Mitsubishi Galant. Manual — part 352

IGNITION SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-34

IGNITION COIL CHECK

M1163001200078

<3.0L ENGINE>

1. Measurement of the primary coil resistance

Measure the resistance between connector terminals 1 and
2 of the distributor.

Standard value: 0.56

−−−−

0.68

Ω

Ω

Ω

Ω

2. Measurement of the secondary coil resistance

Measure the resistance between the high-voltage terminal
and connector terminal 1.

Standard value: 9.4

−−−−

12.8 k

Ω

Ω

Ω

Ω

IGNITION COIL POWER TRANSISTOR
CONTINUITY CHECK

M1163001300042

<3.0L ENGINE>

NOTE: An analog-type ohmmeter should be used.

NOTE: Connect the negative (

−

) probe of the ohmmeter to

terminal 2.

CAUTION

This test must be performed quickly (in less than 10
seconds) to prevent coil from burning and ignition power
transistor from breaking.
Replace the ignition power transistor if there is a malfunction.

IGNITION FAILURE SENSOR CHECK

M1163003000036

<2.4L ENGINE>

NOTE: An analog-type ohmmeter should be used.
Check that the resistance between terminals 3 and 4 is at the
standard value.

Standard value: 0.1

Ω

Ω

Ω

Ω

or less

AKX01266

HIGH-VOLTAGE
TERMINAL

1 2 3 4 5 6 7

AB

VOLTAGE: 1.5V

BATTERY
POWER SUPPLY
TERMINAL

SPECIFIED
CONDITION

When current is
flowing

3

−

4

2

−

3

When current is not
flowing

-

-

AKX01267

1.5V

1 2 3 4 5 6 7

+

AB

−

AKX01268 AB

1 2 3 4

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-35

SPARK PLUG CABLE RESISTANCE CHECK

M1163001400049

Measure the resistance of the all spark plug leads.
1. Check the cap and coating for cracks.

2. Measure the resistance.

Limit: 22 k

Ω

Ω

Ω

Ω

SPARK PLUG TEST

M1163001500079

1. Remove the spark plug and connect to the spark plug cable.

2. Ground the spark plug outer electrode (body), and crank the

engine.
Check that there is an electrical discharge between the
electrodes at this time.

SPARK PLUG CHECK AND CLEANING

M1163004300029

<2.4L ENGINE>

1. Check that the plug is not burned, that the insulator plug is

not damaged, and that the seizure state is good.

2. If cleaning is required due to carbon deposits, etc., clean

using a plug cleaner or wire brush, etc.

3. Check the plug gap using a plug gap gauge, and adjust if not

within the standard value.

Standard value: 1.0

−−−−

1.1 mm (0.039

−−−−

0.043 inch)

AKX00382

AKX00432

SPARK PLUG

AB

AKX00277

DEFECTIVE INSULATION

DEFECTIVE INSULATION

DEFECTIVE
INSULATION

GOOD

AB

AKX01272

AKX01272

PLUG GAP
GAUGE

MEASU-
REMENT
DIRECTION

AB

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-36

SPARK PLUG CHECK AND CLEANING

M1163004300030

<3.0L ENGINE>

CAUTION

•

Do not attempt to adjust the gap of the platinum plug.

•

Cleaning of the platinum plug may result in damage to
the platinum tips. Therefore, if carbon deposits must be
removed, use a plug cleaner and complete cleaning
within 20 seconds to protect the electrode. Do not use a
wire brush.

Check the plug gap and replace if the limit is exceeded.

Standard value: 1.0

−−−−

1.1 mm (0.039

−−−−

0.043 inch)

Limit: 1.3 mm (0.051 inch)

CAMSHAFT POSITION SENSOR CHECK

M1163004400037

<2.4L ENGINE>

Refer to GROUP 13A, Multiport fuel injection (MFI) diagnosis

−

Diagnostic trouble code procedures

−

Camshaft position

sensor circuit malfunction (

P.13A-179

).

CRANK ANGLE SENSOR CHECK

M1163004500034

<2.4L ENGINE>

Refer to GROUP 13A, Multiport fuel injection (MFI) diagnosis

−

Diagnostic trouble code procedures

−

Crankshaft position

sensor circuit malfunction (

P.13A-170

).

CRANK ANGLE SENSOR CHECK

M1163004500045

<3.0L ENGINE>

Refer to GROUP 13B, Multiport fuel injection (MFI) diagnosis

−

Diagnostic trouble code procedures

−

Crankshaft position

sensor circuit malfunction (

P.13B-240

).

IGNITION SECONDARY VOLTAGE WAVE
PATTERN CHECK USING A OSCILLOSCOPE

M1163001700073

<2.4L ENGINE>

MEASUREMENT METHOD
1. Clamp the spark plug cable (Number 1 or 3) with the

secondary pickup.

NOTE: Because of the two-cylinder simultaneous ignition
system, the waves for two cylinders in each group appear
during wave observation. However, wave observation is
carried out for the cylinder (Number 1 or 3) with the spark
plug cable which has been clamped by the secondary
pickup.

AKX00383

AKX00383

Platinum
tips

AB

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-37

NOTE: Identification of which cylinder wave pattern is
displayed can be difficult, but the wave pattern of the
cylinder which is clamped by the secondary pickup will be
stable, so this can be used as a reference.

2. Clamp the spark plug cable (Number 1 or 3) with the trigger

pickup.

NOTE: Clamp the same spark plug cable as the one which
has been clamped by the secondary pickup.

STANDARD WAVE PATTERN

Observation Conditions

FUNCTION

SECONDARY

Pattern height

High (or low)

Pattern selector

Raster

Engine speed

Curb idle speed

AKX00278

kV

0

SECONDARY

IGNITION

VOLTAGE

WAVE PATTERN

IGNITION VOLTAGE
(POINT D)

SPARK LINE(POINT A)

DWELL SECTION

WAVE DAMPING REDUCTION SECTION(POINT B)

POINT C

TIME

AB