TOYOTA SUPRA 1995 Service Repair Manual

2. MEASURE DRIVE PLATE RUNOUT AND INSPECT RING
GEAR
Set up a dial indicator and measure the drive plate runout.
Maximum runout:
0.20 mm (0.0079 in.)
If runout exceeds 0.20 mm (0.0079 in.) or if the ring gear is
damaged replace the drive plate. If installing a new drive
plate, note the orientation of spacers and tighten the bolts.
Torque: 64 NVm (650 kgfVcm, 47 ftVlbf)
3. MEASURE TORQUE CONVERTER CLUTCH SLEEVE
RUNOUT
(a) Temporarily mount the torque converter clutch to the drive
plate. Set up a dial indicator.
Maximum runout:
0.30 mm (0.0118 in.)
If runout exceeds 0.30 mm (0.0118 in.), try to correct by reori-
enting the installation of the converter clutch.
If excessive runout cannot be corrected, replace the torque
converter clutch.
HINT: Mark the position of the converter clutch to ensure cor-
rect installation.
(b) Remove the torque converter clutch.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONASSEMBLY REMOVAL AND INSTALLATIONAT2±27

SHIFT LOCK SYSTEM
COMPONENT PARTS LOCATION
WIRING DIAGRAM
AT2±28± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONSHIFT LOCK SYSTEM

ELECTRIC CONTROL COMPONENTS
INSPECTION
1. INSPECT SHIFT LOCK CONTROL ECU
Using a voltmeter, measure the voltage at each terminal.
 Connector Terminal Measuring condition Voltage (v)
  ACC ± E IG SW ACC 10 ± 14
  IG ± E IG SW ON 10 ± 14 
A
 STP ± E Depress brake pedal 10 ± 14 
 
A 
 
 
 (1) IG SW ACC and P position
 
 0
  KLS ± E (2) R, N, D, 2, L position 7.5 ± 11
   (3) R, N, D, 2, L position (after one second) 6 ± 9.5
   (1) IG SW ON and P position 0
 
B
 
SLS(+)SLS( )
 (2) Depress brake pedal 8 ± 13.5
 B SLS(+)± SLS(±) (3) Depress brake pedal (after 20 seconds) 6 ± 8.5
   (4) R,N,D,2,L position 0  
PP
 
(1) IG SW ON, P position and depress brake pedal
 0  P1±P (1) IG SW ON, P osition and de ress brake edal 
 
C
 P1 ± P (2) R,N,D,2,L position 9 ± 13.5
 C 
PP
 (1) IG SW ACC and P position 9 ± 13.5
P2±P(1) IG SW ACC and P osition 
 
 
 
P2 ± P 
 (2) R,N,D,2,L position
 
 0
2. INSPECT SHIFT LOCK SOLENOID
(a) Disconnect the solenoid connector.
(b) Usin g an oh mme te r, me a su re th e re sista n ce be twe e n
terminals 1 and 2.
Standard resistance:
20±28

If resistance value is not as specified, replace the solenoid.
(c) Apply the battery positive voltage between terminals 1 and
2. At this time, confirm that the solenoid operates.
If the solenoid does not operated, replace the solenoid.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONSHIFT LOCK SYSTEMAT2±29

3. INSPECT KEY INTERLOCK SOLENOID
(a) Disconnect the solenoid connector.
(b) Usin g an oh mme te r, me a su re th e re sista n ce be twe e n
terminals 1 and 2.
Standard resistance:
12±17

If resistance value is not as specified, replace the solenoid.
(c) Touch the solenoid with your finger and check that solenoid
operation can be felt when battery positive voltage is applied
intermittently to the terminals 1 and 2.
If the solenoid does not operate, replace the solenoid.
4. INSPECT SHIFT LOCK CONTROL SWITCH
Inspect that there is continuity between each terminal.
 
 Shift position
 
 Tester condition to
terminal number 
 Specified value
 
 P position (Release
button is not pushed) 
 P±P1
 
 Continuity
 R, N, D, 2, L position P±P2
 Continuity
AT2±30± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONSHIFT LOCK SYSTEM

TROUBLESHOOTING
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±31

Vehicle Brought to Workshop
Customer Problem Analysis
P. AT2±33
Check and Clear Diagnostic Trouble Codes (Precheck)
P. AT2±34 ~AT2±35
Problem Symptom Confirmation
P. AT2±37
Symptom Simulation
P. IN±24
Diagnostic Trouble Code Check
P. AT2±34 ~AT2±35
Preliminary Check
P. AT2±42
Diagnostic Trouble Code Check
P. AT2±54
Shift Position Signal Check
P. AT2±36
Mechanical System Tests
P. AT2±44
Manual Shifting Test
P. AT2±53
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. AT2±62
Chapter 1
(Electronic)Chapter 2
(On±Vehicle)Chapter 3
(OFF±Vehicle)
P. AT2±66P. AT2±64
Circuit
Inspection
Main Throttle Signal Check

Stop Light Signal Check

Kick±Down Signal Check
P. AT2±68
Parts Inspection
P. AT2±70 ~AT2±115
Identification of ProblemRepairConfirmation TestEND
HOW TO PROCEED WITH TROUBLESHOOTING
AT2±32± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

CUSTOMER PROBLEM ANALYSIS
 
 Electronically Controlled
Transmission Check Sheet
Inspector 's
Name:
 
 
 
 
 
 Registration No.
 
