Mitsubishi Eclipse Workshop Manual page 159

FUEL
-
On-vehicle lnspection
of
MPI Components
13-91
I
o
Waveform observation point
Verify
that the
standard waveform appears when the
operational conditions
of
the stepper motor
are
established.
@:Checkwhetherornottheinducede|ectromotiveforceisgeneratedduetotherotationofthe
motor.
Difference
from the
standard waveform Estimated cause
lnduced electromotive force does not appear or
is entremely
small.
lmproper operation of the motor
@
:
Height
of coil
reverse electromotive force
Difference
from the
standard waveform
Estimated cause
Reverse
electromotive
force of coil does not appear or is
extremely small.
Short-circuited coil
,
o
01PO209
Abnormal vtraneform example
Trouble cause
lmproper operation
of
motor (Motor does not
rotate.)
Waveform feature
Induced electromotive force due
to
motor rotation does not
appear.
t
e
HARNESS INSPECTION
Check
for continuity
between
the
idle
speed
control servo and the control
relay.
.
ldle speed control servo connector:
Disconnected
.
Control relay connector:
Disconnected
NOTE
Insert
the probes of the circuit
tester
into both
ends
of the
harness.
Repair the
harness.
(@tr]-
@81)
Check
for an open-circuit or a
short-
circuit
to
earth
bertrryeen
the
engine
control unit and the idle speed
control
servo.
.
Engine
control unit connector:
Disconnected
.
ldle speed control sen/o connector:
Disconnected
A
Repair
the
harness.
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