I do not know if this is the right sectin where to post my question.
As know to many of you I have been mapping an old FIAT Punto JTD 1.9.
So far so good...I only have one pount left...if I do diagnosis with FES I find DTC P0404 related to EGR device.
I exclude EGR by flattening the map so I guess this is the retrun from the mapping. Not a big deal as no warning light is on.
BTW I have been reading that DTC code can be cleared "deleting" or "zeoring" the values into the maps.
Is my understanding correct or I am wrong?
If this is correct how to find the DTC value for error code P0404?
Thank You.

EGR OFF by flattening the EGR map (actually this is expected MAF airflow) is not smart way to do the job.

For EDC15 ECU you look for EGR OFF switch in the file. If you disable the EGR via that switch the complete system is off and you do not need to delete no codes. The tuners delete codes when they do not disable the system correctly like in your case with flattening one map.

RPM freak wrote:EGR OFF by flattening the EGR map (actually this is expected MAF airflow) is not smart way to do the job.

For EDC15 ECU you look for EGR OFF switch in the file. If you disable the EGR via that switch the complete system is off and you do not need to delete no codes. The tuners delete codes when they do not disable the system correctly like in your case with flattening one map.

Thank you for you helpful reply. I read about switching, but as I am a newbye I was not sure what was better and followed that way. I would be glad to do as you suggest but I have no clue how to find the switch. Can you help me?

I searched the web and understood I need to locate the specifi bit. BTW non of the address I found are matching my map that is from an EDC15C7 Fiat 392-955 map

what about this (just found in another forum):

Try with 71FEA in 8bits. Change 1 to 0 and then disconect the electrovalve of the egr.

With the switch, turning off the EGR you turn off the throttle, which softly dampens the engine.
DTC is better here

Deman wrote:With the switch, turning off the EGR you turn off the throttle, which softly dampens the engine.
DTC is better here

Hi Deman, how are you?
You hints are always good, but I am not sure about my understanding. Do you mean better leave evrything as it is and keep the DTC error?
I agree with you as I read that in some cases swhithing off the EGR actually has some unwanted effects on throttle.
Regards from Italy.

EGR OFF switch - with or without exhaust gas recirculation, disables only EGR function of the ECU

Intake port shut-off Switch - with or without intake port shut-off valve, disables only intake port valve function of the ECU.

There are 2 different switches in this ECU.

So if you do EGR off via single 8 bit switch, you disable only the EGR function but you keep active intake port shut-off.

I miss something...I explain what I understand.

RPM freak wrote:EGR OFF switch - with or without exhaust gas recirculation, disables only EGR function of the ECU

- EGR OFF SWITCH: means to me disabling the ECU specific function no matter if the map is tuned (flattened or not);
- exhaust gas recirculation means to me the EGR opening/closing allowing ex gas reflowing into cylinders. Flattening the map means to me the valve will stay ALWAYS closed.

RPM freak wrote:Intake port shut-off Switch - with or without intake port shut-off valve, disables only intake port valve function of the ECU.

I am not sure about "Intake port";

RPM freak wrote: There are 2 different switches in this ECU.
So if you do EGR off via single 8 bit switch, you disable only the EGR function but you keep active intake port shut-off.

I did not know there are two different switches...I am going to study to better understand intake port. Should this port be manipulated/tnuied as well?...why?

maybe I am just making some confusion because of the laguage translation...are we meaning the intake valve as the "throttle valve?"