Yamaha MT-01 T 2005 - Checking the Spark Plug Caps; Checking the Ignition Coils

ELECTRICAL COMPONENTS
7-99
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a. Disconnect the relay unit coupler from the
wire harness.
b. Connect the pocket tester (Ω × 1) to the relay
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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EAS28070
CHECKING THE SPARK PLUG CAPS
The following procedure applies to all of the
spark plug caps.
1. Check:
• Spark plug cap resistance
Out of specification → Replace.
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a. Remove the spark plug cap from the spark
plug lead.
b. Connect the pocket tester (Ω × 1k) to the
spark plug cap as shown.
c. Measure the spark plug cap resistance.
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EAS28100
CHECKING THE IGNITION COILS
The following procedure applies to all of the igni-
tion coils.
1. Check:
• Primary coil resistance
Out of specification → Replace.
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a. Disconnect the ignition coil connectors from
the ignition coil terminals.
b. Connect the pocket tester (Ω × 1) to the igni-
tion coil as shown.
c. Measure the primary coil resistance.
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2. Check:
• Secondary coil resistance
Out of specification → Replace.
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a. Disconnect the spark plug cap from the igni-
tion coil.
b. Connect the pocket tester (Ω × 1k) to the ig-
nition coil as shown.
Resistance
10.0 kΩ
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
L/G
L/Y
Sb
B/Y
Sb/W
L/W
R/LL/R
R
B/R
L
4
5
1
2
3
Primary coil resistance
2.16–2.64 Ω
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Positive tester probe →
black/red “1”
• Negative tester probe →
orange or gray/red or gray/black “2”
Secondary coil resistance
8.64–12.96 kΩ
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C