Checking The Relays; Checking The Diode - Yamaha YZ450FX 2019 Owner's Service Manual

13.25 V or more  The battery is normal.
Checking is finished.
10 V or more and less than 13.25 V  Per-
form from step (c) again.
Less than 10 V  Replace the battery.
TIP
Before replacing the battery, make sure that the
battery temperature is proper (temperature not
more than 65 C (149 F) or less than 0 C (32
F)). Otherwise, wait until the battery tempera-
ture is proper and perform the procedure from
step (c) again.
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EAM30292

CHECKING THE RELAYS

Check each switch for continuity with the digital
circuit tester. If the continuity reading is incor-
rect, replace the relay.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
1. Disconnect the relay from the wire harness.
2. Connect the digital circuit tester () and bat-
tery (12 V) to the relay terminal as shown.
Check the relay operation.
Out of specification  Replace.
Starter relay
3
4
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" to "4")
R/W R/Y
L Br/W
2 1
8-61
ELECTRICAL COMPONENTS
Main relay
3
4
2
1
L/R R
Br
R,R/W
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" to "4")
Radiator fan motor relay
3
4
2
1
P/L
Br,R/W
R/L
R/W
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" to "4")
EAM30293

CHECKING THE DIODE

1. Check:
• Diode
Out of specification  Replace.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927