1990 MITSUBISHI ECLIPSE light

_ -. _ -.__-ELECTRICAL
- Lighting
HEADLIGHT LOWERING OPERATION
1. Pop-up switch from ON to OFF, lighting switch OFF
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Ar
Fusablehnk .
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When the pop-up switch is turned OFF (from the
ON position) with the headlights in the raised
position, current from fusible link @ flows through
the down timer circuit of the passing control relay,
turning ON transistor
Tr2. The current from transis-
tor
Tr2 passes through the D contact of the U/D
switch of the pop-up motor to the pop-up motor,
energizing the pop-up motor relay. When the pop-up
motor relay is energized, the current from fusible
link @ flows through the pop-up motor, which in
turn results in the motor starting rotating. As a
.-.-result, the headlights start lowering. When the
crank arm of the
popup motor rotates about 180” to
the DOWN stop position, the contact of the inter-
locking U/D switch changes from
D to U, thus
cutting off circuit to the pop-up relay. The
deenergized pop-up motor relay means the current
from fusible link @ being cut off. Then, the
popUPmotor stops and the headlights remain in the
fully-lowered position.

37..-. _.-.a*/ _ --‘-:.iA -i .- -..., mpv,,ELECTRICAL
- Lighting8-212. Lighting switch from ON to OFF, pop-up switch OFF
-
16AO607
--.---- ._ - _-.._ ..-_ -_- -- _. --- --

8-22ELECTRICAL - Lighting--Ignition ON
switch OFF
prDoor ON
switch OFF
IDELAYED SWITCH-OFF DOME LIGHT
When the door is closed with the dome light switch in
thtDOOR position and ignition switch in the OFF position, the
dome light stays lit for a given period of time and then dims
before going out.
If the ignition switch’ is in the ON position, the dome light does
not dim but goes out as soon as the door is closed.
The foot light and ignition key illumination light operate in
exactly the same way.
16UOO94OPERATIONIgnition switch
(G)Fusible link a
Domelight
relay
9 Mutti-purpose
fuse
%69Ignition
key illu-
minatio
light
Domelight
Domelight
switch
Tr
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1.When a door is opened (the door switch placed
in the ON state) with the dome light switch in
the DOOR position, current flows from the
battery to the dome light to the dome light
switch (and the ‘foot light and ignition key
illumination light) to diode
DI to the door switch
to the ground, and the dome light lights.
2.When the ignition switch is in the OFF position,
L signal is input to the NOT circuit and inverted Hsignal input to the AND circuit. When the door is
-closed at this time (door switch OFF), the circuit
. .----es :- _.a -&Aso the AND circuit outputs
H signal to operate
the timer circuit.
The timer circuit outputs to the base of
Tr the
signal which gradually varies in about six
seconds. So the voltage applied to the light
-gradually reduced to cause the light to dim.
3.When the ignition switch is in the ON position,His input to the NOT circuit
ahd inverted L signal
input to the AND circuit. So when the door is
closed, the timer circuit does not operate, and
the light does not dim but goes out immediately.
_- .-._. ._-__._

8-32ELECTRICAL - Theft-alarm System
THEFT-ALARM SYSTEM
NOOIAAAWhen the theft-alarm system has been armed by a
fixed sequence for locking the doors with the key or
without the key, if thereafter a door, the rear hatch
or the hood is opened in an unauthorized way. the
horn will sound intermittently for period of approx-
imately three minutes, and. at the same time, the
headlights will flash on and off, thus providing
audible and visual warning. signals.Furthermore, the starter circuit is interrupted in SIa way that the engine cannot be started, if
‘Lignition key is not used. Note that this system is
controlled by the electronic control unit (ECU).
This ECU includes an independent microcomputer
for the exclusive use of the theft-alarm system. This
microcomputer arms, disarms, activates and deacti-
vate the alarm system.
The system is composed of the components de-
scribed below.
Key-reminder
switchLiftgate unlock switch
!/Starter
Door key cylinder
”daytime running light relay Security
lig
ECU
I
HornOPERATION
iAbout
20 seconds after all doors are closed
and locked. the rear hatch is closed. and the
hood is closed + SYSTEM ARMED
. .‘11A door rear hatch or hood is brokenALARM ACT,“ATED
* n Engine is disabled to start.
Headlights
Iflicker
*.
.u Driver opens door with the key
I.l .
SYSTEM DISARMEDI J-0
-IDriver unlocks a door
0 Normal starting -1or rear hatch with the*D key.
- ALARM DEACTIVATED(SYSTEM DISARMED)

