Mitsubishi Outlander GS45X. Manual - part 527

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-7

SPECIAL TOOL

M1161000600787

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991958
Scan tool (M.U.T.-III sub 
assembly)

A: MB991824

Vehicle communication 
interface (V.C.I.)

B: MB991827

M.U.T.-III USB cable

C: MB991910

M.U.T.-III main harness A 
(Vehicles with CAN 
communication system)

D: MB991911

M.U.T.-III main harness B 
(Vehicles without CAN 
communication system)

E: MB991914

M.U.T.-III main harness C 
(for Chrysler models only)

F: MB991825

M.U.T.-III measurement 
adapter

G: MB991826

M.U.T.-III trigger harness

MB991824-KIT
NOTE: M.U.T.-III Trigger 
Harness is not necessary 
when pushing V.C.I. 
ENTER key.

Checking of engine 
speed

CAUTION

For vehicles with CAN 
communication, use 
M.U.T.-III main harness 
A to send simulated 
vehicle speed. If you 
connect M.U.T.-III main 
harness B instead, the 
CAN communication 
does not function 
correctly.

MB991519
Generator harness 
connector

MIT530
Micrd 530 charging 
system tester.

Checking of generator 
("S" terminal voltage)

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-8

ON-VEHICLE SERVICE

GENERATOR OUTPUT LINE VOLTAGE DROP TEST

M1161000901532

Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

This test determines whether the wiring from the 
generator "B" terminal to the positive battery terminal 
(including the fusible link) is in good condition or not:

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

• Generator drive belt tension (Refer to GROUP 

00, General 

− Maintenance Service − Drive Belts 

(For Generator, Water Pump, Power Steering Oil 
Pump) (Check Condition) 

P.00-74

.)

• 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 clamp-type DC test ammeter to the 

generator "B" terminal output wire.
NOTE: Disconnecting the generator output wire 
and connecting the ammeter may not thoroughly 
diagnose an alternator output line resistance 
increase problem because of an insufficient con-
nection between terminal "B" and the output wire.

5. Connect a digital-type voltmeter between the 

generator "B" terminal and the positive battery 
terminal. (Connect the positive lead of the 
voltmeter to the "B" terminal, and then connect the 
negative lead of the voltmeter to the positive 
battery cable.)

6. Reconnect the negative battery cable.
7. Connect an engine tachometer or scan tool 

MB991958.

8. Leave the hood open.
9. Start the engine.

AK700033 AB

Generator

Ammeter
(Clamp-type)

Voltmeter
(Digital-type)

"B" terminal

Battery

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-9

10.With the engine running at 2,500 r/min, turn the 

headlights and other lights on and off to adjust the 
generator load so that the value displayed on the 
ammeter is slightly above 30 A.
Read the voltmeter. Voltage reading at or below 
limit value means voltage drop between generator 
and battery is OK.

Limit value: maximum 0.3 V 

NOTE: 
When the generator output is high and the value 
displayed on the ammeter does not decrease to 
30 A, set the value to 40 A. Read the value dis-
played on the voltmeter at this time.
In this case the limit value becomes maximum 0.4 
V.
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.

11.If the value displayed on the voltmeter is above 

the limit value, there is probably a malfunction in 
the generator output wire. Check the wiring 
between the generator "B" terminal and the 
positive 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 lights and turn the ignition switch to the 

"LOCK" (OFF) position.
NOTE: Vehicles for Canada, the headlight, tail-
light, etc. remain lit even when the lighting switch 
is in "OFF" position.

14.Disconnect the engine tachometer or scan tool 

MB991958.

15.Disconnect the negative battery cable.
16.Disconnect the ammeter and voltmeter.
17.Connect the negative battery cable.
18.Run the engine for 10 minutes at an idle.

OUTPUT CURRENT TEST

M1161001001639

AK700034

CAN communication

Genetator

Ammeter (clamp-type)

Voltmeter

ECM

Load

B

FR

L

S

G

Generator
malfunction light

Battery

+

AB

–

Combination meter

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-10

Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

This test determines whether the generator outputs 
normal current. For best results, use a charging sys-
tem tester. If not available, follow the steps below.

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 

P.54A-7

.)

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 

− Maintenance Service − Drive Belts 

(For Generator, Water Pump, Power Steering Oil 
Pump) (Check Condition) 

P.00-74

.)

• 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 clamp-type DC test ammeter to the 

generator "B" terminal output wire. 
NOTE: Disconnecting the generator output wire 
and connecting the ammeter may not thoroughly 
diagnose an output current drop problem because 
of an insufficient connection between terminal "B" 
and the output wire.

5. Connect a voltmeter with a range of 0 

− 20 V 

between the generator "B" terminal and ground. 
(Connect the positive lead of the voltmeter to the 
"B" terminal, and then connect the negative lead 
of the voltmeter to 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 or malfunctioning voltmeter.

10.After turning on the headlights, start the engine.

NOTE: Because the current from the battery will 
soon drop after the engine is started, step 11 
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 
highest 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 or by using the lighting system in 
another vehicle, and then test again.
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.
18.Connect the negative battery cable.
19.Run the engine for 10 minutes at an idle.