TOYOTA SUPRA 1995 Service Repair Manual

CAUTIONS, NOTICES, HINTS:
wCAUTIONS are presented in bold type, and indicate there is a possibility of injury to you or other
people.
wNOTICES are also presented in bold type, and indicate the possibility of damage to the components
being repaired.
wHINTS are separated from the text but do not appear in bold. They provide additional information to
help you perform the repair efficiently.
SI UNIT
The UNITS given in this manual are primarily expressed according to the SI UNIT (International System
of Unit), and alternately expressed in the metric system and in the English System.
Example:
Torque: 30 NVm (310 kgfVcm, 22 ftVlbf)
IDENTIFICATION INFORMATION
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number is stamped on the vehicle
identification number plate and certification label.
A. Vehicle Identification Number Plate
B. Certification Label
ENGINE SERIAL NUMBER
The engine serial number is stamped on the engine block as
shown. IN±4
± INTRODUCTIONIDENTIFICATION INFORMATION

GENERAL REPAIR INSTRUCTIONS
1. Use fender, seat and floor covers to keep the vehicle clean
and prevent damage.
2. During disassembly, keep parts in the appropriate order to
facilitate reassembly.
3. Observe the following:
(a) B e fo re pe rfo rmin g ele ctrica l wo rk, disconnect the
negative (±) terminal cable from the battery.
(b) If it is necessary to disconnect the battery for inspection
or repair, always disconnect the negative (±) terminal
cable which is grounded to the vehicle body.
(c) To prevent damage to the battery terminal, loosen the
cable nut and raise the cable straight up without twisting
or prying it.
(d) Clean the battery terminals and cable ends with a clean
shop rag. Do not scrape them with a file or other
abrasive objects.
(e) Install the cable ends to the battery terminals with the
nut loose, and tighten the nut after installation. Do not
use a hammer to tap the cable ends onto the terminals.
(f) Be sure the cover for the positive (+) terminal is properly
in place.
4. Check hose and wiring connectors to make sure that they are
secure and correct.
5. Non±reusable parts
(a) Always replace cotter pins, gaskets, O±rings and oil
seals etc. with new ones.
(b) Non±reusable parts are indicated in the component
illustrations by the º
rº symbol.
6. Precoated parts
Precoated parts are bolts and nuts, etc. that are coated with
a seal lock adhesive at the factory.
(a) If a precoated part is retightened, loosened or caused
to move in any way, it must be recoated with the
specified adhesive.
± INTRODUCTIONGENERAL REPAIR INSTRUCTIONSIN±5

(b) Wh e n re u sin g pre co a te d pa rts, cle a n off th e old
adhesive and dry with compressed air. Then apply the
specified seal lock adhesive to the bolt, nut or threads.
(c) P re co a te d pa rts are in d ica te d in th e co mponent
illustrations by the º
º symbol.
7. When necessary, use a sealer on gaskets to prevent leaks.
8. Carefully observe all specifications for bolt tightening
torques. Always use a torque wrench.
9. Use of special service tools (SST) and special service
materials (SSM) may be required, depending on the nature
of the repair. Be sure to use SST and SSM where specified
and follow the proper work procedure. A list of SST and SSM
can be found in the preparation part at the front of each
section in this manual.
10. When replacing fuses, be sure the new fuse has the correct
amperage rating. DO NOT exceed the rating or use one with
a lower rating.
FUSE
MEDIUM CURRENT FUSE
HIGH CURRENT FUSE
FUSIBLE LINK
CIRCUIT BREAKER
IN±6± INTRODUCTIONGENERAL REPAIR INSTRUCTIONS

