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

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ENGINE ELECTRICAL

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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

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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