Mitsubishi Eclipse Workshop Manual page 147

FUEL
-
On-vehicle Inspection
of
MPI Components
13-79
DETONATION SENSOR
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sensor
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7FV1279
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Equipment side
connector
Detonation
sensor
I
otaortt
Measuring method
Disconnect
the
connector
of
the
detonation sensor.
and
connect
the
special pafierns pick-up of the
analrTzer
to
the
terminal on the sensor
side.
I
I
I
o
o
Engine control unit connector
l-ljHrfl l--L_iHLl
F_JHIJ
Hffiffiffi
OPERATION
o
The detonation sensor converts cylinder block vibration caused
by detonation into a voltage
that
is
proportional to
intensity of vibration and inputs it to the engine control unit, which then provides delay
control of the ignition timing
based
on this signal.
TROUBLESHOOTING HINTS
lf detonation is caused while driving
with high
load,
following as well as the
detonation sensor may
be
responsible.
(1) Incorrect heating value of the ignition
plug
(2)
Use
of
inadequate fuel
(3)
Poorly adjusted reference
ignition timing
Waveform inspection
with
anatyzer
o
o
o
o
Engine
control
unit
t
@
ilitlublrhl
ßlorort
brpor.tlon
Apr.
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