Kohler Command PRO CH440 Service Manual page 45

Electronic Ignition Systems and Oil Sentry
1. Disconnect cap from spark plug and attach it to
terminal end of spark tester. Attach tester spring clip
to a good ground, not to spark plug. Turn ignition/key
switch ON and crank engine while observing fi ring
tip of tester.
Condition
Tester is fi ring.
Tester doesn't fi re.
2. On electric start engines, remove starter cover
panel. Locate black/white kill lead coming from
ignition module inside blower housing. Disconnect
bullet connector where kill lead plugs into harness.
Repeat spark test (step 1).
Condition
Spark is now present.
Still no spark.
3. Disconnect bullet connector where Oil Sentry
control module joins lead from Oil Sentry
switch (yellow leads). Repeat spark test again.
Condition
Spark is now present.
4. Set an ohmmeter to Rx1 scale and zero meter.
Connect black ohmmeter lead to yellow Oil Sentry
control module lead and touch red ohmmeter lead to
black wire.
Condition
Continuity should be
indicated.
17 690 01 Rev. L
Tests
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Conclusion
Ignition system is good.
Install a new spark plug
and try to start engine. If it
still will not start, check
other possible causes
(fuel, compression, etc.).
Go to step 2.
Conclusion
Check for a shorted lead
in kill circuit or a faulty
switch (step 7).
Go to step 3.
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fl oat
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Conclusion
Control module or fl oat
switch is faulty. Test
control module (step 4) and
fl oat switch (step 5). If there
is still no spark, test
ignition module (step 6).
Conclusion
Replace Oil Sentry
™
control module for any
other results.
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5. With crankcase oil at proper level, set an ohmmeter
to Rx1 scale and zero meter. Connect one
ohmmeter lead to Oil Sentry
(yellow with green sleeve) and touch other lead to a
bare spot on crankcase (ground).
Condition
If continuity is indicated.
If no continuity is
indicated.
6. Set an ohmmeter to Rx1K or Rx10K scale and zero.
a. Connect one ohmmeter lead to kill lead (black/
white) terminal and connect other lead into spark
plug cap. Resistance should be 13.5-18.0 K
ohms. If resistance is other than specifi ed,
go to b.
b. Remove blower housing and remove ignition
module. With kill lead removed, test resistance
from small spade terminal to spark plug cap.
Resistance should be 9.5-12.9 K ohms. If
resistance is not in this range, replace ignition
module.
7. Set an ohmmeter to Rx1 scale and zero meter. Test
ignition/key switch as follows.
a. Trace two black leads from on/off switch and
separate them from any connections. Connect
ohmmeter leads to switch leads, and check for
continuity in both switch positions.
Condition
Continuity should be
indicated when and only
when switch is in OFF
position.
b. On electric start engines, trace four leads (red,
red/white, black, black/white) from key switch and
separate them from any connections. Connect
ohmmeter leads to black and black/white leads
and check for continuity in all three switch
positions. Then connect ohmmeter leads to red
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and red/white leads and test again in all three
switch positions.
Condition
Continuity should be
indicated between black
and black/white leads only
when key switch is in OFF
position. There should be
continuity between red
and red/white leads only
in start position.
Electrical System
fl oat switch lead
™
Conclusion
Replace fl oat switch.
Go to step 6.
Conclusion
Replace switch for any
other results.
Conclusion
Replace switch for any
other results.
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