Ignition unit and component
5-28
2. Check:
• Hour meter operation
Hour meter if there is no illuminated Re-
place.
a. Connect the battery leads to the hour
meter coupler terminals “a” and “b
”.
b. Check for hour meter displayed all the
segment has been
illuminated for 2
seconds.
c. Disconnect the battery leads to the
hour meter coupler terminals.
3. Connect:
• Hour meter coupler
Ignition unit and component
Checking the ignition spark
1. Check:
• Ignition spark
No spark Check ignition system circuit.
a. Disconnect the spark plug cap from
the spark plug.
b. Connect the spark plug cap to the spe-
cial service tool “1”.
c. Check the ignition spark using the
YDIS “Stationary
test”.
Do not touch any of the connections of the
special service tool.
d. Remove the special service tool, and
then connect the spark plug cap.
Checking the ignition coil
1. Measure:
• Ignition coil input voltage
Out of specification Check the
wire har-
ness for continuity.
a. Disconnect the ignition coil couplers
“a
” and “b”.
b. Turn the engine start switch to ON,
and then measure the input voltage at
the ignition coil coupler terminal an
d
ground.
c. Turn the engine start switch to OFF.
Ignition checker (Spark gap tester)
“1”
90890-06754
Input voltage
12 V
#1, #4
Red/White (R/W)–Ground
#2, #3
Red/Yellow (R/Y)–Ground
0
5
OK
1
R/W
R/Y
a
b
a
b
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