Mitsubishi Galant (2004+). Manual - part 173

STARTING SYSTEM

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ENGINE ELECTRICAL

16-33

INSPECTION

M1162001300102

.

COMMUTATOR CHECK
1. Place the armature on a pair of V-blocks, and check the 

deflection by using a dial gauge.

Standard value: 0.05 mm (0.002 inch)
Limit: 0.1 mm (0.004 inch)

2. Check the outer diameter of the commutator.

Standard value: 29.4 mm (1.16 inches)
Minimum limit: 28.8 mm (1.13 inches)

3. Check the depth of the undercut between segments.

Standard value: 0.5 mm (0.02 inch)
Minimum limit: 0.2 mm (0.008 inch)

.

BRUSH CHECK
1. Check the brush for roughness of the surface that contacts 

the commutator and check the brush length. Replace the 
brush holder if this measurement exceeds the limit.

Minimum limit:

 7.0 mm (0.28 inch)

2. If the contacting surface has been corrected or the brush 

has been replaced, correct the contacting surface by 
winding sandpaper around the commutator.

.

AKX00373

AKX00374

AKX00375

SEGMENT

UNDERCUT

MICA

AB

AK101390

LIMIT LENGTH

AB

STARTING SYSTEM

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ENGINE ELECTRICAL

16-34

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 the 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

16-35

IGNITION SYSTEM

GENERAL DESCRIPTION

M1163000100272

<2.4L ENGINE>

This system is provided with four ignition coils with 
built-in ignition power transistors for each of the cylin-
ders. 
Interruption of the primary current flowing in the pri-
mary side of ignition coil generates a high voltage in 
the secondary side of ignition coil.
The powertrain control module (PCM) controls the 
four ignition power transistors to turn them alter-
nately ON and OFF. This causes the primary cur-
rents in the ignition coils to be alternately interrupted 
and allowed to flow to fire the cylinders in the order 
1-3-4-2.

The PCM 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 to provide igni-
tion at the most appropriate timing in response to the 
engine operation conditions.
When the engine is cold or operated at high alti-
tudes, the ignition timing is slightly advanced to pro-
vide optimum performance.

AK304112AB

PCM

IGNITION SWITCH - ST

IGNITION COIL

SPARK PLUG

CYLINDER No.

BATTERY

1

2

3

4

INTAKE AIR TEMPERATURE SENSOR

CAMSHAFT POSITION SENSOR

CRANKSHAFT POSITION SENSOR

TRANSMISSION RANGE SWITCH

IGNITION SWITCH-ST

KNOCK SENSOR 

ENGINE COOLANT TEMPERATURE SENSOR

MASS AIRFLOW SENSOR

IGNITION SYSTEM

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ENGINE ELECTRICAL

16-36

<3.8L ENGINE>

This system is provided with six ignition coils with 
built-in ignition power transistors for each of the cylin-
ders. 
Interruption of the primary current flowing in the pri-
mary side of ignition coil generates a high voltage in 
the secondary side of ignition coil.
The powertrain control module (PCM) controls the 
three ignition power transistors to turn them alter-
nately ON and OFF. This causes the primary cur-
rents in the ignition coils to be alternately interrupted 
and allowed to flow to fire the cylinders in the order 
1-2-3-4-5-6.

The PCM 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 to provide igni-
tion at the most appropriate timing in response to the 
engine operation conditions.
When the engine is cold or operated at high alti-
tudes, the ignition timing is slightly advanced to pro-
vide optimum performance.

SPECIAL TOOLS

M1163000600073

AK303636AB

MASS AIRFLOW 
SENSOR

PCM

IGNITION 
SWITCH - ST

IGNITION 
COIL

SPARK PLUG

CYLINDER No.

BATTERY

1

2

3

4

5

6

INTAKE AIR 
TEMPERATURE SENSOR

ENGINE COOLANT 
TEMPERATURE SENSOR

CAMSHAFT POSITION
SENSOR

CRANKSHAFT POSITION
SENSOR

TRANSMISSION RANGE

 

SWTCH

IGNITION SWITCH-ST

KNOCK SENSOR

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MD998773
Knock sensor wrench

MD998773-01

Knock sensor removal 
and installation