I have some problem to read an ecu Bosch ME 7.3H4 Hibrid (Fiat punto 1200 cc 16-valve) as following the instruction of the reading interface read "turn OFF AND turn on ONLY the ECU AND CONTINUE by PRESSING OK".

The pin out of the ecu I have made these links
+ 12v = pin 51, 49, 33, 17, 18
GND = Carcass ECU
K-lineP pin 53

What I don't understand how to do it (which is the pin that I have to disconnect the power) to "turn off and riaccedendere only the ECU......." as in the directions above.
Thanks