Mitsubishi Montero Sport (2004+). Manual — part 92
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-9
WARNING
Battery posts, terminals and related acces-
sories contain lead and lead compounds.
WASH HANDS AFTER HANDLING.
1. Before the test, always be sure to check the
following.
• Generator installation
• Battery (Refer to GROUP 54A, Chassis Electrical
− Battery − On-vehicle Service − Battery Check
NOTE: The battery to be used should be slightly
discharged. The load in a fully-charged battery
will be insufficient and the test may not be able to
be carried out correctly.
• Generator drive belt tension (Refer to GROUP
00, General <Body and Chasis>
− Maintenance
Service
− 8. Drive Belt (For Generator and Water
Pump, Power Steering Pump) (Check Condition)
.)
• Fusible link
• Abnormal noise from the generator while the
engine is running
2. Turn the ignition switch to the "LOCK" (OFF)
position.
3. Disconnect the negative battery cable.
WARNING
Never use clips to connect the line. Loose
connections (e.g. using clips) will lead to a
serious accident because of high current.
4. Disconnect the generator output wire from the
generator "B" terminal and connect a DC test
ammeter with a range of 0
− 100 A in series
between the "B" terminal and the disconnected
output wire. (Connect the positive lead of the
ammeter to the "B" terminal, and then connect the
negative lead of the ammeter to the disconnected
output wire.)
NOTE: A clamp-type ammeter which enables
measurements to be taken without disconnecting
the generator output wire is recommended.
5. Connect a voltmeter with a range of 0
− 20 V
between the generator "B" terminal and the
ground. (Connect the positive lead of the
voltmeter to the "B" terminal, and then connect the
negative lead of the voltmeter to the ground.)
6. Connect the negative battery cable.
7. Connect an engine tachometer or scan tool
MB991958.
8. Leave the hood open.
9. Check to be sure that the reading on the voltmeter
is equal to the battery positive voltage.
NOTE: If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the generator "B" terminal and the battery positive
terminal.
10.After turning the light switch on and turning on the
headlights, start the engine.
NOTE: Because the current from the battery will
soon drop after the engine is started, step11
should be carried out as quickly as possible in
order to obtain the maximum current output value.
11.Immediately after setting the headlights to high
beam and turning the heater blower switch to the
high revolution position, increase the engine
speed to 2,500 r/min and read the maximum
current output value displayed on the ammeter.
Limit value: 70 % of nominal current output
NOTE: For the nominal current output, refer to the
Generator Specifications
NOTE: The current output value will depend on
the electrical load and the temperature of the gen-
erator body.
NOTE: If the electrical load is small while testing,
the specified level of current may not be output
even though the generator is normal. In such
cases, increase the electrical load by leaving the
headlights turned on for some time to discharge
the battery.
NOTE: The specified level of current also may not
be output if the temperature of the generator body
or the ambient temperature is too high. In such
cases, cool the generator and then test again.
12.The reading on the ammeter should be above the
limit value. If the reading is below the limit value
and the generator output wire is normal, remove
the generator from the engine and check the
generator.
13.Run the engine at idle speed after the test.
14.Turn the ignition switch to the "LOCK" (OFF)
position.
15.Disconnect the engine tachometer or scan tool
MB991958.
16.Disconnect the negative battery cable.
17.Disconnect the ammeter and voltmeter and
engine tachometer.
18.Connect the generator output wire to the
generator "B" terminal.
19.Connect the negative battery cable.
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-10
REGULATED VOLTAGE TEST
M1161001100365
Required Special Tool:
MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
This test determines whether the voltage regulator is
correctly controlling the generator output voltage.
WARNING
Battery posts, terminals and related acces-
sories contain lead and lead compounds.
WASH HANDS AFTER HANDLING.
1. Always be sure to check the following before the
test:
• Generator installation
• Check to be sure that the battery installed in the
vehicle is fully charged (Refer to GROUP 54A,
Chassis Electrical
− Battery − On-vehicle Service
− Battery Check
• Generator drive belt tension (Refer to GROUP
00, General <Body and Chasis>
− Maintenance
Service
− 8. Drive Belt (For Generator and Water
Pump, Power Steering Pump) (Check Condition)
.)
• Fusible link
• Abnormal noise from the generator while the
engine is running
2. Turn the ignition switch to the "LOCK" (OFF)
position.
3. Disconnect the negative battery cable.
4. Connect a digital-type voltmeter between the
generator "S" terminal and the ground. (Connect
the positive lead of the voltmeter to the "S"
terminal, and then connect the negative lead of
the voltmeter to a secure ground or to the battery
negative terminal.)
5. Disconnect the generator output wire from the
generator "B" terminal.
6. Connect a DC test ammeter with a range of 0
−
100 A in series between the "B" terminal and the
disconnected output wire. (Connect the positive
load of the ammeter to the "B" terminal, and then
connect the negative lead of the ammeter to the
disconnected output wire.)
7. Connect the negative battery cable.
8. Connect an engine tachometer or the scan tool
MB991958.
9. Turn the ignition switch to the "ON" position and
check that the reading on the voltmeter is equal to
the battery positive voltage.
NOTE: If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the generator "S" terminal and the battery positive
terminal.
10.Check to be sure that all lights and accessories
are off.
11.Start the engine.
12.Increase the engine speed to 2,500 r/min.
AKX00187
IGNITION
SWITCH
GENERATOR
MALFUNCTION LIGHT
BRAKE WARNING LIGHT
GENERATOR
AMMETER
VOLTMETER
(DIGITAL-TYPE)
LOAD
L
S
B
BATTERY
+
+
+
-
-
-
AD
CHARGING SYSTEM
TSB Revision
ENGINE ELECTRICAL
16-11
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 conforms to 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
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