 
 
Customer 's Name 

 
Registration Year 
// 
 
 
 
 
 Frame No.
 
 
 
 
 
Date Vehicle
Brought In
 
 
 
//
 
 
 
Odometer Reading
 
 
 
km
Miles
 
 
Date Problem
Occurred 
 
//
 How often Does ContinuousIntermittent ( times a day) 
How often Does
Problem Occur?  Continuous  Intermittent (times a day)
  Vehicle does not move. (Any position Particular position)
 
 
 
 No up±shift ( 1st " 2nd  2nd " 3rd  3rd " O/D)
  No down±shift ( O/D " 3rd  3nd " 2rd  2rd " 1st)
 
 
 
 Lock±up malfuction
 Symptoms Shift point too high or too low.
 
 
 
 Harsh engagement ( N " D  Lock±up  Any drive position)
  Slip or shudder
 
 
 
 No Kick±down
  No pattern select
 
 
 
 Others
()
 
  Check Item
 
 Malfunction
Indicator Lamp 
 Normal Remains ON
 Diagnostic
Trouble Code 1st Time Normal CodeMalfunction Code (Code )
 
 
Trouble Code
(O/D OFF Indi-
cator LIght) 
 2nd Time
 
 Normal CodeMalfunction Code (Code )
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±33

DIAGNOSIS SYSTEM
The automatic transmission has built±in self±diagnostic
functions. If a malfunction occurs in the system, the ECM
stores the diagnostic trouble code in memory and the O/D
OFF (Overdrive OFF) indicator light blinks to inform the driv-
er. The diagnostic trouble code stored in memory can be read
out by the following procedure.
O/D OFF INDICATOR LIGHT INSPECTION
1. Turn the ignition switch ON.
2. Check if the O/D OFF indicator light lights up when the O/D
main switch is pushed out to OFF and goes off when the O/D
main switch is pushed in to ON.
HINT: If the O/D OFF indicator light does not light up or stay
on all the time, carry out the check for ºO/D OFF Indicator
Light Circuitº on page AT2±108.
DIAGNOSTIC TROUBLE CODE CHECK
1. Turn the ignition switch ON, but do not start the engine.
2. Push in the O/D main switch to ON.
HINT: Warning and diagnostic trouble codes can be read only
when the O/D main switch is ON. If it is OFF, the O/D OFF indi-
cator light up will light continuously and will not blink.
3. Using SST, connect terminals TE1 and E1 of the DLC 1 or
DLC2.
SST 09843±18020
4. Read the diagnostic trouble code indicated by the number of
times the O/D OFF indicator light blinks
(See next page).
HINT: If the system is operating normally, the light will blink
2 times per second. AT2±34
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

The trouble code is indicated as shown in the illustration at
left (Diagnostic trouble code º42º is shown as an example).
HINT: When 2 or more trouble codes are stored in memory,
the lower±numbered code is displayed first.
If no diagnostic trouble code is output, or if a diagnostic
trouble code is output even though no diagnostic trouble
code output operation is performed, check the TE1 terminal
circuit on page AT2±113
ECM DATA MONITOR USING TOYOTA
HAND±HELD TESTER
1. Hook up the TOYOTA hand±held tester to the DLC2.
2. Monitor the ECM data by following the prompts on the tester
screen.
HINT: TOYOTA hand±held tester has a ºSnapshotº function
which records the monitored data.
Please refer to the TOYOTA hand±held tester operator's
manual.
CANCELING DIAGNOSTIC TROUBLE
CODE
After repair of the trouble area, the diagnostic trouble code
retained in the ECM memory must be canceled out by remov-
ing the EFI No.1 fuse for 10 seconds or more, with the ignition
switch OFF.
Check that the normal code is output after connecting the
fuse.
ECM TERMINALS STANDARD VALUE
ECM TERMINAL VALUES
MEASUREMENT BY USING TOYOTA BREAK±OUT ±BOX
AND TOYOTA HAND±HELD TESTER
1. Hook up the TOYOTA break±out±box and TOYOTA
hand±held tester to the vehicle.
2. Read the ECM input/output values by following the prompts
on the tester screen.
HINT: TOYOTA hand±held tester has ºSnapshotº function.
This record the measured values and is effective in the diag-
nosis of intermittent problems.
Please refer to the TOYOTA hand±held tester/ TOYOTA
break±out±box operator's manual for further details.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±35

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 10 km/h, 6 mph)
Check up±shifting together with terminal TT voltage.
 Gear Position Terminal TT output voltage 1st Gear 0 V 
 2nd Gear
 
 2 V
 3rd Gear 4 V
 3rd Lock±up 5 V
 O/D 6 V
 O/D Lock±up 7 V
HINT: Check for light shocks from up±shifting and for
changes in the tachometer.
If terminal TT Output voltage check cannot be done, do the
check of TT terminal circuit on page AT2±115. AT2±36
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING