Yamaha WR250F 2016 Owner's Service Manual page 377

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Fault code No.
Item
2
Installed condition of lean an-
gle sensor.
3
Defective lean angle sensor.
4
Malfunction in ECU.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Actuation
Procedure
Probable cause of malfunc-
Item
tion and check
1
Connection of ignition coil
coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
2
Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler and
check the pins (bent or bro-
ken terminals and locking
condition of the pins).
30
Latch up detected.
Check the installed direction
and condition of the sensor.
Execute the diagnostic mode.
(Code No. 08)
Replace if defective.
Refer to "CHECKING THE
LEAN ANGLE SENSOR" on
page 9-75.
Replace the ECU.
33
Ignition coil: open or short circuit detected in the primary lead
of the ignition coil.
Unable to start engine
Unable to drive vehicle
30
Actuates the ignition coil five times at one-second intervals.
The engine trouble warning light and the "WARNING" on the
Yamaha diagnostic tool screen come on each time the ignition coil
is actuated.
Check that a spark is generated five times.
• Connect an ignition checker.
Maintenance job
Improperly connected 
Connect the coupler securely
or repair/replace the wire har-
ness.
Improperly connected 
Connect the coupler securely
or repair/replace the wire har-
ness.
9-45
FUEL INJECTION SYSTEM
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 3.
Push the start switch.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 4.
Confirmation of service
completion
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 2.
Start the engine and let it idle
for approximately 5 seconds.
Fault code number is not dis-
played  Service is finished.
Fault code number is dis-
played  Go to item 3.

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