1997 TOYOTA SUPRA turn signal

DIAGNOSTIC TROUBLE CODE CHECK PROCEDURE
Diagnostic Trouble
Code Check (Make a
note of and then clear)Confirmation
of SymptomsDiagnostic Trouble
Code CheckProblem Condition
Diagnostic Trouble
Code DisplayProblem symptoms
existSame diagnostic
trouble code is
displayedProblem is still occurring in the diagnostic
circuit.
Normal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit.
(The diagnostic trouble code displayed
first is either for a past problem or it is a
secondary problem.)
No problem
symptoms existThe problem occurred in the diagnostic
circuit in the past.
Normal Code DisplayProblem symptoms
existNormal code is
displayedThe problem is still occurring in a place
other than in the diagnostic circuit.
No problem
symptoms existNormal code is
displayedThe problem occurred in a place other
than in the diagnostic circuit in the past.
IN-20- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
20 Author
: Date
:
1997 SUPRA (RM502U)
2. SYMPTOM CONFIRMATION AND DIAGNOSTIC TROUBLE CODE CHECK
The diagnostic system in the TOYOTA SUPRA fulfills various functions. The first function is the Diagnostic
Trouble Code Check in which a malfunction in the signal circuits to the ECU is stored in code in the ECU
memory at the time of occurrence, to be output by the technician during troubleshooting. Another function
is the Input Signal Check which checks if the signals from various switches are sent to the ECU correctly.
By using these check functions, the problem areas can be narrowed down quickly and troubleshooting can
be performed effectively. Diagnostic functions are incorporated in the following systems in the TOYOTA SU-
PRA.
SystemDiagnostic Trouble
Code CheckInput Signal Check
(Sensor Check)Other Diagnosis
Function
Engine
Automatic Transmission
Anti-Lock Brake System
ABS & Traction Control System
Supplemental Restraint System
Cruise Control
Air Conditioning (with Check
Mode)
 (with Check
Mode)









Diagnostic Test
Mode
Diagnostic Test
Mode
Actuator Check
In diagnostic trouble code check, it is very important to determine whether the problem indicated by the diag-
nostic trouble code is still occurring or occurred in the past but returned to normal at present. In addition,
it must be checked in the problem symptom check whether the malfunction indicated by the diagnostic
trouble code is directly related to the problem symptom or not. For this reason, the diagnostic trouble codes
should be checked before and after the symptom confirmation to determine the current conditions, as shown
in the table below. If this is not done, it may, depending on the case, result in unnecessary troubleshooting
for normally operating systems, thus making it more difficult to locate the problem, or in repairs not pertinent
to the problem. Therefore, always follow the procedure in correct order and perform the diagnostic trouble
code check.

34SUPRAÐNEW FEATURES
c. Operation
The hydraulic system of the ABS has 3 or 4 circuits. Although the hydraulic circuit described below has 1 circuit,
it is applicable to other circuits as well.
i) During Normal Braking (ABS not Activated)
During normal braking, the ABS is not activated and
the ECU dose not send control signal.
When the brake pedal is depressed, the fluid passes
from port A to port B, and then flows to the brake
wheel cylinder.
When the brake pedal is released, brake fluid returns
from the brake wheel cylinder to the master cylinder
through port B to port A and No. 1 Check Valve.

Condition of Actuator
Part Name
Signal from
ABS ECUOperation
Pressure
Holding ValveOFFPort AOpen
Pressure
Reduction
Valve
OFFPort BClosed
Pump MotorOFFRotating

Hydraulic Circuit
ii) During Emergency Braking (ABS Activated)
 Pressure Reduction Mode
When the wheel about to lock , the control signal from
the ECU causes port A to close and port D to open,
thus engaging the pressure reduction mode.
At this time the brake fluid flows from the wheel
cylinder, through ports C and D, to the reservoir
reducing the wheel pressure.
At the same time the brake fluid is pumped and
returned to the master cylinder.

