2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 317Get this manual
Yamaha Diagnostic System Operating injector procedure:
A voltage is applied to the injector of the selected cylinder, the injector is activated, and then the fuel system is checkedThe fuel is injected 20 times within two seconds
WARNING
Do not perform the test with the injector removed from the cylinder head or with any fuel system parts removedHigh-pressure fuel may spurt out When performing the this operation, keep all sparks, flames, or other sources of ignition away from the testing areaGasoline is highly flammable1Select the test that you wish to perform by either clicking it or pressing the up or down arrow keys on your keyboard(Fig29)