7.5
Section 7
Electrical System and Components
7
CD Ignition System Troubleshooting Guide
The following guide will help locate and correct ignition system problems.
Problem Test
Conclusion
1. Make sure the spark plug lead is connected
to the spark plug.
2. Check the condition of spark plug. Make
sure gap is set to 0.76 mm (0.030 in.).
3. a. Test for spark with ignition tester SPX No.
KO1046. Disconnect spark plug lead
and connect it to the post terminal of the
tester. See Figure 7-4. Connect the clip
to a good ground, not the spark plug.
NOTE: To maintain engine speeds
normally obtained during
cranking, do not remove the
engine spark plug.
b. Make sure the engine ignition switch,
kill switch, or key switch is in the ‘‘run’’
position.
c. Crank the engine (minimum speed 500
RPM), and observe the tester. Visible
and audible sparks should be produced.
4. Measure the resistance of module
secondary using an ohmmeter (see Figures
7-2 and 7-5):
Zero ohmmeter before testing. Connect
one ohmmeter lead to laminations (A).
Connect the other lead to the spark plug
terminal (C) of high-terminal lead. With the
ohmmeter leads connected in this manner,
the resistance of secondary should be
7,900 to 18,400 ohms.
NOTE: This test cannot be performed
unless module has been fired at
least once.
2. If plug is in good condition, check/adjust
gap and reinstall.
3. If visible and audible sparks are produced,
the ignition module is OK.
If visible and audible sparks are not
produced:
a. Make sure the engine ignition switch,
kill switch, or key switch is in the ‘‘run’’
position.
b. Check wires and terminals of ignition
module and other components for
accidental grounding and damaged
insulation.
c. If wires and terminals are OK, the
ignition module is probably faulty and
should be replaced. Test module
further using an ohmmeter (Test 4).
4. If the resistance is low or 0 ohms, the
module secondary is shorted. Replace the
module.*
If the resistance is high or infinity ohms,
the module secondary is open. Replace the
module.*
If the resistance is within the specified
range, the module secondary is OK.
Engine
Will
Not
Start
*Refer to the Disassembly and Reassembly
Sections for complete ignition module
removal and installation procedures.
Figure 7-4. Ignition Tester, SPX Part No. KO1046. Figure 7-5. Testing CD Ignition Module Secondary.
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