Yamaha F225A Service Manual page 307

Explanation of each command
1. Diagnosis
The diagnosis codes, their corresponding part name, the diagnosing results, and the diagnostic cri-
teria are listed.
List 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)
2. Diagnosis record
The diagnosis code, its corresponding part name, the time of occurrence, and the total operation
hours are listed. This command enables you to check the record of malfunctions, which will assist in
reducing troubleshooting time. In addition, the diagnostic codes of malfunctions that have occurred
can be deleted from the ECM.
The items are the same as those listed above for Diagnosis, except no record of engine stop lan-
yard switch.
3. Engine monitor
The input signal of each sensor for the ECM is displayed.
In addition, the sensing item that is displayed can be changed.
Sensing 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)
4. Stationary test
With the engine off, operation tests are performed.
Test 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
5. Active test
With the engine running, operation tests are performed.
Test items:
Fully open ISC valve
Angle of ISC valve opening
69J3D11
Yamaha Diagnostic System
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