Yamaha MT-03 Service Manual page 330

EAS27150
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
NOTE:
• Before troubleshooting, remove the following part(s):
1. Seats
2. Side panels (left and right)
3. Fuel tank
4. Battery cover
1. Check the fuses.
(Main and ignition)
Refer to "CHECKING THE FUSES"
on page 8-48.
OK
2. Check the battery.
Refer to "CHECKING AND
CHARGING THE BATTERY" on
page 8-49.
OK
3. Check the spark plug.
Refer to "CHECKING THE
SPARK PLUG" on page 3-6.
OK
4. Check the ignition spark gap.
Refer to "CHECKING THE
IGNITION SPARK GAP" on page
8-55.
NG
5. Check the spark plug cap.
Refer to "CHECKING THE SPARK
PLUG CAP" on page 8-54.
OK
6. Check the ignition coil.
Refer to "CHECKING THE
IGNITION COIL" on page 8-54.
OK
7. Check the crankshaft position
sensor.
Refer to "CHECKING THE
CRANKSHAFT POSITION
SENSOR" on page 8-55.
OK
NG Replace the fuse(s).
• Clean the battery terminals.
NG
• Recharge or replace the battery.
Re-gap or replace the spark plug.
NG
Ignition system is OK.
OK
Replace the spark plug cap.
NG
Replace the ignition coil.
NG
Replace the crankshaft position
NG
sensor.
8-3
IGNITION SYSTEM