Mitsubishi Outlander (2003+). Manual — part 135
CHARGING SYSTEM
ENGINE ELECTRICAL
16-5
SPECIAL TOOLS
M1161000600301
Tool
Number
Name
Use
MB991502
MUT-II sub assembly
Checking the idle speed
MB991955
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826
MUT-III sub assembly
A: Vehicle
communication
interface (V.C.I.)
B: MUT-III USB cable
C: MUT-III main harness
A (Vehicles with CAN
communication
system)
D: MUT-III main harness
B (Vehicles without
CAN communication
system)
E: MUT-III measurement
adapter
F: MUT-III trigger
harness
Checking the idle speed
MB991519
Alternator test harness
Checking the alternator
("S" terminal voltage)
B991502
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
A
B
C
D
E
F
DO NOT USED
CHARGING SYSTEM
ENGINE ELECTRICAL
16-6
ON-VEHICLE SERVICE
ALTERNATOR OUTPUT LINE VOLTAGE DROP TEST
M1161000900380
This test determines whether the wiring from the
alternator "B" terminal to the battery (+) terminal
(including the fusible line) is in a good condition or
not.
1. Always be sure to check the following before the
test.
•
Alternator installation
•
Drive belt tension
, GROUP 11A
−
On-Vehicle
Service.) <4G63>
, GROUP 11C
−
On-Vehicle
Service.) <4G69>
•
Fusible link
•
Abnormal noise from the alternator while the
engine is running
2. Turn the ignition switch to the "LOCK" (OFF)
position.
3. Disconnect the negative battery cable.
4. Connect a clamp-type DC test ammeter with a
range of 0
−
150 A to the alternator "B" terminal
output wire.
NOTE: The way of disconnecting the alternator
output wire and of connecting the ammeter is
possibly not found the problem that the output
current is dropping due to the insufficient
connection between terminal "B" and the output
wire.
5. Connect a digital-type voltmeter between the
alternator "B" terminal and the battery (+)
terminal. [Connect the (+) lead of the voltmeter to
the "B" terminal and the connect the (-) lead of the
voltmeter to the battery (+) cable].
6. Reconnect the negative battery cable.
7. Connect the MUT-II/III
8. Leave the hood open.
9. Start the engine.
10.With the engine running at 2,500 r/min, turn the
headlamps and other lamps on and off to adjust
the alternator load so that the value displayed on
the ammeter is slightly above 30 A.
Adjust the engine speed by gradually decreasing
it until the value displayed on the ammeter is 30
A. Take a reading of the value displayed on the
voltmeter at this time.
Limit: maximum 0.3 V
NOTE: When the alternator output is high and the
value displayed on the ammeter does not
decrease until 30 A, set the value to 40 A. Read
the value displayed on the voltmeter at this time.
When the value range is 40 A, the limit is
maximum 0.4 V.
AK203361AD
Alternator
Ammeter (clamp-type)
Voltmeter (digital-type)
"B" terninal
Battery
CHARGING SYSTEM
ENGINE ELECTRICAL
16-7
11.If the value displayed on the voltmeter is above
the limit value, there is probably a malfunction in
the alternator output wire, so check the wiring
between the alternator "B" terminal and the
battery (+) terminal (including fusible link).
If a terminal is not sufficiently tight or if the
harness has become discolored due to
overheating, repair and then test again.
12.After the test, run the engine at idle.
13.Turn off all lamps.
14.Turn the ignition switch to the "LOCK" (OFF)
position.
15.Remove the MUT-II/III.
16.Disconnect the negative battery cable.
17.Disconnect the ammeter and voltmeter.
18.Connect the negative battery cable.
OUTPUT CURRENT TEST
M1161001000409
This test determines whether the alternator output
current is normal.
1. Before the test, always be sure to check the
following.
•
Alternator installation
•
, GROUP 54A
−
Battery
−
On-Vehicle Service.)
NOTE: The battery should be slightly discharged.
The load needed by a fully-charged battery is
insufficient for an accurate test.
•
Drive belt tension
(Refer to
, GROUP 11A
−
On-Vehicle
Service.) <4G63>
(Refer to
, GROUP 11C
−
On-Vehicle
Service.) <4G69>
•
Fusible link
•
Abnormal noise from the alternator while the
engine is running.
2. Turn the ignition switch to the "LOCK" (OFF)
position.
3. Disconnect the negative battery cable.
AK304240
Alternator
Ammeter
(clamp-type)
Voltmeter
Battery
Ignition switch
Engine-ECU
<M/T> or
Engine-A/T-ECU
<A/T>
Load
B
FR
L
S
G
+
AB
–
Charging indicator
CHARGING SYSTEM
ENGINE ELECTRICAL
16-8
CAUTION
Never use clips but tighten bolts and nuts to
connect the line. Otherwise loose connections
(e.g. using clips) will lead to a serious accident
because of high current.
4. Connect a clamp-type DC test ammeter with a
range of 0
−
150 A to the alternator "B" terminal
output wire.
NOTE: The way of disconnecting the alternator
output wire and of connecting the ammeter is
possibly not found the problem that the output
current is dropping due to the insufficient
connection between terminal "B" and the output
wire.
5. Connect a voltmeter with a range of 0
−
20 V
between the alternator "B" terminal and the earth
[Connect the (+) lead of the voltmeter to the "B"
terminal, and then connect the (-) lead of the
voltmeter to the earth].
6. Connect the negative battery cable.
7. Connect the MUT-II/III
8. Leave the hood open.
9. Check that the reading on the voltmeter is equal
to the battery voltage.
NOTE: If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the alternator "B" terminal and the battery (+)
terminal.
10.Turn the light switch on to turn on headlamps and
then start the engine.
11.Immediately after setting the headlamps 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: 70 % of normal current output
NOTE:
.
•
For the nominal current output, refer to the
Alternator Specifications.
•
Because the current from the battery will soon
drop after the engine is started, the above step
should be carried out as quickly as possible in
order to obtain the maximum current output
value.
•
The current output value will depend on the
electrical load and the temperature of the
alternator body.
•
If the electrical load is small while testing, the
specified level of current may not be output
even though the alternator is normal. In such
cases, increase the electrical load by leaving
the headlamps turned on for some time to
discharge the battery or by using the lighting
system in another vehicle, and then test again.
•
The specified level of current also may not be
output if the temperature of the alternator body
or the ambient temperature is too high. In such
cases, cool the alternator 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 alternator output wire is normal, remove
the alternator from the engine and check the
alternator.
13.Run the engine at idle after the test.
14.Turn the ignition switch to the "LOCK" (OFF)
position.
15.Remove the MUT-II/III.
16.Disconnect the negative battery cable.
17.Disconnect the ammeter and voltmeter.
18.Connect the negative battery cable.
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