Troubleshooting - Yamaha YFZ450S 2003 Service Manual

EBS01050

TROUBLESHOOTING

The starter motor fails to turn.
Check:
1. fuse
2. battery
3. starter motor
4. starting circuit cut-off relay
5. starting circuit cut-off relay (diode)
6. starter relay
7. main switch
8. engine stop switch
9. neutral switch
10.clutch switch
11.start switch
12.wiring connections
(of the entire starting system)
NOTE:
_
• Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank cover
3. side covers (left and right)
4. front fender
• Troubleshoot with the following special
tool(s).
Pocket tester
P/N. YU-03112-C, 90890-03112
EBS01043
1. Fuse
• Check the fuse for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the fuse OK?
YES
ELECTRIC STARTING SYSTEM
NO
Replace the fuse.
EBS01044
2. Battery
• Check the condition of the battery.
Refer to "CHECKING AND CHARGING
THE BATTERY" in chapter 3.
Minimum open-circuit voltage
12.8 V or more at 20 °C (68 °F)
• Is the battery OK?
EBS01051
3. Starter motor
• Connect the positive battery terminal 1
and starter motor lead 2 with a jumper
lead 3.
WARNING
_
• A wire that is used as a jumper lead
must have at least the same capacity or
more as that of the battery lead, other-
wise the jumper lead may burn.
• This check is likely to produce sparks,
therefore make sure nothing flammable
is in the vicinity.
• Does the starter motor turn?
8 - 18
ELEC
YES
• Clean the battery
terminals.
• Recharge or
replace the battery.
YES
Repair or replace the
starter motor.
– +
NO
NO