Engine TOYOTA SUPRA 1995 Service Workshop Manual

(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 5°) 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.
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PRELIMINARY CHECK
1. CHECK FLUID LEVEL
HINT:
wDrive the vehicle so that the engine and transmission
are at normal operating temp..
Fluid temp. 70±80 °C (158±176 °F)
wOnly use the COOL range on the dipstick as a rough
reference when the fluid is replaced or the engine does
not run.
(a) Park the vehicle on a level surface and set the parking brake.
(b) With the engine idling and the brake pedal depressed, shift
the shift lever into all positions from P to L position and return
to P position.
(c) Pull out the transmission dipstick and wipe it clean.
(d) Push it back fully into the pipe.
(e) Pull it out and check that the fluid level is in the HOT range.
If the level is at the low side, add fluid.
Fluid type:
DEXRON[ II
NOTICE: Do not overfill.
2. CHECK FLUID CONDITION
If the fluid smells burnt or is black, replace it.
3. REPLACE TRANSMISSION FLUID
(a) Remove the drain plug and drain the fluid.
(b) Reinstall the drain plug securely.
(c) With the engine OFF, add new fluid through the oil filler pipe.
Fluid type:
DEXRON[ II
Capacity:
Dry fill: 7.2 liters (7.6 US qts, 6.3 Imp. qts)
Drain and refill: 1.6 liters (1.7 US qts, 1.4 Imp. qts)
(d) Start the engine and shift the shift lever into all positions from
P to L position and then shift into P position.
(e) With the engine idling, check the fluid level. Add fluid up to the
COOL level on the dipstick.
(f) Check the fluid level at the normal operating temperature
70±80 5C (158±176 5F) and add as necessary.
NOTICE: Do not overfill.
4. CHECK FLUID LEAKS
Check for leaks in the transmission.
If there are leaks, it is necessary to repair or replace O±rings,
seal packings, oil seals, plugs or other parts. AT1±42
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5. INSPECT AND ADJUST THROTTLE CABLE
(a) Check that the throttle valve is fully closed.
(b) Check that the inner cable is not slack.
(c) Measure the distance between the outer cable end and
stopper on the cable.
Standard distance:
0±1 mm (0±0.04 in.)
If the distance is not standard, adjust the cable by the adjust-
ing nuts.
6. INSPECT AND ADJUST SHIFT LEVER POSITION
When shifting the shift lever from the N position to other posi-
tions, check that the lever can be shifted smoothly and accu-
rately to each position and that the position indicator correctly
indicates the position.
If the indicator is not aligned with the correct position, carry
out the following adjustment procedures:
(a) Loosen the nut on the control shaft lever.
(b) Push the control shaft lever fully rearward.
(c) Return the control shaft lever 2 notches to N position.
(d) Set the shift lever to N position.
(e) While holding the shift lever lightly toward the R position side,
tighten the shift lever nut.
(f) Start the engine and make sure that the vehicle moves
forward when shifting the lever from the N to D position and
reverses when shifting it to the R position.
7. INSPECT AND ADJUST PARK/NEUTRAL POSITION
SWITCH
Check that the engine can be started with the shift lever only
in the N or P position, but not in other positions.
If not as started above, carry out these adjustment proce-
dures:
(a) Loosen the park/neutral position switch bolt and set the shift
lever to the N position.
(b) Align the groove and neutral basic line.
(c) Hold in position and tighten the bolt.
Torque: 13 NVm (130 kgfVcm, 9 ftVlbf)
For continuity inspection of the park/neutral position switch,
see page AT1±81.
8. INSPECT IDLE SPEED
Idle speed:
700 + 50 rpm
(In N position and air conditioner OFF)
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MECHANICAL SYSTEM TEST
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±80 °C (122±176 °F).
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) Connect a tachometer to the engine.
(c) Fully apply the parking brake.
(d) Keep your left foot pressed firmly on the brake pedal.
(e) Start the engine.
(f) Shift into the D position. Fully depress the accelerator pedal with your right foot. Quickly read the stall
speed.
Stall speed:
2,450 + 150 rpm
(g) Do the same test in R position.
Quickly read the stall speed.
Stall speed:
2,450 + 150 rpm
AT1±44± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

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
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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
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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
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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
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AT1±83AT1±85AT1±88AT1±91AT1±64EG±312AT1±56AT1±60AT1±62
Stop light switch
circuitPattern select switch
circuitO/D switch O/D OFF
indicator light circuitECMA/T fluid temp.
sensor circuitO/D cancel signal
circuitEngine coolant
temp. switch circuitOFF±Vehicle repairmatrix chartOn±Vehicle repairmatrix chart
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