Yamaha YZF-R1 Series Service Manual page 439

EAS30492
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
TIP
• Before troubleshooting, remove the following part(s):
1. Front side cowling/Front panel
2. Rider seat
3. Fuel tank cover
4. Fuel tank
5. Air filter case
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 spark plugs.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-5.
OK ↓
4. Check the ignition spark gap.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-5.
NG ↓
5. Check the ignition coils.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-44.
OK ↓
6. Check the crankshaft position sen-
sor.
Refer to "CHECKING THE CRANK-
SHAFT POSITION SENSOR" on
page 8-45.
OK ↓
7. Check the cylinder identification
sensor.
Refer to "CHECKING THE CYLIN-
DER IDENTIFICATION SENSOR"
on page 8-50.
OK ↓
NG →
Replace the fuse(s).
NG →
• Clean the battery terminals.
• Recharge or replace the battery.
NG →
Re-gap or replace the spark plug(s).
OK →
Ignition system is OK.
NG →
Replace the ignition coil(s).
NG →
Replace the crankshaft position sensor.
NG →
Replace the cylinder identification sensor.
8-4
IGNITION SYSTEM