Mitsubishi Eclipse Workshop Manual page 152

13-84
FUEL -
On-vehicle Inspection
of
MPI Components
INJECTORS
C
Equipment side
connoctor
Connector
Solenoid coil
Plunger
Needle
valve
Injection
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OPERATION
o
The injector
is an injection
nozzle
with a solenoid
valve
which
injects
fuel
according
to the
injection
signal coming from the engine control unit.
The injector has a
fixed. nozzle
opening area and the fuel pressure against manifold inside
pressure
is
regulated to
a
fixed
level. Therefore, the volume of fuel injected
by
the injector
is determined
by the
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during which the needle v4vg is open, namely, by the time during which the solenoid
coil
is energized.
The battery voltage is applied through the
control
relay
to this
injector. When the engine controJ unit
turns on the power transistor in the unit, the solenoid
coil
is energized
to
open the inieötor
valve,
which
then injects
fuel.
TROUBLESHOONNG HINTS
1:
lf the engine is hard to start when hot
check
fuel
pressure and check
the
injector
for
leaks.
2:
lf
the injector
does not when the engine
that is hard to start
is cranked. the foilowing
as
well
as
the
injector itself may be
responsible.
(11
Faulty power supply
circuit to the engine control
unit
faulty earth circuit
(21
Faulty
control
relay
(3)
Faulty crank angle sensor, top
dead centre sensor
Hint
3:
lf there is any cylinder whose idle state remains unchanged when the
fuel
injection of
injectors
is
cut one after another during idling,
make
following checks about such
cylinder.
(1)
Injector and harness check
l2l
lgnition plug and high tension cable check
(3)
Compression pressure check
l
Hint
Hint
c
o
Control
relay
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-
Apr.199l
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