Yamaha YZFR1W 2007 Service Manual page 322

EAS27150
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
• Before troubleshooting, remove the following part(s):
1 Rider seat
2 Passenger seat
3 Fuel tank
4 Side cowlings
1 Check the fuses.
(Main and ignition)
Refer to "CHECKING THE FUSES"
on page 8-85.
OK↓
2 Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-85.
OK↓
3 Check the spark plugs.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-9.
OK↓
4 Check the ignition spark gap.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-91.
OK↓
5 Check the ignition coils.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-91.
OK↓
6 Check the crankshaft position sen-
sor.
Refer to "CHECKING THE
CRANKSHAFT POSITION SEN-
SOR" on page 8-92.
OK↓
7 Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 8-81.
OK↓
NG→
Replace the fuse(s).
NG→
• Clean the battery terminals.
• Recharge or replace the battery.
NG→
Re-gap or replace the spark plugs.
NG→
Ignition system is OK.
NG→
Replace the ignition coils.
NG→
Replace the crankshaft position sen-
sor.
NG→
Replace the main switch/immobilizer
unit assembly.
8-3
IGNITION SYSTEM