1997 TOYOTA SUPRA brake

ABS Antilock Brake System
A/C Air Conditioner
assy assembly
ECT Electronic Controlled Transmission
ECU Electronic Control Unit
e.g. Exempli Gratia (for Example)
Ex. Except
FWD Front Wheel Drive Vehicles
4WD Four Wheel Drive Vehicles
in. inch
LH Left-hand
LHD Left-hand Drive
MIG Metal Inert Gas
M/Y Model Year
PPS Progressive Power Steering
RH Right-hand
RHD Right-hand Drive
SRS Supplemental Restraint System
w/ with
w/o without
ABBREVIATIONS USED IN THIS MANUAL
For convenience, the following abbreviations are used in this
manual.
INTRODUCTIONIN-16

CodeMaterial
nameHeat*
resistant
temperature
limit °C (°F)Resistance to
alcohol or gasolineNotes
AASAcrylonitrile
Acrylic Styrene80
(176)Alcohol is harmless if applied
only for short time in small
amounts (e.g., quick wiping to
remove grease).Avoid gasoline and
organic or aromatic
solvents.
ABSAcrylonitrile
Butadiene Styrene80
(176)Alcohol is harmless if applied
only for short time in small
amounts (e.g., quick wiping to
remove grease).Avoid gasoline and
organic or aromatic
solvents.
AESAcrylonitrile
Ethylene Styrene80
(176)Alcohol is harmless if applied
only for short time in small
amounts (e.g., quick wiping to
remove grease).Avoid gasoline and
organic or aromatic
solvents.
BMCBulk
Moulding
Compound150
(302)Alcohol and gasoline are
harmless.Most solvents are
harmless.
CABCellulose
Acetate80
(176)Alcohol is harmless if applied
only for short time in small
amounts (e.g., quick wiping to
remove grease).Avoid gasoline and
organic or aromatic
solvents.
EPDMEthylene
Propylene100
(212)Alcohol is harmless.
Gasoline is harmless if applied
only for short time in small
amounts.Most solvents are
harmless but avoid
dipping in gasoline,
solvents, etc.
PAPolyamide
(Nylon)80
(176)Alcohol and gasoline are
harmless.Avoid battery acid.
PBTPolybutylene
Terephthalate160
(320)Alcohol and gasoline are
harmless.Most solvents are
harmless.
PCPolycarbonate120
(248)Alcohol is harmless.Avoid gasoline, brake
fluid, wax, wax removers
and organic solvents.
Avoid alkali.
PEPolyethylene80
(176)Alcohol and gasoline are harmless.Most solvents are
harmless.
PETPolyethylene
Terephthalate75
(176)Alcohol and gasoline are
harmless.Avoid dipping in water.
HANDLING PRECAUTIONS
1. The repair procedure for plastic body parts must conform with the type of plastic material.
2. Plastic body parts are identified by the codes in the following chart.
3. When repairing metal body parts adjoining plastic body parts (by brazing, frame cutting, welding,
painting etc.), consideration must given to the property of the plastic.
* Temperatures higher than those listed here may result in material deformation during repair.
PLASTIC BODY PARTSPP-2

S05426
From
BatteryR/B
No.2 2
2A
ALT
R/B
No.2
POWER
22W-L
J/B No.1 210
1B 1ESTOP
WStop Light
Switch
21G-W11
IJ1G-W4
A
STPECM
J/B
No.1 1
101H
1C
Light
Failure
Sensor
To Stop LightG-W
7
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-279
507 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1520 Stop Light Switch Signal Malfunction
Only for A/T
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut-off engine speed. (The fuel cut-off engine speed is
reduced slightly when the vehicle is braking.)
DTC No.DTC Detecting ConditionTrouble Area
P1520
The stop light switch does not turn off even once the vehicle is
driven.
(2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
DI4TK-01

