Mitsubishi Lancer Evolution X. Manual - part 93

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-3

GENERAL SPECIFICATIONS

M1161000200518

SERVICE SPECIFICATIONS

M1161000301024

CHARGING SYSTEM DIAGNOSIS

M1161000700535

TROUBLESHOOTING HINTS

Generator malfunction light does not go on when the ignition 

switch is turned to ON, before the engine starts.

• Check the generator malfunction light.

Generator malfunction light does 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.

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 Test 

P.54A-9

.)

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

Item

Specification

Type

Battery positive voltage sensing

Identification number

A3TL0081

Part No.

1800A155

Rated output V/A

12/130

Voltage regulator

Electronic built-in type

Item

Standard value

Limit

Regulated voltage
(Ambient temperature at 
voltage regulator)

− 20° C (− 4° F)

14.2 − 15.4

−

20° C (68° F)

13.9 − 14.9

−

60° C (140° F)

13.4 − 14.6

−

80° C (176° F)

13.1 − 14.5

−

Generator output line voltage drop (at 30 A) V

−

Maximum 0.3

Output current

−

70 % of normal output 
current

Field coil resistance Ω

Approximately 2 − 5

−

Brush protrusion length mm (in)

−

Minimum 2 (0.08)

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-4

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

GROUP 00, General − Maintenance Service − Drive Belts 

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

P.00-64

.)

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

STEP 3.
Q: Does the generator malfunction light come on 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-25

).

Check the generator malfunction light and its related 

circuits.

Check the generator. (Refer to Charging System − 

Generator Assembly − Inspection 

P.16-20

).

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: Does 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.16-20

.)

CHARGING SYSTEM

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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

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 
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)

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE