Mitsubishi L200. Manual — part 220
CHARGING SYSTEM
ENGINE ELECTRICAL
16-10
12.Read the value displayed on the voltmeter when
the alternator output current alternator becomes
10 A or less.
13.If the voltage reading conforms to the value in the
voltage regulation, then the voltage regulator is
operating normally.
If the voltage is not within the standard value,
there is a malfunction of the voltage regulator or of
the alternator.
14.After the test, lower the engine speed to the idle
speed.
15.Turn the ignition switch to the "LOCK" (OFF)
position.
16.Remove the M.U.T.-III or tachometer.
17.Disconnect the negative battery cable.
18.Disconnect the ammeter and voltmeter.
19.Remove the special tool, and return the connector
to the original condition.
20.Connect the negative battery cable.
Voltage Regulation Table
STANDARD VALUE:
Inspection terminal
Voltage regulator ambient
temperature
°C
Voltage V
Terminal "S"
−20
14.2
− 15.4
20
13.9
− 14.9
60
13.4
− 14.6
80
13.1
− 14.5
WAVEFORM CHECK USING AN OSCILLOSCOPE
M1161001201428
MEASUREMENT METHOD
AK701885
AC
CH1
"B" terminal
Alternator
Connect the oscilloscope special patterns pick-up to
the alternator "B" terminal.
STANDARD WAVEFORM
Observation Conditions
Function
Special pattern
Pattern height
Variable
Variable knob
Adjust while viewing the waveform.
Pattern selector
Raster
Engine speed
Curb idle speed
AK701886AB
0.4
0.2
0
-0.2
-0.4
Voltage
at alternator
"B" terminal
Time
CHARGING SYSTEM
ENGINE ELECTRICAL
16-11
NOTE:
AK701862
The voltage waveform of the alternator "B" terminal
can undulate as shown in the illustration. This wave-
form is produced when the regulator operates
according to fluctuations in the alternator load (cur-
rent), and is normal for the alternator. In addition,
when the voltage waveform reaches an excessively
high value (approximately 2 V or higher at idle), it
often indicates an open circuit due to a brown fuse
between alternator "B" terminal and battery, but not a
defective alternator.
EXAMPLE OF ABNORMAL WAVEFORMS
NOTE:
.
1. The size of the waveform patterns differs largely, depending on the adjustment of the variable knob on the
oscilloscope.
2. Identification of abnormal waveforms is easier when there is a large output current (regulator is not oper-
ating). (Waveforms can be observed when the headlamps are illuminated.)
3. Check the conditions of the charging warning lamp (illuminated/not illuminated). Also, check the charging
system totally.
Abnormal waveform
Problem cause
Except Euro 5
Euro 5
Example 1
AK502669
Example 1
AK703778
Open diode
Example 2
AK502670
Example 2
AK703780
Short in diode
Example 3
AK502671
Example 3
AK703781
Broken wire in
stator coil
Example 4
AK502672
Example 4
AK703782
Short in stator
coil
CHARGING SYSTEM
ENGINE ELECTRICAL
16-12
CHARGING SYSTEM
ENGINE ELECTRICAL
16-13
ALTERNATOR ASSEMBLY
REMOVAL AND INSTALLATION
M1161001403804
CAUTION
When the specified alternator is not used, each ECU would probably fail.
Pre-removal Operation
• Air Cleaner Assembly Removal (Refer to GROUP 15 − Air
Cleaner ).
• Intercooler Inlet Air Hose Removal (Refer to GROUP 15 −
Intercooler ) <Except Euro5>.
• Intercooler Inlet Air Hose Removal (Refer to GROUP 15 −
Intercooler ) <Euro5>.
• A/C Compressor Drive Belt, Alternator and Power Steer-
ing Oil Pump Drive Belt Removal (Refer to GROUP 11A
−
Crankshaft Pulley ).
Post-installation Operation
• A/C Compressor Drive Belt, Alternator and Power Steer-
ing Oil Pump Drive Belt Installation (Refer to GROUP 11A
− Crankshaft Pulley ).
• Intercooler Inlet Air Hose Installation (Refer to GROUP 15
− Intercooler ) <Except Euro5>.
• Intercooler Inlet Air Hose Installation (Refer to GROUP 15
− Intercooler ) <Euro5>.
• Air Cleaner Assembly Installation (Refer to GROUP 15 −
Air Cleaner ).
• Alternator and Power Steering Oil Pump Drive Belt Ten-
sion Check (Refer to GROUP 11A
− On-vehicle Service,
Alternator and Power Steering Oil Pump Drive Belt Ten-
sion Check ).
• A/C Compressor Drive Belt Tension Check and Adjust-
ment (Refer to GROUP 11A
− On-vehicle Service, A/C
Compressor Drive Belt Tension Check and Adjustment ).
AC503001AC
2
23 ± 2 N·m
1
14 ± 4 N·m
3
44 ± 10 N·m
Removal steps
1.
Alternator connector connection
2.
Alternator terminal connection
<<
A
>>
3.
Alternator assembly
Removal steps (Continued)
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