1995 TOYOTA SUPRA transmission fluid

EVALUATION
ProblemPossible cause Problem Possible cause
 
 
 
 
 
(a) Stall speed low in D and R positions.
 
 
 
 
 
wEngine output may be insufficient.
wStator one±way clutch is operating properly
HINT:
If more than 600 rpm below the specified value, the
torque converter clutch could be faulty.
 
 (b) Stall speed high in Dposition
wLine pressure too low
wForward clutch slipping
 
 
(b) Stall speed high in D position.Forward clutch sli ing
wNo.2 one±way clutch not operating properly
wO/D one±way clutch not operating properly
 
 
(c) Stall speed high in Rposition
wLine pressure too low
wDirect clutch slipping
 
 
(c) Stall speed high in R position.Direct clutch sli ing
wFirst and reverse brake slipping
wO/D clutch one±way clutch not operating properly
 
 (d) Stall speed high in D and Rpositions
wLine pressure too low
wImproper fluid level
 
(d) Stall speed high in D and R positions.wImproper fluid level
wO/D one±way clutch not operating properly
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±45

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±80
°C (122±176 °F).
wBe sure to allow a one 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:
700 + 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
AT1±46± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

HYDRAULIC TEST
MEASURE LINE PRESSURE
NOTICE:
wDo the test at normal operating fluid temp. 50±80 5C (122±176 5F).
wThe line pressure 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.
wBe careful to prevent the oil pressure gauge hose from interfering with the exhaust pipe.
(a) Warm up the transmission fluid.
(b) Remove the test plug on the transmission case left side and connect the oil pressure gauge (SST). SST
09992±00094 (Oil pressure gauge)
HINT: Connecting the oil pressure gauge will be made easier by moving LH side heat insulator aside.
(c) Fully apply the parking brake and chock the 4 wheels.
(d) Start the engine and check idling RPM.
(e) Keep your left foot pressed firmly on the brake pedal and shift into D position.
(f) Measure the line pressure when the engine is idling.
(g) Press the accelerator pedal all the way down. Quickly read the highest line pressure when engine speed
reaches stall speed.
(h) In the same manner, do the test in R position. AT1±48
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

SPECIFIED LINE PRESSURE
 Line pressure D position kPa (kgf/cm2,psi) R position kPa (kgf/cm2, psi)
 Idling363 422 (3 7 4 3 53 61)500 598 (5 1 6 1 73 88)Idling363±422 (3.7±4.3, 53±61)500±598 (5.1±6.1, 73±88) 
Stall902 1 147 (9 2 11 7 131 166)1 236 1 589 (12 6 16 2 179 230) Stall902±1,147 (9.2±11.7, 131±166)1,236±1,589 (12.6±16.2, 179±230)
If the measured pressures are not up to specified values, recheck the throttle cable adjustment and retest.
EVALUATION
 Problem Possible cause 
 
If the measured values at allpositions are higher
V Throttle cable out of adjustment
Throttle valve defective  If the measured values at all positions are higher.V Throttle valve defective
V Regulator valve defective
 
 
 If the measured values at allpositions are lower
V Throttle cable out of adjustment
V Throttle valve defective
Regulator valve defective 
 
If the measured values at all positions are lower.V Regulator valve defective
V Oil pump defective
V O/D direct clutch defective
 
Ifpressure is low in the Dposition onlyV D position circuit fluid leakage  If pressure is low in the D position only. D osition circuit fluid leakage
V Forward clutch defective 
 Ifpressure is low in the Rposition only
V R position circuit fluid leakage
Direct clutch defective  If pressure is low in the R position onlyV Direct clutch defective
V First and reverse brake defective
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±49

DTC
No.Blinking
PatternCircuitDiagnostic Trouble Code Detection Condition
38
42
Either (a) or (b) are detected for 0.5 sec. or more.
(a) Temperature sensor resistance less than 79 
(b) After the engine has been operating for 15 minutes or more,
the resistance at the temperature sensor is more than 156 k
All conditions below are detected 500 times or more continuously.
(2 trip detection logic) *3
(a) No No. 1 vehicle speed sensor signal in 16 pulses of No. 2
vehicle speed sensor signal.
(b) Vehicle speed: 9 km/h (5.6 mph) or more for 4 secs. or more.
(c) Park/neutral position switch: OFF (Other than P or N position)
A/T fluid
temp.
sensor
No. 1 vehicle
speed sensor
No. 2 vehicle
speed sensor
All conditions below are detected 500 times or more continuously.
(2 trip detection logic) *3
(a) No No. 2 vehicle speed sensor signal in 4 pulses of No. 1
vehicle speed sensor signal.
(b) Vehicle speed: 9 km/h (5.6 mph) or more for 4 secs. or more.
(c) Park/neutral position switch: OFF (Other than P or N position)
No. 1
solenoid
valve
(1) Solenoid resistance of 8 or less is detected (*) 8 times or
more when No. 1 solenoid is energized.
(2) Solenoid resistance of 100 k or more is detected (*) 8 times
or more when No. 1 solenoid is not energized.
(*) If the above failures are detected less than 8 times, the ECM
memorizes the malfunction code but the O/D OFF indicator
light does not blink.
No. 2
solenoid
valve
(1) Solenoid resistance of 8 or less is detected (*) 8 times or
more when No. 2 solenoid is energized.
(2) Solenoid resistance of 100 k or more is detected (*) 8 times
or more when No. 2 solenoid is not energized.
(*) If the above failures are detected less than 8 times, the ECM
memorizes the malfunction code but the O/D OFF indicator
light does not blink.
Lock±up
solenoid
valve
(a) Solenoid resistance is 8 or lower (short circuit) when
solenoid energized.
(b) Solenoid resistance is 100 k or higher (open circuit) when
solenoid is not energized.
(*) ECM memorizes diag. trouble code 64 if above (a) or (b)
condition is detected once or more, but ECM does not start
O/D OFF indicator light blinking.
61
62
63
64
DIAGNOSTIC TROUBLE CODE CHART
If a diagnostic trouble code is displayed during the diagnostic trouble code check, check the circuit listed
for that code in the table below and proceed to the page given. AT1±52
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

AT1±64
AT1±66
AT1±69
AT1±72
AT1±72
AT1±75
Trouble AreaO/D OFF Light *1
BlinksMemory *2See
Page

Harness or connector between A/T fluid temp. senter and
ECM.

