1995 TOYOTA SUPRA clutch

See
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock±up condition, when brakes
are suddenly applied.
When the brake pedal is operated, this switch sends a signal to ECM. Then the ECM cancels operation of the
lock±up clutch while braking is in progress.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check operation of stop light.
Check and repair stop light circuit.
Check if the stop lights go on and off normally when the brake pedal is depressed and
released.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±83

Pattern Select Switch Circuit
CIRCUIT DESCRIPTION
The ECM memory contains the shift programs for the NORMAL and MANUAL patterns, 2 position, and L posi-
tion and the lock±up patterns. Following the programs corresponding to the signals from the pattern select
switch, the park/neutral position switch and other various sensors the ECM switches the solenoid valves ON
and OFF, thereby controlling the transmission gear change and the lock±up clutch operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
Check A/T fluid temp. sensor. (See page AT1±64).
Replace A/T fluid temp. sensor.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±85

SERVICE SPECIFICATIONS
SERVICE DATA
 Line pressure (wheel locked) Engine idling   
 D position 363±422 kPa 3.7±4.3 kgf/cm2 53±61 psi
 R position 500±598 kPa 5.1±6.1 kgf/cm2 73±88 psi
 AT stall (Throttle valve fully opened) 
 D position 902±1,147 kPa 9.2±11.7 kgf/cm2 131±166 psi
 R position 1,236±1,589 kPa 12.6±16.2 kgf/cm2 179±230 psi
 Engine stall revolution (D and R position) 2,200+150 rpm
 
 
Time lag N " D position
N " R position 
 
Less than 1.2 seconds
Less than 1.5 seconds
 
 
Engine idle speed
(In N position and air conditioner OFF) 
 
700+50 rpm 
 
 Throttle cable adjustment Between boot and face and inner cable stopper
 (Throttle valve fully closed) 0±1 mm 0±0.04 in.
 Drive plate runout Max 0.20 mm 0.0079 in.
 Torque converter clutch runout Max 0.30 mm 0.0118 in.
SHIFT POINT
NORM Mode
 Shift Position Shifting Point Vehicle speed km/h (mph)
 
 
 
 
 
 
 
D
Throttle valve fully opened 1"2
2"3
3"O/D
O/D"3
3"2
2"1
Throttle valve fully closed 3"O/D
O/D"353±62 (33±39)
104±112 (65±70)
163±175 (101±109)
157±169 (98±105)
98±105 (61±65)
42±48 (26±30)
34±39 (21±24)
20±25 (12±16)
 
 
 
2
Throttle valve fully opened 1"2
* 3"2
2"153±62 (33±39)
121±132 (75±82)
42±48 (26±330)
 LThrottle valve fully opened * 2"148±53 (30±33)
MANU Mode
 Shift Position Shifting Point Vehicle speed km/h (mph)
 
 
 
 
 
D
Throttle valve fully opened 2"3
3"O/D
O/D"3
3"2
Throttle valve fully closed 3"O/D
O/D"3104±112 (65±70)
163±175 (101±109)
157±169 (98±109)
98±105 (61±65)
163±175 (101±109)
20±25 (12±16)
 2Throttle valve fully opened * 3"2121±132 (75±82) 
 LThrottle valve fully opened * 2"148±53 (30±33)
AT1±96± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS

TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
 Engine block X Transmission 14 mm 37 380 27 
 17 mm
 
 72
 
 730
 
 53
 Rear mounting X Body 25 260 19
 Extension housing X Transmission case 36 370 27
 Valve body X Transmission case 10 100 7 
 Oil strainer
 
 10
 
 100
 
 7
 Oil pan 7.4 75 65 in.Vlbf
 No.1 vehicle speed sensor 16 160 12
 No.2 vehicle speed sensor 5.4 55 48 in.Vlbf 
 Solenoid wiring stopper plate
 
 5.4
 
 55
 
 48 in.Vlbf
 Rear center floor crossmember brace X Body 13 130 9
 Propeller shaft X Differential 79 805 58
 Manual shift linkage X Control shaft lever 13 130 9 Center support bearing X Body 49 500 36 
 Throttle cable X Transmission case
 
 5.4
 
 55
 
 48 in.Vlbf
 Cooler pipe union nut 34 350 25
 Drive plate X Crankshaft 74 750 54
 Torque converter clutch X Drive plate 33 340 25 
 Control shaft lever X Park/Neutral position switch
 
 16
 
 160
 
 12
 A/T fluid temp. sensor 15 150 11
 Drain plug 20 205 15
 Solenoid valve X Valve body 10 100 7 
 Parking lock pawl bracket
 
 7.4
 
 75
 
 65 in.Vlbf
 Transmission mounting bracket X Extension housing 25 250 18
 Heat insulator X Body 5.4 55 48 in.Vlbf
 Starter 37 380 27
AT1±98± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS

