Yamaha YFZ450S 2003 Service Manual page 343

EBS01054
6. Starter relay
• Disconnect the starter relay coupler from
the wire harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starter relay as shown.
Positive battery terminal → blue/black 1
Negative battery terminal →
Positive tester probe → red 3
Negative tester probe → black 4
3
R
B
4
• Does the starter relay have continuity
between red and black?
YES
EBS01041
7. Main switch
• Check the main switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the main switch OK?
YES
ELECTRIC STARTING SYSTEM
yellow/black 2
R
Y/B L/B
1 2
NO
Replace the starter
relay.
NO
Replace the main
switch.
EBS01042
8. Engine stop switch
• Check the engine stop switch for continu-
ity.
Refer to "CHECKING THE SWITCHES".
• Is the engine stop switch OK?
EBS01046
9. Neutral switch
• Check the neutral switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the neutral switch OK?
EBS01056
10.Clutch switch
• Check the clutch switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the clutch switch OK?
EBS01057
11.Start switch
• Check the start switch for continuity.
Refer to "CHECKING THE SWITCHES".
• Is the start switch OK?
8 - 20
ELEC
YES
Replace the handle-
bar switch.
YES
Replace the neutral
switch.
YES
Replace the clutch
switch.
YES
Replace the handle-
bar switch.
– +
NO
NO
NO
NO