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The engine operation is not normal, but the engine trouble warning light does not come on.
1. Check the operation of the following sensors and actuators in the diagnostic mode. Refer to "DIAG-
NOSTIC CODE: SENSOR OPERATION TABLE" on page 9-8 and "DIAGNOSTIC CODE: ACTUA-
TOR OPERATION TABLE" on page 9-10.
01: Throttle position sensor signal (throttle angle)
30: Cylinder-#1 ignition coil
31: Cylinder-#2 ignition coil
36: Fuel injector #1
37: Fuel injector #2
If a malfunction is detected in the sensors or actuators, repair or replace all faulty parts.
If no malfunction is detected in the sensors and actuators, check and repair the inner parts of the
engine.
EAS30951
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.
Yamaha diagnostic tool USB
90890-03267
Yamaha diagnostic tool (A/I)
90890-03262
TIP
A generic scan tool can also be used to identify malfunctions.
OBD/ GST Leadwire kit
90890-03249
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 9-1.
FUEL INJECTION SYSTEM
1
8-34
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Troubleshooting
