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SECTION 8
ELECTRICAL SYSTEM AND COMPONENTS
ignition System Troubleshooting Guide
The following guide will help locate and comect ignition system-related starting problems.
This procedure uses a
simple tester which can be easily made by the serviceman. Refer to the "Special Tools" Section for ignition sys-
tem tester construction details.
NOTE:
Use a low-voltage ohmmeter when ohmmeter is required. Always zero ohmmeter on each scale before
testing to ensure accurate readings.
Problem
Test
Conclusion
1. Make sure spark plug leads are connected to
spark plugs.
2. Check condition of spark plugs.
Make sure
If plugs ara in good condition, check/adjust
Qaps are set to .035".
gaps and reinstall.
3. Check ignition module using test plugs (refer to
If visible and audible sparks ARE produced, the
the "Special Tools" section and Figure 8-2).
ignition module is OK.
а.
Remove the high-tension leads from the
It visible and audible sparks ARE NOT
engine spark plugs, and connect them to
produced:
the test plugs.
&. Make sure engine ignition switch and/or
NOTE:
To maintain engine speeds normally
key switch are in the "run" position.
obtained during cranking, do not re-
move the engine spark plugs.
b. Check wires and terminais of ignition mod-
ENGINE
ule and other components for accidental
NOT
b. Make sure the engine ignition switch (kill
grounding and/or damaged insulation.
START
Switch) and/or key switch are in the "run"
Position.
c. Crank the engine and observe the test
plugs. Visible and audible sparks should
be produced.
. If wires and terminals are OK, the ignition
module is probably faulty and should be
replaced. Test module further using an
ohmmeter (Test 4).
о
4. Measure the secondary resistance of module
using an ohmmeter,
Refer to Figures 8-1
and 8-4.
NOTE:
Module must have been "fixed" to per-
form Test 4.
Secondary
Secondary
Leads/Terminals
Resistance
C-D
22,000/42,000 ohms.
If resistance is within range, module secondary
is OK.
If resistance is low or 0 ohms, module second-
ary is shorted.
Replace module.
И resistance is high or infinity ohms, module
secondary is open.
Replace module.
8.2
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