TSB's,Regeneration and Particulates

[MullenaxM]

There has been a lot of discussion in previous threads and post here lately to try to explain and possible get a better understanding of Cummins 6. 7L Emmission's Regeneration process. Not to negate or to dismiss any of the previous posts or threads here is my "two cents worth".

First off the Environmental Protection Agency (EPA) and The California Air Resources Board (CARB) both mandated that both Oxides of Nitrogen (NOx) and Particulate Matter("Soot") on diesel engines be reduced by 90% from the 2004 levels by the year 2007. Thus the reason for the Exhaust Aftertreatment

system on the 6. 7L diesel engine. I will try to explain the Aftertreatment process and the different Nix operation in my next post.

After the trucks where built and put on the market and sold it was discovered that the exhaust aftertreatment system was not operating as it was designed to operate. The vehicles were building up and excessive amount of particulate matter (soot) in the DPF (diesel particulate filter) and that the procedure used to enable the exhaust aftertreatment system to process the particulate matter, called regeneration, was flawed. The problem was found to be a Powertrain Control Module (PCM,Computer) application software issue. The PCM application software program was revised and updated to enable the exhaust aftertreatment system to process the particulate matter more efficiently. The application software program was then issued and made available to dealer technicians to install and reprogram PCM's on previously sold vehicles along with a technical service bulletin (TSB) explaining the reason for and the procedure to reprogram the PCM. The technical service bulletin number for the reprogram is 18-033-07. Since the TSB has been issued it has been update and rewritten two times with the last one being numbered 18-033-07 Rev. B. and dated June 28 2007. The TSB revisions do not change the PCM application software, they just better explain and update the procedure for reprograming the PCM and add to the diagnostic steps for determining if the reprogram of the software is operating correctly. Also this bulletin covers the DH/D1 body style truck only which is the truck built with a bed on it, there is a different TSB and reprogram for the Cab and Chassis truck.

 

[CUMMINZ]

I wonder if the reason why the chassis cab was not effected and the standard bed was? I do know that the chassis cab has a different exhaust configuration than does the standard bed.

 

[MullenaxM]

The cab and chassis gets a slightly different flash/reprogram because of different type of emissions components. The cab/chassis does not have a EGR by-pass tube and also it has only one DOC and uses a slightly different regeneration stratagy.

 

[Wolfy]

... here is my "two cents worth".

... I will try to explain the Aftertreatment process and the different Nix operation in my next post.

... Since the TSB has been issued it has been update and rewritten two times with the last one being numbered 18-033-07 Rev. B. and dated June 28 2007. The TSB revisions do not change the PCM application software, they just better explain and update the procedure for reprograming the PCM and add to the diagnostic steps for determining if the reprogram of the software is operating correctly.

Hi MullenaxM,



Thanks for your contribution to the "regen" knowledge-bank.

Looking forward to your next post.



One question about this one: Do the better explanation and updated programming procedure, along with the additional diagnostic steps, of REV. B ... make this revision desireable even if REV. A has been applied?



Thanks,

 

[jcarey]

One question about this one: Do the better explanation and updated programming procedure, along with the additional diagnostic steps, of REV. B ... make this revision desireable even if REV. A has been applied?



I don't see why it would. Basically, it sounds like a documentation update for the techs.



If there were a concern as to whether or not Rev. A was correctly applied, then maybe.

 

[CUMMINZ]

Differences in DPFs

For those of you who have not seen the difference in DPFs:



Chassis cab



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3500 Quad Cab regular bed



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[MullenaxM]

REV.A Vs. REV. B

There is no difference in the flash/reprogram between 18-0033-07 REV A. and 18-033-07 REV B. The only differance between the two is the diag. procedure and clairification of the steps you need to follow when performing the reprogram. If the steps are not followed the PCM can be damaged and become inoperible. If the reprogram is sucsessful then the techinician should be able to put the PCM in mobile regeneration mode and test drive the vehicle and perform a regeneration event.



I like the pictures CUMMINZ, Thanks!! Visual aids are always better than trying to paint a picture with words.

 

[MullenaxM]

By the way, The TSB # for the CAB/CASSIS is 18-009-07 Rev A. It is basically the same procedure and diag. as for the Pick-Up ,but is does not include taking the vehicle out and doing the mobile regeneration procedure. This reflash/reprogram is for vehicles built on or before 06/15/2007. I think there is a Revision coming to include the mobile regeneration procedure, but I have not been able to confirm that yet . I'll keep you posted.

 

[Jim Potteiger]

I have approx. 2100 miles on my 6. 7. I have had the PCM reprogrammed approx. 1700 miles ago. My truck has been running great with no codes of any kind. My truck goes thru a regen cycle every 60-70 miles. The regen cylce last for approx. 10-13 minutes. When in regen mode the exhaust temp. goes to 1200 degrees. Fuel mileage with no trailer and no load is getting 15-17 mpg. Oo.

 

[gsbrockman]

I had TSB 18-033-07 REV. B performed today.



My Service Manager was nice enough to allow me to keep the 10 page TSB. Lots of references I understand; a few that I do not understand.



There's different steps involved in the reflash dependent on any DTC's currently in the system. I feel quite confident that mine was properly done as sections of it were highlighted based on the lack of DTC's in my truck.



Greg