2006 MITSUBISHI LANCER Workshop Manual

CHARGING SYSTEM
ENGINE ELECTRICAL16-3
SERVICE SPECIFICATIONS
M1161000300258
ItemStandard valueLimit
Alternator output line voltage drop (at 30 A) V−maximum 0.3
Regulated voltage ambient
temperature at voltage regulator V−20°C14.2 − 15.4−
20°C13.9 − 14.9−
60°C13.4 − 14.6−
80°C13.1 − 14.5−
Output current−70 % of normal output current
SPECIAL TOOLM1161000600163
ToolNumberNameUse
MB991519Alterna t or test harn e ssChec king th e alt e rnator
("S" te rminal volt age )
ON-VEHICLE SERV ICE
ALTERNA T O R OUTPUT LINE VOL T AGE DROP TEST
M1161 0009 0034 6
AK203361AD
Alternator Ammeter (clamp-type)
Voltmeter (digital-type)
"B" terminal Battery
This test
determine s whethe r the wiring fro m th e
altern
ator "B" termina l to t he batt e ry (+) terminal
(including the
fusible line ) is in a good condition or
not.
1.Always b e su re to check the following b e fore th e
te st.
•Alternator inst allatio n
•Drive belt tension
(Ref er to GROUP 1 1 A − On-veh icle Service <4G1>
P.11A-7 or GROUP 1 1 C − On-vehicle Service
<4G6> P.11C-7.)
•Fusible link
•Abnormal noise from the altern ator while the
eng
ine is ru nning

CHARGING SYSTEM
ENGINE ELECTRICAL16-4
2. Turn the ignition switch to the "LOCK" (OFF)
position.
3. Disconnect the negative battery cable.
4. Connect a clamp-type DC test ammeter with a
range of 0
− 120 A to the alternator "B" terminal
output wire.
NOTE: The way of disconnecting the alternator
output wire and of connecting the ammeter is pos
-
sibly not found the problem that the output current
is dropping due to the insufficient connection
between terminal "B" and the output wire.
5. Connect a digital-type voltmeter between the
alternator "B" terminal and the battery (+)
terminal. [Connect the (+) lead of the voltmeter to
the "B" terminal and the connect the (-) lead of the
voltmeter to the battery (+) cable].
6. Reconnect the negative battery cable.
7. Connect a tachometer or the M.U.T.-II/III (Refer to
GROUP 11A
− On-vehicle Service − Idle speed
check <4G1>
P.11A-11 or GROUP 11C −
On-vehicle Service − Idle speed check <4G6>
P.11C-11).
8. Leave the hood open.
9. Start the engine.
10.With the engine running at 2,500 r/min, turn the
headlamps and other lamps on and off to adjust
the alternator load so that the value displayed on
the ammeter is slightly above 30 A.
Adjust the engine speed by gradually decreasing
it until the value displayed on the ammeter is 30
A. Take a reading of the value displayed on the
voltmeter at this time.
Limit: maximum 0.3 V
NOTE: When the alternator output is high and the
value displayed on the ammeter does not
decrease until 30 A, set the value to 40 A. Read
the value displayed on the voltmeter at this time.
When the value range is 40 A, the limit is maxi
-
mum 0.4 V.
11.If the value displayed on the voltmeter is above
the limit value, there is probably a malfunction in
the alternator output wire, so check the wiring
between the alternator "B" terminal and the
battery (+) terminal (including fusible link).
If a terminal is not sufficiently tight or if the
harness has become discolored due to
overheating, repair and then test again.
12.After the test, run the engine at idle.
13.Turn off all lamps and the ignition switch.
14.Remove the tachometer or the M.U.T.-II/III.
15.Disconnect the negative battery cable.
16.Disconnect the ammeter and voltmeter.
17.Connect the negative battery cable.

