Yamaha WR250FM 2021 Owner's Service Manual page 337

Fault code No. 14
TIP
If fault code numbers 13 and 14 are both displayed, perform checkup and repair jobs for fault code num-
ber 13 first.
Fault code No.
Item
Fail-safe system
Diagnostic code No.
Diagnostic tool display
Procedure
Probable cause of malfunc-
Item
tion and check
1 The intake air pressure sensor
hose is damaged, discon-
nected, clogged, twisted or
bent.
2 Defective intake air pressure
sensor.
3 Delete the fault code.
14
Intake air pressure sensor: hose system malfunction (clogged or
detached hose).
Able to start engine
Able to drive vehicle
03
Displays the intake air pressure.
The atmospheric pressure is displayed on the Yamaha diagnostic tool.
Maintenance job
Repair or replace the sensor
hose.
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)
Value does not change during
cranking  Intake air pressure
sensor replacement.
Confirm that the fault code has
a condition of "Recovered"
using the Yamaha diagnostic
tool, and then delete the fault
code.
8-36
FUEL INJECTION SYSTEM
Confirmation of service com-
pletion
Start the engine and let it idle for
approximately 5 seconds (fully
close the throttle valve).
Check the condition of the fault
code using the malfunction
mode of the Yamaha diagnostic
tool.
Condition is "Recovered"  Go
to item 3 and finish the service.
Condition is "Detected"  Go to
item 2.
Service is finished.