Checking The Ignition Spark Gap; Checking The Crankshaft Position Sensor - Yamaha VMAX 2009 Service Manual

c. Measure the primary coil resistance.
L LLL L LLL L L LLL L
2. Check:
• Secondary coil resistance
Out of specification → Replace.
Secondary coil resistance
8.50–11.50 kΩ
M MMM M MMM M 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.
Pocket tester
90890-03112
Analog pocket tester
YU-03112-C
• Negative tester probe →
black/orange "1"
• Positive tester probe →
spark plug terminal "2"
c. Measure the secondary coil resistance.
L LLL L LLL L L LLL L
EAS28930

CHECKING THE IGNITION SPARK GAP

1. Check:
• Ignition spark gap
Out of specification → Perform the ignition
system troubleshooting, starting with step 5.
Refer to "TROUBLESHOOTING" on page
8-4.
Minimum ignition spark gap
6.0 mm (0.24 in)
TIP
If the ignition spark gap is within specification,
the ignition system circuit is operating normally.
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
M MMM M MMM M
a. Disconnect the spark plug cap from the spark
LLL
plug.
b. Connect the ignition checker "1" as shown.
MMM
2. Ignition coil
c. Turn the main switch to "ON" and engine stop
switch to "
d. Measure the ignition spark gap "a".
e. Crank the engine by pushing the start switch
" " and gradually increase the spark gap un-
til a misfire occurs.
L LLL L LLL L
EAS28120
CHECKING THE CRANKSHAFT POSITION
SENSOR
1. Disconnect:
• Crankshaft position sensor coupler
(from the wire harness)
2. Check:
LLL
• Crankshaft position sensor resistance
Out of specification → Replace the crank-
shaft position sensor.
M MMM M MMM M
a. Connect the pocket tester (Ω × 100) to the
crankshaft position sensor coupler as shown.
8-140
M MMM M M MMM M M MMM M
Ignition checker
90890-06754
Opama pet-4000 spark checker
YM-34487
".
L LLL L L LLL L L LLL L
Crankshaft position sensor resis-
tance
192–288 Ω at 20 °C (68 °F)
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