so here we go i got a 97 civic ex with a jdm b18c swap im runnin a obd2a gsr ecu,, civic ex engine harness,,,,everytihng runs good and i can manuelly check the codes by jumping the blue plug but when i plug in my obd2 scanner it turns on and it starts to read the codes and then says no connection what going on is it not reading because of the ecu im runnin any input will help

 

is it a usdm gsr ecu?

JDM ecus do not have the protocall

 

how would i tell if it a jdm ecu

but that was what i was thinkng

 

i think it might be a European gsr ecu sounds correct ,,anyone know how can i tell

 

this may or may not help but i noticed on cars that if you take the light out for the check engine light behind the cluster. a code scanner will NOT work.

 

well the sticker on the ecu should point you the right direction, it'll say what it is and you'll just have to look for an ecu chart to find out what you have

 

know i believe it european isent the jdm ecu and the european ecu the same

 

Is the CEL bulb plugged in?

 

nvr mind did a little reasearch it is a jdm ecu thanks guy