Hello,

I have found a way to cheat the EGR operation on a Citroen/Peugeot 1.6 HDi engine with EDC16C34 ecu.
The maps in question are two 8x1 linear maps that adjust EGR control depending on outside temperature. EGR duty cycle is reduced during cold weather, and with those maps you can completely turn it off through the whole temperature range.

After this mod the EGR duty cycle shows 0 percent, the idle air flow has increased and there is no DTC about that but since this is only a cheat and not a true switch - the EGR valve must be connected and operational.

You can find the two maps by following simple instructions:
Go through all the driver wish maps, untill you see a EGR map (I've attached a picture). Then go to the next map, found by winols (16x16 replacement air data) and a few lines after that you will find a line 00008 (number of axis values), with some temperatures following it 2331 - 3131 (with 0.1 factor and -273 offset it means -40 up to +40 degrees) with values ranging from 64 to 128 in the map. Set all 8 values to 0 in both maps (one after another) and you will get 0 percent EGR duty cycle without any DTC.

Good luck

hi,
nice post. Did you managed to find switch 1/0 ?

Nope, still looking for it.
I have a damos from a bmw edc16c35 and from a honda edc16c31, I have some possible locations and once I find it - i'll share. I believe the switch should be somewhere near the temperature correction maps.

Just don't try to make changes in the very beginning of the file - the car won't start and you'll need to bdm it :)

If you like you can post Honda edc16c31 damos in damos file section.

Some good infor about EGR removal with various ECUs can be found below. Click the .html, it should open ok in your browser.
I know it's in italian but the screens and ECU codes speak for themselves.

You need to be a forummember to view the pictures.

Nicowico wrote:You need to be a forummember to view the pictures.

edited to change the link to an attached HTML page. Should do the job now.

Hi,

2007 Citroen C4 1.6HDI 110 HP

EDC16C34
1037386118



In this file, where I find maps of the EGR?

How do I turn?

Thank you in advance for your help!

+1 images are too small and have to be a member.
:(

Relic wrote:+1 images are too small and have to be a member.
:(

I attached an HTML data folder and file. You have to open it and use the data that's in the folder, on my system Chromium will do it automatically, maybe it depends on the system.