TOYOTA SUPRA 1995 Service Repair Manual

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

SYSTEM DIAGRAM
AT2±8± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATION

± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATIONAT2±9

ARRANGEMENT OF COMPONENTS
ComponentsFunction 
 Pattern Select Switch
 
 Selects the Power mode or the Normal mode for shift and
lock±up timing.
 
 Crankshaft Position Sensor and Camshaft Position
Sensor 
 Detects the engine speed.
 Park/Neutral Position Switch Detects the shift lever position.
 Stop Light Switch Detects if the brake pedal is depressed.
 Throttle Position Sensor Detects the throttle valve opening angle.
 O/D Main Switch Prevents up±shift to the O/D gear if the O/D switch is off.
 
 
 
Cruise Control ECU
 
 
 
This ECU prevents the transmission from shifting into O/D
and prohibits lock±up control when the vehicle's speed
drops below the cruise control set speed parameter.
 
 No.1 and No.2 Vehicle Speed Sensor.
 
 
Detects the vehicle speed. Ordinarily, transmission control
uses signals from the No.2 vehicle speed sensor, and the
No.1 vehicle speed sensor is used as a back±up.
AT2±10± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATION

 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

09032±00100 Oil Pan Seal Cutter
09308±00010 Oil Seal Puller
09309±37010 Transmission Bearing Replacer
09350±30020 TOYOTA Automatic Transmission
Tool Set
(09351±32010) One±way Clutch Test Tool
(09351±32020) Stator Stopper
09517±36010 Rear Axle Shaft Oil Seal
Replacer
09990±01000 Engine Control Computer Check
Harness ªAº
09843±18020 Diagnosis Check Wire
PRECAUTION
PRECAUTIONS
When working with FIPG material, you must observe the following.
wUsing a razor blade and gasket scraper, remove all the old packing (FIPG) material from the gasket
surfaces.
wThoroughly clean all components to remove all the loose material.
wClean both sealing surfaces with a non±residue solvent.
wApply the FIPG in an approx. 1 mm (0.04 in.) wide bead along the sealing surface.
wParts must be assembled within 10 minutes of application. Otherwise, the FIPG material must be
removed and reapplied.
If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section.
PREPARATION
SST (SPECIAL SERVICE TOOLS)
AT2±12± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONPRECAUTION

09992±00094 Automatic Transmission Oil
Pressure Gauge Set
09082±00050 TOYOTA Electrical Toaster Set
RECOMMENDED TOOLS
EQUIPMENT
 Straight edge Check torque converter clutch
installation.
 
Vernier calipersCheck torque converter clutch Vernier cali ersCheck torque converter clutch
installation. 
 Dial indicator or dial indicator with magnetic baseMeasure drive plate runout
 
 
Torque wrench
LUBRICANT
 Item Capacity Classification
 Automatic transmission fluid
Dry fill8 2 liters (8 7 US qts 7 2 lmpqts)ATF TYPE T II or Equivalent 
 
Dry fill
Drain and refill
8.2 liters (8.7 US qts, 7.2 lmp. qts)
1.9 liters (2.0 US qts, 1.6 lmp. qts)
ATF TYPE T±II or Equivalent
SSM (Special Service Materials)
 
 
 
08826±00090 Seal Packing 128
THREE BOND 1281 or equivalent
(FIPG) 
 
