2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 296Get this manual
TRBL SHTG
Troubleshooting
Operating Connecting the computer to the outboard motor
NOTE: Be sure to use the enclosed communication cable to connect the computer and adapter to the outboard motor1Quit any applications that are running, and then turn off the computer2Connect the communication cable to the 3-pin communication coupler of the outboard motor, the adapter, and the communication port of your computer