1995 TOYOTA SUPRA stop start

Chapter 3. Off±Vehicle Repair
(: A340E, A340F, A340H AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM391U)
AT1±26
See Page
Suspect Area
Symptom
Vehicle does not move in any forward position and reverse position
Vehicle does not move in R position
No up±shift
No down±shift
Harsh engagement
Slip or Shudder
1st " 2nd
2nd " 3rd
3rd " O/D
O/D " 3rd
L position
2nd " 1st
D, 2 and L positions
D and 2 positions
2 position
Vehicle does not
move in:
No lock±up or No lock±up off
N " D
N " R
2nd " 3rd
3rd " O/D
Lock±up
Forward & Reverse (After warm±up)
Forward & Reverse (Just after engine starts)
R position
No engine braking
2nd
1st
3rd
2nd
1st
1st ~ 3rd
O/D
O/D
All position
Other than O/D
1st and 2nd
1st and R position
R position
Other than 2ndPoor acceleration
Engine stalls when starting off or stopping
O/D one±wayclutch (F
o)
O/D brake (B
o)
Torque converter
clutchO/D Planetary gear
unitO/D
direct clutch
(co)
1st reverse
brake (B
3)
AT1±62± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

DTC 62 63 No.1 No. 2 Solenoid Valve Circuit
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is done in combination with ON and OFF of the No.1 and No.2 solenoid valves controlled
by ECM. If an open or short circuit occurs in either of the solenoid valves, the ECM controls the remaining normal
solenoid to allow the vehicle to be operated smoothly (Fail safe function).
Fail Safe Function
If either of the solenoid valve circuits develops a short or an open, the ECM turns the other solenoid ON and
OFF to shift to the gear positions shown in the table below. The ECM also turns the lock±up solenoid valve OFF
at the same time. If both solenoids malfunction, hydraulic control cannot be performed electronically and must
be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops send-
ing current to the short circuited solenoid).
 
 
Position
 
 NORMAL
 
 NO.1 SOLENOID
MALFUNCTIONING 
 NO.2 SOLENOID
MALFUNCTIONING 
 BOTH SOLENOIDS
MALFUNCTIONING
 
 
Position 
 Solenoid valve 
 Gear
 
 Solenoid valve 
 Gear
 
 Solenoid valve 
 Gear
 
 Gear when shift
selector is manually
  No.1 No.2 Gear No.1 No.2 Gear No.1 No.2 Gear 
selector is manually
operated
  ON OFF 1st X ON 3rd ON X 1st O/D
 D ON ON 2nd X ON 3rd OFF X O/D O/D
  OFF ON 3rd X ON 3rd OFF X O/D O/D
  OFF OFF O/D X OFF O/D OFF X O/D O/D
  ON OFF 1st X ON 3rd ON X 1st 3rd
 2 ON ON 2nd X ON 3rd OFF X 3rd 3rd
  OFF ON 3rd X ON 3rd OFF X 3rd 3rd
 
L
 ON OFF 1st X OFF 1st ON X 1st 1st
 L ON ON 2nd X ON 2nd ON X 1st 1st
X: Malfunctions
Check the No.1 solenoid when diagnostic trouble code 62 is output and check and No.2 solenoid when
diagnostic trouble code 63 is output.
 DTC No. Diagnostic Trouble Code Detection Condition Trouble Area 
 
 
 
 
 
 
 
 
 
 
 
 
 
62, 63
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(a) Solenoid resistance is 8
or lower (short cir±
cuit) when solenoid is energized.
(b) Solenoid resistance is 100 k
or higher (open
circuit) when solenoid is not energized.
The ECM checks for an open or short circuit in the
No.1 and No.2 solenoid circuit when it changes
gear position.
The ECM records diag. trouble code 62 or 63 if
condition (a) or (b) is detected once, but it does
not blink the O/D OFF indicator light.
After the ECM detects the condition (a) or (b)
continuously 8 times or more in one±trip *, it
causes the O/D OFF indicator light to blink until
condition (a) or (b) disappears.
After that, if the ECM detects condition (a) or
(b) one, it starts blinking the O/D OFF indicator
light again. 
 
 
 
 
 
 
 
 
 
 
 
 
 

Solenoid valve

Harness or connector between solenoid and

ECM

ECM
* one±trip (1st trip) See page AT1±54 AT1±72
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Connect a voltmeter to the terminals TT and
E1 of the DLC2.
Turn ignition switch ON (Do not start the en-
gine).
Fully depress the accelerator pedal until the
voltmeter indicates 8 V and hold it.
Depress and release the brake pedal and
check the voltage.
Check stop light signal.
Brake pedal
Proceed to next circuit inspection shown on
matrix chart (See page AT1±58).
Check harness and connector between ECM and stop light switch
(See page IN±30).
Repair or replace harness or connector
Voltage
Depressed0 V
Released8 V
Check and replace ECM. AT1±84
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

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

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

(b) Check engine braking
While running in the L position, release the accelerator pedal
and check the engine braking effect.
(c) C h e c k f o r abnormal noise during acceleration and
deceleration.
6. R POSITION TEST
Shift into the R position and while starting at full throttle,
check for slipping.
CAUTION: Before conducting this test ensure that the
test area is free from personnel and obstruction.
7. P POSITION TEST
Stop the vehicle on a gradient (more than 55) and after shift-
ing into the P position, release the parking brake.
Then check to see that the parking lock pawl holds the ve-
hicle in place.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±41

MECHANICAL SYSTEM TESTS
STALL TEST
The object of this test is to check the overall performance of the transmission and engine by measuring
the stall speeds in the D and R positions.
NOTICE:
wDo the test at normal operating fluid temp. 50±805C (122±1765F).
wDo not continuously run this test longer than 5 seconds.
wTo ensure safety, conduct this test in a wide, clear, level area which provides good traction.
wThe stall test should always be carried out in pairs. One technician should observe the conditions of
wheels or wheel stoppers outside the vehicle while the other is doing the test.
MEASURE STALL SPEED
(a) Chock the 4 wheels.
(b) Fully apply the parking brake.
(c) Connect a tachometer to the engine.
(d) Start the engine and check idle.
(e) Keep you foot pressed firmly on the brake pedal.
(f) Shift into the D position. Fully depress the accelerator pedal.
Quickly read the stall speed.
Stall speed:
2,600+150 rpm
(g) Do the same test in R position.
Quickly read the stall speed.
Stall speed:
2,600+150 rpm
AT2±44± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

TIME LAG TEST
When the shift lever is shifted while the engine is idling, there will be a certain time lapse or lag before the
shock can be felt. This is used for checking the condition of the O/D direct clutch, forward clutch, direct
clutch, and first and reverse brake.
NOTICE:
wDo the test at normal operating fluid temp. 50±805C (122±1765F).
wBe sure to allow 1 minute interval between tests.
wTake 3 measurements and take the average value.
MEASURE TIME LAG
(a) Fully apply the parking brake
(b) Start the engine and check idle speed.
Idle speed:
650+50 rpm (In N position and air conditioner OFF)
(c) Shift the shift lever from N to D position. Using a stop watch, measure the time it takes from shifting the
lever until the shock is felt.
In same manner, measure the time lag for N " R.
Time lag:
N
"D Less than 1.2 seconds
N
"R Less than 1.5 seconds
AT2±46± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING