low oil pressure TOYOTA SUPRA 1995 Service Repair Manual

CAUTION:
wBe sure to connect both the high and low pressure
quick±connectors onto the A/C system when evacuating.
If only one side is connected, the system would be open
to atmosphere through the other connector, making it
impossible to maintain vacuum.
wBe sure to turn off the manifold gauge valve immediately
after evacuating the system. Then you may switch off the
vacuum pump.
PRECAUTIONS WHEN CHARGING
REFRIGERANT
1. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH
REFRIGERANT IN REFRIGERANT SYSTEM
If there is not enough refrigerant in the refrigerant system, oil
lubrication will be insufficient and compressor burnout may
occur, so take care to avoid this.
2. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILST COMPRESSOR IS OPERATING
If the high pressure valve is opened, refrigerant flows in the
reverse direction and could cause the charging cylinder to
rupture, so open and close the low pressure valve only.
3. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as in-
sufficient cooling, poor fuel economy, engine overheating
etc.
SUPPLEMENTAL RESTRAINT SYSTEM
(SRS)
Failure to carry out service operations in the correct se-
quence could cause the supplemental restraint system to
deploy, possibly leading to a serious accident.
During removal or installation of the parts and the yellow wire
harness and connector for the airbag is necessary, refer to
the precautionary notices in the RS section before carrying
out operation. AC±6
± AIR CONDITIONING SYSTEMGENERAL DESCRIPTION

6. REFRIGERANT OVERCHARGE OR INSUFFICIENT COOLING OF CONDENSER
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Clean condenser
(2) Check fan motor
operation
(3) If (1) and (2) are in
normal state, check
amount of refrigerant
Charge proper amount
of refrigerant
Pressure too high on both
low and high pressure
sides

No air bubbles seen
through the sight of glass
even when the engine
rpm is lowered.
Unable to develop
sufficient performance
due to excessive
refrigerant in system

Insufficient cooling of
condenser
Excessive refrigerant in
in cycle " refrigerant
overcharged

Condenser cooling
insufficient " condenser
fins clogged or fan motor
faulty
Condition: Insufficient Cooling
7. AIR PRESENT IN REFRIGERATION SYSTEM
Condition: insufficient cooling
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
(1) Check compressor oil to
see if dirty or insufficient
(2) Evacuate air and charge
new refrigerant
Pressure too high on both
low and high pressure
sides

The low pressure piping is
hot to the touch

Bubbles seen in sight
glass
Air entered in
refrigeration system
Air present in
refrigeration system
NOTE: These gauge indications are shown when the refrigeration
system has been opened and the refrigerant charged without
vacuum purging.

Insufficient vacuum
purging
AC±74± AIR CONDITIONING SYSTEMTROUBLESHOOTING

EXPANSION VALVE
ON±VEHICLE INSPECTION
1. CHECK QUANTITY OF GAS DURING REFRIGERATION
CYCLE
2. INSTALL MANIFOLD GAUGE SET
3. RUN ENGINE
Run the engine at 1,500 rpm for at least 5 minutes. Then
check that the high pressure reading is 1.371.57 MPa (14±16
kgf/cm
2, 199±228 psi).
4. CHECK EXPANSION VALVE
If the expansion valve is faulty, the low pressure reading will
drop to 0 kPa (0 kgf/cm
2, 0 psi).
HINT: When the low pressure drops to 0 kPa (0 kgf/cm
2, 0
psi), feel the receiver's IN and OUT sides for zero tempera-
ture difference.
EXPANSION VALVE REMOVAL
1. REMOVE EVAPORATOR
(See page AC±82)
2. REMOVE EXPANSION VALVE
Using a hexagon wrench, remove the 2 bolts and separate
the evaporator and expansion valve.
Torque: 5.4 NVm (55 kgfVcm, 48 in.Vlbf)
INSTALLATION HINT: Lubricate the new O±ring with com-
pressor oil and install the tubes.
EXPANSION VALVE INSTALLATION
Installation is in the reverse order of removal. AC±98
± AIR CONDITIONING SYSTEMEXPANSION VALVE

