TOYOTA SUPRA 1997 Service Owners Manual

29 SUPRAÐNEW FEATURES
 DRIVE SHAFT
The drive shaft outboard joint of the 2JZ±GE engine model has been changed from the cross±groove type CJV
(Constant±Velocity Joint) to the Rzeppa type CVJ.
As in the '96 model, the 2JZ±GTE engine model uses the drive shaft consisting of cross±groove type CVJs for both
the inboard and outboard joints.
 BRAKES
1. General
The size of the master cylinder for the 2JZ±GTE engine model has been increased to realize excellent brake feeling.
The ABS actuator has been changed from the conventional three±position solenoid valves to a combination of
compact two±position solenoid valves, thus achieving a compact and lightweight configuration.
3±channel type ABS with 4±speed sensor is used on the 2JZ±GE engine model.
4±channel type ABS with 4±speed sensors and linear type deceleration sensor is used on the 2JZ±GTE engine
model.

Specifications
Model
'97 Model '96 Model
Engine Type2JZ GE2JZ GTE2JZ GE2JZ GTEItem2JZ±GE2JZ±GTE2JZ±GE2JZ±GTE
MasterTypeTandemuuuMaster
CylinderDia. mm (in.)25.4 (1.00)26.9 (1.06)25.4 (1.00)u
ABS Type
3 Channel Type
ABS with
4±Speed Sensors
4 Channel Type
ABS with
4±Speed Sensors
and Linear Type
Deceleration Sensor4±Channel Type
ABS with 4±Speed
Sensor and Lateral
Acceleration Sensors
u
ABS Type Actuator
6 Two Position
Solenoid Valves8 Two Position
Solenoid Valves4 Three Position
Solenoid Valvesu

30SUPRAÐNEW FEATURES
2. ABS
General
The ABS (Anti±Lock Brake System) is designed to control the brake fluid pressure of the brake wheel cylinder to
help prevent wheel lock±up in instances of panic braking, and thus maintaining vehicle directional stability and
control.
System Diagram

31 SUPRAÐNEW FEATURES
Wiring Diagram

32SUPRAÐNEW FEATURES
Layout of Components
Construction and Operation
1) Deceleration Sensor
The 2JZ±GTE engine model uses a linear type deceleration sensor to detect the deceleration rate in the vehicle's
longitudinal direction and the acceleration rate in the vehicle's lateral direction.
Accordingly, the ABS in able to determine the vehicle's cornering condition and various road surface conditions to
achieve a finely cornering control.
The basic construction and operation are the same as those of the '97 RAV4 4WD 2±door model. For details, see '96
RAV4 New Car Features (Pub. No. NCF124U), page 70.
2) ABS Actuator
a. General
The ABS actuator consists of 6 or 8 two±position solenoid valves, 2 pumps, 2 reservoirs and a motor. The table below
compares the actuator against that of the '96 model.

Comparison of ABS Actuators
Model
'97 Model '96 Model
Engine Type2JZ GE2JZ GTE2JZ GE 2JZ GTEEngine Type2JZ±GE2JZ±GTE2JZ±GE, 2JZ±GTE
Actuator Type2±Position2±Position3±Position
ComponentSolenoid ValvesSolenoid ValvesSolenoid Valves
Control Unit
6 Two±Position
Solenoid Valves
(3 pressure holding
valves and
3 pressure
reduction valves)8 Two±Position
Solenoid Valves
(4 pressure holding
valves and
4 pressure
reduction valves)
4 Three±Position
Solenoid Valves

33 SUPRAÐNEW FEATURES
b. Hydraulic Circuit

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

35SUPRAÐNEW FEATURES
 Pressure Holding Mode
After the fluid pressure in the wheel cylinder is
reduced or increased to the required pressure, a
control signal from the ECU causes ports A and D to
close. As a result, the system engages in the pressure
holding mode to maintain the fluid pressure in the
wheel cylinder.

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

Hydraulic Circuit
 Pressure Increase Mode
When the fluid pressure in the wheel needs to be
increased in order to apply more braking force, a
control signal from the ECU causes port A to open,
port D to close, thus engaging the increase mode.
Accordingly, the circuit will be in the same state as in
normal braking, in which the brake fluid is sent from
the master cylinder to the wheel cylinder to increase
the fluid pressure in the wheel cylinder.
The fluid pressure increase rate is controlled by
repetition of the pressure increase and pressure
holding mode.

