Mitsubishi Eclipse Workshop Manual page 130

13-66
FUEL
-
On-vehicle Inspection
of
MPI Components
TOP DEAD CENTRE SENSOR {/ehicles
built
up
to June 1992>
Output characteristic
One rotation of
crank angle sensor
Engine
control unit
connector
C
o
7FVO8Z3
C
OPERATION
o
The 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. wtrich then computes the
fuel injection
sequence.
etc. based on the input
signal.
i
o
Power to the top'dead centre sensor
is
supplied from the control relay and is grounded to the body.
The
r'r
top dead centre sensor
generates a
pulse signal as it
repeatedly connects and disconnects between 5V
voltage supplied from the engine control unit and earth.
TROUBI.ESHOOTING 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
sensor outputs
a pulse signal wtren the
ignition sryitch is turned ON (with the engine not
running), a faulty top
dead centre sensor
or
engine
control unit is
suspected.
Control
relay
ft
5V
il
5 V
nJH|rI
Hffi
@
Mat3ilirhi notofi
CorDorrtbn
Jrdy
1992
Pwt E9O|O.A