Electronic Ignition System - Onan T260G Service Manual

ELECTRONIC IGNITION SYSTEM
This section applies to those engines equipped with an
electronic battery ignition system. Both spark plugs fire
simultaneously, thus the need for a distributor is elimi-
nated. The electronic ignition module is located on the
engine gear cover behind the flywheel. The module
receives a timing signal from the magnets located within
a trigger ring which rotates on the engine crankshaft
(Figure 3). If the electronic ignition is suspected of mal-
functioning, proceed as follows:
I
IGNITION
MODULE
ES-1670
FIGURE 3. IGNITION MODULE AND TRIGGER RING
1.
Check all electrical connections to be sure they are
clean and tight. If all connections are good and
wiring is intact, go to step 2.
WARNING
d e l i v e r
The electronic ignition will
plugs even when rotated by hand. Care should be
taken to avoid an electrical shock.
WARNING
deliver full voltage to the spark
WARNING
b e f o r e
Failure to remove spark plugs
before turning engine over may
result in engine starting, which may cause severe
personal injury.
WARNING
away from spark plug hole may
Failure to ground spark tester
result in ignition of cylinder gases and may cause,
severe personal injury.
2. Pull spark plug wires off spark plugs and remove
spark plugs. Connect an approved spark tester to
each of the spark plug wires and ground them away
from spark plug hole. Turn key on and crank engine
over for 5 seconds while watching for spark. If a
spark occurs regularly, the problem is not in the
ignition system. If no spark occurs, go to step 3.
CAUTION
negative terminal. This willcause
Never putjumper lead to the coil
failure
of
the electronic ignition module.
3. Connect a jumper lead directly from the positive
battery terminal to the positive coil terminal
(smaller diameter of the two threaded posts). Crank
engine over while watching for spark. If spark
occurs, the problem is in the low oil pressure cut out
switch or related wiring, the lubricating system (low
oil. pressure), or in the other circuitry bringing
voltage to the coil. If no spark occurs, go to step 4.
4. Refer to IGNITION COIL section to test coil for
proper resistance. If coil checks out good, go to
step 5.
5. Connect positive side of voltmeter to negative
coil terminal (larger diameter of the two threaded
posts) and negative side of voltmeter to engine
ground. Turn key on and rotate flywheel slowly by
hand while observing voltmeter. Voltage should
switch back and forth between battery voltage and
1-1.5. If voltage does not switch properly, replace
ignition module.
6. Install spark plugs and wires. If ignition module is
being replaced, be sure to connect red lead from
new ignition module to positive (+)terminal of coil,
black lead from module to negative terminal of
coil.
CAUTION
negative terminal. This willcause
Never put B+ lead to the coil
failure of the electronic ignition module.
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