oil pressure MITSUBISHI 3000GT 1991 Workshop Manual

AUTOMATIC TLE - General Information23-5
cF4A21 - Drive-Stopping>
Torque converter
Low-reverse
brake
Kickdown servo
Front clutchRear clutch -End clutch
jy ~&~ntroiun~t j
Damper clutchcontrol solencvalve
To lubrmtl(front)
Torque
I31
converterFcontrol ”valveEX
Pressure control
IPressurex^,?“t*,.l
* Y
4- - - - - _ _ _Oil filter
Lme reliefvalve
EX
Oil pan
Line pressure
0Torque converter and lubricationpressure
Reducing pressure
0 Modulated line pressure
IPressure control solenoid
valve pressure
[-
Damper clutch pressure
Damper clutch control solenoid
valve pressure
1 Drive(Stop) /TFA0242
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23-6AUTOMATIC TRANSAXLE - General Information

Kickdow:: servoILOWreverseIbraketront LlutLh
End clutch
IIII
rransaxk!, j p Ja
Damper Cllcmltrol SOlf
PII Iill
/I I%------=*To
lubrlcdtlon +(Wir)
TorqueCO”“Wtei
control
valv!?
ihlfr rontrolVllveI
, ,k.x
11 IPCP Rhln71, JI & \JPl i”‘4I,
PUW2
4; ;
LlrlC r&t.
1
: -VBIL’B
--_____E*n I6 ,S^_tI
Y$__.--
@II pan
[LIW pressure
Torque
cnnvertar and lubrication1 pressurs
/ 011 pump SUC!IO!l pressure
n Mod&ted 1x1~ pressurerDamper clutch coL&e pressure]
RedllCl!?g preswreElPressure contrcJ snlerloidwlve presslirs
psiizq
TFA0072
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15 II I b/ 0 ib1 ( fPIV

AUTOMATIC TRANSAXLE - General lnformatisn

Low-reverse
Kickdown servo
Torque converter
Front clutch
End clutch
‘ransaxleontrol unit
-3/4-3hift valve
I!Hear clutchexhaust valve
Damper
clutctcontrol solenovalveTo lubrlcatlon c(front):p,$matlon c
Torqueconvertercontrol 0svalveF
Shift control
valve
,:+
I,Ex E
IvePressure control‘2 valve
Pressure
N-R control
-7
i+----___Oil filter
H .j
\I:ovalve
EX
011 pan;tro’ j
Ire0 Oil pump suction pressureDamper clutchLine pressure
0 Modulated line pressureDamper clutchvalve pressureI solenoidTorque converter and lubrlcatlon
pressure
0Pressure ‘control solenoidvalve pressure Reducing pressure
I Reverse ITFA0077
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AUTOMATIC TRANSAXLE - Troubleshootincl23-19Based upon use of the troubleshooting
Checks should be made of fluid levels and
the condition of the ATF, as well as the
condition of the manual control cables;
adjustments should then be made if found
to be necessary.
If a presumption has been made that there
is an abnormal condition somewhere in
the electronic-control system, check the
fault code, in order to determine the
probable location of the problem, by using
a multi-use tester or voltmeter.
I
When the abnormal system is discovered,
check each element (sensors, etc.) one by
one, and make repairs as necessary.
IWhen the abnormal condition is presumed
to be in the oil-pressure-control system
When the result of the oil-pressure test
does not satisfy the specified pressure,
check each system at places related to the
valve body, check the oil-pressure pas-
sages for leakage, etc.
I
If the problem isunusually dirty ATF,
abnormal noises, oil leakage, or slippage of
the clutch or brakes, or an abnormal
condition of the transaxle itself, disassem-
ble and repair the transaxle.
TROUBLESHOOTINGM23EEAYFunctional malfunctions of the ELC4A/T can lead to other
problems, such as those described below:(I
) Improper maintenance and/or adjustments
(2) Malfunctions of the electronic control functions
(3) Malfunctions of mechanical functions
(4) Malfunctions of hydraulic control functions
(5) Malfunctions of engine performance
etc.
In order to properly determine (“Troubleshoot”) the source of
these malfunctions, it is first essential to methodically question
the user concerning the details of the problem, such as the
condition of the problem, the situation at the time the problem
occurred, and any other relevant information, all in as much
detail as possible. The user should also be asked whether or
not the problem has occurred more than once, and under what
conditions.
