Alternator - Mitsubishi Electric Lancer Evolution-VII Workshop Manual

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
Example 1
Example 2
Example 3

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
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.)
D
ENGINE ELECTRICAL -
Problem
cause
Open diode
Short in diode
Broken wire
in stator coil
Charging System
Abnormal waveforms
Example 4
Example 5
At this time, the charging warning lamp
is illuminated.
Problem
cause
Short in
stator coil
Open
supplementa-
ry diode