Yamaha YZ450F Owner's Service Manual page 196

SETTING THE DIAGNOSTIC MODE
When the FI diagnostic tool is set to
the diagnostic mode, the sensor out-
put data can be displayed and the op-
eration of the actuators can be
checked.
1. While pressing the "MODE" but-
ton, set the switch on the FI diag-
nostic tool sub-wire harness to
"ON".
• When the switch on the FI diagnos-
tic tool sub-wire harness is set to
"ON", make sure that "Waiting for
connection" is displayed on the
LCD of the FI diagnostic tool.
• "DIAG" appears on the LCD of the
FI diagnostic tool.
2. Select the diagnostic mode "DI-
AG" by pressing the "UP" button.
3. After selecting "DIAG", press the
"MODE" button.
4. Select the diagnostic code num-
ber corresponding to the fault
code number by pressing the
"UP" and "DOWN" buttons.
• Select the diagnostic code number
corresponding to the fault code
number by pressing the "UP" and
"DOWN" buttons.
• To decrease the selected diagnos-
tic code number, press the "DOWN"
button. Press the "DOWN" button
for 1 second or more to automati-
cally decrease the diagnostic code
numbers.
• To increase the selected diagnostic
code number, press the "UP" but-
ton. Press the "UP" button for 1 sec-
ond or more to automatically
increase the diagnostic code num-
bers.
5. Check the operation of the sensor
or actuator.
• Sensor display: Data indicating
the sensor status is displayed on
the LCD of the FI diagnostic tool.
• Actuator operation: Press the
"MODE" button to operate the ac-
tuator.
6. Set the switch on the FI diagnostic
tool sub-wire harness to "OFF".
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FUEL INJECTION SYSTEM