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 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 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...