Cummins ECM Hacking

[realsquash]

Group,



I've reprogrammed a few GM EFI computers for my various projects and I'm keen on doing the same to my 03 CTD. It's all computer controlled and all this bolt-on box stuff seems very archaic to me. Faking out the fuel pressure? Bah! The best way to control pulse width would seemingly be from the device that controls it, the ECM on the engine itself.



Does anyone know what make these are? Has anyone done anything with them? Anyone got one that I can take apart and fool with?



Thanks,

Andy

p. s. I am my own warranty station.

 

[willyslover]

Andy . . use your search button. . many many treads and posts on the topic in the past . . all second gen related

a good place to start is using the user name Marco in the search

Or old threads with TST

 

[realsquash]

Oh stupid me forgot there was a CTD before 03 Thanks a lot for the wakeup call.



Andy

 

[Gary - K7GLD]

Whatever happened to Marco - sure could use him on these hesitation questions...

 

[jrobinson2]

Whatever happened to Marco

He's still here Gary, ya just gota keep yer eyes open

Marco's last post

Jared

 

[Gary - K7GLD]

Good to see he'still active here - gotta get him to look at our hesitation problem...

 

[Marco]

CR ECM

Yup still here...



Let's talk about the Common Rail ECM.



Make, Motorola like the VP ones.



The only way to modify it is via OBD. The flash prom resides inside the all new MPC555 Motorola CPU. No chip to unsolder there...



But hey, one can always hack the OBD flash protocoll...



Marco

 

[GGades]

I can't find a chart for a 7000lb package via Fed Ex to Via Pinzon, Italy.

 

[realsquash]

Re: CR ECM

Originally posted by Marco

But hey, one can always hack the OBD flash protocoll...

Hmmm... . I wonder... I need to befriend someone at a Dodge dealer so I can abuse whatever they use to update the ECM.



Andy

 

[Agades]

I think theres enough of us that could use his services to round up enough money to ship him and his equipment to us

 

[realsquash]

IMHO I think this should be an open project. There are certainly more than one person with the skills to conquer this task and a group would get it done faster.



I wish some disgruntled Cummins employee would just send all the documentation out so we don't have to work so hard.



Andy

 

[Marco]

Hmmm... . I wonder... I need to befriend someone at a Dodge dealer so I can abuse whatever they use to update the ECM

Yup, not that I know anything about it... it's a loooong way to go. .

I think theres enough of us that could use his services to round up enough money to ship him and his equipment to us

I can't do anything for the CR folks... yet. For the VP, all you need to do is to send me the ECM... .



IMHO I think this should be an open project. There are certainly more than one person with the skills to conquer this task and a group would get it done faster.



Open project?



Once you start to spend YOUR money and YOUR time (both in great amount) would you share? Honestly!



Let me tell you this, there would be someone, somewhere, who would take advantage from YOUR work.

Not for me...



For the group part.

Find the people in the know, then let's talk.



I wish some disgruntled Cummins employee would just send all the documentation out so we don't have to work so hard.



Me too... Me too!

Only one problem, it will never happen...



Marco

 

[realsquash]

I hear ya Marco. I have been part of the DIY-EFI group for years and that group really benefitted from everyone's collective knowledge. The gasoline EFI tuning wouldn't be anywhere near what it is now w/o that group.



And yeah, I spent my money and my time to help with projects that other people used. So did countless others.



Andy

 

[Marco]

I hear ya Marco. I have been part of the DIY-EFI group for years and that group really benefitted from everyone's collective knowledge. The gasoline EFI tuning wouldn't be anywhere near what it is now w/o that group.

Well where do I start?

Let put it in this way. I've worked on the D-MAX too.

(Shame on me, but hey I've been paied for it. . )



In 5 days I've found out more in that file than what I've been able to dig out from the Cummins file(s) in 3 years.



Yes that's FIVE days VS. THREE YEARS!



The GM softwares are... well I'd say "userfriendly"...





The Cummins stuff is different from anything else out there...



Start a Cummins hacking group, maybe I'll chime in.



Marco

 

[realsquash]

Oh yeah, GM is really nice in that respect. Is the Duramax ECM a Delphi/Delco product? Maybe we should retrofit that sucker on the Cummins



Why not, I got a V8 gas efi ecm running 2 cylinders on my bench



I wonder how much interest there would be in a Cummins ECM group? Hmmm... .



Andy

 

[Marco]

OOOOOpppsss , just lost my reply...



Yup, the D-Max uses a Delphi unit. Very similar to the gasser unit. In addition to the the Delphi PCm they use also a "fuel module" made by Bosch. The fuel module only has control over the Common rail. Everything else is under the supervison of the Delphi PCM. Oh, yeah, also the transmission has it's own TCM.



Marco

 

[Gary - K7GLD]

TO get more to the point,Marco, have you followed any of the surge/hesitation problems noted by a number of 2nd and 3rd generation owners, usually seeming related to power boxed trucks operating in cold temperatures? If so, do you have even a knee-jeck opinion on possible cause and cure, keeping in mind all the peripheral sensors and controls in many cases have been eliminated as the source of the problem?



HELLLLLLLLP!

 

[Marco]

Yes.

I can only talk for the VP ECM.



I've had problems with that "hesitation", "bucking" with a few stock fuelling curves. Modified them and no more problems.



I don't know for sure if that's the cure for the problem you're having. Sure enough it sounds to me exactly what I've seen...



Marco



P. S. There are several different SW's with different fuelling curves out there. Some seem to be more prone to the "hesitation"

 

[realsquash]

Originally posted by Marco

OOOOOpppsss , just lost my reply...



Yup, the D-Max uses a Delphi unit. Very similar to the gasser unit. In addition to the the Delphi PCm they use also a "fuel module" made by Bosch. The fuel module only has control over the Common rail. Everything else is under the supervison of the Delphi PCM. Oh, yeah, also the transmission has it's own TCM.



Marco

OK now my curiosity is running rampant! I think I need to find a dmax ECM to play with, I bet those aren't cheap. :{ Wanna play gotta pay!



Andy

 

[Gary - K7GLD]

"I've had problems with that "hesitation", "bucking" with a few stock fuelling curves. Modified them and no more problems. "



That's pretty much been my conclusion as well - some fuel-map issues aggravated by various sensor inputs in cold weather, and complicated by added power boxes - probably too expensive and complicated for ordinary owners to correct, and DC sure isn't gonna do it!