1990 MITSUBISHI ECLIPSE ECO mode

FUEL SYSTEM -Auto-cruise Control System14-65OVERDRIVE-CANCEL FUNCTION

%/hen, during fixed-speed driving, the actual vehicle
speed decreases to (or below) a speed which is a
certain fixed value below the memorized vehicle
speed, the overdrive is canceled temporarily for a
specified period of time and then the memorized
vehicle speed is restored within a short period of
time.
Overdrive is canceled under any of the following
conditions:
8 When the RESUME switch is being operated.
l When, during fixed-speed driving, the actual
vehicle speed decreases from the preset speed
by 1.25 km/h (0.8 mph) or more.
The arrow in the circuit diagram indicates the flow of
current with the OD switch in the ON position
(overdrive).In the Overdrive Mode
The control unit microcomputer Outputs an OD-ON
signal (HIGH) constantly, keeping transistor
Tr,turned ON. At this time, transistor
Tr, is also ON,
causing ON signal
IA to be output to the transaxle
control unit and maintaining the overdrive mode.
The Overdrive is Canceled
When the actual vehicle speed becomes less than
the set speed, the OD-ON signal (HIGH) is no longeroutput from the microcomputer and transistor
Tr, is
turned OFF. This causes transistor
Tr, to be turned
OFF and current
II: flowing by way of the OD switch
of the selector lever is cut off at transistor
Trl. As a
result, at that point the vehicle speed is controlled
by the
3-speed automatic transaxle.
Auto-cruise control unit

14-74
_ ,.-..FUEL SYSTEM
- Auto-cruise Control System
When Canceled by the Stop Light Switch (broad
solid-line arrows)
The stop light switch is a four-pole type that
integrates the switch for the stop light (NO) with
that for the auto-cruise control (NC).
When the brake pedal is depressed, the contacts forthe auto-cruise control (NC) open, cutting off the
circuit to energize the electromagnetic clutch coil.
At the same time, the contacts for the stop light
(NO) close to allow a cancel signal to be input from
the
12-V power supply of the control unit to the
cancel circuit and to the microcomputer. As a result,the transistor which energizes the actuator electro-
magnetic clutch coil turns OFF and the electro-
magnetic clutch coil grounding circuit is cut off, thus
canceling the auto-cruise control mode.
When Canceled by the Clutch Switch (thin
solid-line arrows)
When the clutch pedal is depressed, the clutch
switch is turned ON and the battery voltage is
applied to the cancel circuit of the control unit. then,a cancel signal is input to the microcomputer.
causing the transistor that energizes the actuator
electromagnetic clutch coil to turn OFF. This results
in the electromagnetic clutch coil grounding circuit
bma$ndge cut off, which cancels the auto-cruise control
When Canceled by the Selector Lever (position“N”) (dotted-line arrows)
When the transaxle control selector lever is placed
in the “N” (neutral) position, the inhibitor switch is
turned ON and, as a result, current flows from the
control unit to the inhibitor switch, starter, and
ground. Then, a cancel signal is input from the
cancel circuit to the control unit, causing the
transistor which energizes the actuator electro-
magnetic clutch coil to be turned OFF. As a result,
the electromagnetic clutch coil grounding circuit is
cut off and the auto-cruise control mode is canceled.Although a small current (voltage 5 V) flows through
the starter, it is not activated.
MAIN switchLIMIT SWITCH
The function of the limit switch is to shut off the flow of current
to the motor and apply an electric brake to quickly stop the
motor if the throttle valve becomes either fully open or fully
closed, thus preventing problems which might be caused by an
overload of the motor.
The illustration at left shows the condition of the limit switch
when the throttle valve is fully closed, indicating that
.limitswitch
(1) is in the OFF and the RELEASE circuit is being
deenergized.
IAutocruisecontrol unit
07Aool'
.-

