Kohler Comand Pro CH1000 Service Manual page 57

Kill Switch or
Off Position of
Key Switch
Figure 7-4. Capacitive Discharge Fixed Timing Ignition System.
The timing of the spark is controlled by the location of the fl ywheel magnet group as referenced to engine top
dead center.
Figure 7-5. Capacitive Discharge Ignition Module Schematic.
Troubleshooting CD Ignition Systems
The CD ignition systems are designed to be trouble
free for the life of the engine. Other than periodically
checking/replacing the spark plugs, no maintenance
or timing adjustments are necessary or possible.
Mechanical systems do occasionally fail or break
down however, so the following troubleshooting
information is provided to help you get to the root of
a reported problem.
CAUTION: High-Energy Electric Spark!
The CD ignition systems produce a high-energy electric
spark, but the spark must be discharged, or damage to the
system can result. Do not crank or run an engine with a
spark plug lead disconnected. Always provide a path for the
spark to discharge to ground.
Reported ignition problems are most oft en due to
poor connections. Before beginning the test procedure,
check all external wiring. Be certain all ignition-related
wires are connected, including the spark plug leads.
Be certain all terminal connections fi t snugly. Make
sure the ignition switch is in the run position.
(0.28/0.33 mm)
0.011/0.013 in. Air Gap
D1
SCS
L1
L2
Electrical System and Components
Ignition
Modules
C1
T1
P
S
NOTE: The CD ignition systems are sensitive to
excessive load on the kill lead. If a customer
complains of hard starting, low power,
or misfi re under load, it may be due to
excessive draw on the kill circuit. Perform the
appropriate test procedure.
Test Procedure for Fixed Timing CD Ignition
Systems
Isolate and verify the trouble is within the engine
ignition system.
1. Locate the plug connectors where the wiring
harnesses from the engine and equipment are
joined. Separate the connectors and remove the
white kill lead from the engine connector. Rejoin
the connectors and position or insulate the kill
lead terminal so it cannot touch ground. Try to
start the engine to verify whether the reported
problem is still present.
NOTE: If the engine starts or runs during any of
the testing, you may need to ground the
kill lead to shut it down. Because you have
interrupted the kill circuit, it may not stop
using the switch.
Section 7
Spark Plug
Magnet
Flywheel
Spark Plug
7
7.5