11. Care must be taken when jacking up and supporting the
vehicle. Be sure to lift and support the vehicle at the proper
locations (See page IN±36).
(a) If the vehicle is to be jacked up only at the front or rear
end, be sure to block the wheels at the opposite end in
order to ensure safety.
(b) After the vehicle is jacked up, be sure to support it on
stands. It is extremely dangerous to do any work on a
vehicle raised on a jack alone, even for a small job that
can be finished quickly.
12. Observe the following precautions to avoid damage to the
following parts:
(a) Do not open the cover or case of the ECU, ECM, PCM
or TCM unless absolutely necessary. (If the IC terminals
are touched, the IC may be destroyed by static
electricity.)
(b) To disconnect vacuum hoses, pull on the end, not the
middle of the hose.
(c) To pull apart electrical connectors, pull on the connector
itself, not the wires.
(d) Be careful not to drop electrical components, such as
sensors or relays. If they are dropped on a hard floor,
they should be replaced and not reused.
(e) When steam cleaning an engine, protect the distributor,
air filter, and VCV from water.
(f) Ne ve r use an imp a ct wre n ch to re mo ve or in sta ll
temperature switches or temperature sensors.
(g) When checking continuity at the wire connector, insert
the tester probe carefully to prevent terminals from
bending.
(h) When using a vacuum gauge, never force the hose onto
a connector that is too large. Use a step±down adapter
instead. Once the hose has been stretched, it may leak.
13. Tag hoses before disconnecting them:
(a) When disconnecting vacuum hoses, use tags to identify
how they should be reconnected.
(b) After completing a job, double check that the vacuum
hoses are properly connected. A label under the hood
shows the proper layout.
± INTRODUCTIONGENERAL REPAIR INSTRUCTIONSIN±7

14. Unless otherwise stated, all resistance is measured at an
ambient temperature of 20°C ( 6 8°F). Because the
resistance may be outside specifications if measured at high
temperatures immediately after the vehicle has been
running, measurements should be made when the engine
has cooled down. IN±8
± INTRODUCTIONGENERAL REPAIR INSTRUCTIONS

FOR VEHICLES WITH DATA LINK
CONNECTOR 2 (DLC2)
The DLC2 is provided inside the cabin (located under the left
side instrument panel) as a connector exclusively for diagno-
sis of data from the Engine, Automatic Transmission, ABS,
A/C, Airbag, Traction Control and Cruise Control System to
improve serviceability. The DLC1 inside the engine compart-
ment is used for engine adjustment.
Connecting the following terminals of the DLC2 to terminal E
1
selects the diagnosis mode shown.
NOTICE: Never make a mistake with the terminal connection
position as this will cause a malfunction.
 Terminal Diagnosis Mode (System)
 
 TE1 
 Engine and automatic transmission (Normal
mode)
 TE2 and TE1 Engine and automatic transmission (Test mode) 
 TC 
 ABS, A/C, Airbag, Traction Control and
Cruise Control System
 TT Automatic transmission
Refer to the respective system for the inspection method.
HINT: By connecting the DLC2 up to a monitor specifically de-
signed for use with the DLC2, the diagnosis result for each
system can be read easily.
± INTRODUCTIONFOR VEHICLES WITH DATA LINK CONNECTOR 2 (DLC2)IN±9

PRECAUTION
FOR VEHICLES EQUIPPED WITH SRS
AIRBAG
The 1995 SUPRA is equipped with an SRS (Supplemental
Restraint System), such as the driver airbag, front passenger
airbag and seat belt pretensioners.
Failure to carry out service operations in the correct se-
quence could cause the supplemental restraint system to un-
expectedly deploy during servicing, possibly leading to a seri-
ous accident.
Further, if a mistake is made in servicing the supplemental re-
straint system, it is possible the SRS may fail to operate when
required. Before servicing (including removal or installation
of parts, inspection or replacement), be sure to read the fol-
lowing items carefully, then follow the correct procedure de-
scribed in this manual.
1. Malfunction symptoms of the supplemental restraint system
are difficult to confirm, so the diagnostic trouble codes
become the most important source of information when
troubleshooting. When troubleshooting the supplemental
restraint system, always inspect the diagnostic trouble codes
before disconnecting the battery (See page RS±41).
2. Work must be started after 90 seconds from the time the
ignition switch is turned to the LOCK position and the
negative (±) terminal cable is disconnected from the
battery.
(The supplemental restraint system is equipped with a
back±up power source so that if work is started within 90
seconds of disconnecting the negative (±) terminal cable
from the battery, the SRS may deploy.) IN±10
± INTRODUCTIONPRECAUTION

