Mitsubishi Lancer. Manual — part 204
CHARGING SYSTEM
ENGINE ELECTRICAL
16-8
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 tachometer or the M.U.T.-II/III.
17.Disconnect the negative battery cable.
18.Disconnect the ammeter and voltmeter.
19.Connect the alternator output wire to the
alternator "B" terminal.
20.Remove the special tool, and return the connector
to the original condition.
21.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
CHARGING SYSTEM
ENGINE ELECTRICAL
16-9
WAVEFORM CHECK USING AN OSCILLOSCOPE
M1161001200124
MEASUREMENT METHOD
AK100002
Alternator
"B" terminal
CH1
AC
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
AKX00189
0.4
(V)
0.2
0
–0.2
–0.4
Voltage at
alternator
"B" terminal
Time
AG
NOTE:
AKX00190
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.
CHARGING SYSTEM
ENGINE ELECTRICAL
16-10
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
Example 1
AKX00191
Open diode
Example 2
AKX00192
Short in diode
CHARGING SYSTEM
ENGINE ELECTRICAL
16-11
Example 3
AKX00193
Broken wire in
stator coil
Example 4
AKX00194
Short in stator
coil
Example 5
AKX00195
At this time, the charging warning lamp is illuminated.
Open
supplementary
diode
Abnormal waveform
Problem cause
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