A340E(Others) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340E(Others) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-29
First and Reverse Brake
Pack clearance0.60 - 1.12 mm 0.0236 -0.0441 in.
Flange thickness No.50
No.51
No.52
No.53
No.54
No.555.0 mm 0.197 in.
4.8 mm 0.189 in.
4.6 mm 0.181 in.
4.4 mm 0.173 in.
4.2 mm 0.165 in.
4.0 mm 0.157 in.
Rear Planetary Gear
Planetary pinion gear thrust clearance Standard
Maximum0.20 - 0.60 mm 0.0079 - 0.0236 in.
1.00 mm 0.0394 in.
Valve Body Spring
SpringFree length and Coil outer
diameter mm (in.)Total No. of coils and Color
Upper valve body
Secondary regulator valve30.9 (1.217) 11.2 (0.441)10.5 Blue
Lock-up relay valve21.4 (0.843) 5.5 (0.217)17.5 Light Gray
3 - 4 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Down shift plug27.3 (1.075) 8.7 (0.343)12.5 Yellow
Throttle valve20.6 (0.811) 9.2 (0.362)
or 23.3 (0.917) 9.2 (0.362)9.5 Blue
9.5 White
SUPRA, PREVIA
Second coast modulator valve24.6 (0.967) 8.3 (0.327)9.0 Orange
OTHERS
Second coast modulator valve25.3 (0.996) 8.6 (0.339)9.5 Orange
Cut-back valve21.8 (0.858) 6.0 (0.236)13.5 Red
2 - 3 shift valve30.8 (1.213) 9.7 (0.382)10.5 Blue
SUPRA, PREVIA
Low coast modulator valve26.4 (1.039) 8.3 (0.327)10.5 Yellow
OTHERS
Low coast modulator valve30.4 (1.197) 8.3 (0.327)10.5 Yellow
Lower valve body
Check valve20.2 (0.796) 12.1 (0.476)6.5 None
Pressure relief valve11.2 (0.441) 6.4 (0.252)7.5 None
1 - 2 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Primary regulator valve62.3 (2.453) 18.6 (0.732)12.5 Purple
SUPRA
Accumulator control valve36.1 (1.421) 8.9 (0.327)14.0 White
OTHERS
Accumulator control valve33.9 (1.335) 8.8 (0.346)12.0 Pink

A340H AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340H AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-35
Valve Body Spring
SpringFree length and Coil outer
diameter mm (in.)Total No. of coils and Color
Upper valve body
Secondary regulator valve30.9 (1.217) 11.2 (0.441)10.5 Blue
Lock-up relay valve21.4 (0.843) 5.5 (0.217)17.5 Light Gray
3 - 4 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Down shift plug27.3 (1.075) 8.7 (0.343)12.5 Yellow
Throttle valve20.6 (0.811) 9.2 (0.362)
or 23.3 (0.917) 9.2 (0.362)9.5 Blue
9.5 White
Second coast modulator valve25.3 (0.996) 8.6 (0.339)11.5 Orange
Cut-back valve21.8 (0.858) 6.0 (0.236)13.5 Red
2 - 3 shift valve30.8 (1.213) 9.7 (0.382)10.5 Blue
Low coast modulator valve30.4 (1.197) 8.3 (0.327)10.5Light Green
Lower valve body
Check valve20.2 (0.796) 12.1 (0.476)6.5 None
Pressure relief valve11.2 (0.441) 6.4 (0.252)7.5 None
1 - 2 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Primary regulator valve62.3 (2.453) 18.6 (0.732)12.5 Purple
Accumulator control valve33.9 (1.335) 8.8 (0.346)12.0 Pink
Valve Body Key
KeyHeight
mm (in.)Width
mm (in.)Thickness
mm (in.)
Upper valve body
Low coast modulator valve14.5 (0.571)5.0 (0.197)3.2 (0.126)
2 - 3 shift valve14.0 (0.551)5.0 (0.197)3.2 (0.126)
Cut-back valve15.0 (0.591)5.0 (0.197)3.2 (0.126)
Secondary regulator valve14.0 (0.551)5.0 (0.197)3.2 (0.126)
Lock-up relay valve21.2 (0.835)5.0 (0.197)3.2 (0.126)
3 - 4 shift valve16.5 (0.650)5.0 (0.197)3.2 (0.126)
2nd coast modulator valve16.5 (0.650)5.0 (0.197)3.2 (0.126)
Lower valve body
Accumulator control valve21.2 (0.835)5.0 (0.197)3.2 (0.126)
1 - 2 shift valve16.5 (0.650)5.0 (0.197)3.2 (0.126)
Primary regulator valve16.2 (0.638)5.0 (0.197)3.2 (0.126)
Output Shaft
Thrust play0.27 - 0.86 mm 0.0106 - 0.0339 in.

