1995 TOYOTA SUPRA brake light

A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340E (2JZ-GTE) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-24
First and Reverse Brake
Pack clearance0.70 - 1.00 mm 0.0276 - 0.0394 in.
Piston returm spring free length12.9 mm 0.508 in.
Flange thickness No. 68
No. 67
No. 50
No. 51
No. 52
No. 53
No. 54
No. 555.4 mm 0.213 in.
5.2 mm 0.205 in.
5.0 mm 0.197 in.
4.8 mm 0.189 in.
4.6 mm 0.181 in.
4.4 mm 0.173 in.
4.2 mm 0.165 in.
4.0 mm 0.157 in.
Transmission Case
Transmission case bushing inside diameterMaximum38.18 mm 1.5031 in.
Output Shaft
Output shaft thrust play1.63 - 2.89 mm 0.0642 - 0.1138 in.
Valve Body Spring
SpringFree length / Outer diameter
mm (in.)Total No. of coils & (Color)
Upper valve body
Lock - up relay valve23.42 (0.9220) / 5.86 (0.2307)12.25 (Red)
Secondary regulator valve32.79 (1.2909) / 9.40 (0.3700)12.75 (Blue)
C1Orifice control valve37.13 (1.4618) / 11.14 (0.4316)11.25 (White)
C1Orifice control valve21.50 (0.8465) / 7.76 (0.3055)11.50 (None)
C1Accumulator75.26 (2.9623) / 15.02 (0.5193)17.06 (Pink)
2-3 Shift valve30.77 (1.2114) / 9.70 (0.3819)10.50 (Purple)
3-4 Shift valve30.77 (1.2114) / 9.70 (0.3819)10.50 (Purple)
Reverse control valve25.58 (1.0070) / 8.64 (0.3402)8.75 (None)
Lower valve body
Primary regulator valve45.62 (1.7961) / 16.88 (0.6446)9.5 (Blue)
Lock-up control valve18.52 (0.7291) / 5.30 (0.209)12.75 (White)
Cut back valve18.80 (0.740) / 7.48 (0.2995)7.50 (None)
Solenoid relay valve18.80 (0.740) / 7.48 (0.2995)7.50 (None)
Solenoid modulator valve32.13 (1.2650) / 8.00 (0.3150)15.75 (Yellow)
Cut off valve20.30 (0.799) / 6.10 (0.240)12.75 (None)
Accumulator control valve31.17 (1.2272) / 8.85 (0.3484)12.50 (White)
1-2 Shift valve30.77 (1.2114) / 9.70 (0.382)10.50 (Purple)
Coast modulator valve21.83 (0.8594) / 8.19 (0.3150)10.5 (Green)
Coast modulator valve26.11 (1.027) / 8.19 (0.3224)
26.60 (1.043) / 8.19 (0.3224)
27.11 (1.067) / 8.19 (0.3224)12.0 (Blue)
12.0(Light Blue)
12.0 (White)

A340E(Others) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340E(Others) AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-29
First and Reverse Brake
Pack clearance0.60 - 1.12 mm 0.0236 -0.0441 in.
Flange thickness No.50
No.51
No.52
No.53
No.54
No.555.0 mm 0.197 in.
4.8 mm 0.189 in.
4.6 mm 0.181 in.
4.4 mm 0.173 in.
4.2 mm 0.165 in.
4.0 mm 0.157 in.
Rear Planetary Gear
Planetary pinion gear thrust clearance Standard
Maximum0.20 - 0.60 mm 0.0079 - 0.0236 in.
1.00 mm 0.0394 in.
Valve Body Spring
SpringFree length and Coil outer
diameter mm (in.)Total No. of coils and Color
Upper valve body
Secondary regulator valve30.9 (1.217) 11.2 (0.441)10.5 Blue
Lock-up relay valve21.4 (0.843) 5.5 (0.217)17.5 Light Gray
3 - 4 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Down shift plug27.3 (1.075) 8.7 (0.343)12.5 Yellow
Throttle valve20.6 (0.811) 9.2 (0.362)
or 23.3 (0.917) 9.2 (0.362)9.5 Blue
9.5 White
SUPRA, PREVIA
Second coast modulator valve24.6 (0.967) 8.3 (0.327)9.0 Orange
OTHERS
Second coast modulator valve25.3 (0.996) 8.6 (0.339)9.5 Orange
Cut-back valve21.8 (0.858) 6.0 (0.236)13.5 Red
2 - 3 shift valve30.8 (1.213) 9.7 (0.382)10.5 Blue
SUPRA, PREVIA
Low coast modulator valve26.4 (1.039) 8.3 (0.327)10.5 Yellow
OTHERS
Low coast modulator valve30.4 (1.197) 8.3 (0.327)10.5 Yellow
Lower valve body
Check valve20.2 (0.796) 12.1 (0.476)6.5 None
Pressure relief valve11.2 (0.441) 6.4 (0.252)7.5 None
1 - 2 shift valve30.8 (1.213) 9.7 (0.382)10.5 Purple
Primary regulator valve62.3 (2.453) 18.6 (0.732)12.5 Purple
SUPRA
Accumulator control valve36.1 (1.421) 8.9 (0.327)14.0 White
OTHERS
Accumulator control valve33.9 (1.335) 8.8 (0.346)12.0 Pink

