Mitsubishi Eclipse. Manual - part 665

 

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Mitsubishi Eclipse. Manual - part 665

 

 

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-3

CHARGING SYSTEM

GENERAL DESCRIPTION

M1161000100328

The charging system charges the battery with the 
generator output to keep the battery charged at a 
constant level during varying electrical load.

OPERATION 

Rotation of the excited field coil generates AC volt-
age in the stator.
This alternating current is rectified through diodes to 
DC voltage having a waveform shown in the illustra-
tion at left.
The average output voltage fluctuates slightly with 
the generator load condition.

When the ignition switch is turned on, current flows in 
the field coil and initial excitation of the field coil 
occurs.
When the stator coil begins to generate power after 
the engine is started, the field coil is excited by the 
output current of the stator coil.
The generator output voltage rises as the field cur-
rent increases and it falls as the field current 
decreases. When the battery positive voltage (gener-
ator S terminal voltage) reaches a regulated voltage 
of approximately 14.4 V, the field current is cut off. 
When the battery positive voltage drops below the 
regulated voltage, the voltage regulator regulates the 
output voltage to a constant level by controlling the 
field current.
In addition, when the field current is constant, the 
generator output voltage rises as the engine speed 
increases.

CHARGING SYSTEM DIAGNOSIS

M1161000700212

TROUBLESHOOTING HINTS

Charging warning light dose not go on when the ignition switch 

is turned to ON, before the engine starts.

• Check the bulb.

AKX00183

VOLTAGE

TIME

APPROXIMATELY
14.4 V

AB

AK301527

GENERATOR

<2.4L ENGINE (FEDERAL AND CALIFORNIA - M/T)>

B

STATOR 
COIL

CHARGING 
WARNING 
LIGHT

IGNITION 
SWITCH

BATTERY

FIELD COIL

GENERATOR

<2.4L ENGINE (FEDERAL AND CALIFORNIA - A/T, CANADA), 
  3.0L ENGINE>

B

STATOR 
COIL

ECM<M/T>
PCM<A/T>

ECM

CHARGING 
WARNING 
LIGHT

IGNITION 
SWITCH

FIELD COIL

BATTERY

AB

G

S

L

FR

+

VOLTAGE REGULATOR

G

S

L

FR

VOLTAGE REGULATOR

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-4

Charging warning light dose not switch off after the engine 

starts.

• Check the IC voltage regulator inside the generator.

Discharged or overcharged battery.

• Check the IC voltage regulator inside the generator.

The charging warning light illuminates dimly.

• Check the diode (inside the combination meter) for a 

short-circuit.

TROUBLESHOOTING GUIDE

The charging system troubleshooting guide is shown in the fol-
lowing steps.

STEP 1.
Q: Is the battery in good condition? (Refer to GROUP 54A, 

Chassis Electrical 

 Battery  On-vehicle Service  

Battery Check 

P.54A-5

.)

YES : Go to Step 2.
NO :  Charge or replace the battery.

STEP 2.
Q: Is the generator drive belt in good condition? (Refer to 

GROUP 00, General 

 Maintenance Service  9. Drive 

Belt (For the Generator, Water Pump and Power 
Steering Pump) (Check Condition) 

P.00-46

.)

YES : Go to Step 3.
NO :  Adjust the belt tension or replace the belt.

STEP 3.
Q: Does the charging warning light brightly when the 

ignition switch is turned on?
YES : 
Go to Step 4.
NO : 

• Check the ignition switch. (Refer to GROUP 54A, 

Chassis Electrical 

− Ignition Switch − Ignition 

Switch 

− Inspection 

P.54A-43

.)

• Check for burnt-out charging warning light.

• Check the generator. (Refer to Charging System − 

Generator Assembly 

− Inspection 

P.16-19

.)

• Check the charging warning light-related circuits.

STEP 4.
Q: Does the charging warning light go out after starting the 

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

− 

Generator Assembly 

− Inspection 

P.16-19

.)

STEP 5.
Q: Is an oscilloscope available?

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

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-5

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.16-11

.) 

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

− 

Generator Assembly 

− Inspection 

P.16-19

.)

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.16-8

.)

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

− 

Generator Assembly 

− Inspection 

P.16-19

.)

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

System 

 On-vehicle Service  Regulated Voltage Test 

P.16-10

.)

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

− 

Generator Assembly 

− Inspection 

P.16-19

.)

STEP 10.
Q: Is the voltage drops in the generator output line 

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

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-6

SPECIAL TOOL

M1161000600259

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

MB991958
A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: 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 Main Harness 
C (for Chrysler models 
only)
F: MUT-III Adapter 
Harness
G: MUT-III Trigger 
Harness

Tool not available

Checking of engine idle 
speed

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

 

 

 

 

 

 

 

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