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TSB: Engine 022 (Rev) May 2006
Page 2 of 5
3. Using a fine copper or brass wire brush,
carefully remove carbon or any deposits from
terminal and electrodes. Carbon or any other
deposits MUST be removed before
performing resistance check.
Note: Be careful not to damage or crack
center Electrode Insulator.
4. Spark plug at must be at room temperature
(about 68 degrees F.). Using an ohmmeter place one lead on the spark plug terminal and
the other lead on the center electrode.
5. Check resistance reading with the chart below.
SUBJECT:
SIGMA 3.5 ENGINE SPARK PLUG & IGNITION COIL INSPECTION PROCEDURE
Ohmmeter
Resistor
Electrodes
Gasket
Center Electrode Resistance Check
Insulator
Terminal
.
.
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TSB: Engine 022 (Rev) May 2006
6. Place the ohmmeter leads on the center
electrode and the spark plug thread area.
Note: When measuring resistance in M Ωrange DO NOT allow hand to come
in contact with leads.
Page 3 of 5
SUBJECT:
SIGMA 3.5 ENGINE SPARK PLUG & IGNITION COIL
7. Check resistance reading with the chart below.
SPARK PLUG GROUND ELECTRODE
GAP CHECK:
1. With spark plug removed, insert wire feeler gauge between spark plug electrodes.
Adjust air gap or replace, as necessary
according to the chart below.
Insulation Resistance Check
Spark Plug Gap Check
.
.
Ohmmeter
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IGNITION COIL INSPECTION:
1. Visual Inspection
• Visually inspect the rubber cap for white
discoloration in the area circled. If white
discoloration is present it is an indicationthat there is a pinhole in the rubber
allowing the spark voltage to leak through
the insulation to ground.
TSB: Engine 022 (Rev) May 2006
Page 4 of 5
SPARK PLUG GASKET THICKNESS
CHECK:
1. Check spark plug gasket for damage or distortion. If gasket is damaged or distorted
replace gasket. Replace spark plug if
gasket is non-removable.
2. Check spark plug gasket thickness with
calipers per table below.
3. When installing spark plugs;
• Use a very small amount of anti-seize
compound on the spark plug threads.
Note: Use non-metallic anti-seizecompound.
• Torque the spark plugs to specifications
as listed in the chart below.
SUBJECT:
SIGMA 3.5 ENGINE SPARK PLUG & IGNITION COIL INSPECTION PROCEDURE
OK Replace
WhiteDiscoloration
No Yes
Ignition Coil Inspection Chart
Spark Plug Gasket Thickness Table and Torque Specification
Check for
Discoloration
Here
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TSB: Engine 022 (Rev) May 2006
Terminal 1 and (+)Terminal Terminal 3 and (+)Terminal 2
Connection Continuity(approx. 0.78 )
Disconnection No Continuity
Page 5 of 5
SUBJECT:
SIGMA 3.5 ENGINE SPARK PLUG & IGNITION COIL INSPECTION PROCEDURE
2. Measure Primary Coil Resistance
• Measure Primary coil resistance using an
ohmmeter.
• Place the leads of the ohmmeter on the
terminals as shown in the illustration C.
• Check the resistance (if there is current)
between terminal 3 and 2 when
connecting / disconnecting terminal 1 and
terminal (+) after connecting (-) terminal
of 5V power to terminal 2 of the power
transistor.
3. Measure Secondary Coil Resistance
• Measure the secondary coil resistance
using an ohmmeter.
• Place the leads of the ohmmeter on the
terminals as shown in the illustration D.
4. If ignition coil passes inspection checks 1-3
of the Ignition Coil Inspection, the coil is
good and must be reused.
OK Replace
ResistanceValue
10.4 ~ 15.6 KBelow 10.4 Kor over 15.6 K
Primary Coil Resistance
Secondary Coil Resistance
C
D
Ω
Replace the coil if there is a malfunction.
ΩΩ
Ω