Checking The Spark Plug Caps; Checking The Ignition Coils - Yamaha MT-01 T 2005 Service Manual

3
5
4
Sb/W B/R
L/G L/Y Sb B/Y
M MMM M MMM M M MMM M
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.
L LLL L LLL L L LLL L
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.
Resistance
10.0 kΩ
M MMM M MMM M M MMM M
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.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
c. Measure the spark plug cap resistance.
L LLL L LLL L L LLL L
1
2
L R/L L/R
L/W R
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
ELECTRICAL COMPONENTS
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.
M MMM M MMM M
MMM
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.
LLL
• Positive tester probe →
black/red "1"
• Negative tester probe →
orange or gray/red or gray/black "2"
MMM
c. Measure the primary coil resistance.
L LLL L LLL L
2. Check:
• Secondary coil resistance
Out of specification → Replace.
M MMM M MMM M
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.
LLL
7-99
Primary coil resistance
2.16–2.64 Ω
M MMM M M MMM M M MMM M
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
L LLL L L LLL L L LLL L
Secondary coil resistance
8.64–12.96 kΩ
M MMM M M MMM M M MMM M
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
M MMM M MMM
L LLL L LLL
M MMM M MMM