Yamaha YZ 2019 Series, Owner'S Service Manual

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FUEL INJECTION SYSTEM
8-23
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YAMAHA DIAGNOSTIC TOOL
This model uses the Yamaha diagnostic tool to identify malfunctions.
For information about using the Yamaha diagnostic tool, refer to the operation manual that is included
with the tool.
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FEATURES OF THE YAMAHA DIAGNOSTIC TOOL
A diagnosis can be made more quickly than traditional methods with the Yamaha diagnostic tool.
Using this software, ECU and sensor data, as well as fault diagnosis, vehicle maintenance, and any
necessary information can be recorded and displayed on your computer screen through a USB adapter
connected to the computer interface with a communication cable connected to the vehicle’s ECU.
Data obtained in various functions can be saved as vehicle history, and can be accumulated.
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FUNCTIONS OF THE YAMAHA DIAGNOSTIC TOOL
However, the diagnostic tool cannot be used to freely change the basic vehicle functions, such as ad-
justing the ignition timing.
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CONNECTING THE YAMAHA DIAGNOSTIC TOOL
1. Remove the coupler for connecting setting tool.
Yamaha diagnostic tool USB (US)
90890-03257
Yamaha diagnostic tool (A/I)
90890-03262
Fault diagnosis mode
Fault codes recorded on the ECU are read, and the contents
are displayed.
Function diagnostic mode
Check the operation of the output value of each sensor and
actuator.
Inspection mode
Determine whether each sensor or actuator is functioning
properly.
CO adjustment mode Adjust the concentration of CO admissions during idling.
Monitoring mode
Displays a graph of sensor output values for actual operating
conditions.
Logging mode
Records and saves the sensor output value in actual driving
conditions.
View log Displays the logging data.
ECU rewrite
If necessary, the ECU is rewritten using the ECU rewrite data
provided by Yamaha. Ignition timing adjustment, etc. cannot be
changed from the vehicle’s original state.