Yamaha YZF-R1 2020 Service Manual page 476

1. Disconnect the relay from the wire harness.
2. Connect the digital circuit tester (Ω) 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
Relay operation
Continuity
(between "3" and "4")
Relay unit (starting circuit cut-off relay)
Br/W L/W
L/R L/W R/W L/B L/Y Sb B/Y Sb/W
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
R/W
R/W L/W
1 2
R/W L R/L
ELECTRICAL COMPONENTS
Relay unit (fuel pump relay)
3
Br/W
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
Radiator fan motor relay
R/W
1. Positive battery terminal
2. Negative battery terminal
3. Positive tester probe
4. Negative tester probe
Result
Continuity
(between "3" and "4")
EAS30795
CHECKING THE RELAY UNIT (DIODE)
1. Check:
• Relay unit (diode)
Out of specification → Replace.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with ta-
chometer
YU-A1927
8-43
2 1 4
L W / R W / L R/L
L/R L/W R/W L/B L/Y Sb B/Y Sb/W
R
R/B
G/Y