Mitsubishi 380. Manual — part 245
16-2
CHARGING SYSTEM
GENERAL DESCRIPTION
M1161000100629
The charging system charges the battery with the
alternator output to keep the battery charged at a
constant level during varying electrical load.
OPERATION
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 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 positive voltage
(alternator 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
alternator output voltage rises as the engine speed
increases.
AKX00183
VOLTAGE
TIME
APPROXIMATELY
14.4 V
AB
06DB028A
ALTERNATOR
<3.8L ENGINE>
B
STATOR
COIL
ALTERNATOR
MALFUNCTION
LIGHT
IGNITION
SWITCH
BATTERY
FIELD COIL
+
–
S
L
VOLTAGE REGULATOR
CHARGING SYSTEM
ENGINE ELECTRICAL
16-3
CHARGING SYSTEM DIAGNOSIS
M1161000700427
TROUBLESHOOTING HINTS
Alternator malfunction light dose not go on when the ignition
switch is turned to ON, before the engine starts.
• Check the bulb.
Alternator malfunction light dose not switch off after the engine
starts.
• Check the IC voltage regulator inside the
alternatoralternator.
Discharged or overcharged battery.
• Check the IC voltage regulator inside the alternator.
The alternator malfunction 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 fol-
lowing steps.
STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A,
Chassis Electrical
− Battery − On-vehicle Service −
Battery Check
YES : Go to Step 2.
NO : Charge or replace the battery.
STEP 2.
Q: Is the alternator drive belt in good condition? (Refer to
GROUP 00, General
− Maintenance Service − Drive Belts
(For Alternator, 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 alternator 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
.)
• Check for burnt-out alternator malfunction light.
• Check the alternator. (Refer to Charging System −
Alternator Assembly
.)
• Check the alternator malfunction light-related
circuits.
CHARGING SYSTEM
ENGINE ELECTRICAL
16-4
STEP 4.
Q: Does the alternator malfunction light go out after
starting the engine?
YES : Go to Step 5.
NO : Check the alternator (Refer to Charging System
−
Alternator 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 alternator. (Refer to Charging System
−
Alternator Assembly
− Inspection
STEP 7.
• Engine: 2,500 r/min
• Headlight: ON (high beam)
• Voltage between alternator terminal B and the positive bat-
tery terminal
OK: 0.5 V or less
• Voltage between the negative battery terminal and
alternator body
OK: 0.5 V or less
Q: Are the alternator output wire and ground wire in good
condition?
YES : Go to Step 8.
NO : Check the alternator output wire and ground wire.
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 alternator (Refer to Charging System
−
Alternator Assembly
− Inspection
CHARGING SYSTEM
ENGINE ELECTRICAL
16-5
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 alternator (Refer to Charging System
−
Alternator Assembly
− Inspection
STEP 10.
Q: Is the voltage drop in the alternator output wire normal?
YES : Alternator is normal. Check other systems.
NO : Check the output wire.
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