Kohler HD Series Service Manual page 34

Electrical System
Electronic Ignition System Tests (Retractable Start)
Test Ignition System
Remove spark plug. Check condition of spark plug. Make sure gap is set to 0.76 mm (0.030 in.). Install spark plug and
torque to 27 N·m (20 ft. lb.).
Condition
Spark plug is not receiving ignition
pulse.
Spark plug in bad condition.
Test for Spark
NOTE: To maintain engine speeds obtained during cranking, do not remove spark plug.
Test for spark with spark plug tester.
1. Disconnect spark plug lead and connect to post terminal of tester. Connect clip to ground, not to spark plug.
2. Place engine ignition switch in RUN position to initiate test.
3. Pull retractable starter to a minimum of 350-450 RPM and check for spark. Visible and/or audible sparks should
be produced.
Condition
Visible and/or audible sparks are
produced.
Visible and/or audible sparks are not
produced.
Test Ignition Module
1. Remove retractable starter and engine cover; refer to Disassembly/Inspection and Service. Disconnect kill lead
from terminal on ignition module.
2. Reinstall retractable starter and engine cover. Pull retractable starter to a minimum of 350-450 RPM and check for
spark.
Condition
Visible and/or audible sparks are
produced.
Visible and/or audible sparks are not
produced.
3. Set an ohmmeter to Rx1K or Rx10K scale and zero.
Connect one ohmmeter lead to module kill lead tab and connect other lead into spark plug cap. Resistance should
be 5-15 K ohms. If resistance is other than specifi ed, replace ignition module.
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Possible Cause
Spark Plug
Spark Plug
Possible Cause
Ignition Module
Ignition Module or
Wiring and Connections
Possible Cause
Kill/Stop Engine Wiring and
Connections
Ignition Module
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Conclusion
Check gap and adjust if necessary;
reinstall plug.
Replace plug, set gap, and install.
Conclusion
Ignition module is OK.
Make sure ignition switch, kill switch
or key switch is in RUN position.
Check all safety and operator
presence control switches (for
example: fl ywheel brake kill switch)
and other components, including
wiring and connections for accidental
grounding.
If components, wiring, including
terminals are all verifi ed OK, test
ignition module.
Conclusion
Problem is elsewhere in system/
wiring.
Test ignition module (step 3).
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