1990 MITSUBISHI ECLIPSE clutch

-21-54AUTOMATIC TRANSAXLE
- Transaxle Control
Output code
Diagnosis item
Remarks
JO.Display pattern
Open circuit in pressure control solenoid
Fail-safe item
a5 nnnn valveShort circuit in pressure control solenoid
Fail-safe item
46 m valve12A0105Damaged or disconnected wiring of theDuty control is stopped after
47 nnru7_nnnnnnndamper clutch control solenoid valvegeneration.
Short-circuit of the damper clutch controlDuty control is stopped after
48 m solenord valvegeneration.
Malfunction of the damper clutch controlDuty control is stopped after
49 J- systemgeneration.
1 st gear out of synchronizationFail-safe item
51n
2nd gear out of synchronizationFail-safe iteml52n
3rd gear out of synchronizationFail-safe item
53 m4th gear out of synchronization
Fail-safe item
54
uuum12Ao106

AUTOMATIC TRANSAXLE - Transaxle Control21-55HYDRAULIC CONTROL SYSTEM
Reaction shaft
support
BushingThe hydraulic control system consists of an oil pump which
generates hydraulic pressure for the system, and valves and
solenoid valves to control the pressure or switch the oil
passages. The valves and solenoid valves are all built in the
valve body.
OIL PUMPOil pump generates the pressure for supplying oil to the torque
converter, for lubricating frictional parts of the planetary gear
set and the overrunning clutch, etc., and for activating the
hydraulic control system.
The pump is of the inner-teeth engaging involute gear type. It
always generates the oil pressure when the engine is running
since the drive gear
is driven by 2 pawls of the pump drive hub
welded at the center of the torque converter shell.

/ii>--..AUTOMATIC TRANSAXLE
- Transaxle Control21-59
Sxxrolvalve175022E
6
LmeFrom
TooilFrompressure torque- pump 2;0%conver-
termntrd
valveDAMPER CLUTCH CONTROL VALVE AND DAMPER
CLUTCH CONTROL SOLENOID VALVE
Damper Clutch Control Valve
The damper clutch control valve is installed within the lower
valve body; it functions to regulate the hydraulic pressure
acting upon the damper clutch (incorporated within thetorqueconverter).
Damper Clutch Control Solenoid Valve
The damper clutch control solenoid valve is duty-controlled by
the signals from the transaxle control unit; this valve functions
to convert electric signals to hydraulic pressure.
Operation
(1) Because reducing pressure is applied to the
23rd line and
line
23a when the damper clutch is released, the sum of
the hydraulic pressure acting on the
# 1 land plus the spring
force overcomes the hydraulic pressure applied to the
#5land and
#6 land surface areas, thus causing the valve to
be moved toward the right.
When this happens, the hydraulic pressure from the
torqueconverter control valve enters from the 3rd line to
the 25th line, and hydraulic pressure is supplied between
the front cover of the torque-converter and the damper
clutch.As a result, the damper clutch is not activated, and
operation is the same as that of an ordinary torque-
converter.(2) When both throttle opening and vehicle speed reached the
damper clutch activation area, the damper clutch control
solenoid valve is duty-controlled by commands from the
transaxle control unit, thereby reducing the hydraulic
pressure applied to the
# 1 land left side.
As a result, the sum of the hydraulic pressure acting on the
# 1 land plus the spring force is overcome by the hydraulic
pressure applied to the
#5 land and #6 land surface areas,
thus causing the valve to be moved toward the left.
When this happens, the hydraulic pressure from the
torque-converter control valve passes through from the
3rdline to the
26th line, and through the oil cooler, and, at the
same time, the line pressure of the 1
st line passes through
the 27th line and enters the torque-converter from the 24th
line, thus causing hydraulic pressure to be applied between
the damper clutch and the turbine, with the result that the
damper clutch is pressed against the front cover, thus
activating the damper clutch.