A340H AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS - A340H AUTOMATIC TRANSMISSIONSERVICE SPECIFICATIONS -
AT-36
Transfer Direct Clutch
Piston stroke2.28 - 2.68 mm 0.0898 - 0.1055 in.
Drum bushing inside diameter47.65 mm 1.8760 in.
Flange thickness3.9 mm 0.154 in.
4.1 mm 0.161 in.
4.3 mm 0.169 in.
4.5 mm 0.177 in.
Transfer Low Speed Brake
Center support bushing inside diameter35.08 mm 1.3811 in.
Ring gear flange bushing inside diameter35.08 mm 1.3811 in.
Planetary gear bushing inside diameter18.08 mm 0.7118 in.
Planetary pinion gear thrust clearance STD
Maximum0.30 - 0.60 mm 0.0118 - 0.0236 in.
1.00 mm 0.0394 in.
Transfer Front Drive Clutch
Piston stroke2.38 - 3.22 mm 0.0937 - 0.1268 in.
Transfer Valve Body Spring
SpringFree length and Coil outer
diameter mm (in.)Total No. of coils and Color
Upper valve body
Direct clutch accumulator valve55.7 (2.193) 18.3 (0.720)11.1 Blue
Center valve body
Accumulator control valve29.3 (1.154) 8.2 (0.323)11.8 White
Low-high relay valve31.7 (1.248) 8.5 (0.335)11.2 Light Blue
Low shift valve29.2 (1.213) 8.2 (0.323)
Lower valve body
Low-high shift timing valve33.1 (1.303) 8.7 (0.343)15.0 Red
Low-high orifice control valve29.7 (1.196) 9.0 (0.354)12.3 Green
Transfer Valve Body Key
KeyHeight
mm (in.)Width
mm (in.)Thickness
mm (in.)
Upper valve body
Direct clutch accumulator valve9.5 (0.374)9.5 (0.374)3.2 (0.126)
Center valve body
Accumulator control valve21.2 (0.835)5.0 (0.197)3.2 (0.126)
Low-high relay valve8.5 (0.335)5.0 (0.197)3.2 (0.126)
Low shift valve9.5 (0.374)5.0 (0.197)3.2 (0.126)
Lower valve body
Low-high shift timing valve8.5 (0.335)5.0 (0.197)3.2 (0.126)
Low-high orifice control valve8.5 (0.335)5.0 (0.197)3.2 (0.126)

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

HOW TO PROCEED WITH TROUBLESHOOTING
Vehicle Brought to Workshop
Customer Problem Analysis
P. AT1±33
Check and Clear Diagnostic Trouble Codes (Precheck)
P. AT1±33 ~AT1±35
Problem Symptom Confirmation
P. AT1±37
Symptom Simulation
P. IN±24
Diagnostic Trouble Code Check
P. AT1±34 ~AT1±35
Preliminary Check
P. AT1±42
Diagnostic Trouble Code Check
P. AT1±52
Shift Position Signal Check
P. AT1±36
Mechanical System Tests
P. AT1±44
Manual Shifting Test
P. AT1±50
Items insideare titles of pages in this manual,
with the page number indicated in the bottom portion.
See the indicated pages for detailed explanations.
Step [2], [5], [12], [15]:
Diagnostic steps permitting the use of the TOYOTA hand±
held tester or TOYOTA brake±out box.
Matrix Chart of Problem Symptoms ± P. AT1±57
Chapter 1
(Electronic)Chapter 2
(On±Vehicle)Chapter 3
(OFF±Vehicle)
P. AT1±60P. AT1±58
Circuit
Inspection
Main Throttle Signal Check