ELECTRICAL - Theft-alarm System8-33ARMING THE SYSTEM
After the following procedures have been completed, the SECURITY light illuminates for about 20 seconds,
and when illumination stops, the system is armed.
(1) Pull out the ignition key from the key cylinder.
(2) Open a door. (The other door is closed.)
(3) Lock the door with the key or the
keyless-locking method.
(The central door locking system will then function to lock all doors.)
NOTE(1) The system is set regardless of whether the hood and liftgate are open or
closed, and is armed as
soon as the light goes out.
(2) Even after the system has been armed, if the key is used to open the liftgate, the system will not be
activated; when the liftgate is then
closed, moreover, the system will be armed.
DISARMING THE SYSTEM
(1) The system will be disarmed if the key is used to unlock a door.
(2) If the system is armed while the driver is still in the vehicle, the system can be disarmed by inserting the
ignition key and turning it to the ACC or ON position.
(3) If the door lock is unlocked while closing the door or the door is ajar.
(4) If the door is unfastened while the SECURITY light illuminates.
ACTIVATING THE ALARM
(1) if an attempt is made to open a door, the liftgate or the hood, without using the key, while the system is
armed, the horn will sound intermittently and the headlights will flash on and off for approximately
three,
minutes.Furthermore, the starter circuit is interrupted at this time also, making starting of the engine impossible.
(2) if a further attempt at *forcible entry is made after the first three-minute alarm has finished, the
three-minute alarm will be activated again.
DEACTIVATING THE ALARM
(1) To deactivate the alarm, insert the key into the door’s key cylinder and turn the key.
(2) The alarm is deactivated and the system is disarmed when the iiftgate is unlocked with the key.
CHECKING THE SYSTEM OPERATION
The activation/operation of the system can be checked by following the steps below.
(1) Turn the ignition key to the ON position and then use the power-window switch to fully open the window
at the driver’s seat side.
(2) Turn the ignition key to the LOCK position and then remove the key from the ignition.
(3) Open only the driver’s door, and close all the other doors, as well as the hood and the rear hatch.
(4) Lock the driver’s door by the key or the
keyless-locking method.
(5) All doors will then be
locked, and the SECURITY light (within the combination meter) will illuminate; check
to be sure that illumination stops in about 20 seconds.
(6) After about two seconds have passed after the SECURITY light illumination stopped, reach through the
window of the driver’s door, pull up the lock lever to unlock the door, and then open the door.
(7) Check to be sure that, when the door is opened, the horn starts sounding and the headlights flash on and
Off.
(8) To stop the alarm, insert the key into the door’s key cylinder and turn the key.
!?iEeck the alarm for the opening of the liftgate or hood open the liftgate (or the hood) by using the
remote liftgate release lever (or the hood release lever),
located at the driver’s seat side either before the
alarm is activated by the opening of a door, or after the finish of the first three-minute alarm.

