Mitsubishi Galant. Manual — part 351

STARTING SYSTEM

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ENGINE ELECTRICAL

16-30

OVERRUNNING CLUTCH CHECK
1. While holding the clutch housing, rotate the pinion. The drive

pinion should rotate smoothly in one direction, but should
not rotate in opposite direction. If the clutch does not
function properly, replace the overrunning clutch assembly.

2. Inspect the pinion for wear or burrs. If the pinion is worn or

burred, replace the overrunning clutch assembly. If the
pinion is damaged, also inspect the ring gear for wear or
burrs.

FRONT AND REAR BRACKET BUSHING CHECK
Inspect the bushing for wear or burrs. If the bushing is worn or
burred, replace the front bracket assembly or rear bracket
assembly.

ARMATURE CHECK
1. Check that the armature coil is not grounded.

2. Place the armature in a growler.

3. Hold a thin steel blade parallel and just above while rotating

the armature slowly in the growler. A shorted armature will
cause a blade to vibrate and be attracted to the core.
Replace the shorted armature.

4. Check the insulation between the armature coil cores and

the commutator segments. They are normal if there is no
continuity.

5. Check for continuity between the segments. The condition is

normal if there is continuity.

AKX00378

FREE

LOCK

AB

AKX00379

GROWLER

AB

AKX00380

AKX00381

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-31

IG N ITIO N SYSTEM

GENERAL DESCRIPTION

M1163000100067

<2.4L Engine>

This system is provided with two ignition coils (A and
B) with built-in ignition power transistors for the
number 1 and number 4 cylinders, and number 2 and
number 3 cylinders respectively.
Interruption of the primary current flowing in the
primary side of ignition coil A generates a high
voltage in the secondary side of ignition coil A.
The high voltage thus generated is applied to the
spark plugs of number 1 and number 4 cylinders to
generate sparks. At the time that the sparks are
generated at both spark plugs, if one cylinder is at
the compression stroke, the other cylinder is at the
exhaust stroke, so that ignition of the compressed
air/fuel mixture occurs only for the cylinder which is
at the compression stroke.
In the same way, when the primary current flowing in
ignition coil B is interrupted, the high voltage thus
generated is applied to the spark plugs of number 2
and number 3 cylinders.

The engine control module controls the two ignition
power transistors to turn them alternately ON and
OFF. This causes the primary currents in the ignition
coils to be alternately interrupted and allowed to flow
to fire the cylinders in the order 1

−

3

−

4

−

2.

The engine control module determines which ignition
coil should be controlled by means of the signals
from the camshaft position sensor which is
incorporated in the camshaft and from the crankshaft
position sensor which is incorporated in the
crankshaft.
It also detects the crankshaft position in order to
provide ignition at the most appropriate timing in
response to the engine operation conditions.
When the engine is cold or operated at high
altitudes, the ignition timing is slightly advanced to
provide optimum performance.

<3.0L Engine>

Interruption of the primary current flowing in the
primary side of the ignition coil generates high
voltage in the secondary side of the ignition coil. The
high voltage thus generated is directed by the
distributor to the applicable spark plug. The engine
firing order is 1

−

2

−

3

−

4

−

5

−

6 cylinders.

On application of high voltage, the spark plug
generates a spark to ignite the compressed air fuel
mixture in the combustion chamber.
The engine control module makes and breaks the
primary current of the ignition coil to regulate the
ignition timing.

AKX01212

INTAKE AIR TEMPERATURE SENSOR

BAROMETRIC PRESSURE SENSOR

CAMSHAFT POSITION SENSOR

CRANKSHAFT POSITION SENSOR

VEHICLE SPEED SENSOR

PARK/NEUTRAL POSITION SWITCH

IGNITION SWITCH-ST

CLOSED THROTTLE POSITION

SWITCH

ENGINE COOLANT TEMPERATURE
SENSOR

VOLUME AIR FLOW SENSOR

PCM

IGNITION
FAILURE
SENSOR

TO TACHOMETER

IGNITION COIL A

IGNITION COIL B

IGNITION
SWITCH

BATTERY

SPARK PLUGS

CYLINDER NO.

3

2

4

1

AC

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-32

The engine control module detects the crankshaft
position by the crankshaft position sensor. This
sensor is installed at the front end of the crankshaft
to provide ignition at the most appropriate timing for
the engine operating condition.

When the engine is cold, the ignition timing is slightly
advanced to provide optimum performance to the
operating condition.

SPECIAL TOOLS

M1163000600040

AKX01291

INTAKE AIR TEMPERATURE SENSOR

BAROMETRIC PRESSURE SENSOR

CRANKSHAFT POSITION SENSOR

CAMKSHAFT
POSITION
SENSOR

IGNITION
POWER
TRANSIST-
OR

VEHICLE SPEED SENSOR

PARK/NEUTRAL POSITION SWITCH

IGNITION SWITCH-ST

KNOCK SENSOR

ENGINE COOLANT TEMPERATURE
SENSOR

VOLUME AIR FLOW SENSOR

PCM

TO TACHOMETER

IGNITION COIL

DISTRIBUTOR

IGNITION
SWITCH

BATTERY

SPARK PLUGS

AC

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991348
Test harness set

Tool not available

Inspection of ignition
primary voltage (Ignition
power transistor
connection)

MD998773
Knock sensor wrench

MD998773-01

Knock sensor removal
and installation

MB991348

MD998773

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-33

ON-VEHICLE SERVICE

SPARK PLUG CABLE TEST

M1163000900030

WARNING

Wear rubber gloves while performing this test.

1. Disconnect, one at a time, each of the spark plug cables

while the engine is idling to check whether the engine's
running performance changes or not.

2. If the engine performance does not change, check the

resistance of the spark plug cable, and check the spark plug
itself.

IGNITION COIL CHECK

M1163001200056

<2.4L ENGINE

−−−−

With built-in ignition power

transistor>

Check by the following procedure, and replace the coil if there
is a malfunction.
SECONDARY COIL RESISTANCE CHECK
Measure the resistance between the high-voltage terminals of
the ignition coil.

Standard value: 8.5

−−−−

11.5 k

Ω

Ω

Ω

Ω

PRIMARY COIL AND IGNITION POWER TRANSISTOR
CONTINUITY CHECK
NOTE: An analog-type ohmmeter should be used.

NOTE: Connect the negative (-) probe of the ohmmeter to
terminal 1.

CAUTION

This test must be performed quickly (in less than 10
seconds) to prevent coil from burning and ignition power
transistor from breaking.

AKX01263AB

SPARK PLUG CABLE TEST

AKX01264

VOLTAGE: 1.5V

BATTERY
POWER SUPPLY
TERMINAL

SPECIFIED
CONDITION

When current is
flowing

2

−

3

1

−

2

When current is not
flowing

-

-

AKX01265AB

1.5V

1 2 3

+

−