Stop Light Signal Check

Kick±Down Signal Check
P. AT1±62
Parts Inspection
P. AT1±64 ~AT1±95
Identification of ProblemRepairConfirmation TestEnd
AT1±32± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

CHECK TERMINAL TT OUTPUT
VOLTAGE
When a voltmeter is connected to the DLC2, the following
items can be checked:
1. Throttle position sensor signal
2. Brake signal
3. Shift position signal
1. VOLTMETER CONNECTION
Connect the positive (+) probe of the voltmeter to terminal TT
and the negative (±) probe to terminal E1 of the DLC2.
HINT: If a voltmeter with small internal resistance is used, the
correct voltage will not be indicated, so use a voltmeter with
an internal resistance of at least 10 k
/V.
2. TURN IGNITION SWITCH TO ON (DO NOT START THE
ENGINE)
3. CHECK THROTTLE POSITION SENSOR SIGNAL
Check if the voltage changes from approx. 0 V to approx. 8
V when the accelerator pedal is gradually depressed from the
fully closed position.
4. CHECK BRAKE SIGNAL (LOCK±UP CUT SIGNAL)
(a) Open the throttle valve fully to apply approx. 8 V to terminal
TT.
(b) In this condition, check terminal TT voltage when the brake
pedal is depressed and released.
TT terminal voltage:
0 V (When brake pedal is depressed)
8 V (When brake pedal is released)
5. START ENGINE
6. CHECK SHIFT POSITION SIGNAL
(VEHICLE SPEED ABOVE 9 km/h, 6 mph)
Check up±shifting together with terminal TT voltage.
HINT: Check for light shocks from up±shifting and for
changes in the tachometer.
 
 Gear Position
 
 Terminal TT output voltage
1st Gear0V 1st Gear0 V
2nd Gear2V 2nd Gear2 V
 2nd Lock up3V2nd Lock±up3 V 
3rd Gear4V 3rd Gear4 V
3rd Lock up5V 3rd Lock±up5 V
O/D6V O/D6 V
 O/D Lock up7VO/D Lock±up7 V
If terminal TT output voltage check cannot be done, do the
check of TT terminal circuit on page AT1±95. AT1±36
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

PROBLEM SYMPTOM CONFIRMATION
Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms of
the trouble. If the problem is that the transmission does not up±shift, does not down±shift, or the shift point
is too high or too low, conduct the following road test to confirm the automatic shift schedule and simulate
the problem symptoms.
ROAD TEST
NOTICE: Do the test at normal A/T fluid operating temp.
50±80°C (122 ± 176°F).
1. D POSITION TEST (NORM PATTERN)
Shift into the D position and keep the accelerator pedal
constant at the full throttle valve opening position, and check
the following points:
(a) Check up±shift operation.
Check that 1±2, 2±3 and 3±O/D up±shift takes place, at the
shift point shown in the automatic shift schedule.
(See page AT1±96)
HINT:
(1) O/D Gear Up±shift Prohibition Control.
w Coolant temp. is 60°C (140°F) or less.
w If there is a 10 km/h (6 mph) difference between the set
cruise control speed and
wvehicle speed.
wO/D main switch is pushed ON.
w(During O/D OFF, indicator light lights up.)
(2) O/D Gear Lock±up Prohibition Control.
w Brake pedal is depressed.
w Coolant temp. is 60°C (140°F) or less.
(b) Check for shift shock and slip.
Check for shock and slip at the 1±2, 2±3 and 3±O/ D up±
shifts.
(c) Check for abnormal noise and vibration.
Run at the D position lock±up or O/D gear and check for ab-
normal noise and vibration.
HINT: The check for the cause of abnormal noise and vibra-
tion must be performed very thoroughly as it could also be
due to loss of balance in the torque converter clutch, etc.
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±37