Possible solution for EGR block code (P0401)?? - Dodge Cummins Diesel Forum

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post #1 of 3 (permalink) Old 02-24-2010, 01:05 PM Thread Starter
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Possible solution for EGR block code (P0401)??

In the duramax world (I just traded my dmax for a 2010 laramie 6.7) we had something called a finger stick that would trick the computer into thinking that the EGR system was still working. We would use a blocker plate and install this electronic finger stick and it would never set a code.

I think the computer knows that the EGR is working by seeing a reduction in flow on the MAF. (I am assuming the cummins has a MAF). I would assume the flow on the MAF is compared to a table in the ECU and the difference between measured flow and the flow indicated on a VE table would be seen as EGR flow.

The finger stick had 5 wires.

+12
GND
MAF signal IN
MAF modified signal OUT
EGR Motor signal IN

The EGR motor looks to be the same between the duramax and the cummins so I am hoping something similar is possible.

I would assume (im no EE, only a lowly computer programmer) that this finger stick would take a position signal from the EGR motor and use that signal to scale the signal from the MAF so the measured airflow through the MAF increases/decreases as the EGR motor opens and closes.

It may even be possible to use one of these finger sticks from a duramax but we would need some electrical engineer type to compare the MAF signals between the two engines and possibly compare the the EGR motor signal so we can determine if the scaling would be correct.


Fingerstick instructions if anyone is interested.

http://www.kennedydiesel.com/docs/Fi...%20Install.pdf

It would be awesome if a similar device could be created for the cummins. If so we could block the cooler off at the manifold and leave the hardware in place, the blocking would be completly invisible to emissions techs and dealers.


2010 RAM 2500 Laramie Crew 4x4 with the C option.
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post #2 of 3 (permalink) Old 02-24-2010, 07:09 PM
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It is an interesting theory though. I wonder what signal changes would have to be made to make the truck think everything is still working?

Do the Chevy trucks utilize the same/similar CAN BUS system that Dodge uses?

Would the system have to change inputs based on load and EGTs?

Anybody have access to a data logger that could be tapped into the required sensors to gain the required information?

John
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Details and Instructions at CarboniteCummins.com

Last edited by Flopster843; 02-24-2010 at 07:12 PM.
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post #3 of 3 (permalink) Old 02-24-2010, 07:18 PM Thread Starter
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Quote:
Originally Posted by Flopster843 View Post


It is an interesting theory though. I wonder what signal changes would have to be made to make the truck think everything is still working?
The stick would have to decrease the signal from the MAF to show flow from the EGR.


Quote:
Originally Posted by Flopster843 View Post
Do the Chevy trucks utilize the same/similar CAN BUS system that Dodge uses?
Yes, i think everyone does now.

Quote:
Originally Posted by Flopster843 View Post
:
Would the system have to change inputs based on load and EGTs?
I dont think it does, it just scales the output based in the input.

2010 RAM 2500 Laramie Crew 4x4 with the C option.
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