Yamaha Wr250r 2008 Manual

 
FUEL INJECTION SYSTEM 
8-40 
49 Intake solenoidActuates the intake solenoid for 
five times every second.
Illuminates the engine trouble 
warning light.Check the operating sound of 
the solenoid five times.
50 Fuel injection system relayActuates the fuel injection sys-
tem relay for five times every 
second.
Illuminates the engine trouble 
warning light.
(The engine trouble warning 
light is OFF when the relay is 
ON, and the engine trouble 
warning light is ON when the 
relay is OFF).Check the operating...

 
FUEL INJECTION SYSTEM 
8-41 
EAS27480 
TROUBLESHOOTING DETAILS 
This section describes the measures per fault code number displayed on the meter. Carry out check
and maintenance on items or components that could be a cause of malfunction in accordance with the
order.
When the check and maintenance of malfunctioned part is completed, restore the meter display ac-
cording to the “Reinstatement method”.
Fault code No.:
Fault code number displayed on the meter when the engine failed to work normally. Refer...

 
FUEL INJECTION SYSTEM 
8-42 
Fault code No. 13 Symptom Intake air pressure sensor-open or short circuit detected.
Diagnostic monitoring 
code No.03 Intake air pressure sensor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
Intake air pressure sensor coupler 
 
Main wire harness ECU coupler 
 
Check the coupler for any pins that 
may have pulled out. 
 
Check the locking condition of the 
coupler. 
 
If there is a...

 
FUEL INJECTION SYSTEM 
8-43 
Fault code No. 15 Symptom Throttle position sensor-open or short circuit detected.
Diagnostic monitoring 
code No.01 Throttle position sensor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Installed condition of throttle position sen-
sor.
 
 
Check the installed area for loose-
ness or pinching. 
 
Check that is installed in the speci-
fied position.Turning the main 
switch ON.
2 Connected state of connector 
 
Throttle position...

 
FUEL INJECTION SYSTEM 
8-44 
Fault code No. 16 Symptom Stuck throttle position sensor detected.
Diagnostic monitoring 
code No.01 Throttle position sensor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Installed condition of throttle position sen-
sor.
 
 
Check the installed area for loose-
ness or pinching. 
 
Check that is installed in the speci-
fied position.Reinstated by 
starting the 
engine, operating 
it at idle.
And then racing 
it.
2 Defective...

 
FUEL INJECTION SYSTEM 
8-45 
Fault code No. 18 Symptom EXUP servo motor is stuck.
Diagnostic monitoring 
code No.53 EXUP servo motor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector.
 
 
EXUP servo motor coupler 
 
Wire harness ECU coupler 
 
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.Turn the main...

 
FUEL INJECTION SYSTEM 
8-46 
Fault code No. 21 Symptom Coolant temperature sensor-open or short circuit detected.
Diagnostic monitoring 
code No.06 Coolant temperature sensor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Installed condition of coolant temperature 
sensor.
 
 
Check the installed area for loose-
ness or pinching.Turning the main 
switch ON.
2 Connected state of connector 
 
Coolant temperature sensor coupler 
 
Main wire harness ECU coupler...

 
FUEL INJECTION SYSTEM 
8-47 
Fault code No. 22 Symptom Intake air temperature sensor-open or short circuit detected.
Diagnostic monitoring 
code No.05 Intake air temperature sensor
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Installed condition of intake air tempera-
ture sensor.
 
 
Check the installed area for loose-
ness or pinching.Turning the main 
switch ON.
2 Connected state of connector 
 
Intake air temperature sensor coupler 
 
Main wire...

 
FUEL INJECTION SYSTEM 
8-48 
Fault code No. 33 Symptom Malfunction detected in the primary wire of the ignition coil.
Diagnostic monitoring 
code No.30 Ignition coil
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
Ignition coil primary side coupler 
(Orange) 
 
Main wire harness ECU coupler 
 
Check the coupler for any pins that 
may have pulled out. 
 
Check the locking condition of the 
coupler. 
 
If there is a...

 
FUEL INJECTION SYSTEM 
8-49 
Fault code No. 42 SymptomA. No normal signals are received from the speed sensor.
B. Open or short circuit is detected in the neutral switch.
Diagnostic monitoring 
code No.A 07 Speed sensor
B 21 Neutral switch
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
A-1 Installed condition of speed sensor
 
 
Check the installed area for loose-
ness or pinching.Starting the 
engine, and 
inputting the 
vehicle speed 
signals by oper-
ating...