Mitsubishi Montero (2004+). Manual — part 389
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-11
12.Increase the engine speed to 2,500 r/min.
13.Read the value displayed on the voltmeter when
the current output by the generator becomes 10 A
or less.
14.If the voltage reading is within the value in the
voltage regulation table, then the voltage regulator
is operating normally.
If the voltage is outside the standard value, there
is a malfunction of the voltage regulator or the
generator (Refer to the following table).
15.After the test, lower the engine speed to the idle
speed.
16.Turn the ignition switch to the "LOCK" (OFF)
position.
17.Disconnect the negative battery cable.
18.Disconnect the ammeter, voltmeter and engine
tachometer.
19.Connect the generator output wire to the
generator "B" terminal.
20.Connect the negative battery cable.
VOLTAGE REGULATION TABLE
WAVE PATTERN CHECK USING AN
OSCILLOSCOPE
M1161001200180
.
MEASUREMENT METHOD
Connect the oscilloscope special patterns pick-up to the gener-
ator "B" terminal.
.
STANDARD WAVEFORM
INSPECTION TERMINAL
VOLTAGE REGULATOR
AMBIENT TEMPERATURE [
°C
(
°F)]
STANDARD VALUE (V)
Terminal "S"
−20 (−4)
14.2
− 15.4
20 (68)
13.9
− 14.9
60 (140)
13.4
− 14.5
80 (176)
13.1
− 14.5
AKX00188
GENERATOR
OSCILLOSCOPE
"B" TERMINAL
PROBE
AB
Observation Conditions
FUNCTION
SPECIAL PATTERNS
Pattern height
Variable
Variable knob
Adjust while viewing the wave
pattern
Pattern selector
Raster
Engine revolutions
Curb idle speed
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-12
NOTE: The voltage waveform of the generator "B" terminal can
undulate as shown at left. This waveform is produced when the
regulator operates according to fluctuations in the generator
load (current), and is normal for the generator.
If the ripple height is abnormally high (approximately 2 V or
more during idling), the wires between the generator "B" termi-
nal and the battery have broken due to fuse blowing, etc. The
generator is usually operating properly.
.
ABNORMAL WAVEFORMS EXAMPLES
NOTE: The size of the waveform patterns can differ greatly,
depending on the adjustment of the variable knob on the oscil-
loscope.
NOTE: Identification of abnormal waveforms is easier when
there is a large output current (regulator is not operating).
(Waveforms can be observed when the headlights are illumi-
nated.)
NOTE: Check the conditions of the generator malfunction light
(illuminated/not illuminated) also, and carry out a total check.
ABNORMAL WAVEFORMS
• Example 1
PROBABLE CAUSE: Open circuit in diode
AKX00189
0.4
(V)
0.2
0
–0.2
–0.4
VOLTAGE AT
GENERATOR
"B" TERMINAL
TIME
AB
AKX00190
AKX00191
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-13
• Example 2
PROBABLE CAUSE: Short-circuit in diode
• Example 3
PROBABLE CAUSE: Open circuit in stator coil
• Example 4
PROBABLE CAUSE: Short-circuit in stator coil
AKX00192
AKX00193
AKX00194
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-14
GENERATOR ASSEMBLY
REMOVAL AND INSTALLATION
M1161001400645
Pre-removal Operation
• Under Cover Removal
• Air Cleaner Removal (Refer to GROUP 15, Air Cleaner
.)
Post-installation Operation
• Drive Belt Tension Check (Refer to GROUP 00, Mainte-
nance Service
• Under Cover
• Air Cleaner Installation (Refer to GROUP 15, Air Cleaner
.)
AC204070
1
2
44 ± 10 N·m
33 ± 7 ft-lb
22 ± 4 N·m
16 ± 3 ft-lb
AB
REMOVAL STEPS
1.
DRIVE BELT
2.
GENERATOR
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