Mitsubishi Galant (2004+). Manual — part 166

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-5

STEP 4.
Q: Does the generator malfunction light go out after

starting the engine?
YES : Go to Step 5.
NO : Check the generator (Refer to Charging System

−

Generator Assembly

− Inspection

P.16-20

.)

STEP 5.
Q: Is an oscilloscope available?

YES : Go to Step 6.
NO : Go to Step 7.

STEP 6.
Q: Dose the oscilloscope show a normal wave pattern?

(Refer to Charging System

− On-vehicle Service − Wave

Pattern Check Using an Oscilloscope

P.16-12

.)

YES : Go to Step 7.
NO : Check the generator. (Refer to Charging System

−

Generator Assembly

− Inspection

P.16-20

.)

STEP 7.

• Engine: 2,500 r/min

• Headlight: ON (high beam)

• Voltage between generator terminal B and the positive bat-

tery terminal
OK: 0.5 V or less

• Voltage between the negative battery terminal and genera-

tor body
OK: 0.5 V or less

Q: Are the generator output line and ground line in good

condition?
YES : Go to Step 8.
NO : Check the generator output line and ground line.

STEP 8.
Q: Is the output current normal? (Refer to Charging

System

− On-vehicle Service − Output Current Test

P.16-9

.)

YES : Go to Step 9.
NO : Check the generator (Refer to Charging System

−

Generator Assembly

− Inspection

P.16-20

.)

STEP 9.
Q: Is the regulated voltage normal? (Refer to Charging

System

− On-vehicle Service − Regulated Voltage Test

P.16-11

.)

YES : Go to Step 10.
NO : Check the generator (Refer to Charging System

−

Generator Assembly

− Inspection

P.16-20

.)

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-6

STEP 10.
Q: Is the voltage drop in the generator output line normal?

YES : Generator is normal. Check other systems.
NO : Check the output line.

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-7

SPECIAL TOOL

M1161000600260

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991958
Scan tool (MUT-III sub
assembly)

A: MB991824

Vehicle
communication
interface (V.C.I.)

B: MB991827

MUT-III USB cable

C: MB991910

MUT-III main harness
A (Vehicles with CAN
communication
system)

D: MB991911

MUT-III main harness
B (Vehicles without
CAN communication
system)

E: MB991914

MUT-III main harness
C (for Daimler Chrysler
models only)

F: MB991825

MUT-III measurement
adapter

G: MB991826

MUT-III trigger
harness

MB991824-KIT
NOTE: G: MB991826
MUT-III Trigger Harness
is not necessary when
pushing V.C.I. ENTER
key.

Checking of engine idle
speed

CAUTION

For vehicles with CAN
communication, use
MUT-III main harness A
to send simulated
vehicle speed. If you
connect MUT-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

M1161000900368

Required Special Tool:
MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-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 − 8. Drive

Belts (For Generator, Power Steering Pump and
Air Conditioning) (Check)

P.00-43

.)

• 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 with a

range of 0

− 100 A to the generator "B" terminal

output wire.
NOTE: The way of disconnecting the generator
output wire and of connecting the ammeter is pos-
sibly 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

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.

AK203361AC

GENERATOR

AMMETER
(CLAMP-TYPE)

VOLTMETER
(DIGITAL-TYPE)

"B" TERMINAL

BATTERY