Mitsubishi Montero (2004+). Manual — part 393
STARTING SYSTEM
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ENGINE ELECTRICAL
16-27
INSPECTION
M1162001300049
.
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. .In the case 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
16-28
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
16-29
IGNITION SYSTEM
GENERAL DESCRIPTION
M1163000100283
This system is provided with three ignition coils (A, B
and C) with bult-in three ignition power transistors for
the number 1 and number 4 cylinders, number 2 and
number 5 cylinders and number 3 and number 6 cyl-
inders respectively.
Interruption of the primary current flowing in the pri-
mary 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 gen-
erated 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 5 cylinders, and when the primary cur-
rent flowing in ignition coil C is interrupted, the high
voltage thus generated is applied to the spark plugs
of number 3 and number 6 cylinders.
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 (A, B and C) 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.
AK301584
INTAKE AIR TEMPERATURE SENSOR
BAROMETRIC PRESSURE SENSOR
CAMSHAFT POSITION SENSOR
CRANKSHAFT POSITION SENSOR
TRANSMISSION RANGE SWITCH
IGNITION SWITCH-ST
KNOCK SENSOR
ENGINE COOLANT TEMPERATURE
SENSOR
VOLUME AIR FLOW SENSOR
PCM
TO TACHOMETER
IGNITION COIL A
IGNITION COIL B
IGNITION COIL C
IGNITION
SWITCH
BATTERY
SPARK PLUGS
CYLINDER NO.
3
6
5
2
4
1
AB
IGNITION SYSTEM
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ENGINE ELECTRICAL
16-30
SPECIAL TOOLS
M1163000600299
ON-VEHICLE SERVICE
KNOCK CONTROL SYSTEM CHECK
M1163001800100
Check the knock sensor circuit if diagnostic trouble code, No.
P0325 is shown.
Refer to GROUP 13A, Multiport Fuel Injection (MFI)
− Multiport
Fuel Injection (MFI) Diagnosis
− Diagnostic Trouble Code Pro-
cedures
− DTC P0325 : Knock Sensor Circuit
SPARK PLUG CABLE TEST
M1163000900029
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.
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991348
Test harness set
MB991348-01
Inspection of ignition
primary voltage (ignition
power transistor
connection)
MD998773
Knock sensor wrench
Tool not available
Knock sensor removal
and installation
MB991348
AKX00431
SPARK PLUG CABLE
AB
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