Troubleshooting Details (Fault Code); Troubleshooting - Yamaha MTN850-A 2017 Service Manual

Functions of the Yamaha diagnostic tool
Diagnosis of malfunction:
Diagnosis of function:
Dynamic inspection:
Active test:
Maintenance record:
Recall search:
Monitoring:
Logging:
CO adjustment:
Reprogram ECU:
Writing VIN/frame number:
View logs:
However, the Yamaha diagnostic tool cannot be used to freely change the basic vehicle functions, such
as adjusting the ignition timing.
Connecting the Yamaha diagnostic tool
Remove the protective cap "1", and then connect the Yamaha diagnostic tool to the coupler.
EAS31791

TROUBLESHOOTING DETAILS (FAULT CODE)

This section describes the measures per fault code number displayed on the Yamaha diagnostic tool.
Check and service the items or components that are the probable cause of the malfunction following
the order given.
After the check and service of the malfunctioning part have been completed, delete the fault codes dis-
played on the Yamaha diagnostic tool according to the reinstatement method.
Fault code No.:
Fault code number displayed on the Yamaha diagnostic tool when the engine failed to work normally.
Diagnostic code No.:
Diagnostic code number to be used when the diagnostic mode is operated. Refer to "SELF-DIAGNOS-
TIC FUNCTION AND DIAGNOSTIC CODE TABLE" on page 9-5.
Fault codes recorded on the ECU are read, and the contents are dis-
played.
The freeze frame data (FFD) is the operation data when a malfunction
was detected. This data can be used to identify when the malfunction
occurred and check the engine conditions and running conditions when
it occurred.
Check the operation of the output value of each sensor and actuator.
Check the electric component condition automatically.
Manually adjust injection duration and/or switch some actuators for

troubleshooting.

Store the inspection history into the Yamaha diagnostic tool application.
Search the recall campaign information.
Displays a graph of sensor output values for actual operating condi-
tions.
Records and saves the sensor output value in actual driving conditions.
Adjust the concentration of CO admissions during idling.
If necessary, the ECU is rewritten using ECU rewrite data provided by
Yamaha.
Ignition timing adjustment, etc. cannot be changed from the vehicle's
original state.
Write the VIN/frame number in the ECU.
Displays the logging data.
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8-37
FUEL INJECTION SYSTEM