Engine TOYOTA SUPRA 1995 Service Manual Online

(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

PRELIMINARY CHECK
1. CHECK FLUID LEVEL
HINT:
wDrive the vehicle so that the engine and transmission
are at normal operating temperature.
Fluid temp.: 70±805C (158±1765F)
wOnly use the COOL position 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 oil level gauge 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 position.
If the level is at the low side, add fluid.
Fluid type:
ATF TYPE T±II or Equivalent
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:
ATF TYPE T±II or Equivalent
Capacity:
Dry fill: 8.2 liters (8.7 US qts, 7.2 Imp. qts)
Drain and refill: 1.9 liters (2.0 US qts, 1.6 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±805C (158±1765F) 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. AT2±42
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

5. 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.
6. 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 stated 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: 12 NVm (125 kgfVcm, 9 ftVlbf)
For continuity inspection of the park/neutral position switch,
see page AT2±101.
7. INSPECT IDLE SPEED
Idle speed:
650+50 rpm
(In N position and air conditioner OFF)
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±43

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

EVALUATION
 Problem Possible cause 
 
 (a) Stall speed low in D and Rpositions
 Engine output may be insufficient.
 Stator one±way clutch is operating properly
HINT: 
 
(a) Stall speed low in D and R positions. HINT:
If more than 600 rpm below the specified value, the
torque converter clutch could be faulty.
 
 (b) Stall speed high in Dposition
 Line pressure too low.
 Forward clutch slipping
 
 
(b) Stall speed high in D position Forward clutch sli ing
 No.2 one±way clutch not operating properly
 O/D one±way clutch not operating properly
 
 (c) Stall speed high in Rposition
 Line pressure too low
 Direct clutch slipping
 
 
(c) Stall speed high in R position. Direct clutch sli ing
 First and reverse brake slipping
 O/D clutch slipping
 
(d) Stall speed high in D and Rpositions
 Line pressure too low
Improper fluid level (d) Stall speed high in D and R positions. Improper fluid level
 O/D one±way clutch not operating properly
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±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±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

HYDRAULIC TEST
MEASURE LINE PRESSURE
NOTICE:
wDo the test at normal operating fluid temp. 50±805C (122±1765F)
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 side.
(c) Chock the 4 wheels.
(d) Fully apply the parking brake.
(e) Start the engine and check idling speed.
(f) Keep your left foot pressed firmly on the brake pedal and shift into D position.
(g) Measure the line pressure when the engine is idling.
(h) Fully depress the accelerator. Quickly read the highest line pressure when engine speed reaches stall
speed.
NOTICE: Release the accelerator pedal and stop test if the wheels begin to rotate before the engine
speed reaches specified stall speed.
(i) In the same manner, do the test in R position. AT2±48
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

(f) Fully apply the parking brake and chock the 4 wheels.
(g) Start the engine and check idling speed.
(h) Keep your left foot pressed firmly on the brake pedal and shift into D position.
(i) Measure the accumulator back pressure.
(j) With the conditions the same as in (h), ground the other probe or the test lead which has one end inserted
into the terminal SLN of the ECM harness side connector, then measure the accumulator back pressure
again.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±51

DTC.
No.Blinking
PatternCircuitDiagnostic Trouble Code Detection Condition
38
42
46
61
62
63
64
A/T fluid
temp.
sensor
No.1 vehicle
speed sensor
No.4 solenoid
valve
No.2 vehicle
speed sensor
No.1 solenoid
valve
No.2 solenoid
valve
No.3 solenoid
circuit
Either (a) or (b) are detected for 0.5 sec. or more:
(a) Temp. sensor resistance less than 79 
(b) After the engine has been operating for 15 minutes or
more, the resistance at the temp. sensor is more
than 156 k
All conditions below are detected for 4 secs. or more:
(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 or more
(c) Park/neutral position switch: OFF (Other than P or N
position)
All conditions below are detected for 1 sec. or more:
(2 trip detection logic)*3
(a) ECM output duty signal to No.4 solenoid in 90% or higher
duty ratio
(b) Current to No.4 solenoid: 330+100 mA or less
All conditions below are detected:
(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)
(1) Solenoid resistance of 8 or less is detected (*) 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 failure are detected less than 8 times, the ECM
memorizes the malfunction code but the O/D OFF indicator
light does not blink.
(1) Solenoid resistance of 8 or less is detected (*) 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 failure are detected less than 8 times, the ECM
memorizes the malfunction code but the O/D OFF indicator
light does not blink.
All conditions below are detected for 1 sec. or more:
(2 trip detection logic)*3
(a) ECM output duty signal to No.3 solenoid in 90% or higher
duty ratio
(b) Current to No.3 solenoid: 450+100 mA or less
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. AT2±54
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Chapter 1. Electronic Circuit
AT2±72AT2±75AT2±79AT2±82AT2±85AT2±89AT2±97
Suspect Area
Symptom
Vehicle does not move in any forward position and reverse
position
No up±shift
No down±shift
No lock±up
Vehicle does not move in particular position or positions
Harsh engagement
No engine braking
1st " 2nd
2nd " 3rd
3rd " O/D
O/D " 3rd
3rd " 2nd
2nd " 1st
N " D
Large shift shock or Engine stalls when starting off or stopping.
*No pattern select
No.1 Vehicle speed
sensor circuit
See Page
No lock±up off
Slip or Shudder
Poor acceleration
No kick±down
Lock±up
Any driving position
Forward and reverse
Any particular position
Shift point too high or too low
Up±shifts to 2nd while in L position
Up±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
No.1, No.2 solenoidcircuitNo.2 Vehicle speed
sensor circuitNo.4 solenoid
circuitNo.3 solenoid
circuit(Sub)±throttle
position sensor circuitO/D direct clutch
speed sensor circuit
* The automatic transmission in not shifted into the manual mode when the automatic transmission fluid
temperature is too high. AT2±64
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING