Yamaha FZ1-N Service Manual page 357

EAS27370
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
• Before troubleshooting, remove the following part(s):
1 Rider and passenger seat
2 Fuel tank
3 Air filter case
1 Check the fuses.
(Main, backup, fuel injection and
ignition)
Refer to "CHECKING THE FUSES"
on page 8-97.
OK↓
2 Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-97.
OK↓
3 Check the spark plugs.
Refer to "CHECKING THE SPARK
PLUGS" on page 3-10.
OK↓
4 Check the ignition coils.
Refer to "CHECKING THE IGNI-
TION COILS" on page 8-103.
OK↓
5 Check the crankshaft position sen-
sor.
Refer to "CHECKING THE
CRANKSHAFT POSITION SEN-
SOR" on page 8-104.
OK↓
6 Check the relay unit (fuel pump
relay).
Refer to "CHECKING THE
RELAYS" on page 8-100.
OK↓
7 Check the fuel pump.
Refer to "CHECKING THE
SWITCHES" on page 8-93.
OK↓
FUEL INJECTION SYSTEM
NG→
Replace the fuse(s).
NG→
• Clean the battery terminals.
• Recharge or replace the battery.
NG→
Re-gap or replace the spark plugs.
NG→
Replace the ignition coils.
NG→
Replace the crankshaft position sen-
sor.
NG→
Replace the relay unit.
NG→
Replace the fuel pump.
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