Yamaha YZF-R1 Series Service Manual page 445

EAS30495
TROUBLESHOOTING
The starter motor fails to turn.
TIP
• Before troubleshooting, remove the following part(s):
1. Front side cowling/Front panel/Side cover
2. Rider seat
3. Fuel tank cover
4. Fuel tank
5. Air filter case
6. Throttle bodies
1. Check the fuses.
(Main, ignition and backup)
Refer to "CHECKING THE FUS-
ES" on page 8-41.
OK ↓
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-42.
OK ↓
3. Check the starter motor operation.
Refer to "CHECKING THE START-
ER MOTOR OPERATION" on page
8-46.
NG ↓
4. Check the starter motor.
Refer to "CHECKING THE START-
ER MOTOR" on page 5-52.
OK ↓
5. Check the relay unit (starting circuit
cut-off relay).
Refer to "CHECKING THE RE-
LAYS" on page 8-42.
OK ↓
6. Check the relay unit (diode).
Refer to "CHECKING THE RELAY
UNIT (DIODE)" on page 8-43.
OK ↓
7. Check the starter relay.
Refer to "CHECKING THE RE-
LAYS" on page 8-42.
OK ↓
ELECTRIC STARTING SYSTEM
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
OK →
Starter motor is OK. Perform the electric
starting system troubleshooting, starting
with step (5).
NG →
Repair or replace the starter motor.
NG →
Replace the relay unit.
NG →
Replace the relay unit.
NG →
Replace the starter relay.
8-10