Yamaha YZ450F 2021 - Checking the Relays; Checking the Relay Unit (Diode)

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ELECTRICAL COMPONENTS

8-47

has cooled down to the ambient tempera-

ture.

e. Measure the voltage between the termi-

nals of the battery.

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.

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

Main relay

EAM30495

CHECKING THE RELAY UNIT (DIODE)

1. Check:

• Diode

Out of specification  Replace.

TIP

The digital circuit tester and the multimeter with

tachometer readings are shown in the following

table.

Digital circuit tester (CD732)

90890-03243

Model 88 Multimeter with tachom-

eter

YU-A1927

1. Positive battery terminal

2. Negative battery terminal

3. Positive tester probe

4. Negative tester probe

Result

Continuity

(between “3” to “4”)

R/W

Br/W

R/Y