sensor TOYOTA SUPRA 1995 Service Workshop Manual

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS REMOVAL -
AT-22
TRANSMISSION DISASSEMBLY
1. SUPRA, PREVIA:
REMOVE WIRE HARNESS CLAMP AND THROTTLE
CABLE CLAMP
2. REMOVE TRANSMISSION CONTROL SHAFT LEVER
3. REMOVE PARK/NEUTRAL POSITION SWITCH
(a) Unstake the lock washer.
(b) Remove the nut and bolt, and then remove the park/neu-
tral position switch.
(c) Remove the lock washer and grommet.
4. SUPRA, T100:
REMOVE A/T OIL TEMPERATURE SENSOR
(a) Remove the oil temperature sensor.
(b) Remove the O-ring from the sensor.
5. REMOVE UNIONS
(a) Remove the 2 unions.
(b) Remove the O-rings from both unions.
AT0SG-01

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS REMOVAL -
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6. REMOVE NO.1 VEHICLE SPEED SENSOR
(a) Remove the No.1 vehicle speed sensor.
(b) Remove the O-ring from it.
7. REMOVE NO.2 VEHICLE SPEED SENSOR
(a) Remove the No.2 vehicle speed sensor.
(b) Remove the O-ring from it.
8. REMOVE TRANSMISSION HOUSING
(a) Remove the 6 bolts.
(b) Remove the transmission housing.
9. INSTALL TRANSMISSION CASE
Install the transmission case on the overhaul attachment.
10. REMOVE EXTENSION HOUSING
(a) Remove the 6 bolts.
(b) Remove the extension housing.

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS REMOVAL -
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(c) Remove the oil apply tube and gasket from the extension
housing.
11. SUPRA:
REMOVE SPEEDOMETER DRIVE GEAR AND BALL
(a) Using snap ring pliers, remove the snap ring.
(b) Remove the speedometer drive gear and ball.
12. SUPRA:
REMOVE SENSOR ROTOR AND KEY
(a) Remove the sensor rotor and key.
(b) Using snap ring pliers, remove the snap ring.
13. OTHERS:
REMOVE SPEEDOMETER DRIVE GEAR AND BALL
(a) Using snap ring pliers, remove the snap ring.
(b) Remove the speedometer drive gear and ball.
14. OTHERS:
REMOVE SENSOR ROTOR AND KEY
(a) Remove the sensor rotor and key.
(b) Using snap ring pliers, remove the snap ring.

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS INSTALLATION -
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36. INSTALL OIL PAN
(a) Remove any packing material and be careful not to drop
oil on the contacting surfaces of the transmission case
and oil pan.
(b) Apply seal packing to the oil pan.
Seal packing:
Part No. 08826-00090, THREE BOND 1281 or equiva-
lent
(c) Install and torque the 19 bolts.
Torque: 7.4 N´m (75 kgf´cm, 65 in.´lbf)
37. INSTALL SENSOR ROTOR AND KEY
SUPRA:
OTHERS:
(a) Using snap ring pliers, install the snap ring.
(b) Install the key on the output shaft.
(c) Align the groove of the sensor rotor with the key, install the
sensor rotor.

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS INSTALLATION -
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(c) Apply seal packing or equivalent to the 6 bolts.
Seal packing:
Part No. 08826-00070, THREE BOND 1324 or equiva-
lent
(d) Install the extension housing with a new gasket to the
case. install and torque the 6 bolts.
HINT: The 2 lower bolts are shorter.
Torque: 36 N´m (370 kgf´cm, 27 ft´lbf)
40. INSTALL TRANSMISSION HOUSING
(a) Clean the threads of the bolts and case with white gaso-
line.
(b) Apply seal packing or equivalent to the six bolts.
Seal packing:
Part No. 08826-00070, THREE BOND 1324 or equiva-
lent
(c) Install and torque the 6 bolts.
Torque:
10 mm bolt 34 N´m (345 kgf´cm, 25 ft´lbf)
12 mm bolt 57 N´m (580 kgf´cm, 42 ft´lbf)
41. INSTALL NO.2 VEHICLE SPEED SENSOR
(a) Install the O-ring from the sensor.
(b) Install the No.2 vehicle speed sensor.
42. INSTALL NO.1 VEHICLE SPEED SENSOR
(a) Install the O-ring from the sensor.
(b) Install the No.1 vehicle speed sensor.

