Mitsubishi Evolution X. Manual — part 237
16-1
GROUP 16
ENGINE
ELECTRICAL
CONTENTS
CHARGING SYSTEM . . . . . . . .
GENERAL INFORMATION . . . . . .
GENERAL SPECIFICATIONS. . . . . . . .
SERVICE SPECIFICATIONS. . . . .
CHARGING SYSTEM DIAGNOSIS
SPECIAL TOOL . . . . . . . . . . . . . . .
ON-VEHICLE SERVICE. . . . . . . . .
GENERATOR OUTPUT LINE VOLTAGE
DROP TEST . . . . . . . . . . . . . . . . . . . . .
OUTPUT CURRENT TEST . . . . . . . . . .
REGULATED VOLTAGE TEST. . . . . . .
WAVE PATTERN CHECK USING AN
OSCILLOSCOPE. . . . . . . . . . . . . . . . . .
GENERATOR ASSEMBLY . . . . . .
REMOVAL AND INSTALLATION . . . . .
DISASSEMBLY AND ASSEMBLY. . . . .
INSPECTION . . . . . . . . . . . . . . . . . . . . .
STARTING SYSTEM . . . . . . . . .
GENERAL INFORMATION . . . . . .
GENERAL SPECIFICATIONS. . . . . . . .
SERVICE SPECIFICATIONS. . . . .
ON-VEHICLE SERVICE. . . . . . . . .
STARTER RELAY CHECK . . . . . . . . . .
STARTER MOTOR ASSEMBLY . .
REMOVAL AND INSTALLATION. . . . . .
INSPECTION . . . . . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . .
INSPECTION . . . . . . . . . . . . . . . . . . . . .
IGNITION SYSTEM . . . . . . . . .
GENERAL INFORMATION . . . . . .
GENERAL SPECIFICATIONS . . . . . . . .
SERVICE SPECIFICATIONS . . . . .
ON-VEHICLE SERVICE . . . . . . . . .
KNOCK CONTROL SYSTEM CHECK. .
IGNITION COIL CHECK. . . . . . . . . . . . .
SPARK PLUG TEST . . . . . . . . . . . . . . .
SPARK PLUG CHECK AND CLEANING
CAMSHAFT POSITION SENSOR CHECK
CRANKSHAFT POSITION SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . .
IGNITION COIL. . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION. . . . . .
CAMSHAFT POSITION SENSOR .
REMOVAL AND INSTALLATION. . . . . .
CRANKSHAFT POSITION SENSOR
REMOVAL AND INSTALLATION. . . . . .
KNOCK SENSOR . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION. . . . . .
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-2
CHARGING SYSTEM
GENERAL INFORMATION
M1161000101291
The charging system charges the battery with the
generator output to keep the battery charged at a
constant level during varying electrical load.
OPERATION
AK400075
Voltage
Time
Approximately
AC
14.4 V
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 above.
The average output voltage fluctuates slightly with
the generator 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 generator output voltage rises as the field cur-
rent increases and it falls as the field current
decreases. When the battery positive voltage (gener-
ator S terminal voltage) reaches a regulated voltage
of approximately 14.4 V, the field current is cut off.
When the battery positive voltage drops below the
regulated voltage, the voltage regulator regulates the
output voltage to a constant level by controlling the
field current.
In addition, when the field current is constant, the
generator output voltage rises as the engine speed
increases.
AK704219
Generator
B
ECM
CAN
communication
G
S
L
FR
Battery
+
-
AB
Generator
malfunction
light
Combination
meter
Stator coil
Stator coil
Voltage
regulator
Field coil
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-3
GENERAL SPECIFICATIONS
M1161000200518
Item
Specification
Type
Positive battery positive voltage sensing
Identification number
A3TL0081
Part No.
1800A155
Rated output V/A
12/120
Voltage regulator
Electronic built-in type
SERVICE SPECIFICATIONS
M1161000301024
Item
Standard value
Limit
Regulated voltage
(Ambient temperature at
voltage regulator)
−20° C (−4° F)
14.2
− 15.4
−
20
° C (68° F)
13.9
− 14.9
−
60
° C (140° F)
13.4
− 14.6
−
80
° C (176° F)
13.1
− 14.5
−
Generator output line voltage drop (at 30 A) V
−
Maximum 0.3
Output current
−
70 % of normal output
current
Field coil resistance
Ω
Approximately 2
− 5
−
Brush protrusion length mm (in)
−
Minimum 2 (0.08)
CHARGING SYSTEM DIAGNOSIS
M1161000700535
TROUBLESHOOTING HINTS
Generator malfunction light does not go on when the ignition
switch is turned to ON, before the engine starts.
• Check the generator malfunction light.
Generator malfunction light does not switch off after the engine
starts.
• Check the IC voltage regulator inside the generator.
Discharged or overcharged battery.
• Check the IC voltage regulator inside the generator.
TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the fol-
lowing steps.
STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A,
Chassis Electrical
− Battery − On-vehicle Service −
Battery Test
YES : Go to Step 2.
NO : Charge or replace the battery.
CHARGING SYSTEM
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ENGINE ELECTRICAL
16-4
STEP 2.
Q: Is the generator drive belt in good condition? (Refer to
GROUP 00, General
− Maintenance Service − Drive Belts
(For Generator, Power Steering Pump and Air
Conditioning) (Check)
.)
YES : Go to Step 3.
NO : Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the generator malfunction light come on when the
ignition switch is turned on?
YES : Go to Step 4.
NO : Check the ignition switch. (Refer to GROUP 54A,
Chassis Electrical
− Ignition Switch − Ignition
Switch
− Inspection
).
Check the generator malfunction light and its related
circuits.
Check the generator. (Refer to Charging System
−
Generator Assembly
STEP 4.
Q: Does the generator malfunction light go out after
starting the engine?
YES : Go to Step 5.
NO : Check the generator (Refer to Charging System
−
Generator Assembly
− Inspection
.)
STEP 5.
Q: Is an oscilloscope available?
YES : Go to Step 6.
NO : Go to Step 7.
STEP 6.
Q: Does the oscilloscope show a normal wave pattern?
(Refer to Charging System
− On-vehicle Service − Wave
Pattern Check Using an Oscilloscope
.)
YES : Go to Step 7.
NO : Check the generator. (Refer to Charging System
−
Generator Assembly
− Inspection
.)
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