Yamaha Tracer MT09TRAH 2017 Service Manual page 534

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 tachom-
eter
YU-A1927
TIP
The digital circuit tester readings are shown in
the following table.
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
black/yellow "2"
No continuity
Positive tester probe
black/yellow "2"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
black/red "3"
No continuity
Positive tester probe
black/red "3"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
sky blue "1"
Negative tester probe
sky blue/white "4"
No continuity
Positive tester probe
sky blue/white "4"
Negative tester probe
sky blue "1"
Continuity
Positive tester probe
blue/black "5"
Negative tester probe
black/red "3"
No continuity
Positive tester probe
black/red "3"
Negative tester probe
blue/black "5"
ELECTRICAL COMPONENTS
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a. Disconnect the relay unit coupler from the
wire harness.
b. Connect the digital circuit tester () to the re-
lay unit terminal as shown.
c. Check the relay unit (diode) for continuity.
d. Check the relay unit (diode) for no continuity.
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EAS30558
CHECKING THE IGNITION COILS
The following procedure applies to all of the igni-
tion coils.
1. Check:
• Primary coil resistance
Out of specification  Replace.
Primary coil resistance
1.19–1.61 
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a. Remove the ignition coil from the spark plug.
b. Connect the digital circuit tester () to the ig-
nition coil as shown.
Digital circuit tester (CD732)
90890-03243
Model 88 Multimeter with tachom-
eter
YU-A1927
• Positive tester probe 
red/black "1"
• Negative tester probe 
Cylinder-#1 ignition coil
orange "2"
Cylinder-#2 ignition coil
gray/red "2"
Cylinder-#3 ignition coil
orange/green "2"
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