When the negative (±) terminal cable is disconnected from
the battery, memory of the clock and audio systems will be
cancelled. So before starting work, make a record of the con-
tents memorized by the audio memory system. When work
is finished, reset the audio systems as before and adjust the
clock.
This vehicle has power tilt and power telescopic steering,
power seat, power outside rear view mirror and power shoul-
der belt anchorage, which are all equipped with memory
function, it is not possible to make a record of the memory
contents. So when the work is finished, therefore it will be
necessary to explain this fact to the customer, and ask the
customer to adjust the features and reset the memory.
To avoid erasing the memory of each memory system, never
use a back±up power supply from outside the vehicle.
3. Even in cases of a minor collision where the SRS does not
deploy, the steering wheel pad, front passenger airbag
assembly and front airbag sensors should be inspected (See
pages RS±10, 20, 30).
4. Never use SRS parts from another vehicle. When replacing
parts, replace them with new parts.
5. Before repairs, remove the airbag sensors if shocks are likely
to be applied to the sensors during repairs.
6. Never disassemble and repair the front airbag sensors,
center airbag sensor assembly, steering wheel pad or front
passenger airbag assembly in order to reuse it.
7. If the front airbag sensors, center airbag sensor assembly,
steering wheel pad, front passenger airbag assembly or seat
belt pretensioners have been dropped, or if there are cracks,
dents or other defects in the case, bracket or connector,
replace them with new ones.
8. Do not expose the front airbag sensors, center airbag sensor
assembly, steering wheel pad, front passenger airbag
assembly or seat belt pretensioners directly to hot air or
flames.
9. Use a volt/ohmmeter with high impedance (10 k
/V
minimum) for troubleshooting of the electrical circuit.
10. Information labels are attached to the periphery of the SRS
components. Follow the instructions on the notices.
11. After work on the supplemental restraint system is
completed, perform the SRS warning light check (See page
RS±44).
± INTRODUCTIONPRECAUTIONIN±11

Front Airbag Sensor
1. Never reuse the front airbag sensors involved in a collision
that activated the supplemental restraint system. (Replace
both left and right airbag sensors.)
2. Install the front airbag sensor with the arrow on the sensor
facing toward the front of the vehicle.
3. The front airbag sensor set bolts have been anti±rust treated.
When the sensor is removed, always replace the set bolts
with new ones.
4. The front airbag sensor is equipped with an electrical
connection check mechanism. Be sure to lock this
mechanism securely when connecting the connector. If the
connector is not securely locked, a malfunction code will be
detected by the diagnosis system (See page RS±7).
Spiral Cable (in Combination Switch)
The steering wheel must be fitted correctly to the steering col-
umn with the spiral cable at the neutral position, otherwise
cable disconnection and other troubles may result. Refer to
page SR±14 of this manual concerning correct steering
wheel installation.
Steering Wheel Pad (with Airbag)
1. When removing the steering wheel pad or handling a new
steering wheel pad, it should be placed with the pad top
surface facing up.
In this case, the twin±lock type connector lock lever should
be in the locked state and care should be taken to place it so
the connector will not be damaged. In addition do not store
a steering wheel pad on top of another one. Storing the pad
with its metallic surface up may lead to a serious accident if
the airbag inflates for some reason.
2. Never measure the resistance of the airbag squib. (This
may cause the airbag to deploy, which is very
dangerous.)
3. Grease should not be applied to the steering wheel pad and
the pad should not be cleaned with detergents of any kind.
4. Store the steering wheel pad where the ambient temperature
remains below 93°C (200°F), without high humidity and
away from electrical noise. IN±12
± INTRODUCTIONPRECAUTION

5. When using electric welding, first disconnect the airbag
connector (yellow color and 2 pins) under the steering
column near the combination switch connector before
starting work.
6. When disposing of a vehicle or the steering wheel pad
alone, the airbag should be deployed using an SST
before disposal (See page RS±13). Perform the operation
in a safe place away from electrical noise.
Front Passenger Airbag Assembly
1. Always store a removed or new front passenger airbag
assembly with the airbag door facing up. Storing the air-
bag assembly with the airbag door facing down could
cause a serious accident if the airbag inflates.
2. Never measure the resistance of the airbag squib. (This
may cause the airbag deploy, which is very dangerous.)
3. Grease should not be applied to the front passenger airbag
assembly and the airbag door should not be cleaned with
detergents of any kind.
4. Store the airbag assembly where the ambient temperature
remains below 93°C (200°F), without high humidity and
away from electrical noise.
± INTRODUCTIONPRECAUTIONIN±13