Mitsubishi Evolution X. Manual — part 238

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-5

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.16-20

.)

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.16-20

.)

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

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ENGINE ELECTRICAL

16-6

SPECIAL TOOL

M1161000600903

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

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 Daimler
Chrysler models only)

F: MB991825

M.U.T.-III
measurement adapter

G: MB991826

M.U.T.-III trigger
harness

MB991824-KIT
NOTE: G: MB991826
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)

MB992226

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-7

ON-VEHICLE SERVICE

GENERATOR OUTPUT LINE VOLTAGE DROP TEST

M1161000901480

AK203361AG

Generator

Ammeter (clamp-type)

Voltmeter (digital-type)

"B" terminal

Battery

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, and Air Conditioning) (Check)

P.00-66

.)

• 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. Set 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
diagnosis an output current drop problem
because of an 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.

MB992226
Serration socket

−

Removal and installation
of alternator’s one way
clutch

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-8

7. Connect an engine tachometer or scan tool

MB991958.

8. Leave the hood open.
9. Start the engine.
10.With the engine running at 2,500 r/min, turn the

headlamps and other lamps on and off to adjust
the generator load so that the value displayed on
the ammeter is slightly above 30 A.
Adjust the engine speed by gradually decreasing
it until the value displayed on the ammeter is 30
A. Take a reading of the valve displayed on the
voltmeter at this time.

Limit: maximum 0.3 V

NOTE: When the generator output is high and the
value displayed on the ammeter does not
decrease until 30 A, set the value to 40 A. Read
the value displayed on the voltmeter at this time.
When the value range is 40 A, the limit is maxi-
mum 0.4 V.

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.Remove the ammeter and voltmeter.
17.Connect the negative battery cable.

OUTPUT CURRENT TEST

M1161001001587

+

–

AK604149

CAN communication

Ammeter (clamp-type)

Voltmeter

ECM

Load

Generator
malfunction light

Battery

+

–

Combination meter

AK604149 AB

Generator

B

FR

L

S

G

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

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable