Yamaha WR250F 2021 - Page 336

FUEL INJECTION SYSTEM
8-35
1 Connection of intake air pres-
sure sensor coupler.
Check the locking condition of
the coupler.
Disconnect the coupler, and
check the pins (for bent or bro-
ken terminals and locking condi-
tion of the pins).
Improperly connected  Con-
nect the coupler securely, or
repair/replace the wire harness.
Push the start switch (main
relay ON), and then check the
condition of the fault code using
the malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”  Go
to item 7 and finish the service.
Condition is “Detected”  Go to
item 2.
2 Connection of wire harness
ECU coupler.
Check the locking condition of
the coupler.
Disconnect the coupler, and
check the pins (for bent or bro-
ken terminals and locking condi-
tion of the pins).
Improperly connected  Con-
nect the coupler securely, or
repair/replace the wire harness.
Push the start switch (main
relay ON), and then check the
condition of the fault code using
the malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”  Go
to item 7 and finish the service.
Condition is “Detected”  Go to
item 3.
3 Wire harness continuity. Open or short circuit  Replace
the wire harness.
Between intake air pressure
sensor coupler and ECU cou-
pler.
pink–pink
blue–blue
black/blue–black/blue
Push the start switch (main
relay ON), and then check the
condition of the fault code using
the malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”  Go
to item 7 and finish the service.
Condition is “Detected”  Go to
item 4.
4 Mounted condition of intake air
pressure sensor.
Check for looseness or pinch-
ing.
Check the mounted position for
correctness.
Improperly mounted sensor 
Remount or replace the sensor.
Push the start switch (main
relay ON), and then check the
condition of the fault code using
the malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”  Go
to item 7 and finish the service.
Condition is “Detected”  Go to
item 5.
5 Defective intake air pressure
sensor.
Execute the diagnostic mode.
(Code No. 03)
Atmospheric pressure at the
current altitude and weather
conditions is indicated.
0 m above sea level: About 101
kPa (about 3.63 V)
1000 m above sea level: About
90 kPa (about 3.30 V)
2000 m above sea level: About
80 kPa (about 3.00 V)
3000 m above sea level: About
70 kPa (about 2.70 V)
Abnormal display  Intake air
pressure sensor is defective 
Replace the intake air pressure
sensor.
Push the start switch (main
relay ON), and then check the
con
dition of the fault code using
the malfunction mode of the
Yamaha diagnostic tool.
Condition is “Recovered”  Go
to item 7 and finish the service.
Condition is “Detected”  Go to
item 6.
6 Faulty ECU. Replace the ECU. Service is finished.
7 Delete the fault code. Confirm that the fault code has
a condition of “Recovered”
using the Yamaha diagnostic
tool, and then delete the fault
code.
Fault code No. 13
Item Intake air pressure sensor: open or short circuit detected.