Yamaha YFZ450S 2003 Service Manual page 342

EBS01052
4. Starting circuit cut-off relay
• Remove the starting circuit cut-off relay
from the wire harness.
• Connect the pocket tester (Ω × 1) and bat-
tery (12 V) to the starting circuit cut-off
relay as shown.
Positive battery terminal → red/black 1
Negative battery terminal →
sky blue 2 or black/yellow 3
Positive tester probe → red/black 1
Negative tester probe → yellow/black 4
4
1
• Does the starting circuit cut-off relay have
continuity between red/black and yellow/
black?
YES
ELECTRIC STARTING SYSTEM
3
B/Y
Y/B
Sb R/B
2
NO
Replace the starting
circuit cut-off relay.
EBS01053
5. Starting circuit cut-off relay (diode)
• Remove the starting circuit cut-off relay
from the wire harness.
• Connect the pocket tester (Ω × 1) to the
starting circuit cut-off relay as shown.
• Measure the starting circuit cut-off relay for
continuity as follows.
Positive tester probe →
Negative tester probe →
Positive tester probe →
Negative tester probe →
2
NOTE:
_
When you switch the tester's positive and
negative probes, the readings in the above
chart will be reversed.
• Are the testing readings correct?
8 - 19
ELEC
sky blue 1
Continuity
red/black 2
red/black 2
No
continuity
sky blue 1
B/Y
Y/B
Sb R/B
1
YES
Replace the starting
circuit cut-off relay.
– +
NO