Yamaha MT-09 2021, Service Manual

Page: 361 / 752

8-6
IGNITION SYSTEM
EAS30492
TROUBLESHOOTING
The ignition system fails to operate (no spark or intermittent spark).
TIP
• Before troubleshooting, remove the following part(s):
1. Rider seat
2. Fuel tank side cover
3. Fuel tank center cover
4. Fuel tank
5. Air filter case
1. Check the fuses.
(Main, backup 2, ignition 1, and ig-
nition 2)
Refer to “CHECKING THE FUS-
ES” on page 8-55.
NG
→
Replace the fuse(s).
OK
↓
2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-56.
NG
→
• Clean the battery terminals.
• Recharge or replace the battery.
OK
↓
3. Check the spark plugs.
Refer to “CHECKING THE SPARK
PLUGS” on page 3-5. NG
→
Re-gap or replace the spark plugs.
OK
↓
4. Check the ignition spark gap.
Refer to “CHECKING THE IGNI-
TION SPARK GAP” on page 8-59. OK
→
Ignition system is OK.
NG
↓
5. Check the ignition coils.
Refer to “CHECKING THE IGNI-
TION COILS” on page 8-59. NG
→
Replace the ignition coils.
OK
↓
6. Check the crankshaft position sen-
sor.
Refer to “CHECKING THE
CRANKSHAFT POSITION SEN-
SOR” on page 8-60.
NG
→
Replace the crankshaft position sensor.
OK
↓
7. Check the main switch.
Refer to “CHECKING THE
SWITCHES” on page 8-53. NG
→
Replace the main switch/immobilizer unit.
OK
↓