Mitsubishi Outlander GS45X. Manual — part 528

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-11

REGULATED VOLTAGE TEST

M1161001102424

Required Special Tools:

• 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

• MB991519: Generator Harness Connector

This test determines whether the voltage regulator is
correctly controlling the generator output voltage.

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

• Check to be sure that the battery installed in the

vehicle is fully charged. (Refer to GROUP 54A,
Chassis Electrical

− Battery − On-vehicle Service

− Battery Check

P.54A-7

.)

• Generator drive belt tension (Refer to GROUP

00, General

− Maintenance Service − Drive Belts

(For Generator, Water Pump, Power Steering Oil
Pump) (Check Condition)

P.00-74

.)

• 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. Use the special tool (Generator harness

connector: MB991519) to connect a digital-type
voltmeter between the generator "S" terminal and
ground. (Connect the positive lead of the
voltmeter to the "S" terminal, and then connect the
negative lead of the voltmeter to a secure ground
or to the negative battery terminal.)

5. Connect a clamp-type DC test ammeter to the

generator "B" terminal output wire.

6. Reconnect the negative battery cable.
7. Connect an engine tachometer, or scan tool

MB991958.

8. Turn the ignition switch to the "ON" position and

check that the reading on the voltmeter is equal to
the battery positive voltage.
NOTE: If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the generator "S" terminal and the battery positive
terminal or malfunctioning voltmeter.

AK700035 AB

Battery

CAN communication

Ammeter (clamp-type)

Load

Blue

MB991519

Voltmeter (digital-type)

Yellow

Red

Black

Generator

B

FR

L

S

G

Generator
malfunction light

Combination meter

+

+

ECM

–

–

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-12

9. Check to be sure that all lights and accessories

are off.

10.Start the engine.

NOTE: Do not drive the vehicle after the engine
starts.

11.Increase the engine speed to 2,500 r/min.
12.Read the value displayed on the voltmeter when

the current output by the generator becomes 15 A
or less.

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.Remove the special tool (Generator harness

connector: MB991519), and return the connector
to the original condition.

20.Connect the negative battery cable.
21.Run the engine for 10 minutes at an idle.

VOLTAGE REGULATION TABLE

WAVE PATTERN CHECK USING AN
OSCILLOSCOPE

M1161001200793

.

MEASUREMENT METHOD

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

.

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

− 14.6

80 (176)

13.1

− 14.5

AK700012

CH1

AB

"B" terminal

Generator

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-13

STANDARD WAVEFORM

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.

.

Observation Conditions

FUNCTION

SPECIAL PATTERNS

Pattern height

Variable

Variable knob

Adjust while viewing the
wave pattern

Pattern selector

Raster

Engine revolutions

Curb idle speed

AK700036

0.4

(V)

0.2

0

–0.2

–0.4

Voltage at
generator
"B" terminal

Time

AB

AKX00190

CHARGING SYSTEM

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ENGINE ELECTRICAL

16-14

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

• Example 2

PROBABLE CAUSE: Short-circuit in diode

• Example 3

PROBABLE CAUSE: Open circuit in stator coil

AK700038

AK700039

AK700040