ComponentFunction
O/D Direct Clutch (Co)
O/D Brake (Bo)
O/D One±Way Clutch (Fo)
Forward Clutch (C1)
Direct Clutch (C2)
2nd Coast Brake (B1)
2nd Brake (B2)
1st & Reverse Brake (B3)
No.1 One±Way clutch (F1)
No.2 One±Way Clutch (F2)
Connect overdrive sun gear and overdrive carrier
Prevents overdrive sun gear from turning either clockwise or counterclockwise
When transmission is being driven by engine, connects overdrive sun gear
and overdrive carrier
Connects input shaft and front planetary ring gear
Connects input shaft and front & rear planetary sun gear
Prevents front & rear planetary sun gear from turning either clock-
wise or counterclockwise
Prevents outer race of F1 from turning either clockwise or counterclockwise,
thus preventing front & rear planetary sun gear from turning counterclockwise
When B2 is operating, prevents front & rear planetary sun gear from turning
counterclockwise
Prevents rear planetary carrier from turning counterclockwise
Prevents rear planetary carrier from turning either clockwise or counterclockwise
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATIONAT2±3

HYDRAULIC CONTROL SYSTEM
The hydraulic control system is composed of an oil pump, valve body, solenoid valves, accumulators,
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 five 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 control the shift valves,
and change the gear shift position.
The No.3 solenoid valve is operated by signals from the ECM to engage or disengage the lock±up clutch
of the torque converter clutch.
The No.4 solenoid valve is operated by signals from the ECM to control the engagement speed and reduce
gear shift shock.
The No.5 solenoid valve is operated by signals from the ECM to regulate the line pressure to throttle pres-
sure.
HYDRAULIC CONTROL SYSTEM
VALVE BODY
OIL PUMP
ECMSOLENOID VALVES
CLUTCHES & BRAKES
Hydr. pressure control
Fluid passage switchingPlanetary gear sets
Torque Converter Clutch
AT2±6± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATION

ELECTRONIC CONTROL SYSTEM
The electronic control system for the A340E automatic transmission provides extremely precise control of
the gear shift timing and lock±up timing in response to driving conditions as sensed by various sensors
located throughout the vehicle and in response to the engine's running condition.
At the same time, the ECM control reduces vehicle squat when the vehicle starts out and gear shift shock.
The electronic control system is also equipped with a self diagnosis system which diagnoses malfunctions
for the vehicle to continue functioning when a malfunction occurs.
CONSTRUCTION
The electronic control system can be broadly divided onto three groups; the sensors, ECM and actuators.
No. 1 Vehicle Speed Sensor
No. 2 Vehicle Speed Sensor
Crankshaft Position Sensor
Camshaft Position Sensor No.1, No.2
Park/Neutral Position Switch

Neutral Start Signal

Shift lever Position Signal

Idling Signal

Throttle Position Signal
Main (Sub) Ð throttle Position Sensor
Engine Coolant temp. Sensor
A/T Fluid Temp. Sensor
O/D Main Switch
Cruise Control ECU
Kick±Down Switch
Stop Light Switch
Pattern Select Switch
SENSORSECMACTUATORS
No.1 Solenoid Valve
No.2 Solenoid Valve
No.3 Solenoid Valve
No.4 Solenoid Valve
No.5 Solenoid Valve
Engine Torque Control (ESA)
Igniters
Ignition Coils
Distributors
Spark Plugs
O/D OFF Indicator Light
(Diagnostic Trouble Code
Display)
TRAC ECU
O/D Direct Clutch Speed Sensor
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATIONAT2±7

 O/D Direct Clutch Speed Sensor Detects the input shaft speed from 1st gear to 3rd gear
 Engine Coolant Temp. Sensor Detects the engine coolant temp.
 
 ECM 
 
Controls the engine and transmission actuators based on signals from
each sensor.
 
 No.1 and No.2 Solenoid Valves 
 
Control the hydraulic pressure applied to each shift valve, and control the
gear position and timing.
 
 
 
No.4 Solenoid Valve
(For accumulator back pressure modulation) 
 
 
Controls the hydraulic pressure applied to the back chamber of the accu-
mulator and smoothes the engagement of clutches and brakes during
shifting.
 
 
No.3 Solenoid Valve
(For lock±up control pressure modulation) 
 
Controls the hydraulic pressure applied to the lock±up clutch and controls
lock±up timing.
 
 
No.5 Solenoid Valve
(For line pressure modulation) 
 Controls the line pressure.
 
 O/D OFF Indicator Light 
 
Blinks and warns the driver, while the O/D main switch is pushed in,
when the electronic control circuit is malfunctioning.
 A/T Fluid Temp. Sensor Detects A/T fluid temp.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATIONAT2±11