i t-7POWER STEERING
- Oil Pump19-13WHEN OIL PUMP OPERATES AT HIGH SPEED
(? -70 RPM OR MORE)
VII, ,dn the pump operation becomes high speed. thethe gear box then is supplied only from the fixed
plunger is pushed further toward the
right than fororifice, with the result that the amount of discharge
medium speed, and both variable orifices close.flow
is reduced to minimum, and, as a result, theFurthermore. the flow-control valve also moves, and
steering effort becomes moderately “heavy”, thus
the bypass port opens wider. The fluid flowing to
providing excellent handling stability at high speed.
Fixed orifice13POO40
OPERATION OF THE RELIEF VALVE
When the A chamber pressure increases when theAs a result of this action, the pressure of the
Bsteering wheel is turned while the vehicle ischamber decreases, and the relief valve closes once
stopped, the
B chamber pressure also increases.again. This action takes place in a moment, and in
and, when the pressure exceeds the relief springthis way, by maintaining the correct balance, the
set load of 8,000 kPa (1,138 psi), the relief valve panmaximum pressure is controlled.
which is closed by a steel ball opens and the fluid
passes through the bypass port and is returned to
the pump’s intake port.
Steel ballRelief sprtngTo steering gear box
/Bypass pan
WPOO41

BODY - Instrument Panel / Floor Console23-29
“WTRUMENT PANELR23PAA9I ne instrument panel is of the round trim type like a
cockpit, with shelf styling to give a wide view inIt has the following features.
front without the sense of being boxed in.l The surface is covered with soft padding for
The panel itself is an integral unit made of asafety in the event of a collision.
plastics-based material; the surface is covered withl The large-capacity glove box also functions as
soft padding.the knee protector.
Cluster
Dane1Knee protector
IlQAQ217
FLOOR CONSOLE
rhe floor console has its front console and rear
nsole molded integrally.
The rear console on the higher grade model is
provided with a large-size lid for the greater ease of
use.The floor console has the following features.
lThe parking brake lever is offset from the vehiclecenterline to increase the capacity of the rear
R23clAABl The coin box is installed on all models.
l On vehicles with manual transmission, a coin
holder is provided in the space otherwise taken
up by the power/economy changeover switch.
lOn higher grade model, a cup holder is available
as an option. The two cup holders are linked
with a slit, making it possible to store
sun-
glasses.
console.
Side coverCoin box/
/\ lQAO27l

L.
24-4HEATERS AND AIR CONDITIONING - General Information
’ /To side (door) window
(side defroster)
t4L\ m\vTofacearea
/(side ventilator)To windshiel
(defroster)
To side (door) window
(side defroster)
Blower switch
Toface area(side ventilator)
u rorootanTemperature control knob
, , , ,Air-selection lever
Air conditioner switch
OPERATION DIAGRAM OF COMPRESSOR MAGNET
CLUTCHNOTETemperature values shown are for information only.
Air conditioning and
ECONO mode OFFAir conditioning and
ECONO mode ON
II
32 (89.6)
Evaporatorinlet temperature “WF)

EMISSION CONTROL SYSTEMS - Exhaust Car Recirculation (EGR) System25-7Duty ratio
I .,
ON e-_-m-L--l
T2L1.TlOFF---
m
1c1-i1e2100260 msec. 60 msec.
EGR CONTROL VALVE
Spring
NOTEThe duty ratio is the ON duration ratio of 16.7 Hz pulse or
T2/T1.The higher the duty ratio, the more mean current flows to the
boost meter. and as a result, the boost meter reads the higher
value.The smaller is the duty ratio, the boost meter reads the smaller
value.
Diapl
.Valveiragm
To Intakemanifold
Exhaust gasApply vacuum
7EM0012
NOTEThis illustration indicates Non-Turbo models.7EMOO15The EGR control valve is a diaphragm that functions
to control the flow of
EGR gases by opening and
closing the valve according to the negative pressure
(vacuum) acting upon the partitioned chamber.When the negative pressure becomes stronger than
the spring force, the valve opens, as shown in the
illustration, and the exhaust gases can flow.
Valve
BlmetzII
17EMOO16
THERM0 VALVE
The therm0 valve functions in response to the temperature of
the engine coolant. thus controlling the negative pressure
acting upon the
EGR control valve.
The valve opens at a temperature of
65°C (149°F) or lower, and
closes at
65°C (149°F) or higher.