1991 MITSUBISHI 3000GT low oil pressure

AUTOMATIC TRANSAXLE - General Information23-3HYDRAULIC CONTROL SYSTEM

i
Low-reversehr3b.3\t3ear clutch “IYhFI\\\\\\1
,/I // L1 ji‘erhaustvalve7 ;// j/ .j/,
Damper cluGcontrol solenoidvalve
To lubncatlon(front) cTo lubncatlon ,-=(rear)
Torquel-2 shift
valvek&!&!&I h TransaxldI e 1 11
---- il.valve
I 1 Shik control I!:;?A+;ilEjJJBi,
IIsolenoid
valve “6”S3ivcontroI
I/
i %
\sl
valve
Ex[ 011 filter J
011 pan
m Line pressure
-Tyue converter and lubricationsure
-_ucing pressureOil pump suction pressure
a Modulated line pressure
I”‘rl Damper clutch pressure
mDamper clutch control solenoid
valve pressure
IPressure control solenoidvalve pressureTFA0070
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23-4AUTOMATIC TRANSAXLE - General information

Tort-
CCvJ
Kickdown servo--
Low-reversebrake
Rear clutch Front clutch
F12/
!P
End clutchii
/
Ii”
t
OFF
z7szzz
10-IF=?
OFF
snort controlvalve
1'7 H I-------i II/
IIjamper clutcontrol solerwualveTo lubrrcatron c(front)To lubrrcatton c(rear)ReducingL valve
IIsolenoidvalve “B”
Pressure control
N-R control
valve
Pressurecontrol
OFFsolenord
m Oil pump suction pressure
0 Modulated line pressure
0 Damper clutch pressure
@gjJDamper clutch control solenoid
valve pressure
IPressure control solenoid
valve pressure
m Lrne pressure
0Torque converter and lubricationpressure
Reducing pressureTFA0071
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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
1 TSB Revision

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
1 TSB ,RevisionI

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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