Checking The Relay Unit (Diode) - Yamaha WR450FN 2022 Owner's Service Manual

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")
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.
ELECTRICAL COMPONENTS
No continuity
Positive tester probe  Sky blue
"1"
Negative tester probe 
Green/Black "2"
Continuity
Positive tester probe 
Green/Black "2"
Negative tester probe  Sky
blue "1"
No continuity
Positive tester probe  Red "3"
Negative tester probe 
Red/Blue "4"
Continuity
Positive tester probe 
Red/Blue "4"
Negative tester probe  Red "3"
No continuity
Positive tester probe 
Blue/White "5"
Negative tester probe 
Blue/Green, Blue/White "6"
Continuity
Positive tester probe 
Blue/Green, Blue/White "6"
Negative tester probe 
Blue/White "5"
No continuity
Positive tester probe 
Blue/Black "7"
Negative tester probe 
Blue/Red "8"
Continuity
Positive tester probe 
Blue/Red "8"
Negative tester probe 
Blue/Black "7"
No continuity
Positive tester probe 
Brown/White, Brown "9"
Negative tester probe 
Blue/White "10"
Continuity
Positive tester probe 
Blue/White "10"
Negative tester probe 
Brown/White, Brown "9"
a. Disconnect the diode from the wire har-
ness.
b. Connect the digital circuit tester () to the
diode coupler as shown.
c. Check the diode for continuity.
d. Check the diode for no continuity.
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