Engine Service Manual

34
Electrical System
KohlerEngines.com 14 690 10 Rev. --
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 Possible Cause Conclusion
Spark plug is not receiving ignition
pulse.
Spark Plug Check gap and adjust if necessary;
reinstall plug.
Spark plug in bad condition. Spark Plug Replace plug, set gap, and install.
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 Possible Cause Conclusion
Visible and/or audible sparks are
produced.
Ignition Module Ignition module is OK.
Visible and/or audible sparks are not
produced.
Ignition Module or
Wiring and Connections
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.
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 Possible Cause Conclusion
Visible and/or audible sparks are
produced.
Kill/Stop Engine Wiring and
Connections
Problem is elsewhere in system/
wiring.
Visible and/or audible sparks are not
produced.
Ignition Module Test ignition module (step 3).
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.