some ecu's they can program the EGR side of things so it only turns on at some never achievable setting. however afaik no one has reprogrammed these ecu's.
you can't trick the ecu otherwise for eg it will run on the cold map constantly.
fortunatly these ecu's are not full OBD2 so they don't monitor the egr system as tightly as say a petrol motor. hence the ecu doesn't really know the egr is not working. it only checks the valve itself. as long as the coils don't blow it thinks its all fine. (which i think is the cause of some of the problems these get. ecu doesn't know if valve is stuck.)
you can't trick the ecu otherwise for eg it will run on the cold map constantly.
fortunatly these ecu's are not full OBD2 so they don't monitor the egr system as tightly as say a petrol motor. hence the ecu doesn't really know the egr is not working. it only checks the valve itself. as long as the coils don't blow it thinks its all fine. (which i think is the cause of some of the problems these get. ecu doesn't know if valve is stuck.)