TOYOTA SUPRA 1995 Service Repair Manual

A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONOPERATION -
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OPERATION
1. OPERATING CONDITIONSAT0PT-03

A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONOPERATION -
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2. COMPONENTS FUNCTION

A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONOPERATION -
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3. HYDRAULIC CONTROL SYSTEM
The hydraulic control system is composed of the oil pump, the valve body, the solenoid valves, the accu-
mulators, 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 hy-
draulic pressure acting on the torque converter clutch, clutches and brakes in accordance with the ve-
hicle driving conditions.
There are 5 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
pressure.

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4. 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 sen-
sors located throughout the vehicle and in response to the engine's running condition.
In addition, the ECM control reduces vehicle squat when the shift lever is moved from N to D.
The electronic control system is also equipped with a self diagnosis system which diagnoses malfunc-
tions 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 actua-
tors.

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COMPONENT PARTS REMOVAL
COMPONENTS
AT0DB-02

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TRANSMISSION DISASSEMBLY
1. REMOVE CONTROL SHAFT LEVER
2. REMOVE PARK/NEUTRAL POSITION SWITCH
(a) Unstake the lock washer.
(b) Remove the nut and bolt.
(c) Remove the park/neutral position switch.
3. REMOVE OIL TEMPERATURE SENSOR
(a) Remove the oil temperature sensor.
(b) Remove the O-ring from the sensor.
4. REMOVE UNIONS
(a) Remove the 2 unions.
(b) Remove the O-ring from both unions.
AT0DC-05

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5. REMOVE NO.1 VEHICLE SPEED SENSOR
(a) Remove the No.1 vehicle speed sensor.
(b) Remove the O-ring from the sensor.
6. REMOVE NO.2 VEHICLE SPEED SENSOR
(a) Remove the No.2 vehicle speed sensor.
(b) Remove the O-ring from the sensor.
7. REMOVE O/D DIRECT CLUTCH SPEED SENSOR
(a) Remove the O/D direct clutch speed sensor.
(b) Remove the O-ring from the sensor.
8. REMOVE TRANSMISSION HOUSING
(a) Remove the 6 bolts.
(b) Remove the transmission housing.
9. REMOVE TRANSMISSION OUTPUT FLANGE
(a) Using a hammer and a chisel, loosen the staked part of
the nut.
HINT: Shift the manual valve lever to the P position.