Mitsubishi Lancer Evolution 7. Manual — part 227
ENGINE ELECTRICAL -
Charging System
16-7
REGULATED VOLTAGE TEST
B
Blue
Red
Ignition
switch
Load
FR
L
S
G
MB991519
Alternator
Battery
Voltmeter
Ammeter
Yellow
Engine-ECU
Black
This test determines whether the voltage regulator
is correctly controlling the alternator output voltage.
(1) Always be sure to check the following before
the test.
D
Alternator installation
D
Check that the battery installed in the
vehicle is fully charged.
(Refer to GROUP 54 - Battery.)
D
Alternator drive belt tension
(Refer to GROUP 11 - On-vehicle Service.)
D
Fusible link
D
Abnormal noise from the alternator 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 (Alternator test harness:
MB991519) to connect a digital voltmeter
between the alternator S terminal and earth.
(Connect the (+) lead of the voltmeter to the
“S” terminal, and then connect the (−) lead of
the voltmeter to a secure earth or to the battery
(−) terminal.)
(5) Disconnect the alternator output wire from the
alternator “B” terminal.
(6) Connect a DC test ammeter with a range of
0 - 100 A in series between the “B” terminal
and the disconnected output wire. (Connect
the (+) lead of the ammeter to the “B” terminal.
Connect the (-) lead of the ammeter to the
disconnected output wire.)
(7) Reconnect the negative battery cable.
(8) Connect a tachometer or the MUT-II. (Refer
to GROUP 11 - On-vehicle Service.)
(9) Turn the ignition switch to the ON position and
check that the reading on the voltmeter is equal
to the battery voltage.
NOTE
If the voltage is 0 V, the cause is probably
an open circuit in the wire or fusible link between
the alternator “S” terminal and the battery (+)
terminal.
(10)Turn all lamps and accessories off.
(11)Start the engine.
(12)Increase the engine speed to 2,500 r/min.
(13)Read the value displayed on the voltmeter when
the
alternator
output
current
alternator
becomes 10 A or less.
ENGINE ELECTRICAL -
Charging System
16-8
(14)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.
(15)After the test, lower the engine speed to the
idle speed.
(16)Turn the ignition switch to the “LOCK” (OFF)
position.
(17)Remove the tachometer or the MUT-II.
(18)Disconnect the negative battery cable.
(19)Disconnect the ammeter and voltmeter.
(20)Connect the alternator output wire to the
alternator “B” terminal.
(21)Remove the special tool, and return the
connector to the original condition.
(22)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
WAVEFORM CHECK USING AN ANALYZER
MEASUREMENT METHOD
Connect the analyzer special patterns pick-up to the alternator
B terminal.
STANDARD WAVEFORM
Observation Conditions
FUNCTION
SPECIAL PATTERNS
PATTERN HEIGHT
VARIABLE
VARIABLE knob
Adjust while viewing the wave-
form.
PATTERN SELECTOR
RASTER
Engine speed
Curb idle speed
Alternator
Special
patterns
pickup
Analyzer
B terminal
ENGINE ELECTRICAL -
Charging System
16-9
Voltage at
alternator
B terminal
0.4
0.2
0
- 0.2
- 0.4
Time
NOTE
The voltage waveform of the alternator B terminal can undulate
as shown at left. This waveform is produced when the regulator
operates according to fluctuations in the alternator load
(current), 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.
ENGINE ELECTRICAL -
Charging System
16-10
EXAMPLES OF ABNORMAL WAVEFORMS
NOTE
1. The size of the waveform patterns differs largely, depending on the adjustment of the variable knob
on the analyzer.
2. Identification of abnormal waveforms is easier when there is a large output current (regulator is not
operating). (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 waveforms
Problem
cause
Abnormal waveforms
Problem
cause
Example 1
Open diode
Example 4
Short in
stator coil
Example 2
Short in diode
Example 5
Open
supplementa-
ry diode
Example 3
Broken wire
in stator coil
At this time, the charging warning lamp
is illuminated.
ALTERNATOR
REMOVAL AND INSTALLATION
Caution
If the vehicle is equipped with the Brembo disc brake, during maintenance, take care not to contact
the parts or tools to the caliper because the paint of caliper will be scratched.
Pre-removal and Post-installation Operation
D
Under Cover Removal and Installation (Refer to GROUP 51 - Front Bumper.)
D
Drive Belt Tension Check (Refer to GROUP 11A - On-vehicle Service.) <After installation only>
D
Strut Tower Bar Removal and Installation (Refer to GROUP 42.)
D
Crossmember Bar Removal and Installation (Refer to GROUP 32 - Engine Roll Stopper, Centermember.)
D
Front Exhaust Pipe Assembly Removal and Installation (Refer to GROUP 15.)
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