A/T fluid temp. sensor.

ECM

Harness or connector between No. 1 vehicle speed sensor
and ECM.

No. 1 vehicle speed sensor.

Telltale light RH.

ECM

Harness or connector between No. 2 vehicle speed sensor
and ECM.

No. 2 vehicle speed sensor.

ECM

Harness or connector between No. 1 solenoid and ECM.

No. 1 solenoid valve.

ECM

Harness or connector between No. 2 solenoid and ECM.

No. 2 solenoid valve.

ECM

Harness or connector between lock±up solenoid and ECM.

Lock±up solenoid valve.

ECM
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT1±53

STANDARD VALUE OF ECM TERMINAL
* A = (E10), B = (E9) 
 Terminals
 
 Symbols
 
 Wiring
Color 
 Condition
 
 Standard
Value
 B76 ± B69 NSW±E1 B±WeBR IG ON Shift Lever; P or N position Below 3 V
 B76 ± B69 NSW ± E1 B±W eBR IG ON Shift Lever; Other than P or N position 9 ± 14 V
 B3 ± B23 SP2± ± SP2+ G eR IG OFF 560 ± 680

IG OFF10 ± 16
 B10 ± B69 S1 ± E1 W±R eBR Vehicle driving in 2nd gear position 9 ± 14
    IG ON 9 ± 14
    IG OFF 10 ± 16

 B9 ± B69 S2 ± E1 RL eBR Vehicle driving in 2nd or 3rd position 9 ± 14

    IG ON  Below 1.5 V
 B43 ± B65 VTA1±E2 YeBR±B IG ON Accel. pedal is not depressed Below 0.8 V
 B43 ± B65 VTA1 ± E2 Y eBR±B IG ON Accel. pedal is fully depressed 3.2 ± 4.9 V
B64 ± B65IDL1 ± E2ReBR±BIG ONAccel. pedal is not depressedBelow 3 V B64 ± B65 IDL1 ± E2 R eBR±B IG ON Accel. pedal is depressed 9 ± 14 V 
 A2 ± B65
 
 SP1 ± E2
 
 P eBR±B
 
 Ignition switch ON
Turn the rear wheel slowly 
 Repeat 0±8V
or above
 
A3 ± B69
 
KD±E1
 
YeBR
 
IG ON
 Kick±down SW; OFF
(Accel. pedal is not depressed) 9 ± 14 V
 
 
A3 ± B69 
 
KD ± E1 
 
Y eBR 
 
IG ON 
 Kick±down SW; ON
(Accel. pedal is fully depressed) 
 Below 3 V
 A9 ± B69 2±E1 LG±ReBR IG ON Shift Position; 2 position 7.5 ± 14 V
 A9 ± B69 2 ± E1 LG±R eBR IG ON Shift Position; Other than 2 position Below 1.5 V
 A10 ± B69 L±E1 G±BeBR IG ON Shift Position; L position 7.5 ± 14 V

A10 ± B69

L ± E1

G±B eBR

IG ON
Shift Position; Other than L positionBelow 1.5 V A12 ± B69 OD1 ± E1 BR±B eBR Ignition switch ON 4.5 ± 5.5 V 
A18 ± B69
 
M±E1
 
G±YeBR
 
IG ON
 Pattern select SW: MANU 7.5 ± 14 V
 A18 ± B69 M ± E1 G±Y eBR IG ON Pattern select SW: NORM Below 1.5 V
 A28 ± B69 OD2±E1 V±GeBR IG ON O/D main SW; ON 7.5 ± 14 V
 A28 ± B69 OD2 ± E1 V±G eBR IG ON O/D main SW; OFF Below 3 V
 B24 ± B65 OIL ± E2 BR±B eO A/T fluid temperature 110°C (230°F) Below 1 V
AT1±56± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Chapter 1. Electronic Circuit
AT1±66AT1±69AT1±72AT1±75AT1±77AT1±81AT1±79
No.1 Vehicle speedsensor circuitNo.2 Vehicle speed
sensor circuitNo.1, No.2 Sole-
noid circuitkick±down switch
circuitThrottle position
sensor circuitSL Solenoid
circuitPark/neutral posi-
tion switch circuit
See Page
Suspect Area
Symptom
Vehicle does not move in any forward position and reverse position
Vehicle does not move in particular position or positions
No up±shift
No down±shift
No lock±up
No lock±up off
Shift point too high or too low
Up±shifts to 2nd while in L positionUp±shifts to 3rd while in L position
Up±shifts to O/D from 3rd while O/D switch is OFF
Up±shifts to O/D from 3rd while engine is cold
Harsh engagement
Slip or Shudder
Poor acceleration
No kick±down
No engine braking
No pattern select*
Large shift shock or engine stalls when starting off or stopping.
Any particular position
Forward and reverse
Any driving position
Lock±up
N " D
1st " 2nd
2nd " 3rd
3rd " O/D
O/D " 3rd
3rd " 2nd
2nd " 1st
* The automatic transmission is not shifted into the manual mode when the automatic transmission
fluid temperature is too high. AT1±58
± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING