28
Electrical System
KohlerEngines.com 18 690 01 Rev. B
Electronic Ignition Systems and Oil Sentry
™
Tests
4. Set an ohmmeter to Rx1 scale and zero meter.
Connect one ohmmeter lead to Oil Sentry
™
fl oat
switch lead (yellow with green sleeve) and touch
other lead to a bare spot on crankcase (ground).
Drain oil from crankcase and repeat test.
With oil at proper level, no continuity should have
been indicated. After oil was drained, continuity
should have been indicated.
Condition Conclusion
No continuity indicated. Remove closure plate
from engine and remove
fl oat switch for further
testing (steps 4a and 4b).
a. If continuity was indicated with and without oil
above, check if insulation has been scraped off
fl oat switch lead.
Condition Conclusion
Lead wire is bare. Allow it to short, repair
with electrical tape, or
replace fl oat switch.
b. With fl oat switch removed, connect one
ohmmeter lead to fl oat switch lead terminal and
connect other lead to mounting bracket. Test
resistance with switch in normal position and
inverted. Repeat test 2 or 3 times in each
direction.
Condition Conclusion
Switch continuity should
be as indicated.
If not, replace it.
5. Set an ohmmeter to Rx1K or Rx10K scale and zero.
Connect one ohmmeter lead to kill lead (black/white)
terminal and connect other lead into spark plug cap.
a. Remove cap from spark plug lead and test
resistance of cap alone.
b. If resistances are other than specifi ed, remove
blower housing and remove ignition module. With
kill lead and spark plug cap removed, test
resistance from small spade terminal to core of
spark plug lead wire. If resistance is not in this
range, replace module.
Resistance Chart
Ignition Module 13.5-18.0 K ohms
Cap 4-6 K ohms
Spade Terminal to Spark
Plug Lead Wire
9.5-12.9 K ohms
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 Conclusion
Tester is fi ring. 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.).
Tester doesn't fi re. Go to step 2.
2. Trace yellow lead wire from Oil Sentry
™
control
module to Oil Sentry
™
fl oat switch. Disconnect bullet
connector where it joins lead from Oil Sentry
™
fl oat
switch (yellow lead wire). Repeat spark test.
Condition Conclusion
Spark is now present. Control module or fl oat
switch is faulty. Test
control module (step 3)
and fl oat switch (step 4).
Still no spark. Test ignition module (step
5).
3. Connect a jumper lead from yellow lead terminal to a
bare spot on crankcase (ground). Turn ignition
switch ON, crank engine, and observe red LED
indicator lamp.
Condition Conclusion
Indicator lamp was not
fl ashing.
Trace black lead from
ignition switch. Separate
bullet connector where
switch lead joins double
red harness lead. Crank
engine, again observing
red LED indicator lamp.
Indicator lamp fl ashes
during cranking.
Control module is
functioning, proceed to
step 5. If lamp was not
fl ashing initially but did
fl ash in step 3, control
module is good, but
ignition switch is probably
faulty. Test fl oat switch
(step 4) and ignition
switch (step 6).
To Next Page
Loading...
