Yamaha WR250R Service Manual page 314

Fault code No. 15
Diagnostic monitoring
code No.
Order Item/components and probable cause
1 Installed condition of throttle position sen-
sor.
2 Connected state of connector
Throttle position sensor coupler
G
Main wire harness ECU coupler
G
3 Open or short circuit in wire harness and/
or sub lead.
4 Throttle position sensor lead wire open
circuit output voltage check.
5 Defective throttle position sensor.
Symptom Throttle position sensor-open or short circuit detected.
01 Throttle position sensor
Check or maintenance job
G
G
G
G
G
G
G
(Black/Blue–Black/Blue)
(Yellow–Yellow)
(Blue–Blue)
G
(Black/Blue–Yellow)
Open circuit item Output voltage
Ground wire
open circuit
Output wire open
circuit
Power supply
wire open circuit
G
G
Refer
THROTTLE
SOR" on page 8-79.
8-43
FUEL INJECTION SYSTEM
Check the installed area for loose-
ness or pinching.
Check that is installed in the speci-
fied position.
Check the coupler for any pins that
may have pulled out.
Check the locking condition of the
coupler.
If there is a malfunction, repair it
and connect it securely.
Repair or replace if there is an
open or short circuit.
Between throttle position sensor
coupler and ECU coupler
Check for open circuit and replace
the throttle position sensor.
5 V
0 V
0 V
Execute the diagnostic monitoring
mode. (Code No.01)
Replace if defective.
to "CHECKING
POSITION
Reinstatement
method
Turning the main
switch ON.
THE
SEN-