Subsequently, certain tests should be conducted in a certain
order, as described at the left.
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23-30AUTOMATIC TRANSAXLE - Troubleshooting
TRANSMISSION CONTROL UNIT
The connector has 42 pins to accommodate the increased number of senso.r inputs.
Here are the pin assignments.
uu
101.102.103.
104.105.
106.
107.
108.
109.
110.
1.
3':4.
Z:
i:9.10.11.
12.
13.
14.
15.
16.
17.
18.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.Damper clutch control solenoid valve
Shift control solenoid valve A
-Power source
Ground
Pressure control solenoid valve
Shift control solenoid valve B
. .
*Engine communrcatron srgnaiPower source
Ground
Ground
-Accelerator switch
-Diagnosis output terminal
Air-conditioner relay signal
Engine communication signal
Diagnosis control terminal
Engine communication signal
Power source (backup)Kickdown servo switch
Idle switch
oil temperature sensor (Low temperature side)
Oil temperature sensor (High temperature side)
Throttle position sensor
Sensor ground
Vehicle-speed reed switch
Inhibitor switch
(P)Inhibitor switch (R)Inhibitor switch (N)Inhibitor switch (D)
Inhibitor switch (2)
Inhibitor switch
(L)Overdrive switch
Pulse generator B
Pulse generator B
Pulse generator A
Pulse generator A
Ground
Ignition pulse
Power mode signal
TFA0360
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AUTOMATIC TRANSAXLE - Troubleshooting23-39
//!’ 6Rear@FrontclutchpressureI
@Kickdown brakeoressure (Release)
e
OIL PRESSURE TESTS1. Completely warm up the transaxle.
2.Raise the vehicle by using a jack so that the front wheels
can be rotated.
3. Connect an engine tachometer and place it in a position
where it’s easy to see.
4. Attach the special oil-pressure gauge (MD998330-01) and
the adaptor (MD998332-01) to each oil-pressure outlet port.
When the reverse pressure is to be tested, the 3,000
kPa(400 psi) type of gauge should be used.
5. Measure the oil pressure under various conditions, and
check to be sure that the measured results are within the
standard value range shown in the “Standard oil pressure
table” below.
If the oil pressure is not within the specified range, check
and repair as described in the section “Remedial steps if oil
pressure is not normal” on the next page.
STANDARD OIL PRESSURE TABLECondtttonsStandard
011 pressurekPa (PSI)No
SelectEngme
Red&g@000E%00leverspeedGearK/D brakeWD brakeFrontRearLow-TorqueposItlollvposltlon
pressurepressurepressureclutchclutchclutchreverseconverter
(application)(release)
pressurepressurepressurebrakepressure
pressure
1Nldlmg
Neutral
360 - 4808,(51 - 6812
Dldlmg
2nd
360
- 480100-210
730 -830k(51 - 68)
(14-30)
(104 -118)
3(SWFON,
Approx.
4th
360 480
830
-900
830
900
450-650
2,500(51 - 68) (118 128)(118 128)(64 92)
(SWZFF)Approx.
3rd
360 - 480
830
900830 -900 830 - 900
830 -900830
900
450-4
650-2.500(51 - 68)
(118
128)(118 -128) (118 - 128)
(118
128)(118128)
(64-921
52
Approx.
2nd
360
- 480
830--900
830 -900
450
650
2,500
(51 - 68)
(118-128)
(118 -128)
(64-921
Approx
1 st360 480
830 -900
300-450A1.000(51 - 68)
(118 -128)I43 .-64)
Approx.
Reverse
360 480
1.6402.2401.640 2.2401.640 -2.240450-6502.500(51 - 68)(233 - 319) (233 319)(233 319)(64 ~- 921
Approx.
Reverse
360
- 4801.500(213) 1.500 (213)1.500(213)
450~-650
1,000(51 - 68)or moreor moreor more(64 - 92)NOTE
(I)
-: Indicates pressure is below 10 kPa (1.4 psi).
(2)SW-ON: OD switch in ON position.
(3)SW-OFF: OD switch in OFF position.
(4)
a: Pressure IS not standard.