CHARGING SYSTEM
ENGINE ELECTRICAL16-5
OUTPUT CURRENT TEST
M1161001000368
AK203362
Alternator
Ammeter
(clamp-type)
Voltmeter
Battery
Inition switch
Engine-ECU
or
Engine-A/T-ECU
Load
B FR
L
S
G
+
AH
–
Charging indicator
Brake warning light
This test determine s whethe r the a l terna t or outp u t
curren
t is normal.
1.Befo re the t e st, always be sure t o che c k the
fo llowi ng.
•Alternator inst allatio n
•Battery (Refer to GROUP 54 A − Battery − On-vehi-
cle Serv ice P.54A-5).
NOTE: The battery sh ould be sligh t ly discharg ed.
The
load neede d by a fully-charge d batte ry is
in
sufficient for an accurat e test.
•Drive belt tension
(Ref er to GROUP 1 1 A − On-vehicle Service <4G1>
P.11A-7 or GROUP 1 1 C − On-vehicle Se rvice
<4G6> P.11C-7.)
•Fusible link
• Abnormal noise from the altern ator while the
eng
ine is ru nning .
2.T u rn the ignition switch to the "LOCK" (OFF)
po sit i on.
3.Disco nnect the ne gative ba ttery cable.
CAUTION
Never use clips but tighten bolts and nuts to con-
nect the line. Otherwise loose connections (e.g.
using clips) will lead to a serious accident
because of high current.
4. Connect a clamp-type DC test ammeter with a
range of 0
− 120 A to the alternator "B" terminal
output wire.
NOTE: The way of disconnecting the alternator
output wire and of connecting the ammeter is pos
-
sibly not found the problem that the output current
is dropping due to the insufficient connection
between terminal "B" and the output wire.
5. Connect a voltmeter with a range of 0 − 20 V
between the alternator "B" terminal and the earth
[Connect the (+) lead of the voltmeter to the "B"
terminal, and then con nect the (-) lead of the
voltmeter to the earth].
6. Connect the negative battery cable.
7. Connect a tachometer or the M.U.T.-II/III (Refer to GROUP 11A
− On-vehicle Service − Idle speed
check <4G1>
P.11A-11 or GROUP 11C −
On-vehicle Service − Idle speed check <4G6>
P.11C-11).
8. Leave the hood open.

CHARGING SYSTEM
ENGINE ELECTRICAL16-6
9. 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 "B" terminal and the battery (+) ter
-
minal.
10.Turn the light switch on to turn on headlamps and
then start the engine.
11.Immediately after setting the headlamps to high
beam and turning the heater blower switch to the
high revolution position, increase the engine
speed to 2,500 r/min and read the maximum
current output value displayed on the ammeter.
Limit: 70 % of normal current output
NOTE: .
•For the nominal current output, refer to the
Alternator Specifications.
•Because the current from the battery will soon
drop after the engine is started, the above step
should be carried out as quickly as possible in
order to obtain the maximum current output
value.
•The current output value will depend on the
electrical load and the temperature of the
alternator body.
•If the electrical load is small while testing, the
specified level of current may not be output
even though the alternator is normal. In such
cases, increase the electrical load by leaving
the headlamps turned on for some time to dis
-
charge the battery or by using the lighting sys-
tem in another vehicle, and then test again.
•The specified level of current also may not be
output if the temperature of the alternator body
or the ambient temperature is too high. In such
cases, cool the alternator and then test again.
12.The reading on the ammeter should be above the
limit value. If the reading is below the limit value
and the alternator output wire is normal, remove
the alternator from the engine and check the
alternator.
13.Run the engine at idle after the test.
14.Turn the ignition switch to the "LOCK" (OFF)
position.
15.Remove the tachometer or the M.U.T.-II/III.
16.Disconnect the negative battery cable.
17.Disconnect the ammeter and voltmeter.
18.Connect the negative battery cable.

