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