A340H AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-38
TORQUE SPECIFICATION
Part tightenedN´mkgf´cmft´lbf
Stator shaft x Oil pump body101007
Upper valve body x Lower valve body6.46556 in.´lbf
Detent spring x Valve body101007
Transfer lower valve body x Transfer center valve body6.46556 in.´lbf
Transfer center valve body x Transfer upper valve body6.46556 in.´lbf
Transfer upper valve body x Transfer lower valve body6.46556 in.´lbf
No.4 solenoid x Valve body101007
Transfer pressure switch x Valve body6.97061 in.´lbf
Transfer oil strainer x Transfer chain rear case6.97061 in.´lbf
Transfer oil pump x Transfer oil pump cover101007
Oil pump x Transmission case2222016
Parking lock pawl bracket7.47565 in.´lbf
Transfer case x Transmission case3434525
Transfer front support x Transfer case3434525
Transfer chain front case x Transfer case3434525
Oil receiver x Transfer chain front case101007
Transfer chain front case x Transfer chain rear case3434525
Transfer oil pump x Transfer chain rear case1616012
Transfer extension housing x Transfer chain rear case3434525
Front companion flange1231,25090
Rear companion flange1231,25090
Overdrive case x Transmission case2526019
Valve body x Transmission case101007
Oil strainer case x Valve body101007
Oil strainer case x Oil strainer6.97061 in.´lbf
Transfer valve body x Transfer case101007
Transfer oil pan x Transfer case7.47565 in.´lbf
Transfer position switch3.94035 in.´lbf
Transfer control shaft lever1616012
Speedometer drive gear16160
12


Transfer oil cooler tube3434525
Transmission fluid temperature sensor1515011
Transfer fluid temperature sensor1515011
Transmission oil pan x Transmission case7.47565 in.´lbf
Transmission housing 14 mm bolt
17 mm bolt34
57345
58025
42
Union2930022
Park/Neutral position switch6.97061 in.´lbf
Park/Neutral position switch adjusting bolt131309
Control shaft lever1616012
AT06Q-08

A340F AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340F AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-41
Valve Body Spring
SpringFree length and Coil outer
diameter mm (in.)Total No. of coils and Color
Upper valve body
Secondary regulator valve30.9 (1.217) 11.2 (0.441)10.5 Blue
Lock-up relay valve21.4 (0.843) 5.5 (0.217)17.5 Light Gray
3 - 4 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Down shift plug27.3 (1.075) 8.7 (0.343)12.5 Yellow
Throttle valve20.6 (0.811) 9.2 (0.362)
or 23.3 (0.917) 9.2 (0.362)9.5 Blue
9.5 White
Second coast modulator valve25.3 (0.996) 8.6 (0.339)11.5 Orange
Cut-back valve21.8 (0.858) 6.0 (0.236)13.5 Red
2 - 3 shift valve30.8 (1.213) 9.7 (0.382)10.5 Blue
Low coast modulator valve30.4 (1.197) 8.3 (0.327)10.5Light Green
Lower valve body
Check valve20.2 (0.796) 12.1 (0.476)6.5 None
Pressure relief valve11.2 (0.441) 6.4 (0.252)7.5 None
1 - 2 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Primary regulator valve62.3 (2.453) 18.6 (0.732)12.5 Purple
Accumulator control valve33.9 (1.335) 8.8 (0.346)12.0 Pink
Valve Body Key
KeyHeight
mm (in.)Width
mm (in.)Thickness
mm (in.)
Upper valve body
Low coast modulator valve14.5 (0.571)5.0 (0.197)3.2 (0.126)
2 - 3 shift valve14.0 (0.551)5.0 (0.197)3.2 (0.126)
Cut-back valve15.0 (0.591)5.0 (0.197)3.2 (0.126)
Secondary regulator valve14.0 (0.551)5.0 (0.197)3.2 (0.126)
Lock-up relay valve21.2 (0.835)5.0 (0.197)3.2 (0.126)
3 - 4 shift valve16.5 (0.650)5.0 (0.197)3.2 (0.126)
2nd coast modulator valve16.5 (0.650)5.0 (0.197)3.2 (0.126)
Lower valve body
Accumulator control valve21.2 (0.835)5.0 (0.197)3.2 (0.126)
1 - 2 shift valve16.5 (0.650)6.0 (0.236)3.2 (0.126)
Primary regulator valve16.2 (0.638)5.0 (0.197)3.2 (0.126)
Transmission Case
Transmission case bushing Maximum38.19 mm 1.5035 in.
Output Shaft
Thrust play0.27 - 0.86 mm 0.0106 - 0.0339 in.
Accumulator Spring
Spring (Color)Free length mm (in.)Outer diameter mm(in.)
B2(Yellow)70.5 (2.776)19.7 (0.776)
C2(Blue)68.5 (2.698)20.2 (0.795)
B0(Light Green)69.7 (2.744)16.7 (0.657)
C0(White)67.0 (2.638)17.8 (0.701)

