Mitsubishi Colt Ralliart. Manual — part 119

CHARGING SYSTEM

ENGINE ELECTRICAL

16-10

9. Turn all lamps and accessories off.
10.Start the engine.
11.Increase the engine speed to 2,500 r/min.
12.Read the value displayed on the voltmeter when

the alternator output current alternator becomes
10 A or less.

13.If the voltage reading conforms to the value in the

voltage regulation, then the voltage regulator is
operating normally.
If the voltage is not within the standard value,
there is a malfunction of the voltage regulator or of
the alternator.

14.After the test, lower the engine speed to the idle

speed.

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

position.

16.Remove the M.U.T.-III.
17.Disconnect the negative battery cable.
18.Disconnect the ammeter and voltmeter.
19.Connect the alternator output wire to the

alternator "B" terminal.

20.Remove the special tool, and return the connector

to the original condition.

21.Connect the negative battery cable.

Voltage Regulation Table

Standard value:

Inspection terminal

Voltage regulator ambient
temperature

°C

Voltage V

Terminal "S"

−20

14.2

− 15.4

20

13.9

− 14.9

60

13.4

− 14.6

80

13.1

− 14.5

Main

Index

Group

TOC

CHARGING SYSTEM

ENGINE ELECTRICAL

16-11

WAVEFORM CHECK USING AN OSCILLOSCOPE

M1161001200373

MEASUREMENT METHOD

AK100002

Alternator

"B" terminal

CH1

AC

Connect the oscilloscope special patterns pick-up to
the alternator "B" terminal.

STANDARD WAVEFORM

Observation Conditions

Function

Special pattern

Pattern height

Variable

Variable knob

Adjust while viewing the waveform.

Pattern selector

Raster

Engine speed

Curb idle speed

AKX00189

0.4

(V)

0.2

0

–0.2

–0.4

Voltage at
alternator
"B" terminal

Time

AG

NOTE:

AKX00190

The voltage waveform of the alternator "B" terminal
can undulate as shown in the illustration. This wave-

form is produced when the regulator operates
according to fluctuations in the alternator load (cur-
rent), and is normal for the alternator. In addition,
when the voltage waveform reaches an excessively
high value (approximately 2 V or higher at idle), it
often indicates an open circuit due to a brown fuse
between alternator "B" terminal and battery, but not a
defective alternator.

Main

Index

Group

TOC

CHARGING SYSTEM

ENGINE ELECTRICAL

16-12

EXAMPLE OF ABNORMAL WAVEFORMS

NOTE:

.

1. The size of the waveform patterns differs largely, depending on the adjustment of the variable knob on the

oscilloscope.

2. Identification of abnormal waveforms is easier when there is a large output current (regulator is not oper-

ating). (Waveforms can be observed when the headlamps are illuminated.)

3. Check the conditions of the charging warning lamp (illuminated/not illuminated). Also, check the charging

system totally.

Abnormal waveform

Problem cause

Example 1

AKX00191

Open diode

Example 2

AKX00192

Short in diode

Example 3

AKX00193

Broken wire in
stator coil

Example 4

AKX00194

Short in stator
coil

Main

Index

Group

TOC

CHARGING SYSTEM

ENGINE ELECTRICAL

16-13

ALTERNATOR ASSEMBLY

REMOVAL AND INSTALLATION <4A9>

M1161001401637

Pre-removal Operation
• Engine Cover Removal (Refer to GROUP 11A, Camshaft

P.11A-17

).

• Front Under Cover Panel Removal (Refer to GROUP 51,

Front Bumper Assembly and Radiator Grille

P.51-2

).

• Engine Coolant Draining (Refer to GROUP 14, On-vehicle

Service

− Engine Coolant Replacement

P.14-4

).

• Radiator Lower Hose Removal (Refer to GROUP 14,

Radiator

P.14-22

).

• Drive Belt Removal (Refer to GROUP 11A, Crankshaft

Pulley

P.11A-14

).

Post-installation Operation
• Drive Belt Installation (Refer to GROUP 11A, Crankshaft

Pulley

P.11A-14

).

• Radiator Lower Hose Installation (Refer to GROUP 14,

Radiator

P.14-22

).

• Engine Coolant Refilling (Refer to GROUP 14, On-vehicle

Service

− Engine Coolant Replacement

P.14-4

).

• Drive Belt Tension Check and Adjustment (Refer to

GROUP 11A, On-Vehicle Service

− Drive Belt Tension

Check and Adjustment

P.11A-6

).

• Front Under Cover Panel Installation (Refer to GROUP

51, Front Bumper Assembly and Radiator Grille

P.51-2

).

• Engine Cover Installation (Refer to GROUP 11A, Cam-

shaft

P.11A-17

).

AC403865AB

6

14 ± 3 N·m

36 ± 3 N·m

23 ± 2 N·m

47 ± 5 N·m

3

2

1

5

4

5.0 ± 1.0 N·m

5.0 ± 1.0 N·m

11 ± 1 N·m

Removal steps

1.

Alternator connector

2.

Alternator terminal

3.

Noise condenser

4.

Earth connection

5.

Alternator brace

<<

A

>>

6.

Alternator assembly

REMOVAL SERVICE POINT
<<A>> ALTERNATOR ASSEMBLY
REMOVAL

Remove the alternator assembly from above the
vehicle.

Removal steps (Continued)

Main

Index

Group

TOC