Condition of Actuator
Part Name
Signal from
ABS ECUOperation
Pressure
Holding ValveONPort AClosed
Pressure
Reduction
Valve
ONPort DOpen
Pump MotorONRotating

Hydraulic Circuit

25 SUPRAÐ NEW FEATURES
NEW FEATURES
 EXTERIOR DESIGN
1. Headlights, Turn Signal Light and Front Bumper
Multi±reflector type headlights, which contain a multiple paraboloid reflector, have been adopted for the
high±beam headlights. Accordingly, the lens cut in headlights has been significantly decreased to improve the
appearance.
The shape of the turn signal light lenses has been matched to the curvature of the bumper in order to make them
appear integrated with the bumper. In addition, clear lenses are used, and the parking lights gave been changed from
those enclosed in the headlights to those enclosed in the turn signal lights.
A bar has been added to the air intake opening in the center of the front bumper.
2. Rear Combination Light
The lens cut of the rear combination lights has been changed from the vertical cut to the lateral cut. In addition, the
rear combination lights have adopted multi±reflectors. As a result of these changes a light design has been achieved
to give a sensor for translucency and depth.

22SUPRAÐOUTLINE OF NEW FEATURES
SUPRA
OUTLINE NEW FEATURES
The Supra, which represents Toyota's advanced automotive technology, has earned a reputation as a truly luxurious
sports car. The following changes have been made for the 1997 model year.
1. Model Line±Up

The JZA80L±ALPVZA model has been discontinued.

The JZA80L±ALFVZA and JZA80L±AJFVZA models have been added.
2. Exterior Design

The multi±reflector type headlights are adopted.

The design of the turn signal light, front bumper and rear combination light has been changed.
3. Interior Equipment
The front seats have been changed from the separate±headrest type seats of the '96 model to the integrated headrest
type seats without changing their basic design.
4. 2JZ±GTE Engine
An aluminum radiator core is adopted for weight reduction.
5. Differential

A differential gear ratio has been changed on he 2JZ±GE engine model.

A helical gear type torque±sensing LSD is available as an option on the 2JZ±GE engine model and 2JZ±GTE engine
with automatic transmission model.
6. Drive Shaft
An outboard joint of drive shaft has been changed from cross±groove type CVJ (Constant±Velocity Joint) to Rzeppa
type CVJ on the 2JZ±GE engine model.
7. Brakes

A master cylinder diameter has been changed on the 2JZ±GTE engine model.

An ABS has been changed to the 2±position solenoid valve type actuator.

BE-4
- BODY ELECTRICALBODY ELECTRICAL SYSTEM
1982 Author
: Date
:
1997 SUPRA (RM502U) Taillight does not light with light control SW in TAIL.
1. Taillight Relay (J/B No.1)
2. Integration Relay
3. Light Control Switch
4. Wire HarnessBE-17
BE-13
BE-17
Taillight does not go out with light control SW in OFF.
1. Taillight Relay (J/B No.1)
2. Integration Relay
3. Light Control switch
4. Wire HarnessBE-17
BE-13
BE-17
Headlight and Taillight do not light with engine running and light
control SW in OFF.
1. GAUGE Fuse (J/B No.1)
2. Generator L Terminal
3. D.R.L. Relay
4. D.R.L. No.2 Relay (R/B No.2)
5. D.R.L. No.3 Relay
6. Parking Brake Switch
7. Wire Harness
BE-17
BE-17
BE-17
BE-43
FOG LIGHT SYSTEM
SymptomSuspect AreaSee page
Fog light does not light with light control SW HEAD.
(Headlight is normal.)
1. FOG Fuse (R/B No.2)
2. HEAD Fuse (R/B No.2)
3. Fog Light Relay (R/B No.2)
4. Fog Light Switch
5. Wire Harness
BE-23
BE-23
Fog light does not light with light control SW HEAD.
(Headlight does not light)1. Headlight and Taillight system
2. Wire HarnessBE-15
Only one light does not light.1. Bulb
2. Wire Harness
TURN SIGNAL HAZARD WARNING SYSTEM
SymptomSuspect AreaSee page
ºHazardº and ºTurnº do not light up.
1. Hazard Warning Switch
2. Turn Signal Flasher
3. Wire HarnessBE-26
BE-26
The flashing frequency is abnormal.
1. Bulb
2. Turn Signal Flasher
3. Wire Harness
BE-26
Hazard warning light does not light up.
(Turn is normal.)1. HAZ-HORN Fuse (R/B No.2)
2. Wire Harness
Hazard warning light does not light up in one direction.1. Hazard Warning Switch
2. Wire HarnessBE-26
Turn signal does not light up.
(Combination meter, wiper and washer do not operate.)
1. TURN Fuse (J/B No.1)
2. Ignition Switch
3. Turn Signal Switch
4. Wire Harness
BE-13
BE-26
Turn signal does not light up.
1. TURN Fuse (J/B No.1)
2. Turn Signal Switch
3. Wire Harness
BE-26
Turn signal does not light up in one direction.1. Turn Signal Switch
2. Wire HarnessBE-26
Only one bulb does not light up.1. Bulb
2. Wire Harness