 
Oil pan
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONPREPARATIONAT2±13

ON±VEHICLE REPAIR
EXTENSION HOUSING REAR OIL SEAL
REPLACEMENT
1. DRAIN A/T FLUID
2. REMOVE FRONT EXHAUST PIPE AND HEAT INSULATOR
(See page AT2±22)
3. REMOVE PROPELLER SHAFT (See page PR±7)
4. REMOVE TRANSMISSION OUTPUT FLANGE
(a) Using a hammer and chisel, loosen the staked part of the nut.
HINT: Shift the shift lever to the P position.
(b) Remove the nut.
(c) Tap the output flange with a plastic hammer to remove it and
2 washers.
(d) Using a screwdriver, remove the oil seal from the output
flange.
5. REMOVE EXTENSION HOUSING REAR OIL SEAL
Using SST, remove the oil seal.
SST 09308±00010
6. INSTALL EXTENSION HOUSING REAR OIL SEAL
(a) Coat the lip of a new oil seal with MP grease.
(b) Using SST and a hammer, drive in the oil seal with the lip
facing downward.
SST 09309±37010
Oil seal depth from flat end:
0±0.3 mm (0±0.012 in.)
7. INSTALL TRANSMISSION OUTPUT FLANGE
(a) Using SST and a hammer, drive in a new oil seal.
SST 09517±36010 AT2±14
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONON±VEHICLE REPAIR

(b) Install the output flange and 2 washers.
(c) Install and torque a new nut.
Torque: 123 NVm (1.250 kgfVcm, 90 ftVlbf)
HINT: Shift the shift lever to the P position
(d) Using a hammer and chisel, stake the nut.
8. INSTALL PROPELLER SHAFT
(See page PR±13)
9. INSTALL FRONT EXHAUST PIPE AND HEAT INSULATOR
(See page AT2±22)
10. FILL AND CHECK A/T FLUID (See page AT2±42)
A/T FLUID TEMP. SENSOR
REPLACEMENT
1. DISCONNECT A/T FLUID TEMP. SENSOR CONNECTOR
2. REMOVE A/T FLUID TEMP. SENSOR
(a) Remove the A/T fluid temp. sensor.
(b) Remove the O±ring from it.
3. INSTALL A/T FLUID TEMP. SENSOR
(a) Coat a new O±ring with A/T fluid and install it to the A/T fluid
temp. sensor
(b) Install the A/T fluid temp. sensor.
Torque: 15 NVm (150 kgfVcm, 11 ftVlbf)
4. CONNECT A/T FLUID TEMP. SENSOR CONNECTOR
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONON±VEHICLE REPAIRAT2±15

NO.1 VEHICLE SPEED SENSOR ASSEMBLY
REPLACEMENT
1. DISCONNECT NO.1 VEHICLE SPEED SENSOR
CONNECTOR
2. REMOVE NO.1 VEHICLE SPEED SENSOR ASSEMBLY
(a) Remove the bolt and No.1 vehicle speed sensor assembly.
(b) Remove the speedometer driven gear from the No.1 speed
sensor.
(c) Remove the O±ring from the No.1 vehicle speed sensor.
3. INSTALL NO.1 VEHICLE SPEED SENSOR ASSEMBLY
(a) Coat a new O±ring with A/T fluid and install it to the No.1
vehicle speed sensor.
(b) Install the speedometer driven gear to the No.1 vehicle
speed sensor.
(c) Install the No.1 vehicle speed sensor to the extension
housing and torque the bolt.
Torque: 16 NVm (160 kgfVcm, 12 ftVlbf)
4. CONNECT NO.1 VEHICLE SPEED SENSOR
CONNECTOR
NO.2 VEHICLE SPEED SENSOR
REPLACEMENT
1. DISCONNECT NO.2 VEHICLE SPEED SENSOR
CONNECTOR
2. REMOVE NO.2 VEHICLE SPEED SENSOR
(a) Remove the bolt and No.2 vehicle speed sensor.
(b) Remove the O±ring.
3. INSTALL NO.2 VEHICLE SPEED SENSOR
(a) Coat a new O±ring with A/T fluid and install it to the No.2
vehicle speed sensor.
(b) Install the No.2 vehicle speed sensor to the extension
housing and torque the bolt.
Torque: 5.4 NVm (55 kgfVcm, 48 in.Vlbf)
4. CONNECT NO.2 VEHICLE SPEED SENSOR
CONNECTOR AT2±16
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONON±VEHICLE REPAIR