Yamaha Wr250r 2008 Manual

 
FUEL INJECTION SYSTEM 
8-50 
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  
B-1 Installed condition of neutral switch
 
 
Check the installed area for loose-
ness or pinching.Turn the main 
switch to “ON”.
B-2 Connected state of connector. 
 
Neutral...

 
FUEL INJECTION SYSTEM 
8-51 
Fault code No. 43 Symptom Supply power to the fuel injector and fuel pump is not normal.
Diagnostic monitoring 
code No.09 Fuel system voltage
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
Relay unit coupler 
 
Fuel pump coupler 
 
Fuel injector coupler 
 
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 
8-52 
Fault code No. 46 Symptom Power supply to the FI system relay is not normal.
Diagnostic monitoring 
code No.——
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
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.Starting the 
engine and oper-
ating it...

 
FUEL INJECTION SYSTEM 
8-53 
Fault code No. Er-1 Symptom No signals are received from the ECU.
Diagnostic monitoring 
code No.——
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
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 malfunction, repair it 
and connect it securely.Reinstated if nor-
mal signal is 
received from...

 
FUEL INJECTION SYSTEM 
8-54 
Fault code No. Er-3 Symptom Data from the ECU cannot be received correctly.
Diagnostic monitoring 
code No.——
OrderItem/components and probable cause Check or maintenance jobReinstatement 
method  
1 Connected state of connector
 
 
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 malfunction, repair it 
and connect it securely.Reinstated if nor-
mal signal is...

 
FUEL PUMP SYSTEM 
8-55 
EAS27580 
FUEL PUMP SYSTEM 
EAS27590 
CIRCUIT DIAGRAM 

 
FUEL PUMP SYSTEM 
8-56 
3. Main switch
4. Battery
5. Main fuse
8.  Right handlebar switch
9.  Engine stop switch
11. Relay unit
15. Fuel pump
16. ECU
56. Ignition fuse
58. EFI fuse 

 
FUEL PUMP SYSTEM 
8-57 
EAS27600 
TROUBLE SHOOTING 
The fuel pump fails to operate.
NOTE:
 
Before troubleshooting, remove the following part(s):
1. Seat
2. Side cover (left/right) 
3. Fuel tank
1. Check the fuse
(Main fuse, ignition fuse, EFI fuse)
Refer to  
“CHECKING THE FUSES” on 
page 8-67 
.NG 
→ 
Replace the fuse(s).
OK 
↓ 
2. Check the battery.
Refer to  
“CHECKING AND CHARG-
ING THE BATTERY” on page 8-68 
.NG 
→ 
 
Clean the battery terminals. 
 
Recharge or replace the battery.
OK 
↓ 
3....

 
FUEL PUMP SYSTEM 
8-58 

 
ELECTRICAL COMPONENTS 
8-59 
EAS27971 
ELECTRICAL COMPONENTS 
EAS32D1011
2
3
4
7
5
8
10
12
1
11
6
9
13