Mitsubishi Galant 9G. Manual — part 354

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-12

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

voltage regulation table, then the voltage regulator
is operating normally.
If the voltage is outside the standard value, there
is a malfunction of the voltage regulator or the
generator (Refer to the following table).

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

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

position.

16.Disconnect the engine tachometer or scan tool

MB991958.

17.Disconnect the negative battery cable.
18.Disconnect the ammeter and voltmeter.
19.Connect the negative battery cable.
20.Run the engine for 10 minutes at an idle.

VOLTAGE REGULATION TABLE

WAVE PATTERN CHECK USING AN
OSCILLOSCOPE

M1161001200180

.

MEASUREMENT METHOD

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

.

STANDARD WAVEFORM

INSPECTION TERMINAL

VOLTAGE REGULATOR
AMBIENT TEMPERATURE [

°C

(

°F)]

STANDARD VALUE (V)

Terminal "S"

−20 (−4)

14.2

− 15.4

20 (68)

13.9

− 14.9

60 (140)

13.4

− 14.5

80 (176)

13.1

− 14.2

AKX00188

GENERATOR

OSCILLOSCOPE

"B" TERMINAL

PROBE

AB

Observation Conditions

FUNCTION

SPECIAL PATTERNS

Pattern height

Variable

Variable knob

Adjust while viewing the wave
pattern

Pattern selector

Raster

Engine revolutions

Curb idle speed

CHARGING SYSTEM

TSB Revision

ENGINE ELECTRICAL

16-13

NOTE: The voltage waveform of the generator "B" terminal can
undulate as shown at left. This waveform is produced when the
regulator operates according to fluctuations in the generator
load (current), and is normal for the generator.
If the ripple height is abnormally high (approximately 2 V or
more during idling), the wires between the generator "B" termi-
nal and the battery have broken due to fuse blowing, etc. The
generator is usually operating properly.

.

ABNORMAL WAVEFORMS EXAMPLES

NOTE: The size of the waveform patterns can differ greatly,
depending on the adjustment of the variable knob on the oscil-
loscope.
NOTE: Identification of abnormal waveforms is easier when
there is a large output current (regulator is not operating).
(Waveforms can be observed when the headlights are illumi-
nated.)
NOTE: Check the conditions of the generator malfunction light
(illuminated/not illuminated) also, and carry out a total check.

ABNORMAL WAVEFORMS

• Example 1

PROBABLE CAUSE: Open circuit in diode

AKX00189

0.4

(V)

0.2

0

–0.2

–0.4

VOLTAGE AT
GENERATOR
"B" TERMINAL

TIME

AB

AKX00190

AKX00191

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-14

• Example 2

PROBABLE CAUSE: Short-circuit in diode

• Example 3

PROBABLE CAUSE: Open circuit in stator coil

• Example 4

PROBABLE CAUSE: Short-circuit in stator coil

AKX00192

AKX00193

AKX00194

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-15

GENERATOR ASSEMBLY

REMOVAL AND INSTALLATION <2.4L ENGINE>

M1161001400913

Pre-removal Operation
• Side Under Cover Removal (Refer to GROUP 51, Under

Cover

P.51-11

).

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

Pulley

P.11A-27

).

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

Pulley

P.11A-27

).

• Drive Belt Tension Check (Refer to GROUP 11A, On-vehi-

cle Service

− Drive Belt Tension Check

P.11A-8

).

• Side Under Cover Installation (Refer to GROUP 51,

Under Cover

P.51-11

).

AC306712AB

49 ± 9 N·m
36 ± 7 ft-lb

1

4

3

2

11 ± 1 N·m
98 ± 8 in-lb

12 ± 2 N·m
102 ± 22 in-lb

14 ± 1 N·m
120 ± 13 in-lb

44 ± 10 N·m
33 ± 7 ft-lb

49 ± 9 N·m
36 ± 7 ft-lb

49 ± 9 N·m
36 ± 7 ft-lb

REMOVAL STEPS

1.

HARNESS BRACKET

2.

CONNECTOR BRACKET

<<A>>

3.

GENERATOR ASSEMBLY

•

TIMING BELT LOWER COVER
(REFER TO GROUP 11A, TIMING
BELT

P.11A-51

).

4.

GENERATOR MOUNTING
BRACKET

REMOVAL STEPS (Continued)