Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 357

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-5

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,
Ignition switch

P.54A-28

.)

•

Check for burnt-out charging warning light.

•

Check the generator. (Refer to Generator

−

Disassembly and assembly

−

Inspection

P.16-18

.)

•

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 Generator

−

Disassembly and assembly

−

Inspection

P.16-18

.)

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

−

Wave pattern check using a

oscilloscope

P.16-11

.)

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

−

Disassembly and assembly

−

Inspection

P.16-18

.)

STEP 7.

•

Engine: 2,500 r/min

•

Headlight: ON (high beam)

•

Voltage between generator terminal B and the positive
battery terminal
OK: 0.5V or less

•

Voltage between the negative battery terminal and
generator body
OK: 0.5V 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.

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-6

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 Generator

−

Disassembly and assembly

−

Inspection

P.16-18

.)

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 Generator

−

Disassembly and assembly

−

Inspection

P.16-18

.)

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.

ON-VEHICLE SERVICE

GENERATOR OUTPUT LINE VOLTAGE DROP TEST

M1161000900067

Required Special Tool:
MB991502: Scan Tool (MUT-II)
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:
1. Always be sure to check the following before the

test.

•

Generator installation

•

Generator drive belt tension (Refer to GROUP
00, Maintenance Service

−

Drive Belts

P.00-40

.)

•

Fusible link

•

Abnormal noise from the generator while the
engine is running

AKX00185

GENERATOR

AMMETER

VOLTMETER
(DIGITAL-TYPE)

BATTERY

+

-

"B"TERMINAL

AB

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-7

2. Turn the ignition switch to the "LOCK" (OFF)

position.

WARNING

Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.

3. Disconnect the negative battery cable.

4. Disconnect the generator output wire from the

generator "B" terminal and connect a DC test
ammeter with a range of 0

−

100 A in series

between the "B" terminal and the disconnected
output wire. (Connect the positive lead of the
ammeter to the "B" terminal, and then connect the
negative lead of the ammeter to the disconnected
output wire.)

NOTE: A clamp-type ammeter which enables
measurements to be taken without disconnecting
the generator output wire is recommended. If the
voltage may have dropped due to a bad
connection at generator "B" terminal and the
generator "B" terminal is loosened when the test
ammeter is connected, the connection will be
completed at this time and the possibility of
finding the problems will be reduced.

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.)

WARNING

Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.

6. Reconnect the negative battery cable.

7. Connect a tachometer or scan tool MB991502.

8. Leave the hood open.

9. Start the engine.

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.

Limit value: maximum 0.3 V

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

14.Disconnect the tachometer or scan tool

MB991502.

WARNING

Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.

15.Disconnect the negative battery cable.

16.Disconnect the ammeter and voltmeter and

tachometer.

17.Connect the generator output wire to the

generator "B" terminal.

WARNING

Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.

18.Connect the negative battery cable.

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-8

OUTPUT CURRENT TEST

M1161001000067

Required Special Tool:
MB991502: Scan Tool (MUT-II)
This test determines whether the generator outputs
normal current.
1. Before the test, always be sure to check the

following.

•

Generator installation

•

Battery (Refer to GROUP 54A, Battery

−

On-

vehicle Service

−

Battery Check

P.54A-5

.)

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, Maintenance Service

−

Drive Belts

P.00-40

.)

•

Fusible link

•

Abnormal noise from the generator while the
engine is running

2. Turn the ignition switch to the "LOCK" (OFF)

position.

WARNING

Battery posts, terminals and related
accessories contain lead and lead
compounds. WASH HANDS AFTER
HANDLING.

3. Disconnect the negative battery cable.

WARNING

Never use clips to connect the line. Loose
connections (e.g. using clips) will lead to a
serious accident because of high current.

4. Disconnect the generator output wire from the

generator "B" terminal and connect a DC test
ammeter with a range of 0

−

100 A in series

between the "B" terminal and the disconnected
output wire. (Connect the positive lead of the
ammeter to the "B" terminal, and then connect the
negative lead of the ammeter to the disconnected
output wire.)

NOTE: A clamp-type ammeter which enables
measurements to be taken without disconnecting
the generator output wire is recommended.

AKX01214

VOLTMETER

AMMETER

LOAD

CHARGING
WARNING LIGHT

IGNITION
SWITCH

INDICATOR LAMP
(BRAKE WARNING LIGHT, etc.)

BATTERY

+

-

PCM<A/T>

GENERATOR

FR

L

S

G

AC