Will try? to explain even better , the unit has two connections , one connection, and wires in the wiring harness , if you follow goes towards the engine and connects to the injectors, sensors, etc ... , the other goes to, let's say the passenger compartment of the vehicle , this connection that goes into the passenger compartment ? the right one , you will now see that the connection has a security immediately above that covers the wires , ok you're at it , take away the security of your connection then identify the pin 20 , which if you look closely at the connection, and marked, at least at the ends of the connection are the initial pin , and then you just count , insert a pin to pin 20 , leaving attached at the connection to the ecu , put it to the ground , then, for example, on the basis of the control unit , turn on the framework, leaving the wire to ground for a few seconds and at this point, you put the ecu into boot mode and now run by the reading of the flash of the ecu , I hope I was clear , but sorry for the question , what do you do ???