A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONLOWER VALVE BODY -
AT-85
VALVE BODY ASSEMBLY
1. INSTALL ASSEMBLED GASKETS ON UPPER VALVE
BODY
Align the assembled gaskets with each bolt hole and
install the screw.
2. PLACE UPPER VALVE BODY WITH GASKETS ON
TOP OF LOWER VALVE BODY
Align each bolt hole and gaskets in the valve body.
3. INSTALL 28 BOLTS TO UPPER VALVE BODY
HINT: Each bolt length (mm, in.) is indicated below.
Torque: 6.5 N´m (65 kgf´cm, 56 in.´lbf)
Bolt length:
Bolt A: 45 mm (1.772 in.)
Bolt B: 35 mm (1.378 in.)
Bolt C: 20 mm (0.787 in.)
4. INSTALL NO.5 SOLENOID VALVE
5. TURN OVER ASSEMBLY INSTALL OIL STRAINER
AND PRESSURE RELIEF VALVE
AT0PV-02

A340E(Others) AUTOMATIC TRANSMISSIONOPERATION -
AT-8
3. HYDRAULIC CONTROL SYSTEM
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, and the
clutches and brakes, as well as the fluid passages which connect all of these components. Based on
the hydraulic pressure created by the oil pump, the hydraulic control system governs the hydraulic pres-
sure acting on the torque converter clutch, clutches and brakes in accordance with the vehicle driving
conditions.
There are 3 solenoid valves on the valve body.
The No.1 and No.2 solenoid valves are turned on and off by signals from the ECM to operate the shift
valves and change the gear shift position.
The lock-up solenoid valve is operated by signals from the ECM to engage or disengage the lock-up
clutch of the torque converter clutch.

LINE PRESSURE
Line pressure is the most basic and important pressure used in the automatic transmission, because
it is used to operate all of the clutches and brakes in the transmission.
If the primary regulator valve does not operate correctly, line pressure will be either too high or too low.
Line pressure that is too high will lead to shifting shock and consequent engine power loss due to the
greater effort required of the oil pump; line pressure that is too low will cause slippage of clutches and
brakes, which will, in extreme cases, prevent the vehicle from moving. Therefore, if either of these prob-
lems are noted, the line pressure should be measured to see if it is within specification.

THROTTLE PRESSURE
Throttle pressure is always kept in accordance with the opening angle of the engine throttle valve. This
throttle pressure acts on the primary regulator valve and, the line pressure is regulated according to
the throttle valve opening.
In the hydraulically controlled automatic transmission, throttle pressure is used for regulating line pres-
sure and as signal pressure for up-shift and down-shift of the transmission. In the electronically con-
trolled transmission, however, throttle pressure is used only for regulating line pressure. Consequently,
improper adjustment of the transmission throttle cable may result in a line pressure that is too high or
too low. This, in turn, will lead to shifting shock or clutch and brake slippage.

A340E(Others) AUTOMATIC TRANSMISSIONLOWER VALVE BODY - A340E(Others) AUTOMATIC TRANSMISSIONLOWER VALVE BODY -
AT-99
VALVE BODY SPRING SPECIFICATIONS
HINT: During reassembly please refer to the spring specifications below to help you to identify the differ-
ent springs.
MarkName (Color)Free length / Outer diameter
mm (in.)Total No. of coils
(A)Check valve (None)20.2 (0.796) / 12.1 (0.476)6.5
(B)Pressure relief valve (None)11.2 (0.441) / 6.4 (0.252)7.5
(C)1-2 shift valve (Purple)30.8 (1.213) / 9.7 (0.382)10.5
(D)Primary regulator valve (Purple)62.3 (2.453) / 18.6 (0.732)12.5
(E)SUPRA
Accumulator control valve (White)36.1 (1.421) / 8.9 (0.327)14.0
(E)OTHERS
Accumulator control valve (Pink)33.9 (1.335) / 8.8 (0.346)12.0
AT06G-04