported on someone's Jeep?

Quote:
Originally Posted by adriwood View Post
That said, have done one airport trip since and many trips to work and the DPF is only 55% full so it is doing partial burns I believe as it was at 59% last time I looked before the airport run and many days of work runs after.
My experience during pure highway driving is that I will get a ~10 minute active regen every ~400 km (as measured by temperature excursions to the regen range). I wasn't monitoring DPF capacity in the past, however.

I find it strange that none of the NA owners have reported any of the limp mode DPF issues you gents have. I mean, my DPF was at 100% and the Jeep had nary a complaint. I can't decide if having to deal with SCR on the NA model is a fair trade (the plastic DEF injector practically has "snap off here for your vehicle disablement convenience" written on it).
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  #907  
Old 03-05-2015, 08:08 PM
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Re: Is DPF issue for 2014 CRD fixed now?

I think the EVIC display might be a Chrysler specific parameter, so I don't know whether the DPF% that we are reading of the "standard Mode 01 list" is exactly the same as the one that comes up on the EVIC or the WiTech diagnostic machine.
Our "normalised" equation will only allow 0-100% from scaling the 0-255 raw value from the parameter.
.
.
.
I can't seem to get my DPF% more than 72%. - never had an EVIC message.
The earliest i have ever noticed it trigger was 65.1% at highway speed.

I did another regen on the way home last night in a 10minute journey starting at 71.6% and it only got a few minutes worth of soot burn before driving into my garage.
When the roller door came down there was that faint burning rubber smell. (funny I don't remember going to the local skid pan this evening).

This morning DPF is at 46%.

Normally with a full regen sequence it'll go down to between 6 - 9%.
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  #908  
Old 03-07-2015, 06:34 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by SNUKE View Post
I don't think 10 mins is sufficient warning for a lot of people. Peak hour travel can be a killer, even of on a freeway, you may still only be doing walking pace if that sometimes.
Can you imagine the fun of going into limp mode in an M5 traffic jam?
Having a visible warning at 65% allows people some good notice and the ability to alter their route if required.
Yes. It's basically like being given a car with the rear passenger wheel missing and being told that you must always turn right or drive straight ahead or it will tip over.

In short, it's a major design fault. The requirement to drive at Highway speed for 20-30 minutes a week is a smokescreen.

I have heard that our local Jeep dealer is buying back MY14 Jeeps because they are concerned about their reputation. Other faults have included loss of cruise control, multiple warning lights and loss of the entire console indications while driving. I don't know how widespread this is. In one case, the DPF was replaced on two separate occasions on the one vehicle.


Having said that, I have not had a single fault since the TSB Software update in December.
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Old 03-07-2015, 06:53 AM
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Re: Is DPF issue for 2014 CRD fixed now?

driving at highway speed is a total joke.
i finally stumped up for a bluetooth obd2 adaptor and torque pro app. chucked the pid settings in

drove brisbane-gold coast on the m1. 100 to over 110 when overtaking
the dpf % full did not go down over the whole trip sat at 33% regardless of speed. catalytic temps sat on ~320C

i do 2 trips there and back, twice a week and i had 2 dpf limp modes early on 1900km and ~19000km. the driving at >109kph is a crock of shit as demonstrated by the obd2 readings now

usual story of trying to find something to blame but themselves
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  #910  
Old 03-07-2015, 07:29 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Quote:
Originally Posted by fireball View Post
driving at highway speed is a total joke.
i finally stumped up for a bluetooth obd2 adaptor and torque pro app. chucked the pid settings in

drove brisbane-gold coast on the m1. 100 to over 110 when overtaking
the dpf % full did not go down over the whole trip sat at 33% regardless of speed. catalytic temps sat on ~320C

i do 2 trips there and back, twice a week and i had 2 dpf limp modes early on 1900km and ~19000km. the driving at >109kph is a crock of shit as demonstrated by the obd2 readings now

usual story of trying to find something to blame but themselves
The driving at 100km/h and over will not help at all when the regen cycle is not active. The DPF will fill a lot slower if you drive at constant highway speed and the engine is at normal operating temperature. vs your general short trips that many of a us do.

Driving at highway speed will help the regen process complete faster I believe once it is triggered and guarantee that it will complete. If you are stationary in traffic for a couple of minutes an active regen may stop, so this is the only time driving at highway speed will help.

Get the Dec DPF related PCM update applied and enjoy your Jeep
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  #911  
Old 03-08-2015, 01:57 AM
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Re: Is DPF issue for 2014 CRD fixed now?

Sorry, but I still don't get the whole driving at highway speed to build up heat. What generates more heat? driving in suburbia, up and down gears, revving to accelerate and braking and sitting in traffic or lopping along on the freeway at 2000 rpm with heaps of airflow?

I guess you who are monitoring the temps closely can fill me in but it all seems counter initiative.

My MY12, even without the recovery hooks, seems like the model to have - all it's issues appear to be sorted, touch wood!


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  #912  
Old 03-08-2015, 03:33 AM
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Quote:
Originally Posted by GMWK2 View Post
Sorry, but I still don't get the whole driving at highway speed to build up heat. What generates more heat? driving in suburbia, up and down gears, revving to accelerate and braking and sitting in traffic or lopping along on the freeway at 2000 rpm with heaps of airflow?

I guess you who are monitoring the temps closely can fill me in but it all seems counter initiative.

My MY12, even without the recovery hooks, seems like the model to have - all it's issues appear to be sorted, touch wood!

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