fuel pressure MITSUBISHI ECLIPSE 1990 Owner's Guide

14-56FUEL SYSTEM -Supercharge Pressure Control
SUPERCHARGEPRESSURE CONTROL RlWDetonation
sensor
lEngine control
unit
Knockcontrol
ControlrelayIntercooler
h&l --/I- h
.. .Waste gate
P solenoid valve
Air cleaner,
Power
transistorWaste gate
unit
actuatorOf
CT1 +p$?V~~~t
6FUO665
II\Spring set pressure
Turbo pressure acting5Fuo570
on waste gate actuatorWhen using premium-grade gasoline, the engine control unit
functions to switch ON the power transistor, then waste gate
solenoid valve is turned “ON”.
Because there is then a partial leak of the turbo pressure acting
upon the waste gate actuator as a result, the waste gate valve
will then not open unless there is an increase of the turbo
pressure to a level that equals or exceeds the set pressure of
the waste gate actuator spring.
As a consequence, there is sufficient supercharging when
premium-grade gasoline is used, and a high level of output can
be obtained.
If regular-grade gasoline is used, the power transistor is
switched OFF by the engine control unit, thus interrupting the
circuit of the waste gate solenoid valve and stopping the
leakage of turbo pressure.
When the turbo pressure then increases, as a result, to reach
the waste gate actuator spring set pressure, the waste
gate----valve opens.
When regular-grade gasoline is used, therefore, the turbo
pressure becomes smaller, and, coupled with knock control,
the engine is thus protected from the effects of knocking.

AUTOMATIC TRANSAXLE - Torque Converter
TORQUE CONVERTER
Lock
ring
I
Damper
F
clutch-
B-.Turbine
.AA
/:ront cover
h,Impeller
AStartorWhen damper clutch is
I\When damper
aInput shaftactivated
clutch isactivated
175202The torque-converter is composed of the impeller
(rear cover), turbine,
stator, damper clutch, one-way
clutch, front cover, etc.Furthermore. the torque-converter cannot be dis-
assembled because the outer circumference of the
shell
(front cover and rear cover) is sealed by
welding.
Because the torque-converter is coupled to the
engine’s crankshaft (via the drive plate). the shell
(front cover and impeller) always turns in the same
way when the engine is running.
As a result, the oil pump is also caused to rotate (by
the hub welded to the center part of the rear of the
shell) at the same speed as the engine.
The boss at the front part of the shell is inserted in
the hole at the rear part of the crankshaft. thus
providing support of the torque-converter.
A facing like that attached to the transaxle’s clutch
disc is attached to the damper clutch, and the
damper clutch and the turbine are connected by the
tabs (of the lock ring on the outer circumference of
the turbine shell) that fit into the groove on the outer
circumference of the damper clutch.
The torque-converter actuation hydraulic pressure,at the damper clutch activation area, passes be-
tween the torque-converter’s hub and the reaction
shaft, and enters the torque-converter.
When this happens, the hydraulic pressure acts
upon the A part (between the damper clutch and the
turbine), with the result that the damper clutch is
pressed against the front cover, and the damper
clutch, with a slight slip (as described later) becom-
es connected.
In this manner, the amount of slippage of the
torque-convener is reduced, without a damper
spring, to far below at even the low-speed level,
thus making a practical improvement of fuel con-
sumption.
At the damper clutch non-activation area, because
the torque-converter actuation hydraulic pressure
passes through the input shaft oil passage
-1enters the torque-converter from the
B part &-tween the damper clutch and the front cover). the
damper clutch moves away from the front
cover,thus releasing the damper clutch.
In this condition, operation is as an ordinary torque-
converter.

__..--. -._ _^__. __--- -._ _..EMISSION CONTROL SYSTEMS
- Evaporative Emission Control Svsvem25-l 1
,VAPORATlVE EMISSION CON-
TROL SYSTEMIn order to prevent the escape of fuel vapor from the
fuel system into the atmosphere. the evaporative
emission control system consists of a charcoal
canister, a purge control solenoid valve, etc.
When the fuel vapors generated inside the fuel tank
fill the tank, they press and open the overfill limiter’s
valve and pass to the canister, where they are
absorbed into and accumulated by the charcoal.
Because the purge control solenoid valve is ON
(open) when the engine is running, as a
conse-
Non-TurboAir cleaner
Fuel injector
Canister
Charcoal
/Purge control tsolenoid valve r
RZSGAAB
quence of the purge air being taken in from the
canister in accordance with the intake negative
pressure (vacuum), the fuel vapors accumulated in
the canister are taken from the charcoal and are alsotaken into the intake manifold.
Note that the purge control solenoid valve is OFF
(closed) when the engine is cold and during idling,
and so fuel vapors are not taken into the intake
manifold at that time.
Overfill
limiter(Two-way valve)
Fuel check valveFilter
- Fuel vapor
*---- Purge air

--.25-14EMISSION CONTROL SYSTEMS
- Evaporative Emisson Control System
Pressure valveTo overfill
’ limiter
40
” Ball
Bail
\From fuel tank03E51fOVERFILL LIMITER (TWO-WAY VALVE)
The overfill limiter consists of a pressure valve and a vacuum
valve. The pressure valve is designed to open when the fuel
tank internal pressure has increased over the normal pressure
and the vacuum valve opens when a vacuum has been
producted in the tank.
FUEL CHECK VALVE
The fuel check valve is used to prevent fuel leaks if the vehicle
rolls over. This valve is connected in the fuel vapor line
(between canister and overfill limiter) and is installed on thefirewall.
The fuel check valve contains two balls, as shown in the
illustration. Under normal conditions, the fuel vapor passage in
the valve is opened, but if roll-over occurs one of the balls
closes the fuel passage, thus preventing fuel leaks.
FUEL FILLER CAPThe fuel filler cap is equipped with a relief valve to prevent the
escape of fuel vapor into the atmosphere.
.
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