A00726
ON
ONBrake Pedal
DepressedBrake Pedal
Released
Check Harness A
ECM
A4
STP(+)
DI-280
- DIAGNOSTICSENGINE (2JZ-GTE)
508 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operation of stop light.
PREPARATION:
Check if the stop lights go on and off normally when the brake
pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check STP signal.
When using TOYOTA hand-held tester:
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand-held tester.
OK:
Break pedal is depressed: STP ... ON
Break pedal is released: STP ... OFF
When not using TOYOTA hand-held tester:
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Check voltage between terminal STP of ECM and body ground.
OK:
Brake pedalVoltage
Depressed7.5 - 14 V
ReleasedBelow 1.5 V
OK Check for intermittent problems
(See page DI-147).
NG

DI4V4-01
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI-441
Check and Clear DTC (Precheck)
P. DI-442Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN-18
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI-442
Sensor CheckCircuit Inspection
P. DI-453 ~ DI-498
DTC Chart
P. DI-447 Malfunction codeProblem Symptoms Chart
P. DI-452
Check for Fluid Leakage
P. DI-498
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 2, 5, 8, 9, 11:Diagnostic steps permitting the use of the
TOYOTA hand-held tester or TOYOTA
break-out-box.
DI-440
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
668 Author
: Date
:
1997 SUPRA (RM502U)
ANTI-LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.

DI4V5-01
ABS Check Sheet
Inspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration Year Registration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
Remains ONDoes not Light Up
Symptomskm
miles
ABS does not operate.
ABS Warning Light
AbnormalABS does not operate efficiently.
Check ItemTRAC Indicator
LightNormalDoes not Light Up
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
1st Time
DTC Check
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-441
669 Author
: Date
:
1997 SUPRA (RM502U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI4V6-01
F02620
R06980
Short Pin
DLC1
S-17-1 Iei-23-1-A
F00041
DLC2
Tc E 1DLC1
Tc E1
R01346
Normal Code
2 sec.
ON
OFF0.25
sec.
0.25
sec.
Code 11 and 21
0.5
sec.
4 sec.1.5
sec.2.5 sec.0.5
sec.
Code 21
Code 11 ON
OFF DI-442
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
670 Author
: Date
:
1997 SUPRA (RM502U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the Indicator,
When the ignition switch is turned ON, check that the ABS
warning light goes on for 3 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the ABS warning light circuit (See page DI-488).
(b) Check the DTC.
(1) Turn the ignition switch ON.
(2) Disconnect the short pin from DLC1.
(3) Using SST, connect terminals Tc and E1 of DLC2 or
DLC1.
SST 09843-18020
(4) Read the DTC from the ABS warning light on the
combination meter.
HINT:
If no code appears, inspect the diagnostic circuit or ABS warn-
ing light circuit (See page DI-494 or DI-488).
As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(5) Codes are explained in the code table on page
DI-447.
(6) After completing the check, disconnect terminals Tc
and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.

FI6997
TOYOTA
Hand-held
tester
DLC2
BR3890
R06980
Short Pin
DLC1
N09348
TOYOTA hand-held tester
ECU
TOYOTA brake-out-box
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-443
671 Author
: Date
:
1997 SUPRA (RM502U)
(c) Using TOYOTA hand-held tester, check the DTC.
(1) Hook up the TOYOTA hand- held tester to the
DLC2.
(2) Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand-held tester oper-
ator 's manual for further details.
(d) Clear the DTC.
(1) Using SST, connect terminals Tc and E1 of DLC2 or
DLC1 and remove the short pin from DLC1.
SST 09843-18020
(2) IG switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 5 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of DLC2 or
DLC1.
SST 09843-18020
(6) Connect the short pin to DLC1.
HINT:
Disconnecting the battery cable during repairs will not erase the
DTC in the ECU.
(e) Using TOYOTA brake-out-box and TOYOTA hand-held
tester, measure the ECU terminal values.
(1) Turn the IG switch OFF.
(2) Hook up the TOYOTA hand-held tester and TOYO-
TA break-out-box to the vehicle.
(3) Turn the IG switch ON.
(4) Read the ECU input/output values by following the
prompts on the tester screen.
HINT:
TOYOTA hand-held tester has a ºSnapshotº function.
This records the measured values and is effective in the diagno-
sis of intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break-
out-box operator's manual for further details.