2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 331Get this manual
Yamaha Diagnostic System Opening the ISC valve angle: Set the opening angle of the ISC valve, and adjust the air volume when the engine is idlingThe operating time is 30 minutesBefore testing warm the engine up1Select the test to be performed, and then click the Select button or press the Enter key on your keyboard