CHARGING SYSTEM
ENGINE ELECTRICAL16-7
REGULATED VOLTAGE TEST
M1161001100860
AK300727AC
BatteryIgnition switch
Engine-ECU
Engine-A/T-ECU Ammeter (clamp-type)
Load
Blue
MB991519
Voltmeter (digital-type)Red
Yellow BlackAlternator
B
FR
L
S
G
This test determine s whethe r the volt age regulator
correctly con
t rolling t he alternato r outpu t volt a ge.
1.Always b e su re to check the following b e fore th e
te st.
•Alternator inst allatio n
•Check that the b a ttery inst a lled in th e ve hicle is
fully charg
ed.
(Refer to GROUP 54A − Battery − On-vehicle Service −
Charging
P.54A - 4).
•Drive belt tension
(Ref er to GROUP 1 1 A − On-vehicle Service <4G1>
P.11A-7 or GROUP 1 1 C − On-vehicle Se rvice
<4G6> P.11C-7.)
•Fusible link
•Abnormal noise from the a l tern ator while the
eng
ine is ru nning
2.T u rn the ignition switch to the "LOCK" (OFF)
po sit i on.
3.Disco nnect the ne gative ba ttery cable.
4.Use the special tool Alternat or test harne ss
(MB99151 9) to connect a d i git a l voltmet e r
be tween the alte rnator "S" te rmin al an d earth
[Con nect the (+) lead o f the voltmeter t o the "S"
terminal, and then con nect the (-) lead of the
voltmeter to a secure earth or to the battery (-)
te rmin al].
5.Conn ect a clamp-t y pe DC test ammete r with a
ran ge of 0
− 120 A to the alte rnator "B" te rmin al
ou
tput wire
.
NOTE: The way of d i sconnectin g the a l terna t or
o
u
tput wire an d o f conn ecting the ammete r is pos
-
sibl y no t fo und th e p r oblem th at t he outp u t cur r ent
is dro
ppin g due t o the insu fficient conne ction
b
e tween te rmin al "B" an d the o u tput wire.
6.Reconne ct the negat ive battery ca ble.
7.Conn ect a t a chometer or th e M.U.T . -II/III (Refe r to
GROUP 1 1 A
− On-veh icle Service − Idle speed
check <4G1>
P.11A - 11 or GROUP 1 1 C −
On-vehicle Service − Idle speed check <4G6>
P.11C-11).
8. T u rn the ignition switch to the "ON" position an d
ch ec k t h at th e rea d i n g on t h e vo lt me te r i s eq u a l t o
th e batte ry volt age.
NOTE: If the volt a ge is 0 V , the cause is proba bly
a
n
open circuit in th e wire or fusible link betwee n
th
e alt
e
rnator "S" t e rminal a nd the battery (+) ter
-
minal.
9.T u rn all lamp s and accessorie s of f.
10.St a r t the en gine .
11 . I ncre ase t he eng ine speed to 2,5 00 r/min.
12.Read the va lue disp layed on the voltmeter when
th e alt e rnator output curren t alte rnator b e comes
1 0 A or le ss.
13.If the volt age re adin g conf orms t o the va lue in the
volt age regulation , then the volt age re gula t or is
o perating normally .

CHARGING SYSTEM
ENGINE ELECTRICAL16-8
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 tachometer or the M.U.T.-II/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 terminalVoltage regulator ambient
temperature
°C
Voltage V
Terminal "S"−2014.2 − 15.4
2013.9 − 14.9
6013.4 − 14.6
8013.1 − 14.5

CHARGING SYSTEM
ENGINE ELECTRICAL16-9
WAVEFORM CHECK USING AN OSCILLOSCOPE
M1161001200124
MEASUREMENT METHOD
AK100002
Alternator
"B" terminal CH1
AC
Co
nnect the oscillo scope specia l p a tt erns p i ck-up to
the alternato
r "B" terminal.
STANDARD W A VEFORM
Observ ation Conditi ons
FunctionSpecial pattern
Pattern heightVariable
Variable knobAdjust while viewing the waveform.
Pattern selectorRaster
Engine speedCurb idle speed
AKX00189
0.4 (V)
0.2
0
–0.2
–0.4
Voltage at
alternator
"B" terminal
Time
AG
NOTE:
AKX00190
The volt age waveform of th e alte rnator "B" t e rminal
can u
ndulate as sho w n in th e illustratio n . This wave
-
form is produce d when t he regu lator operate s
accordin
g to fluctu ation s in the alterna t or loa d (cu r
-
rent), and is normal fo r the alterna t or . In ad dition,
wh
en the volt ag e wavef o rm re ache s an excessively
high
value (app roximate ly 2 V or higher at idle ), it
of
ten indicates an o pen circuit du e to a brown fuse
be
twe e n a l te rn at or "B " t e r m in al an d ba tt er y , b u t n o t a
defective alte
rnator .

CHARGING SYSTEM
ENGINE ELECTRICAL16-10
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 th ere 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 illum inated). Also, check the charging
system totally.
Abnormal waveformProblem cause
Example 1
AKX00191
Open diod e
Exampl e 2
AKX00192
Shor t in diode