Yamaha YZF-R25 Service Manual page 349

8. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
9. Check the engine stop switch.
Refer to "CHECKING THE
SWITCHES" on page 8-77.
OK ↓
10.Check the diodes (Diode 1 and 3).
Refer to "CHECKING THE DI-
ODES" on page 8-86.
OK ↓
11.Check the lean angle sensor.
Refer to "CHECKING THE LEAN
ANGLE SENSOR" on page 8-89.
OK ↓
12.Check the entire ignition system
wiring.
Refer to "CIRCUIT DIAGRAM" on
page 8-1.
OK ↓
Replace the ECU. Refer to "REPLAC-
ING THE ECU (engine control unit)"
on page 8-81.
NG →
Replace the main switch.
NG →
• The engine stop switch is faulty.
• Replace the right handlebar switch.
NG →
Replace the diode(s).
NG →
Replace the lean angle sensor.
NG →
Properly connect or replace the wiring har-
ness.
8-4
IGNITION SYSTEM