Yamaha YZ 2018 Series, Owner'S Service Manual

Page: 308 / 402

ELECTRIC STARTING SYSTEM
8-9
EASB29B328
TROUBLESHOOTING
The starter motor fails to turn.
TIP
Before troubleshooting, remove the following part (s):
1. Seat
2. Side cover (left/right)
3. Air scoop (left/right)
4. Fuel tank
5. Air filter case cover
1. Check the fuse.
Refer to “CHECKING THE FUSES”
on page 8-60.
NG

Replace the fuse(s).
OK

2. Check the battery.
Refer to “CHECKING AND
CHARGING THE BATTERY” on
page 8-61.
NG

• Clean the battery terminals.
• Recharge or replace the battery.
OK

3. Check the starter motor operation.
Refer to “CHECKING THE START-
ER MOTOR OPERATION” on page
8-68.
OK

Starter motor is OK. Perform the electric
starting system troubleshooting, starting
with step 5.
NG

4. Check the starter motor.
Refer to “CHECKING THE START-
ER MOTOR” on page 5-36.
NG

Repair or replace the starter motor.
OK

5. Check the relay unit (Starting circuit
cut-off relay).
Refer to “CHECKING THE RE-
LAYS” on page 8-64.
NG

Replace the relay unit.
OK

6. Check the diode.
Refer to “CHECKING THE DIODE”
on page 8-65.
NG

Replace the diode.
OK

7. Check the starter relay.
Refer to “CHECKING THE RE-
LAYS” on page 8-64.
NG

Replace the starter relay.
OK
