Troubleshooting - Yamaha YFZ450S 2003 Service Manual

EBS01067

TROUBLESHOOTING

Any of the following fail to light: head-
light, tail/brake light.
Check:
1. light switch
2. lighting coil resistance
3. wiring connections
(of the entire lighting 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
EAS00783
1. Light switch
• Check the light switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the light switch OK?
YES
NO
Replace the handle-
bar switch.
LIGHTING SYSTEM
EAS00776
2. Lighting coil resistance
• Disconnect the A.C. magneto coupler from
the wire harness.
• Connect the pocket tester (Ω × 1) to the
lighting coil terminals as shown.
Positive tester probe → yellow 1
Negative tester probe → ground 2
W Y
• Measure the lighting coil resistance.
Lighting coil resistance
0.224 ~ 0.336 Ω at 20 °C (68 °F)
• Is the lighting coil OK?
8 - 30
ELEC
1
2
YES
Replace the pickup
coil/stator assembly.
– +
1
NO