Mitsubishi Lancer Evolution IX. Manual — part 346
16-1
GROUP 16
CONTENTS
CHARGING SYSTEM . . . . . . . .
GENERAL INFORMATION . . . . . .
SERVICE SPECIFICATIONS. . . . .
SPECIAL TOOL . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . .
ALTERNATOR OUTPUT LINE VOLTAGE
DROP TEST . . . . . . . . . . . . . . . . . . . . .
OUTPUT CURRENT TEST . . . . . . . . . .
REGULATED VOLTAGE TEST. . . . . . .
WAVEFORM CHECK USING
AN OSCILLOSCOPE. . . . . . . . . . . . . . .
ALTERNATOR ASSEMBLY . . . . .
REMOVAL AND INSTALLATION . . . . .
DISASSEMBLY AND REASSEMBLY . .
INSPECTION . . . . . . . . . . . . . . . . . . . . .
STARTING SYSTEM . . . . . . . . .
GENERAL INFORMATION . . . . . .
SERVICE SPECIFICATIONS. . . . .
STARTER MOTOR ASSEMBLY . .
REMOVAL AND INSTALLATION . . . . .
STARTER MOTOR ASSEMBLY
INSPECTION . . . . . . . . . . . . . . . . .
DISASSEMBLY AND REASSEMBLY . .
INSPECTION . . . . . . . . . . . . . . . . . . . . .
IGNITION SYSTEM . . . . . . . . .
GENERAL INFORMATION . . . . . .
SERVICE SPECIFICATIONS . . . . .
SPECIAL TOOL . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE . . . . . . . . .
IGNITION COIL (WITH BUILT-IN POWER
TRANSISTOR) CHECK . . . . . . . . . . . . .
IGNITION COIL RELAY CHECK
<RH DRIVE VEHICLES> . . . . . . . . . . . .
SPARK PLUG CABLE CHECK . . . . . . .
SPARK PLUG CHECK AND CLEANING
CAMSHAFT POSITION SENSOR CHECK
CRANK ANGLE SENSOR CHECK . . . .
DETONATION SENSOR CHECK . . . . .
IGNITION SECONDARY VOLTAGE
WAVEFORM CHECK USING
AN OSCILLOSCOPE . . . . . . . . . . . . . . .
IGNITION COIL. . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION. . . . . .
CAMSHAFT POSITION SENSOR .
REMOVAL AND INSTALLATION. . . . . .
CRANK ANGLE SENSOR . . . . . . .
REMOVAL AND INSTALLATION. . . . . .
DETONATION SENSOR . . . . . . . .
REMOVAL AND INSTALLATION. . . . . .
CHARGING SYSTEM
ENGINE ELECTRICAL
16-2
CHARGING SYSTEM
GENERAL INFORMATION
M1161000100652
The charging system uses the alternator output to
keep the battery charged at a constant level under
various electrical loads.
OPERATION
AK400075
Voltage
Time
Approximately
14.4 V
AB
Rotation of the excited field coil generates AC volt-
age in the stator.
This alternating current is rectified through diodes to
DC voltage having a waveform shown in the illustra-
tion.
The average output voltage fluctuates slightly with
the alternator load condition.
When the ignition switch is turned on, current flows in
the field coil and initial excitation of the field coil
occurs.
When the stator coil begins to generate power after
the engine is started, the field coil is excited by the
output current of the stator coil.
The alternator output voltage rises as the field cur-
rent increases and it falls as the field current
decreases. When the battery voltage (alternator "S"
terminal voltage) reaches a regulated voltage of
approximately 14.4 V, the field current is cut off.
When the battery voltage drops below the regulated
voltage, the voltage regulator regulates the output
voltage to a constant level by controlling the field cur-
rent.
In addition, when the field current is constant, the
alternator output voltage rises as the engine speed
increases.
SYSTEM DIAGRAM
AK304222
Alternator
B
Stator coil
Engine-ECU
G
S
L
FR
Voltage
regulator
Charge
warning lamp
Ignition switch
Battery
Field coil
+
–
AB
CHARGING SYSTEM
ENGINE ELECTRICAL
16-3
ALTERNATOR SPECIFICATIONS
Item
Specifications
Type
Battery voltage sensing
Rated output V/A
12/90
Voltage regulator
Electronic built-in type
SERVICE SPECIFICATIONS
M1161000300407
Item
Standard value
Limit
Alternator output line voltage drop (at 30 A) V
−
maximum 0.3
Regulated voltage ambient
temperature at voltage regulator V
−20°C
14.2
− 15.4
−
20
°C
13.9
− 14.9
−
60
°C
13.4
− 14.6
−
80
°C
13.1
− 14.5
−
Output current
−
70 % of normal output current
CHARGING SYSTEM
ENGINE ELECTRICAL
16-4
SPECIAL TOOL
M1161000600356
Tool
Number
Name
Use
B991502
MB991502
M.U.T.-II sub assembly
• Checking the idle speed
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
A
B
C
D
E
F
DO NOT USE
MB991955
A:
MB991824
B:
MB991827
C:
MB991910
D:
MB991911
E:
MB991825
F:
MB991826
M.U.T.-III sub assembly
• A: Vehicle
communication
interface (V.C.I.)
• B: M.U.T.-III USB
cable
• C: M.U.T.-III main
harness A (Vehicles
with CAN
communication
system)
• D: M.U.T.-III main
harness B (Vehicles
without CAN
communication
system)
• E: M.U.T.-III
measurement adapter
• F: M.U.T.-III trigger
harness
• Checking the idle speed
M.U.T.-III main harness B
(MB991911) should be used.
M.U.T.-III main harness A should
not be used for this vehicle.
MB991519
Alternator test harness
Checking the alternator
("S" terminal voltage)
CAUTION
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