Yamaha Wr250r 2008 Manual
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IGNITION SYSTEM 8-1 EAS27090 IGNITION SYSTEM EAS27100 CIRCUIT DIAGRAM
IGNITION SYSTEM 8-2 1. AC magneto 3. Main switch 4. Battery 5. Main fuse 8. Right handlebar switch 9. Engine stop switch 11. Relay unit 12. Sidestand switch 13. Neutral switch 14. Clutch switch 16. ECU 17. Ignition coil 18. Spark plug 27. Lean angle sensor 56. Ignition fuse
IGNITION SYSTEM 8-3 EAS27130 TROUBLESHOOTING The ignition system fails to operate (no spark or intermittent spark). NOTE: Before troubleshooting, remove the following part (s): 1. Seat 2. Side cover (left) 3. Air scoop (left/right) 4. Fuel tank 1. Check the fuses. (Main and ignition) 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. Check the spark plug. Refer to “CHECKING THE SPARK PLUG” on page 3-8 .NG → Re-gap or replace the spark plug. OK ↓ 4. Check the ignition spark gap. Refer to “CHECKING THE IGNITION SPARK GAP” on page 8-74 .OK → The ignition system is normal. NG ↓ 5. Check the ignition coil. Refer to “CHECKING THE IGNITION COIL” on page 8-74 .NG → Replace the ignition coil. OK ↓ 6. Check the crankshaft position sen- sor. Refer to “CHECKING THE CRANK- SHAFT POSITION SENSOR” on page 8-75 .NG → Replace the stater assembly. OK ↓ 7. Check the main switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the main switch. OK ↓ 8. Check the engine stop switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the right handlebar switch. OK ↓ 9. Check the neutral switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the neutral switch. OK ↓
IGNITION SYSTEM 8-4 10.Check the sidestand switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the sidestand switch. OK ↓ 11.Check the clutch switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the clutch switch. OK ↓ 12.Check the relay unit. Refer to “CHECKING THE RELAYS” on page 8-71 .NG → Replace the relay unit. OK ↓ 13.Check the diode. Refer to “CHECKING THE DIODE” on page 8-73 .NG → Replace the relay unit. OK ↓ 14.Check the lean angle sensor. Refer to “CHECKING THE LEAN ANGLE SENSOR” on page 8-75 .NG → Replace the lean angle sensor. OK ↓ 15.Check the entire ignition system ’ s wiring. Refer to “CIRCUIT DIAGRAM” on page 8-1 .NG → Properly connect or repair the ignition system ’ s wiring. OK ↓ Replace the ECU.
ELECTRIC STARTING SYSTEM 8-5 EAS27160 ELECTRIC STARTING SYSTEM EAS27170 CIRCUIT DIAGRAM
ELECTRIC STARTING SYSTEM 8-6 3. Main switch 4. Battery 5. Main fuse 6. Starter relay 7. Starter motor 8. Right handlebar switch 9. Engine stop switch 10. Start switch 11. Relay unit 12. Sidestand switch 13. Neutral switch 14. Clutch switch 55. Signaling system fuse 56. Ignition fuse
ELECTRIC STARTING SYSTEM 8-7 EAS27180 STARTING CIRCUIT CUT-OFF SYSTEM OPERATION If the engine stop switch is set to “ ” and the main switch is set to “ON” (both switches are closed), the starter motor can only operate if at least one of the following conditions is met: The transmission is in neutral (the neutral switch is closed). The clutch lever is pulled to the handlebar (the clutch switch is closed) and the sidestand is up (the sidestand switch is closed). The starting circuit cut-off relay prevents the starter motor from operating when neither of these condi- tions has been met. In this instance, the starting circuit cut-off relay is open so current cannot reach the starter motor. When at least one of the above conditions has been met the starting circuit cut-off relay is closed and the engine can be started by pressing the starter switch. 15 1 14 2 3 4 5 613 9 10 1112 a b 7 9 9 8
ELECTRIC STARTING SYSTEM 8-8 a. WHEN THE TRANSMISSION IS IN NEU- TRAL b. WHEN THE SIDESTAND IS UP AND THE CLUTCH LEVER IS PULLED TO THE HANDLEBAR 1. Battery 2. Main fuse 3. Main switch 4. Ignition fuse 5. Engine stop switch 6. Starting circuit cut-off relay 7. Signal fuse 8. Diode 9. Diode 10. Clutch switch 11. Sidestand switch 12. Neutral switch 13. Start switch 14. Starter relay 15. Starter motor
ELECTRIC STARTING SYSTEM 8-9 EAS27190 TROUBLESHOOTING The starter motor fails to turn. NOTE: Before troubleshooting, remove the following part (s): 1. Seat 2. Side cover (left) 3. Air scoop (left/right) 4. Fuel tank 1. Check the fuses. (Main, ignition and signal 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. Replace the starter motor. Refer to “CHECKING THE STARTER MOTOR” on page 5-32 .NG → Repair or replace the starter motor. OK ↓ 4. Check the relay unit. Refer to “CHECKING THE RELAYS” on page 8-71 .NG → Replace the relay unit. OK ↓ 5. Check the diode. Refer to “CHECKING THE DIODE” on page 8-73 .NG → Replace the relay unit. OK ↓ 6. Check the starter relay. Refer to “CHECKING THE RELAYS” on page 8-71 .NG → Replace the starter relay. OK ↓ 7. Check the main switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the main switch. OK ↓ 8. Check the engine stop switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the right handlebar switch. OK ↓ 9. Check the neutral switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the neutral switch. OK ↓ 10.Check the sidestand switch. Refer to “CHECKING THE SWITCHES” on page 8-63 .NG → Replace the sidestand switch.