AUTOMATIC TRANSAXLE - Transaxle Control
.-i:...
21-63To front clutch
Ex ExManual valve
To low/reverse brake
Pressure controlsolenoid valve
1750089
t ‘The hydraulic control system incorporates a “fail1
1safe feature” which prevents the gear shift from shift the selector lever from a forward drive range to
irthe reverse range while driving. This function is
:5activated when the vehicle is running at a speed of 7km/h (4.3 mph) or higher.
;If the selector lever is shifted into the “R” position.
*the transaxle control unit activates the pressure
:control solenoid valve to release the reducing
! ,-pressure. Once the reducing pressure drops, the.-a.rr./ -. jF! ;;1 ;I~N-R control valve is moved toward the right by the
spring force. This closes the No.9 port and causes
the pressure in passage 16 to be released. When
the pressure in passage 16 is released. the check
ball is forced against the right-hand port opening,
thus shutting off the line pressure. As a result, the
low-reverse brake is released. Although the front
clutch is engaged in this situation, the transaxle
cannot transmit the reverse driving power unless
the low-reverse brake is applied. Therefore, when
the transaxle is placed under the abovementioned
condition, it is the same as when it is in neutral.
c

AUTOMATIC TRANSAXLE - Transaxle Control21-65Shift contra
solenoid val
Shift control valve
To N-Dcontrol valve
To rearclutch
t
Line pressure
-1750231
s.When the manual valve is shifted to the “D”, “2” or
GL” range position, the transaxle control unit acti-
Yates both shift control solenoid valves “A” and
3”. In this situation where both valves are acti-
pted, the line pressure from the manual valve is
released, and as
a,Tesult no pressure is directed to
the
5a and 5b ports.
.IMeanwhile, the line pressure from the manual valve
remains applied between the lands of the shift
control valve as mentioned previously. pushing the
valve to the left against the plug.
The line pressure is directly applied through theNo.5 port of the manual valve to the rear clutch
which is engaged during
1st gear.
1::

/
1. .)
21-66
2nd GearAUTOMATIC TRANSAXLE
- Transaxie Control
Plug ’
- 2nd pressure‘:“,,tol, 2 shift
Stopper
To N-Dcontrol valve
To rearclutch -.
Line pressure
175023:The transaxle control unit deactivates the shift
control solenoid valve “A” and activates the shift
control solenoid valve
“B”. When the shift control
solnoid valve “A” is deactivated, the line pressure
directed-through the
No.5a ports is applied to the
plugs at-both ends of the shift control valve, pushingthe left plug to the right and the right plug to the
lef’until they are blocked by the stoppers.
The rightward movement of the left plug forces
theshift control valve also to the right. This opens
theNo.6 port, allowing the line pressure to the
directecto the
l-2 shift valve and the end clutch valve
This pressure is called
“2nd pressure”.

3rd GearAUTOMATIC TRANSAXLE
- Transaxle Control21-67
control unitShift control
solenoid
vail
ExII5a
PlugShift control valve
‘F$&‘- - 2nd pressure
wkh- 3rd pressure
Stopper
Line pressure
rolunit deactivates the shift
ves“A” and “B”.hift control solenoid valve “A”
ure to be applied to the No.5a
forces both right and left plugs
To N-D
control
To rearclutchvalve
1750234Deactivation of the shift control solenoid valve
“B”allows pressure to be directed to the shift control
valve through the No.5b port. This forces the shift
control valve to the right until it comes in contact
with the right plug. When the shift control valve is in
this position, the No.7 port is opened and the line
pressure is directed through the port to the
2-3/4-3 shift valve and the end clutch valve.
This pressure is called
“3rd pressure”.

__- _ - __ ----____. _ ., _.- -....21-684th GearAUTOMATIC TRANSAXLE
- Transaxle Control
solenoid valve “8”
4th pressure
Icontrol unit
2nd pressure
3rd pressure
Shift control
valviI!
iEx
To N-Dcontrol valve
To rearclutch
Lme pressure
1750233
The transaxle control unit activates the shift control
solenoid valve “A” and deactivates the shift control
solenoid valve
“B”.Activation of the shift control solenoid valve “A”
releases-the pressure at the No.5a ports, which in
turn releases the pressure acting on the plugs at the
right and left of the shift control valve.Deactivation of the shift control solenoid valve
“B”results in rightward movement of both the
shiftcontrol valve and the right plug by line
pressureapplied through the No.5b port until the valve
isblocked by the stopper. This rightward movemeni
of the shift control valve opens the No.8 port ant
the line pressure is directed to the rear clutcr
exhaust valve.
This pressure is called
“4th pressure”.