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Yamaha Wr250r 2008 Manual

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Page 331

 
ELECTRICAL COMPONENTS 
8-60 
1. Main switch
2. Battery
3. Main fuse
4. Starter relay
5. ECU
6.  Lean angle sensor
7. Intake solenoid
8.  Throttle position sensor
9. Sidestand switch
10. Neutral switch
11. Rear brake switch
12. Fan motor
13. Rectifier/regulator 

Page 332

 
ELECTRICAL COMPONENTS 
8-61
23
4
9
5
10
14
13
16
7
11
12
15
8 

Page 333

 
ELECTRICAL COMPONENTS 
8-62 
1. Horn
2. Fuse box
3. Starter motor
4.  Radiator fan motor relay
5.  Turn signal relay
6. Relay assembly
7. Headlight relay
8.  Intake air temperature sensor
9.  Coolant temperature sensor
10. Speed sensor
11. EXUP servo motor
12. Injector
13. Ignition coil
14. Fuel pump
15. Air cut-off valve 

Page 334

 
ELECTRICAL COMPONENTS 
8-63 
EAS27980 
CHECKING THE SWITCHES
7
98
1110 4 2
3
5
61 

Page 335

 
ELECTRICAL COMPONENTS 
8-64 
1. Horn switch
2. Dimmer switch
3.  Turn signal switch
4. Clutch switch
5. Neutral switch
6. Sidestand switch
7. Main switch
8.  Engine stop switch
9. Start switch
10.  Front brake switch
11.  Rear brake switch 

Page 336

 
ELECTRICAL COMPONENTS 
8-65 
Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, check the
wiring connections and if necessary, replace the switch.
CAUTION:
 
 ECA14370 
Never insert the tester probes into the coupler terminal slots “1”. Always insert the probes from 
the opposite end of the coupler, taking care not to loosen or damage the leads.
NOTE:
 
 
Before checking for continuity, set the pocket tester to “0” and to the “  
Ω  
   
×  
 1” range. 
...

Page 337

 
ELECTRICAL COMPONENTS 
8-66 
EAS27990 
CHECKING THE BULBS AND BULB 
SOCKETS 
Check each bulb and bulb socket for damage or
wear, proper connections, and also for continu-
ity between the terminals.
Damage/wear  
→ 
 Repair or replace the bulb,
bulb socket or both.
Improperly connected  
→ 
 Properly connect.
No continuity  
→ 
 Repair or replace the bulb, bulb
socket or both. 
Types of bulbs 
The bulbs used on this vehicle are shown in the
illustration on the left. 
 
Bulbs “a” and “b” are used for...

Page 338

 
ELECTRICAL COMPONENTS 
8-67 
Checking the condition of the bulb sockets 
The following procedure applies to all of the bulb
sockets.
1. Check: 
 
Bulb socket (for continuity)
(with the pocket tester)
No continuity  
→ 
 Replace.
NOTE:
 
Check each bulb socket for continuity in the
same manner as described in the bulb section; 
however, note the following.

 
a. Install a good bulb into the bulb socket.
b. Connect the pocket tester probes to the re-
spective leads of the...

Page 339

 
ELECTRICAL COMPONENTS 
8-68
WARNING
 
EWA13310  
Never use a fuse with an amperage rating
other than that specified. Improvising or us-
ing a fuse with the wrong amperage rating
may cause extensive damage to the electri-
cal system, cause the lighting and ignition
systems to malfunction and could possibly 
cause a fire.

 
4. Install: 
 
Air scoop (left) 
 
Side cover (left)
Refer to “GENERAL CHASSIS” on page 4-1. 
EAS28030 
CHECKING AND CHARGING THE BATTERY
WARNING...

Page 340

 
ELECTRICAL COMPONENTS 
8-69 
3. Remove: 
 
Battery
4. Check: 
 
Battery charge

 
a. Connect a pocket tester to the battery termi-
nals.
NOTE:
 
 
The charge state of an MF battery can be
checked by measuring its open-circuit voltage
(i.e., the voltage when the positive battery ter-
minal is disconnected). 
 
No charging is necessary when the open-cir- 
cuit voltage equals or exceeds 12.8 V.
b. Check the charge of the battery, as shown in
the charts and the following...
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