1995 TOYOTA SUPRA Service Repair Manual

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Page 385 of 2543

TOYOTA SUPRA 1995 Service Repair Manual A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS INSTALLATION -
AT-128
43. INSTALL UNION AND ELBOW
(a) Coat the new O-rings with ATF and install them to union
and elbow.
(b) Install the front unio

Page 386 of 2543

TOYOTA SUPRA 1995 Service Repair Manual A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS INSTALLATION -
AT-129
46. INSTALL CONTROL SHAFT LEVER
Torque: 16 N´m (160 kgf´cm, 12 ft´lbf)
47. SUPRA, PREVIA:
INSTALL WIRE HARNESS CLAMP AND T

Page 387 of 2543

TOYOTA SUPRA 1995 Service Repair Manual A340E (2JZ±GE)
AUTOMATIC TRANSMISSION
AT1±1

Page 388 of 2543

TOYOTA SUPRA 1995 Service Repair Manual OPERATION
FUNCTION OF COMPONENTS
* Down±shift only±no up±shift AT1±2
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATION

Page 389 of 2543

TOYOTA SUPRA 1995 Service Repair Manual COMPONENT FUNCTION
O/D Direct Clutch (C0) Connects overdri

COMPONENT FUNCTION
O/D Direct Clutch (C0) Connects overdrive sun gear and overdrive carrier

O/D Brake (B0)
Prevents overdrive sun gear from turning either clockwise or counterclockwise

O/D One±Way Clutch (F0)

When transmission is being driven by engine, connects overdrive sun gear and
overdrive carrier
Forward Clutch (C1) Connects input shaft and front planetary ring gear
Direct Clutch (C2) Connects input shaft and front & rear planetary sun gear

2nd Coast Brake (B1)

Prevents front & rear planetary sun gear from turning either clockwise or coun-
terclockwise

2nd Brake (B2)

Prevents outer race of F1 from turning either clockwise or counterclockwise,
thus preventing front & rear planetary sun gear from turning counterclockwise

1st & Reverse Brake (B3)

Prevents rear planetary carrier from turning either clockwise or counterclock-
wise

No. 1 One±Way Clutch (F1)

When B2 is operating, prevents front & rear planetary sun gear from turning
counterclockwise
No. 2 One±Way Clutch (F2) Prevents rear planetary carrier from turning coiunterclockwise
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATIONAT1±3

Page 390 of 2543

TOYOTA SUPRA 1995 Service Repair Manual AT1±4± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATION

Page 391 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATIONAT1±5

Page 392 of 2543

TOYOTA SUPRA 1995 Service Repair Manual 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 t

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 pressure
acting on the torque converter clutch, clutches and brakes in accordance with the vehicle driving condi-
tions.
There are three solenoid valves on the valve body. These solenoid valves are turned on and off by signals
from the ECM to operate the shift valves. These shift valves then switch the fluid passages so that fluid
goes to the torque converter clutch and planetary gear units.
Except for the solenoid valves, the hydraulic control system of the electronically controlled transmission
is basically the same as that of the fully hydraulic controlled automatic transmission.
HYDRAULIC CONTROL SYSTEM
VALVE BODY
OIL PUMP
ECMSOLENOID VALVES
CLUTCHES & BRAKES
Hydr. pressure control
Fluid passage switchingPlanetary gear sets
Torque Converter Clutch
w 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
output required from 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 problems are
noted, the line pressure should be measured to see if it is within standard.
w 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, accordingly, line pressure is regulated in re-
sponse to the throttle valve opening.
In the fully hydraulic controlled automatic transmission, throttle pressure is used for regulating line pressure
and as signal pressure for up±shift and down±shift of the transmission. In the electronically controlled
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. AT1±6
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATION

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