Yamaha YZF-R15, Service Manual

Page: 261 / 338

8-4 8-3
IGNITION SYSTEM IGNITION SYSTEM
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
• Before troubleshooting, remove the following part(s):
1. Seat
2. Fuel tank
3. Right front panel
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
OK →
NG ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
1. Check the fuse.
Refer to “CHECKING THE FUSE”
on page 8-61. Replace the fuse.
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY ” on
page 8-61. • Clean the battery terminals.
• Recharge or replace the battery.
3. Check the spark plug.
Refer to “CHECKING THE SPARK
PLUG” on page 3-7. Re-gap or replace the spark plug.
4. Check the ignition spark gap.
Refer to “CHECKING THE IGNI-
TION SPARK GAP” on page 8-67. Ignition system is OK.
5. Check the spark plug cap.
Refer to “CHECKING THE SPARK
PLUG CAP” on page 8-66. Replace the spark plug cap.
6. Check the ignition coil.
Refer to “CHECKING THE IGNI-
TION COIL” on page 8-67. Replace the ignition coil.
7. Check the crankshaft position sen-
sor.
Refer to “CHECKING THE CRANK-
SHAFT POSITION SENSOR” on
page 8-68.
Replace the crankshaft position sen-
sor/stator assembly.
8. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57. Replace the main switch.
NG →
OK ↓
NG →
OK ↓
NG →
OK ↓
9. Check the engine stop switch.
Refer to “CHECKING THE
SWITCHES” on page 8-57.
The engine stop switch is faulty. Replace
the right handlebar switch.
10.Check the lean angle sensor.
Refer to “CHECKING THE LEAN
ANGLE SENSOR” on page 8-68. Replace the lean angle sensor.
11.Check the entire ignition system
wiring.
Refer to “CIRCUIT DIAGRAM” on
page 8-1. Properly connect or repair the ignition sys-
tem wiring.
Replace the ECU.