Yamaha WR250R Service Manual page 316

Fault code No. 18
Diagnostic monitoring
code No.
Order Item/components and probable cause
1 Connected state of connector.
G EXUP servo motor coupler
Wire harness ECU coupler
G
2 Open or short circuit in wire harness.
3 Defective EXUP servo motor
4 Defective EXUP valve, pully and cable.
Fault code No. 19
Diagnostic monitoring
code No.
Order Item/components and probable cause
1 Connected state of connector
Main wire harness ECU coupler
G
2 Open or short circuit in wire harness.
3 Defective sidestand switch.
Symptom EXUP servo motor is stuck.
53 EXUP servo motor
Check or maintenance job
G
G
G
G
G
(Black/Red–Black/Red)
(Black/Green–Black/Green)
G
G
G
Open circuit is detected in the input line from the sidestand
Symptom
switch to the ECU.
20 Sidestand switch
Check or maintenance job
G
G
G
G
G
G
(Blue/Yellow–Blue/Yellow)
G
(Blue/Black–Blue/Black)
G
Refer
SWITCHES" on page 8-63.
8-45
FUEL INJECTION SYSTEM
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 EXUP servo motor cou-
pler and ECU coupler
Execute the diagnostic monitoring
mode. (Code No.53)
Replace if defective.
Replace if defective.
Execute the diagnostic monitoring
mode. (Code No.20)
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 relay unit and main
switch coupler.
Between ECU and main switch
coupler.
Replace if defective.
to "CHECKING
Reinstatement
method
Turn the main
switch to "ON".
Reinstatement
method
If the transmis-
sion is in gear,
retracting the
sidestand.
If the transmis-
sion is in neutral,
reconnecting the
wiring.
THE