Yamaha 2004 YP400, Service Manual, Page: 308 / 417

7 - 7
FI
FUEL INJECTION SYSTEM
EAS00905
DIAGNOSTIC MODE
It is possible to monitor the sensor output data
or check the activation of actuators without
connecting the measurement equipment by
simply switching the meter indication from the
normal mode to the diagnostic monitoring
mode.
Setting the diagnostic mode
1. Turn the main switch to “OFF” and set the
engine stop switch to “OFF”.
2. Disconnect the wire harness coupler from
the fuel pump.
3. Simultaneously press and hold the
“SELECT” and “RESET” buttons, turn the
main switch to “ON”, and continue to press
the buttons for 8 seconds or more.
NOTE:
• All displays on the meter disappear except
the clock and tripmeter displays.
• “dIAG” appears on the LCD meter.
4. Press the “SELECT” button to select the CO
adjustment mode “Co” or the diagnostic
mode “dIAG”.
5. After selecting “dIAG”, simultaneously press
the “SELECT” and “RESET” buttons for 2
seconds or more to execute the selection.
6. Select the diagnostic code number that
applies to the item that was verified with the
fault code number by pressing the
“SELECT” and “RESET” buttons.
NOTE:
• The diagnostic code number appears on the
LCD meter (01-70).
• To decrease the selected diagnostic code
number, press the “RESET” button. Press
the “RESET” button for 1 second or longer to
automatically decrease the diagnostic code
numbers.
• To increase the selected diagnostic code
number, press the “SELECT” button. Press
the “SELECT” button for 1 second or longer
to automatically increase the diagnostic code
numbers.
01 70 70 01