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how do i read from my 08 smart fortwo 451 ecu

hi. question is there anyone here who has the ecu pin out for a 2008 smart fortwo cabrio 451 i believe. i looked everywhere and cant find it also i am not sure what wire i need to ground out and if there is a time limit to how long u should have it grounded? i have looked at a post somewhere before and it said you can leave the ecu connected to the car and where the wires go in there should be an empty hole with out a wire in it and so u put a wire in and thats the wire u ground out to get the ecu into boot mode. i am not sure if its for the smart car i have or not though cause mine has like 3 in a row that are empty and a few others in between wires and stuff on the small plug. if anyone has read from a 451 ecu before how did you do it?? i am trying to back mine up and then maybe remove the rev limit.
 
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