Pin 82 often handles the ignition-switched power signal.
If you want, tell me your vehicle model/year and the ECU part number (printed on the ECU) and I’ll attempt to provide a more specific pinout. mitsubishi 4m51 ecu pinout work
The foundation of any ECU operation is a stable power supply. The pinout will designate specific pins for constant battery power (often labeled +B or BATT), ignition-switched power (+IG), and ground (GND or E1/E2). Pin 82 often handles the ignition-switched power signal