Yamaha YP125R, Service Manual

Page: 432 / 498

FUEL INJECTION SYSTEM
8-35
Setting the diagnostic mode
1. Set the main switch to “OFF”.
2. Disconnect the self-diagnosis signal coupler, and then connect the FI diagnostic tool “1” as shown.
3. While pressing the “MODE” button, set the main switch to “ON”.
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• “DIAG” appears on the LCD of the FI diagnostic tool. If “CO” appears on the LCD of the FI diagnostic
tool, press the “UP” button to select “DIAG”.
• The “POWER” LED (green) comes on.
4. Press the “MODE” button.
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The diagnostic code number “D01” appears on the LCD of the FI diagnostic tool.
5. Select the diagnostic code number corresponding to the fault code number by pressing the “UP” and
“DOWN” buttons.
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• The diagnostic code number appears on the LCD (01-70).
• To decrease the selected diagnostic code number, press the “DOWN” button. Press the “DOWN” but-
ton for 1 second or longer to automatically decrease the diagnostic code numbers.
• To increase the selected diagnostic code number, press the “UP” button. Press the “UP” button for 1
second or longer to automatically increase the diagnostic code numbers.
6. Check the operation of the sensor or actuator.
• Sensor operation
The data representing the operating conditions of the sensor appear on the LCD.
• Actuator operation
Press the “MODE” button.
7. Set the main switch to “OFF” to cancel the diagnostic mode.
8. Disconnect the FI diagnostic tool and connect the self-diagnosis signal coupler.
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Information about each diagnostic code number is organized in this manual as follows:
• If a diagnostic code number has a corresponding fault code number, the information is shown in
“TROUBLESHOOTING DETAILS”. (Refer to “TROUBLESHOOTING DETAILS” on page 8-36.)
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