Troubleshootin Gmethod - Yamaha WR450FB 2012 Owner's Service Manual

EAS27400
TROUBLESHOOTING METHOD
The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
• Fault code number
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a. Check the fault code number displayed on
the meter.
b. Identify the faulty system with the fault code
number.
c. Identify the probable cause of the malfunc-
tion.
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2. Check and repair the probable cause of the
malfunction.
Fault code No. No fault code No.
Check and repair. Re- Check and repair.
fer to "TROUBLE-
SHOOTING
DETAILS" on page 9-
33.
Monitor the operation
of the sensors and
actuators in the diag-
nostic mode. Refer
to''TROUBLE-
SHOOTING DE-
TAILS" on page 9-33
and "LIST OF DIAG-
NOSTIC CODES" on
page 9-31.
3. Perform the reinstatement action for the fuel
injection system.
Refer to "Reinstatement method" in the ap-
propriate table in ''TROUBLESHOOTING
DETAILS" on page 8-36.
4. Set the main switch to "OFF", then to "ON"
again, and then check that no fault code
number is displayed.
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _
If another fault code number is displayed, re-
peat steps (1) to (4) until no fault code number
is displayed.
5. Erase the malfunction history in the diagnos-
tic mode. Refer to"LIST OF DIAGNOSTIC
CODES"(Diagnostic code No.d:62).
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _
Setting the main switch to "OFF" will not erase
the malfunction history.
FUEL INJECTION SYSTEM
The engine operation is not normal, but the
engine trouble warning light does not come
.. on.
9-29
1. Check the operation of the following sensors
and actuators in the diagnostic mode. Refer
to ''TROUBLESHOOTING DETAILS" on
page 8-36.
d:01: Throttle position sensor signal (throttle
angle)
d:30: Ignition coil
d:36: Injector
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.