Kohler Courage SV710-740 Service Manual page 62

a. If the problem is gone, the electrical system
on the unit is suspect. Check the key switch,
wires, connections, safety interlocks, etc.
b. If the problem persists the condition is
associated with the ignition or electrical
system of the engine. Leave the kill lead
isolated until all testing is completed.
2. Test for spark on both cylinders with Kohler
ignition tester, (Kohler Part No. 24 455 02-S).
Disconnect one spark plug lead and connect it to
the post terminal of the tester. Connect the clip to
a good ground, not to the spark plug. Crank the
engine and observe the tester spark gap. Repeat
the procedure on the other cylinder. Remember
to reconnect the first spark plug lead.
a. If one side is not firing, check all wiring,
connections, and terminations on that side. If
wiring is okay, replace ignition module and
retest for spark.
b. If the tester shows spark, but the engine
misses or won't run on that cylinder, try a
new spark plug.
c. If neither side is firing, recheck position of
ignition switch and check for shorted kill
lead.
A digital spark advance ignition system (DSAI) is
used on some models. The DSAI ignition system is an
advanced 12 volt version of the fixed timing ignition
system used on other models. Two inductive style
ignition modules control the ignition timing based on
engine RPM. A typical DSAI application (Figure 7-6)
consists of the following components:
• A magnet assembly, which is permanently affixed
to the flywheel.
• Two inductive 12 volt ignition modules, which
mount on the engine crankcase (Figure 7-6).
• A 12 volt battery, which supplies current to the
ignition modules.
• A kill switch (or key switch) which grounds the
spark advance module to stop the engine.
• Two spark plugs.
The system provides more consistent energy to the
spark plugs at all engine speeds by using the 12 volt
battery as its source of power. Engine speed and top
dead center (TDC) location reference information
is provided by the flywheel magnet group as it
passes the ignition module. System triggering and
engine timing is performed by a digitally controlled
microprocessor. This digital control provides
repeatable and consistent engine cylinder spark
timing. Each DSAI module performs its function
independently for each engine cylinder.
The DSAI ignition system is designed to be trouble
free for the life of the engine. Other than periodically
checking/replacing the spark plugs, no maintenance,
timing, or module 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 problem.
Reported ignition problems are most often 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 fit snugly. Make
sure the ignition switch is in the RUN position.
NOTE: Ignition systems are sensitive to excessive
load on the kill lead. If a customer complains
of hard starting, low power, or misfire under
load, it may be due to excessive draw on
the kill circuit. Perform the appropriate test
procedure.
The following procedures are provided for
troubleshooting ignition problems on DSAI equipped
engines. They will allow you to isolate and pinpoint
the failed component(s).
• Hand Tachometer
• Ignition Tester* (Kohler Part No. 25 455 01-S)
• Automotive Timing Light
• Multi-meter (Digital)
• Spark plug gap 0.76 mm (0.030 in.)