BE-8
- BODY ELECTRICALBODY ELECTRICAL SYSTEM
1986 Author
: Date
:
1997 SUPRA (RM502U) Security Indicator Light does not light up.
1. Light Emitting Diode
2. Theft Deterrent and Door Lock ECU
3. Wire Harness
DI-608
A/T Shift Position Indicator Light does not light up.
1. Bulb
2. Park/Neutral Position Switch
3. Light Control Rheostat
4. Meter Circuit
5. Wire Harness
DI-354
DI-423
BE-43
BE-40
MANU Indicator Light does not light up.
1. Bulb
2. ECM
3. Meter Circuit
4. Wire Harness
BE-40
O/D OFF Indicator Light does not light up.
1. Bulb
2. O/D Main Switch
3. ECM
4. Meter Circuit
5. Wire Harness
BE-43
DI-1
DI-145
BE-40
TRAC Indicator Light does not light up.
1. Bulb
2. ABS and Traction ECU
3. Meter Circuit
4. Wire Harness
BE-40
Turn Indicator Light does not light up.
1. Bulb
2. Turn Signal and Hazard Warning System
3. Meter Circuit
4. Wire Harness
BE-25
BE-40
High Beam Indicator Light does not light up.
1. Bulb
2. Headlight and Taillight System
3. Meter Circuit
4. Wire Harness
BE-15
BE-40
CRUISE Indicator Light does not light up.
1. Bulb
2. Cruise Control ECU
3. Meter Circuit
4. Wire Harness
DI-660
BE-40
SNOW Indicator Light does not light up.
1. Bulb
2. Traction ECU
3. Meter Circuit
4. Wire Harness
BE-40
ELECTRIC TENSION REDUCER SYSTEM
SymptomSuspect AreaSee page
Tension Reducer does not operate.
(Driver's and Passenger's)1. ECU-IG fuse (J/B No.1)
2. Wire Harness
Tension Reducer does not operate. (Only one side)
1. Buckle Switch
2. Tension Reducer Solenoid
3. Wire HarnessBE-54
BE-43

Z18224
Front Turn Signal and Hazard Waning Lights
HAZ-HORN Fuse Combination Switch
Light Control Switch
Turn Signal Flasher R/B No.4
J/B No.1
TURN Fuse
Rear Combination Lights
Rear Turn Signal and hazard Warning Lights R/B No.2







BE0DX-01
- BODY ELECTRICALTURN SIGNAL AND HAZARD WARNING SYSTEM
BE-25
2003 Author
: Date
:
1997 SUPRA (RM502U)
TURN SIGNAL AND HAZARD WARNING SYSTEM
LOCATION

BE0DY-02
Z09367
Right Turn
Left Turn
Connector ºAº
BE1843
2
Turn Signal Light Bulbs (21W)13
Z09334
BE-26
- BODY ELECTRICALTURN SIGNAL AND HAZARD WARNING SYSTEM
2004 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION
1. INSPECT TURN SIGNAL SWITCH CONTINUITY
Switch positionTester connectionSpecified condition
Left turnA1 - A5Continuity
Neutral-No continuity
Right turnA1 - A8Continuity
If continuity is not as specified, replace the switch.
2. INSPECT TURN SIGNAL FLASHER OPERATION
(a) Connect the terminal 2 to battery positive (+) terminal and
the terminal 3 to battery negative (-) terminal.
(b) Connect the 2 turn signal light bulbs parallel to each other
to terminals 1 and 3, check that the bulbs flash.
HINT:
The turn signal lights should flash between 60 and 120 times
per minute.
3. INSPECT HAZARD WARNING SWITCH CONTINUITY
ConditionTester connectionSpecified condition
Switch OFF7 - 10Continuity
Switch ON7 - 8
4 - 5 - 6 - 9Continuity
Illumination circuit2 - 3Continuity
If continuity is not as specified, replace the switch.
BE3QR-01