Mitsubishi Eclipse Workshop Manual page 164

13-96
FUEL
-
On-vehicle Inspection
of Mpl
Components
Waveform
@D,
observation point
Condition of waveform peak
and maximum voltage (Refer
to
abnormal waveform examples
1
and
2.1
Condition of waveform peak and maximum voltage
Possible cause
Rises
from close to approximately 2V to approximately 4.5V to the
right.
Normal
Becomes a square wave
of
approximately 2V.
Broken wire in primary ignition circuit
Becomes
a
square
warre
of
pol€r
supply
roltage.
Povrrer
transistor defect
Normal
wacform
Normal
waeform
vB-
t
Abnormd
Yvawform example
o
Example
1
Waveform when engine is cranking
Cause
of
malfunction
Waveform characteristics
The rise on the right of the
peak does
voltage is low (approximately
2V).
Example 2
Waveform when engine is cranking
Cause
of
malfunction
Porer transistor
malfunction
Waveform characteristics
Porruer
supply voltage is supplied when the ponrer transistor
is
ON.
not
appear
and
C
o
HARNESS INSPECNON
Check
for continuity
b€t\ reen the
ignition coil and ignition wvitch
(lG).
.
lgnition sryitch connector:
Disc.onnected
.
lgnition coil connectol:
Disconnected
NOTE
Insert
the probes of the circuit
tester
into both ends of the
hamess.
Repair
the
harness.
(@tr-
@El)