Yamaha F400A 2022 - Ignition Unit and Component; Checking the Ignition Spark; Checking the Ignition Coil; Checking the Crankshaft Position Sensor

5-35
Ignition unit and component
Ignition unit and component
Checking the ignition spark
1. Check:
• Ignition coil
a. Remove the ignition coils.
b. Connect the special service tool “1” to
the ignition coil.
TIP:
Repeat steps (b)–(d) for each ignition coil.
c. Check the ignition spark using the
YDIS “Stationary test”.
Do not touch any of the connections of the
special service tool.
d. Disconnect the special service tool.
e. Install the ignition coils.
Checking the ignition coil
1. Check:
• Ignition coil
a. Disconnect the ignition coil couplers
“a”.
b. Turn the main switch or power switch
to ON, and then measure the input volt-
age at the ignition coil coupler.
c. Turn the main switch or power switch
to OFF.
d. Connect the ignition coil couplers.
Checking the crankshaft position
sensor
1. Remove:
• Intake manifold (STBD)
See “Intake manifold” (6-24).
2. Check:
• Crankshaft position sensor
a. Disconnect the crankshaft position
sensor coupler “a”.
b. Turn the main switch or power switch
to ON, and then measure the input volt-
age at the crankshaft position sensor
coupler.
Ignition checker (Spark gap tes-
ter) “1”
90890-06754
Spark checker “1”
YM-34487
OK
0
5
1
Input voltage
12 V
Red/Yellow (R/Y)–Black (B)
a
R/Y B
a
Or
a
B