2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 301Get this manual
Yamaha Diagnostic System Explanation of each command
1Diagnosis The diagnosis codes, their corresponding part name, the diagnosing results, and the diagnostic criteria are listedList of items: Condition of coils (pulser coil) Condition of sensors (throttle position sensor, intake air temperature sensor, intake air pressure sensor, and oil pressure sensor) Condition of battery (battery voltage) Operation of switches (shift position switch, engine stop lanyard switch, thermo switch, and shift cut switch) 2Diagnosis record The diagnosis code, its corresponding part name, the time of occurrence, and the total operation hours are listedThis command enables you to check the record of malfunctions, which will assist in reducing troubleshooting timeIn addition, the diagnostic codes of malfunctions that have occurred can be deleted from the ECMThe items are the same as those listed above for Diagnosis, except no record of engine stop lanyard switch3Engine monitor The input signal of each sensor for the ECM is displayedIn addition, the sensing item that is displayed can be changedSensing items: Sensors (throttle position sensor, intake air temperature sensor, intake air pressure sensor, and oil pressure sensor) Voltage system (battery voltage) Switches (shift position switch, engine stop lanyard switch, thermoswitch, and shift cut switch) Operation signals (ignition, injectors) 4Stationary test With the engine off, operation tests are performedTest items: Spark ignition coil for each cylinder Fuel injector for each cylinder Operation of the electric fuel pump Operation of the electric fuel feed pump Operation of the ISC valve 5Active test With the engine running, operation tests are performedTest items: Fully open ISC valve Angle of ISC valve opening