A340E(Others) AUTOMATIC TRANSMISSIONCOMPONENT PARTS INSTALLATION -
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43. INSTALL UNION AND ELBOW
(a) Coat the new O-rings with ATF and install them to union
and elbow.
(b) Install the front union.
Torque: 29 N´m (300 kgf´cm, 22 ft´lbf)
(c) Install the rear union.
Torque: 29 N´m (300 kgf´cm, 22 ft´lbf)
44. SUPRA, T100
INSTALL A/T OIL TEMPERATURE SENSOR
(a) Coat new O-ring with ATF and install it to the oil tempera-
ture sensor.
(b) Install the sensor.
Torque: 29 N´m (300 kgf´cm, 22 ft´lbf)
45. INSTALL PARK/NEUTRAL POSITION SWITCH
(a) Install the park/neutral position switch onto the manual
valve lever shaft and temporarily tighten the adjusting
bolt.
(b) Install the grommet and a new lock washer. Install and
torque the nut.
Torque: 6.9 N´m (70 kgf´cm, 61 in.´lbf)
(c) Using the control shaft lever, fully turn the manual lever
shaft back and return 2 notches. It is now in neutral.
(d) Align the neutral basic line and the switch groove, and
tighten the adjusting bolt.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
(e) Bend the tabs of the lock washer.
HINT: Bend at least 2 of the lock washer tabs.

ELECTRONIC CONTROL SYSTEM
The electronic control system, which controls the shift points and the operation of the lock±up clutch, is
composed of the following three parts:
1. Sensors
These sensors sense the vehicle speed, throttle opening and other conditions and send this data to the
ECM in the form of electrical signals.
2. ECM
The ECM determines the shift and lock±up timing based upon the signals from sensors, and controls the
solenoid valves of the hydraulic control unit accordingly.
3. Actuators
These are three solenoid valves that control hydraulic pressure acting on the hydraulic valves to control
shifting and lock±up timing.
SENSORSECM
DRIVING PATTERN
SELECTOR
PARK/NEUTRAL
POSITIOIN SWITCH
THROTTLE POSITIOIN
SENSOR
VEHICLE SPEED
SENSOR
STOP LIGHT SWITCH
O/D MAIN SWITCH
CRUISE CONTROL
ECU
ENGINE COOLANT TEM-
PERATURE SENSOR
A/T FLUID
TEMPERATURE SENSOR
Back±up system
Self±diagnostic
system
Control of lock±
up timing
Control of shift
timing
ACTUATORS
NO. 1
SOLENOID VALVE
NO. 2
SOLENOID VALVE
LOCK±UP
SOLENOID VALVE
O/D OFF INDICA-
TOR LIGHT
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATIONAT1±7

