1990 MITSUBISHI ECLIPSE power steering

14-50FUEL SYSTEM- Idle Speed Control
SDeed adiustina screwI -Throttle valve
Lw-3O(-22) 0132) 30(86! 601140) 9ofl94)Coolant temperature
“C (OF)6FUO641
E94
72--2--I
Q--.-.-z
3201.000 --4-\-\
5P9.o%IIIaI L-2O(-41 Of3214Of104)801176)Coolant temperature
“C VF)6FU028E
-201-4) Of3214OI104180(176(2) When the engine coolant temperature is low, the fast idle
air valve together with the idle speed control
servoperated to supply an adequate volume of bypass
,.raccording to the engine coolant temperature.
Feedback Control at
Idle(1) Basic target idle speed
The basic target idle’ speed is preset as a map value
optimized according to the engine coolant temperature.
This speed is maintained to ensure stabilized idle speed.
(2) Idle speed while the air conditioner is being operated
When the engine coolant temperature is high with the air
conditioner switch in the ON position, the idle speed is set
higher than the basic idle speed.
,
ICoolant temperature “C VF)6FUO28:Position Control
When the steering wheel is turned or the air
conditioner switch is operated while idling, theachieve the target position, thus controlling the
engine load changes and consequently the idlebypass air volume and suppressing engine speed
changes. The engine control unit also activates the
speed changes sharply. Therefore, immediately
after detection of such a load signal, the engine
control unit activates the idle speed control servo toidle speed control servo to achieve the optimum
target position while cranking, driving and decelerat-
ing, according to the operating conditions.
Power steering oil
pressure switchIInhibitor
switch
IDash pot
concjition“D”
xl
rangeposition-
UP W-U
IAlPower
steeringposition-
UP.4~i~hnditioner
IIdle speed
control servor”--““IiiI
I
c
IEngine
I
I
1wuosu
-

FUEL SYSTEM -Idle Speed Control14-51
_ 0 (32)80 (175)Coolant temperature “C (“F)6FUO2653
ATarget position during operation
of the power steering systemIDLE CONTROL SERVO POSITION CONTROL WHEN THE
ENGINE IS IDLING
(1) Basic position
The basic position is preset as a map value Optimized
according to the engine coolant temperature. The idle
speed control servo is activated to conform to this position,
thereby maintaining the optimum idle speed.
This basic position of the idle control servo
diiectlycorresponds to the basic idle speed described earlier.
1II
0(32)
80(176)Coolant temperature
“C VW6FUO291Servo position
during operation of
the air conditioner
0(32)
80(176)Coolant temperature “C (“F)6FUO757
1L)760 (30)Barometric pressure mmHg
(in.Hg)BFUlOlC(2) Servo position during shift to “D” range
For models equipped with the automatic
transaxle.when
the position of the shift lever is anywhere other than the
“P” or “N” range, the servo position is increased in
proportion to the load of the torque-converter.
(3) Idle control servo position during operation of the power
steering system
When the power steering oil pressure switch is turned on
because the steering wheel is being turned while
thevehicle is stationary, the servo position is changed to
correspond to the increased power steering pump load.
(4) Servo position while the air conditioner is being operated
When the air conditioner switch is turned on, the servo
position is changed to correspond to the increased air
conditioner load.
(5) High altitude compensation
A correction is performed by increasing the opening of the
idle speed control servo to allow increasing bypass air flow
in order to compensate for the loss of intake air volume
(asmeasured by weight) caused by a reduction in intake air
density due to a drop in barometric pressure at increased
altitude.
(6) “Training” function
A “training” function that enters a value based upon the
engine rpm and the target rpm into the memon/,
andcorrects the servo position according to this value, is
provided in order to obtain an even higher degree of
precision of position control.

- -----.--..
14-76FUEL SYSTEM -Auto-cruise Control System
Ignition switch
IGI
9
RESUActuator electro-
Microcomputer
1 T 1
rn’Auto-cruise control unit
Autocruisecontrol switch
IGlMAIN
;FF -+++&Control unit
power supply
terminal voltage
03AO264NC: Normally closed
07*0040
AUTO-CRUISE CONTROL SWITCH
The auto-cruise control switch is built into the steering column
switch.MAIN SWITCH
The MAIN switch is an automatic reset type switch to turn ON
and OFF the power supply of the control unit.
COMMAND INPUT SWITCHES (SET and RESUME)
The SET and RESUME switches function to input the control
signals of the auto-cruise control system; both are the
automatic-reset type.
These switches are ON while pressed and OFF when released.
For the ECU’s input interface, each of the input terminals is
pulled up by the battery voltage; the terminal voltage is LOW
level
(OV) when the switch is ON, and is HIGH level (about 12V)when the switch is OFF. These voltage changes (digital
sig*)are input to the microcomputer as ON and OFF signals
o.:
switches.
.

19-I
POWER
_
GENERAL INFORMATION
.._ . . . . .
OIL PUMP ........................................................10POWER STEERING GEAR BOX

19-2 POWER STEERING
Rlh
integral rack and pinion type. This power steering
oear and the oil reservoir for effective cooling of
Fhe power steering fluid.The steering gear box is of a compact, light-weight

Steering
SYJo& assembly
oil pump
\Pressure hose
A

POWER STEERING- General Information19-3
SPEClFlCATlONSItems
Steering wheel O.D.
mm (in.)Steering wheel maximum turns
Shaft and joint type
Steering angleInner wheel
Outer wheel
Tilt strokemm
(in.1Steering gear type
Rack strokemm (in.)Oil pump type
Oil pump displacement
cm3/rev. (cu.in./rev.)Specifications
372
(14.6)
2.7
Collapsible, cross joints (two joints used)
35”OO’ + 2”
29”20’
30
(1.2)
Rack and pinion
138
(5.41
Vane type9.6
l.59)

19-4POWER STEERING - Tilt Steering Construction
TILT STEERING CONSTRUCTIONRlW
The tilt-steering mechanism is composed of the tilt
lever, tilt bracket, a plate, tilt bolts, etc. A tilt screw
is welded to the end of the tilt lever; at the two
ends, the left side of the tilt screw is right-threadedand the other is left-threaded. with the result that
the tilt bracket is sandwiched by the tilt bolts and
the plate part of the column when the tilt lever is
raised, thus securing the steering column.
13A0254Tilt bracket
Section A-A.
’Tilt screwfi Tilt lever13AO256
OPERATION OF THE TILT STEERING1. When the tilt lever is lowered to the free
position, the tilt screw turns in the direction of
ioosing, the tilt bolts that sandwiched the tilt
bracket move toward the outer side, and the
steering column sliding is then possible.
2.When the tilt lever is raised to the lock position,
the tilt screw turns in the direction of tightening
the tilt bolts move to the inner side, the
*“?bracket is pressed against the column’s
pi&and the steering column is secured.

.-. --POWER STEERING
- Power Steering Gear Box Construction19-5
-POWER STEERING GEAR BOX CONSTRUCTIONRlsJLIIUB,
ne steering gear box is of the rack and pinion type
with a built-in hydraulic control unit which uses a
compact and highly reliable rotary valve.The steering gear box, in the same way as the
manual steering gear box, is installed to the body by
way of the mounting rubber in order to reduce the
transmission of vibrations.
Section A-A
Beari
1-$ysy input shaft
To oilreservoir
LFrom oil
I’Rotary valve
Yoke spring
13A0257
Section B-B
From oil pumpTo oil reservoir
To cylinder tubeleft chamber
To cylinder tube
13A0077right chamber