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23-40AUTOMATIC TRANSAXLE - Troubleshooting
REMEDIAL ACTION TO TAKE FOR INADEQUATE OIL PRESSURESymptom
Possible cause
Remedy
1. All line pressuresa. Plugged oil filter
are low (or high).b. Improperly adjusted regulatora. Visually check oil filter and replace it if plugged.
valve line pressure
b. Measure line pressure (2) (KID brake pres-
NOTE:sure) and readjust line pressure if it is
Line pressures areout of specifications.
@.@.@).@.@and @shown onc. Defective valve body assemblyOr, replace valve body assembly.
the Standard Oil
Pressure Table
on the preceding
paw.
d. Valve body left loose
e. Improper oil pump delivery.
pressurec. Replace valve body assembly.d. Torque valve body clamp bolt and mounting
bolt to specification.
e. Check oil pump gear side clearance and
replace oil pump assembly as necessary.
2. Improper reducing
a. Plugged reducing pressure
a. Disassemble valve body assembly to check
pressurecircuit filter (L-shaped)
b. Improperly adjusted reducingfilter and replace filter if it is plugged.
b. Measure reducing pressure @and readjust
pressure
c. Defective valve body assemblyas necessary.
c. Replace valve body assembly.
3. Improper K/D
brake pressure
(application)a. Defective seal ring
@ and D-ring @of K/D servo piston and seal ringa. Disassemble K/D servo and check seal ring
@of sleeveand D-ring for damage. Replace seal ringb. Defective valve body assemblyor D-ring if damaged or scratched.
b. Replace valve body assembly.
4. Improper KIDbrake pressure
(release)
J. Improper front
clutch pressurea. Defective seal ring
@ and D-ring @of K/D servo piston and seal ringa. Disassemble KID servo and check seal ring
@ of sleeveand D-ring for damage. Replace seal ring
b. Defective valve body assemblyor D-ring if damaged or scratched.b. Replace valve body assembly.
a. Defective seal ring @and D-ring
@of K/D servo piston and seal ringa. Disassemble K/D servo and check seal ring
@ of sleeveand D-ring for damage. Replace seal ringb. Defective valve body assemblyor D-ring if damaged or scratched.
c. Worn front clutch piston andb. Replace valve body assembly.c. Disassemble transaxle and check front clutch
retainer or defective D-ring @or seal ring @piston and retainer for wear and D-ring and
seal ring for damage. Replace piston, retainer,
D-ring, or seal ring as necessary.
3. Improper
rear clutch
pressure
7. Improper
end clutch
pressurea. Defective D-ring
@ of piston,
seal ring @ of retainer,
and seal ring @and D-ring @of input shaft
b. Defectrve valve body assembly
a. Defective seal ring
0. D-ring 0,and oil seal (iJ of end clutch
b. Defective valve body assemblya. Disassemble rear clutch and check input shaft
D-ring, center support seal ring, and piston
D-ring; replace if damaged or scratched.
b. Replace valve body assembly.
a. Disassemble the end clutch and check piston oil
seal, D-ring, and center support seal ring;
replace if damage or scratches are evident.
b. Replace valve body assembly.
8. Improper
low-reverse
brake pressurea. Damaged O-ring between valve
body and transmission
b. Defective valve body assemblyc. Defective D-ring @of piston
or O-ring
@I of center supporta. Remove valve body assembly and check O-ring
on top of upper valve body; replace if damage
or scratches are evident.
b. Replace valve body assembly.
c. Disassemble transaxle and check D-ring and
O-ring; replace if damage or scratches are eviden
3. Improper
torque converter
pressurea. Sticking damper clutch controla. Check damper clutch system and DCCSV
solenoid valve (DCCSV) or damper
for operation.
clutch control valve
b. Plugged or leaky oil cooler and
pipingsb. Repair or replace cooler or pipings.
c. Damaged seal ring @of input shaftc. Disassemble transaxle and check seal ring;
d. Defective torque converterreplace if it is damaged.
d. Replace torque converter.
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d
‘\
d

23-48AUTOMATIC TRANSAXLE - Service Adjustment Procedures
Adjusting screw4
or~0\====m00~7/IIIITFAm
c-1
Pi(8) Tighten lock nut by hand until it contacts piston. Then, using
torque wrench, tighten to specification.
Lock nut: 29 Nm (21
ftlbs.)Caution
Use of socket wrench or torque wrench could result in
lock nut being turned with adjust rod.