FUEL SYSTEM -Fuel Supply and Fuel Pressure Control14-7FUEL TANK
m/ithin the fuel tank are the electric fuel pump, the
.ank filter, and the fuel gauge unit.
-I he fuel tank has the following features:
lThe fuel tank is located below the rear seat floor,thus giving it protection in the event of a
rear-end collision.
<2WD>l The fuel tank is located under the engine
compartment floor instead of installing it under
the rear seat floor where the rear axle is located.
<4WD>lA reserve cup is provided within the fuel tank so
!Detailed view of reserve cup
t2WD>Detaiied view of reserve cup
t4WD>
Fuel03AO267
Fuelthat fuel supply is smooth even when there is
only a small amount of fuel remaining.
lA baffle plate arrangement is used at the proper
place within the fuel tank in order to prevent the
generation of abnormal noise caused by the
undulation movement of the fuel.
l A chipping-protection coating has been applied
at the lower part of the fuel tank in order to
protect the tank from damage by pebbles, etc.
thrown up from the road surface, and from
subsequent corrosion.
lA fuel pump and fuel gauge unit assembly has
been adopted which incorporates the fuel pump
and the fuel gauge unit in one.
<4WD>l A drain plug has been provided in order to
improve serviceability.
Thermistor (for low
fuel warning light)In-tank filter
Fuel tankI
e
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Drain plug
assembly

FUEL SYSTEM - Sensors
CRANK ANGLE SENSOR
II
DiscSensor
The crank angle sensor is mounted on the cylinder
head and is directly coupled to the intake camshaft.The crank angle sensor consists of a disc -and a
sensor unit.
Mu0499Slit for
crank anglesensor
Photo diode
LED
The disc, made of metal, has four slits located 90 degrees aparton its periphery and two slits located 180 degrees apart inward
of the four slits.
-The inner slits are used by the top dead center sensor
th,detects the top dead center of the No.
1 and No. 4 cylinders,
and the outer four slits are used by the crank angle sensor that
detects the crank angle. The disc is positioned on the sensor
shaft and rotates as a unit with it, being turned by the intake
camshaft.The sensor unit has two
LEDs and two photo diodes, used’to
detect the crank angle sensor slits and the top dead center
sensor slits.
The disc rotates between the
LEDs and the photo diodes. Each
time a slit comes between a LED and photo diode pair, the light
emitted by the LED reaches the photo diode by passing
through the slit.
Sensor unit
I I1
Power supply
I
Engine control untt
r
Crank angleslgnal

FUEL SYSTEM - Sensors14-21When exposed to light, the photo diode conducts
urrent in a direction opposite to an ordinary diode.
.s a result, current flows in the direction indicated
by the arrow and dotted line and a voltage (5 volts) isapplied to the comparator of the sensor unit so that
the terminal voltage of the engine control unit
becomes 5 volts. When the disc rotates further andthe slit moves beyond the space between the
LED/photo diode pair, the light can no longer reach
the photo diode, thus the current indicated by the
dotted line ceases to flow and the terminal voltage
of the engine control unit becomes 0 volt.
tn this
way, pulse signals are sent to the engine control
unit from the sensor unit.
OXYGEN SENSOR
k
1 ~~~~t13ate~ousingCoverLead wiresConnectorHeater
Enginecontrol unit6FUlOO5
- Oxygen‘-serisor
The oxygen sensor is mounted at the outlet of the exhaust
manifold or the turbocharger. The sensor, which uses an
oxygen concentration cell having a, solid electrolyte, has such
characteristics that its output voltage changes sharply in the
vicinity of the stoichiometric air/fuel ratio.
The sensor makes use of this characteristic to detect oxygen
concentration in the exhaust gas and feeds back the signal to
the engine control unit, which then decides if the air/fuel ratio is
rich or iean relative to the stoichiometric ratio.
Based on this decision, the air/fuel ratio is feedback-controlled
to achieve the stoichiometric ratio at which the catalytic
converter operates most effectively.
In addition, because this oxygen sensor incorporates a heater,
the response of the sensor is good even if the temperature of
the exhaust gas is low, and, as a result, feedback control of the
air/fuel ratio is possible for a short time after the engine is
started.
Stoichiometric air/fuel ratlo
r3
Lean
Air/fuel ratioEC1007