2005 MITSUBISHI LANCER Workshop Manual

CHARGING SYSTEM
ENGINE ELECTRICAL16-9
WAVEFORM CHECK USING AN OSCILLOSCOPEM1161001200124
MEASUREMENT METHODConnect the oscilloscope special patterns pick-up to
the alternator "B" terminal.
STANDARD WAVEFORM
Observation Conditions
NOTE:
The voltage waveform of the alternator "B" terminal
can undulate as shown in the illustration. 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.
AK100002
Alternator
"B" terminalCH1
AC
Function Special pattern
Pattern height Variable
Variable knob Adjust while viewing the waveform.
Pattern selector Raster
Engine speed Curb idle speed
AKX00189
0.4 (V)
0.2
0
–0.2
–0.4 Voltage at
alternator
"B" terminal
Time
AG
AKX00190

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 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 waveform Problem cause
Example 1 Open diode
Example 2 Short in diode
AKX00191
AKX00192

CHARGING SYSTEM
ENGINE ELECTRICAL16-11
Example 3 Broken wire in
stator coil
Example 4 Short in stator
coil
Example 5
At this time, the charging warning lamp is illuminated.Open
supplementary
diode Abnormal waveform Problem cause
AKX00193
AKX00194
AKX00195

CHARGING SYSTEM
ENGINE ELECTRICAL16-12
ALTERNATOR ASSEMBLY
REMOVAL AND INSTALLATION <4G1>M1161001400548
REMOVAL SERVICE POINT
<> ALTERNATOR ASSEMBLY
REMOVAL
Remove the alternator assembly from above the
vehicle.
Pre-removal Operation
•Under Cover Removal
•Drive Belt Removal (Refer to GROUP 11A - Crankshaft
Pulley P.11A-16).Post-installation Operation
•Drive Belt Installation (Refer to GROUP 11A - Crankshaft
Pulley P.11A-16).
•Drive Belt Tension Adjustment (Refer to GROUP 11A -
On-vehicle Service P.11A-7).
•Under Cover Installation
AC303729
1
2
4
3
44 ± 10 N·m
23 ± 2 N·m
24 ± 3 N·m12 ± 2 N·m
AB
Removal steps
1. Power steering pressure hose
clamp
2. Alternator connector and terminal3. Alternator adjusting brace
<>4. Alternator assemblyRemoval steps (Continued)

CHARGING SYSTEM
ENGINE ELECTRICAL16-13
REMOVAL AND INSTALLATION <4G6>M1161001400559
Pre-removal Operation
•Under Cover Removal
•Strut Tower Bar Removal (Refer to GROUP 42 P.42-9).
•Drive Belt Removal (Refer to GROUP 11C - Crankshaft
Pulley P.11C-16).
•Air Cleaner Assembly Removal (Refer to GROUP 15
P.15-3).Post-installation Operation
•Air Cleaner Assembly Installation (Refer to GROUP 15
P.15-3).
•Drive Belt Installation (Refer to GROUP 11C - Crankshaft
Pulley P.11C-16).
•Strut Tower Bar Installation (Refer to GROUP 42 P.42-9).
•Drive Belt Tension Adjustment (Refer to GROUP 11C -
On-vehicle Service P.11C-7).
•Under Cover Installation
AC303826
1
2
318 ± 3 N·m
AB
Removal steps
1. Shift cable connection<>2. shift cable and shift cable bracket
assembly
3. Vehicle speed sensor connectorRemoval steps (Continued)

CHARGING SYSTEM
ENGINE ELECTRICAL16-14
REMOVAL SERVICE POINT
<> SHIFT CABLE AND SHIFT CABLE
BRACKET ASSEMBLY REMOVAL
Remove the shift cable bracket installation bolt with
the shift cable installed on the shift cable bracket,
and remove the shift cable and shift cable bracket
assembly from the transmission.
<> ALTERNATOR ASSEMBLY
REMOVAL
After removing the alternator assembly installation
bolts and nut, move the alternator assembly to the
transmission side and remove the alternator
assembly upward the engine room through the
clearance between the transmission and the inlet
manifold.
AC303827
65
84
9 7
22 ± 4 N·m
23 ± 3 N·m
8.8 ± 1.0 N·m44 ± 10 N·m
AB
Removal steps
4. Battery wiring harness clamp
5. Engine oil pressure switch
connection
6. Alternator connector<>7. Alternator assembly
8. Water pump pulley
9. Alternator braceRemoval steps (Continued)
AC302930AB
Alternator
assemnly