Troubleshooting - Yamaha FZ 25 2021 Supplementary Service Manual

TROUBLESHOOTING

The ignition system fails to operate (no spark or intermittent spark).
TIP
• Before troubleshooting, remove the following part(s):
1. Passenger and rider seat
2. Left side cover and right side cover
3. Fuel tank panels
4. Remove headlight assembly
1. Check the fuse.
Refer to "CHECKING THE FUSES"
on page 6-106.
OK
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" in base
service manual B97-F8197-E0 on
page 7-62.
OK
3. Check the spark plug.
Refer to "CHECKING THE SPARK
PLUG" in base service manual B97-
F8197-E0 on page 3-8.
OK
4. Check the spark gap.
Refer to "CHECKING THE
IGNITION SPARK GAP" in base
service manual B97-F8197-E0 on
page 7-67.
NG
5. Check the ignition coil.
Refer to"CHECKING THE
IGNITION COIL" in base service
manual B97-F8197-E0 on page
7-66.
OK
6. Check the crankshaft position
sensor.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" in base service manual
B97-F8197-E0 on page 7-67.
OK
7. Check the main switch.
Refer to "CHECKING THE
SWITCHES" on page 6-105.
OK
IGNITION SYSTEM
NG
Replace the fuse.
NG
• Clean the battery terminals.
• Recharge or replace the battery.
NG
Re-gap or replace the spark plug.
OK
Ignition system is OK.
NG
Replace the ignition coil.
NG
Replace the crankshaft position
sensor/stator assembly.
NG
Replace the main switch.
6-3
ELEC
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