FUNCTION OF ECU
w Control of Shifting Timing
The ECM has programmed into its memory the optimum shift pattern for each shift lever position (D, 2, L
position) and driving mode (Normal or Manual).
Based on the appropriate shift pattern, the ECM turns No.1 and No.2 solenoid valves on or off in accor-
dance with the vehicle speed signal from the vehicle speed sensor and the throttle opening signal from the
throttle position sensor. In this manner, the ECM operates each shift valve, opening or closing the fluid pas-
sages to the clutches and brakes to permit up±shift or down±shift of the transmission.
HINT: The electronic control system provides shift timing and lock±up control only while the vehicle is travel-
ing forward. In REVERSE, PARK, and NEUTRAL, the transmission is mechanically, not electronically con-
trolled.
w Control of Overdrive
Driving in overdrive is possible if the O/D main switch is on and the shift lever is in the D position. However,
when the vehicle is being driven using the cruise control system (CCS), if the actual vehicle speed drops
to about 4 km/h (2 mph) below the set speed while the vehicle is running in overdrive, the CCS ECU sends
a signal to the ECM to release the overdrive and prevent the transmission from shifting back into overdrive
until the actual vehicle speed reaches the speed set in the CCS memory.
On this model, if the engine coolant temperature falls below 60°C (140°F), the ECM sends a signal to the
ECM, preventing the transmission from up±shifting into overdrive.
w Control of Lock±Up System
The ECM has programmed in its memory a lock±up clutch operation pattern for each driving mode (Normal
of Manual). Based on this lock±up pattern, the ECM turns lock±up solenoid valve on or off in accordance
with the vehicle speed signals received from the vehicle speed sensor and the throttle opening signals from
the throttle position sensor.
Depending on whether lock±up solenoid valve is on or off, the lock±up relay valve performs changeover
of the fluid passages for the converter pressure acting on the torque converter clutch to engage or disen-
gage the lock±up clutch.
Mandatory Cancellation of Lock±Up System:
If any of the following conditions exist, the ECM turns off lock±up solenoid valve to disengage the lock±up
clutch.
1) The brake light switch comes on (during braking).
2) The IDL points of the throttle position sensor close (throttle valve fully closed).
3) The vehicle speed drops 4 km/h (2 mph) or more below the set speed while the cruise control system
is operating.
4) The engine coolant temperature falls below 60°C (140°F) and vehicle speed is under 60 km/h (37
mph), or 35°C (95°F) and vehicle speed is under 40 km/h (25 mph).
The purpose of 1) and 2) above is to prevent the engine from stalling if the rear wheels lock up.
The purpose of 3) is to cause the torque converter clutch to operate to obtain torque multiplication. The
purpose of 4) is both to improve general driveability, and to speed up transmission warm±up.
Also, while the lock±up system is in operation, the ECM will temporarily turn it off during up±shift or down±
shift in order to decrease shifting shock. AT1±8
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATION

ARRANGEMENT OF COMPONENTS
 No. Components Function
 
1Pattern Select Switch Selects the Manual mode or the Normal mode for shift 1 Pattern Select Switch Selects the Manual mode or the Normal mode for shift
and lock±up timing. 
2Crankshaft Position SensorDetects the engine speed 2 Crankshaft Position Sensor Detects the engine speed.
 3Park/Neutral Position SwitchDetects the shift lever position

3 Park/Neutral Position Switch Detects the shift lever position.
 
4Stop Light SwitchDetects if the brake pedal is depressed 4 Stop Light Switch Detects if the brake pedal is depressed.
5Throttle Position SensorDetects the throttle valve opening angle 5 Throttle Position Sensor Detects the throttle valve opening angle.
 
6O/D Main Switch Prevents up±shift to the O/D gear if the O/D main 6 O/D Main Switch Prevents u shift to the O/D gear if the O/D main
switch is off.
 
 7Cruise Control ECU
This ECU prevents the transmission from shifting into
O/D and prohibits lock up control when the vehicle's 7 Cruise Control ECU O/D and prohibits lock±up control when the vehicle's
speed drops below the cruise control set speed parameter.
AT1±10± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATION

 
 
 
8
 
 
 
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.
 9Engine Coolant Temp SensorDetects the engine coolant temp 9Engine Coolant Temp. SensorDetects the engine coolant temp.
 
10ECMControls the engine and transmission actuators based on 10ECMControls the engine and transmission actuators based on
signals from each sensor. 
 11No 1 and No 2 Solenoid ValvesControl the hydraulic pressure applied to each shift valve,
 11No.1 and No.2 Solenoid ValvesControl the hydraulic ressure a lied to each shift valve,
and control the gear position and timing.
 
12
Lock±up Solenoid Valve
(For lock up control pressure modulaControls the hydraulic pressure applied to the lock±up 
 
12(For lock±up control pressure modula-
tion)Controls the hydraulic ressure a lied to the lock u
clutch and controls lock±up timing.
 
13O/D OFF Indicator Light
Blinks and warns the driver, while the O/D main switch is
pushed in when the electronic control circuit is malfunction 
 
13O/D OFF Indicator Lightpushed in, when the electronic control circuit is malfunction-
ing.
 
14Kick down SwitchDetects if the accelerator pedal is depressed beyond the 14Kick±down SwitchDetects if the accelerator edal is de ressed beyond the
full throttle valve opening position.
 
15A/T Fluid Temp SensorDetects the A/T fluid temp 15A/T Fluid Temp. SensorDetects the A/T fluid temp.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONOPERATIONAT1±11