Checking The Relays; Checking The Relay Unit (Diode) - Yamaha YZ450FN 2022 Owner's Service Manual

has cooled down to the ambient tempera-
ture.
e. Measure the voltage between the battery
terminals.
13.25 V or more  The battery is normal.
Checking is finished.
10 V or more and less than 13.25 V 
Perform 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.
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
Br/W
L
2 1
8-47
ELECTRICAL COMPONENTS
Main relay
3
4
2
1
L/R R/L
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")
EAM30495

CHECKING THE RELAY UNIT (DIODE)

1. Check:
• Diode
Out of specification  Replace.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
TIP
The digital circuit tester and the multimeter with
tachometer readings are shown in the following
table.