Mitsubishi Eclipse Workshop Manual page 133

FUEL -
On-vehicle Inspection
of
MPI Components
13-68-1
o
o
TOP DEAD CENTRE SENSOR <Vehicles built from Juty
1
992>
Control
relay
output characteristic
One
rotation of
crank angle sensor
otao5?a
Engine
control
unit connector
9FUO205
OPERATION
o
Th.e
top
dead centre sensor senses the
top
dead centre on compression stroke of the No. 1 and No. 4
cylinders. converts it into a pulse signal and inputs it to the engine
control
unit, which then
corputes
the
fuel injection
sequence. etc. based on the input
signal.
-
o
Power to the
top
dead centre sensor is supplied
froh
the control relay and
is
grounded to the body. The
top dead
centre.s-ensor generates
a
pulse signal as
it
repeatedly connects anä disconnects Uetweän Sli
voltage supplied from the engine controt unit and earth.
TROUBLESHOOTING HINTS
Hint
1:
lf
the
top
dead centre sensor does not
function correctly, correct
sequential injection is not made so
that the engine may stall. run irregularly at idle or fail
to
accelerate normally.
Hint
2:
lf the
sensot
o.utputs
a pulse signal when
the ignition switch is turned
Otrt
(witn the engine not
running). a faulty
top
dead centre sensor or
engine control unit
is suspected.
Waveform inspection
with
analyzer
Refer
to
P.1
3-67.
HARNESS INSPECTION
Refer
to
P.13-68.
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Morors
Corpontion
July
1992
PWUE9010-A