Yamaha WR250F 2016, Owner'S Service Manual

Page: 378 / 428

FUEL INJECTION SYSTEM
9-46
3 Connection of sub wire har-
ness coupler.Check the lock-
ing condition of the
coupler.Disconnect the cou-
pler and check the pins (bent
or broken terminals and lock-
ing condition of the pins).
Improperly connected

Connect the coupler secure-
lyor repair/replace the sub
wire harness.
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 4.
4 Wire harness continuity. Open or short circuit

Re-
place the wire harness.
Between ignition coil coupler
and ECU coupler.
orange–orange
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 5.
5 Installed condition of ignition
coil.
Check for looseness or
pinching.
Improperly installed sensor

Reinstall or replace the
sensor.
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 6.
6 Defective ignition coil. (test
the primary coils for continu-
ity)
Check the ignition coil.
Replace if defective.
Refer to “CHECKING THE
IGNITION COIL” on page 9-
74.
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 7.
7 Malfunction in ECU. Execute the diagnostic mode
(diagnostic code No. 30).
No spark

Replace the
ECU.
Fault code No. 33
Item
Ignition coil: open or short circuit detected in the primary lead
of the ignition coil.