(9) Remove the special tool to secure the piston and torque
plug to specification at L/R brake pressure take-up port.
LINE PRESSURE ADJUSTMENT
(I) Discharge AFT.
(2) Remove oil pan.
(3) Remove oil filter.
(4) Remove oil temperature sensor.
M23FSAC(5) Press solenoid valve harness grommet catch to push in
grommet; then, remove valve body assembly.
Caution
Do not let manual valve fall.
(6) Turn adjusting screw of regulator valve to obtain the
specified line pressure
(K/D brake pressure).
Standard value:870
- 890 kPa (124 - 127 psi)
Oil pressure change for
each turn of adjustment screw:38
kPa (54 psi)
(7)Check that an O-ring is fitted at the location shown on top off
valve body.
(8) Replace O-ring of solenoid valve intermediate grommet
with a new one and then fit the O-ring into case.6
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AUTOMATIC TRANSAXLE - Service Adjustment Procedures23-49
1(9) Install valve body and oil temperature sensor.
Bolt A
= Length 18 mm (.709 in.)
Bolt B
= Length 25 mm (.984 in.)
Bolt C
= Length 40 mm (1.575 in.)
CautionSecure solenoid valve and oil temperature sensor
harness at locations shown.
(1O)lnstall oil filter.(1l)lnstall new oil pan gasket and oil pan.
(12)Add the specified amount of ATF.
(13)Carry out hydraulic test.
Readjust as necessary.
REDUCING PRESSURE ADJUSTMENTh323FfADWhen multi-use tester is not used
(1) Following the same steps as those in line pressure
adjustment, remove parts up to oil filter.
There is no need to remove valve body.
(2) Turn adjusting screw of lower valve body to obtain the
specified reducing pressure. Turn it counterclockwise to
increase the pressure.
Standard value:425 f 10 kPa (60 f 1 psi)
Oil pressure change for
each turn of adjusting screw:45 kPa (6 psi)(3) In the same way as in line pressure adjustment,
/nstall oil
filter and oil pan.
(4) Perform hydraulic test.
Adjust as necessary.
When multi-use tester is used
(1) Adjust to obtain the specified K/D brake pressure when PC
solenoid is energized at duty 50% with the multi-use tester.
Standard value:275 kPa (39 psi)
Oil pressure change for
each turn of adjusting screw:50 kPa (7 psi)(2) After adjustment has been made, check that the recuding
pressure is in the range 360
- 480 kPa (51 - 68 psi).
Caution
This adjustment should be made with oil temperature70
- 80°C (160 - 180°F).
The adjustment made with high oil temperature couldresult in improper adjustment due to a line pressure
drop at idle.
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i
LJ
AUTOMATIC TRANSAXLE - Transaxle Assembly
DISASSEMBLY AND REASSEMBLY23-65
M23LEAN
11
Z:4.
::
;:9.10.11.
12.
13.
14.
15.
16.8
%&,kd!~~ / I!- 1A8 ii9
-114Torque converter~.I~I~~~ assembly
Thrust washer
#IFront clutch assembly
Thrust race #3
Thrust bearing #4Thrust washer #2Rear clutch assemblyThrust bearing #5Rear clutch hubThrust race #6Thrust bearing #7Kickdown bandKickdown drumSnap ring
17.Center support18.Wave spring19.Return spring
20.Pressure plate21.Brake disc
22.Brake plate
23.Reaction plate
24. Reverse sun gear
25. Thrust bearing #8
26. Thrust race #927. Forward sun gear
28. Planetary carrier asseml
29.Thrust bearing #I030.Output flange
31. Oil level gauge
32. Oil filler tube33.Snap ring34. Kickdown servo switch35.Snap ring26
25
24
TFA040936.
Kickdown servo piston37.Spring
38.Anchor rod39.Detent assembly
40. Manual control shaft
41. Parking roller support
42.Oilpan43.Gasket44. Oil temperature sensor45.Oil screen46. Valve body assembly
47. Manual control lever
48.Inhibitor switch
49. End clutch shaft
50.Bearing retainer51.Thrust bearing #I1
52. End clutch hub53.Thrust washer
54. End clutch assembly
55.O-ring56. End clutch cover57.Pulse generator
58:Lock bolt
59.Idler shaft
60.Idlergear
61.Spacer
62.Gasket
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