Mitsubishi Galant. Manual — part 344
16-2
REMOVAL AND INSTALLATION
<3.0L ENGINE> . . . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY. . . . .
CAMSHAFT POSITION SENSOR
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION
<2.4L ENGINE> . . . . . . . . . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR
REMOVAL AND INSTALLATION
<2.4L ENGINE> . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION
<3.0L ENGINE> . . . . . . . . . . . . . . . . . . .
KNOCK SENSOR . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION
<3.0L ENGINE> . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . .
FASTENER TIGHTENING
SPECIFICATIONS . . . . . . . . . . . . .
GENERAL SPECIFICATIONS . . . .
SERVICE SPECIFICATIONS . . . . .
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-3
.
C H A R G IN G SYSTEM
GENERAL DESCRIPTION
M1161000100061
The charging system charges the battery with the
generator output to keep the battery charged at a
constant level during varying electrical load.
Operation
Rotation of the excited field coil generates AC
voltage in the stator.
This alternating current is rectified through diodes to
DC voltage having a waveform shown in the
illustration at left.
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
current increases and it falls as the field current
decreases. When the battery positive voltage
(generator S terminal voltage) reaches a regulated
voltage of approximately 14.4V, 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.
AKX00183
VOLTAGE
TIME
APPROXIMATELY
14.4V
AB
AK000621
GENERATOR
GENERATOR
<2.4L ENGINE>
<3.0L ENGINE>
B
B
STATOR
COIL
STATOR
COIL
PCM
PCM
G
S
L
FR
G
S
L
FR
VOLTAGE REGULATOR
VOLTAGE REGULATOR
CHARGING
WARNING
LIGHT
CHARGING
WARNING
LIGHT
IGNITION
SWITCH
IGNITION
SWITCH
BATTERY
FIELD COIL
FIELD COIL
−
BATTERY
−
AK000621AB
+
+
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-4
CHARGING SYSTEM DIAGNOSIS
M1161000700063
TROUBLESHOOTING HINTS
1. Charging warning light does not go on when the ignition
switch is turned to ON, before the engine starts.
•
Check the bulb.
2. Charging warning light does not switch off after the engine
starts.
•
Check the I voltage regulator inside the generator.
3. Discharged or overcharged battery.
•
Check the I voltage regulator inside the generator.
4. The charging warning light illuminates dimly.
•
Check the diode (inside the combination meter) for a short-
circuit.
TROUBLESHOOTING GUIDE
The charging system troubleshooting guide is shown in the
following chart.
STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A,
Battery
−−−−
On-vehicle Service - Battery Check
YES : Go to Step 2.
NO : Charge or replace the battery.
STEP 2.
Q: Is the generator drive belt in good condition? (Refer to
GROUP 00, Maintenance Service - Drive Belts
YES : Go to Step 3.
NO : Adjust the belt tension or replace the belt.
STEP 3.
Q: Does the charging warning light brightly when the
ignition switch is turned on?
YES : Go to Step 4.
NO :
•
Check the ignition switch. (Refer to GROUP 54A,
Ignition switch
•
Check for burnt-out charging warning light.
•
Check the generator. (Refer to Generator
−
Disassembly and assembly
−
Inspection
•
Check the charging warning light-related circuits.
STEP 4.
Q: Does the charging warning light go out after starting the
engine?
YES : Go to Step 5.
NO : Check the generator (Refer to Generator
−
Disassembly and assembly
−
Inspection
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-5
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
−−−−
Wave pattern check using a
oscilloscope
YES : Go to Step 7.
NO : Check the generator. (Refer to Generator
−
Disassembly and assembly
−
Inspection
STEP 7.
•
Engine: 2,500 r/min
•
Headlight: ON (high beam)
•
Voltage between generator terminal B and the positive
battery terminal
OK: 0.5V or less
•
Voltage between the negative battery terminal and
generator body
OK: 0.5V or less
Q: Are the generator output line and ground line in good
condition?
YES : Go to Step 8.
NO : Check the generator output line and ground line.
STEP 8.
Q: Is the output current normal? (Refer to Charging system
−−−−
On vehicle service
−−−−
Output current test
.)
YES : Go to Step 9.
NO : Check the generator (Refer to Generator
−
Disassembly and assembly
−
Inspection
STEP 9.
Q: Is the regulated voltage normal? (Refer to Charging
system
−−−−
On vehicle service - Regulated voltage test
.)
YES : Go to Step 10.
NO : Check the generator (Refer to Generator
−
Disassembly and assembly
−
Inspection
STEP 10.
Q: Is the voltage drops in the generator output line
normal?
YES : Generator is normal. Check other systems.
NO : Check the output line.
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