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

Hydraulic Circuit

36SUPRAÐNEW FEATURES
3) ABS ECU
a. Wheel Speed Control
The ECU constantly receives signals form the 4±speed sensors and a deceleration sensor (2JZ±GTE engine model),
and estimates the speed and deceleration rate of the vehicle by calculating the speed and deceleration rate of each
wheel.
b. Initial Check
An initial check is carried out every time once after the engine has started and the initial vehicle speed exceeds 6 km/h
(4 mph).
c. Self±Diagnosis
If the ABS ECU detects a malfunction in the ABS, the ABS warning light and a master warning lights in the
combination meter will light up and alert the driver that a malfunction has occurred. The ECU will also store the codes
of the malfunctions.
 SUSPENSION
1. General
The shock absorber of the 2JZ±GTE engine model with manual transmission has been changed from the
mono±tube, gas±filled shock absorber to the twin±tube, gas±filled shock absorber, which is the same type that is
used on the 2JZ±GE engine model.
The same rubber±integrated ball bushing that is used on the 2JZ±GTE engine model is used for the upper arm
bushing of the rear suspension of the 2JZ±GE engine model.
The brace rod of the rear subframe has been relocated to realize excellent riding comfort, in addition, this provides
excellent stability, an controllability.

FOREWORD
To assist you in your service activities, this manual explains the main characteristics of the 1997 model year
vehicles, in particular providing a technical explanation of the construction and operation of new mechanisms
and new technology used.
This manual consists of the following sections.
1.
~ 11. Each Model ÐChanged features for each model are explained.
12. Appendix ÐMajor technical specifications of the vehicle.
CAUTION, NOTICE, REFERENCE and NOTE are used the following ways:
CAUTIONA potentially hazardous situation which could result in injury to people may occur if
instructions on what to do or not do are ignored.
NOTICEDamage to the vehicle or components may occur if instructions on what to do or not
do are ignored.
REFERENCEExplains the theory behind mechanisms and techniques.
NOTENotes or comments not included under the above 3 titles.
For the new features of the Camry, refer to the following New Car Features.
Manual Name
Pub. No.Date of issue
 1997 Camry New Car FeaturesNCF134UJuly, 1997
All information contained herein is the most up±to±date at the time of publication. We reserve the right to make
changes without prior notice.
TOYOTA MOTOR CORPORATION

1996 TOYOTA MOTOR CORPORATION
All rights reserved. This book may not be reproduced or
copied, in whole or in part, without the written
permission of Toyota Motor Corporation.

24
:New :Discontinued SUPRAÐMODEL CODE & MODEL LINE±UP
MODEL CODE
JZA80 L ± A J M V F A



BASIC MODEL CODE
JZA80 : With 2JZ±GE Engine or
2JZ±GTE Engine
STEERING WHEEL POSITIONL : Left±Hand Drive
MODEL NAMEA : Supra
BODY TYPE
L : Liftback
J : Liftback with Sport Roof
GEARSHIFT TYPE
F : 6±Speed Manual, Floor
M : 5±Speed Manual, Floor
P : 4±Speed Automatic, Floor
GRADEV : Ð
ENGINE SPECIFICATION
F : SFI and DOHC
Z : SFI and DOHC with Turbocharger
DESTINATION
A : U.S.A..
K : Canada
MODEL LINE±UP
TRANSAXLE5±Speed
Manual6±Speed
Manual 4±Speed Automatic
DESTI±ROOFGRADEENGINEW58V160A340EA340E*NATIONROOFGRADEENGINEW58V160A340EA340E*
Standard
2JZ GE
JZA80L±
ALMVFAJZA80L±
ALPVFA
USA
SportÐ
2JZ±GEJZA80L±
AJMVFAJZA80L±
AJPVFA
U.S.A..
Standard
2JZ±GTE
JZA80L±
ALFVZAJZA80L±
ALPVZA
Sport
2JZ±GTEJZA80L±
AJFVZAJZA80L±
AJPVZA
CanadaSportÐ2JZ±GTEJZA80L±
AJFVZKJZA80L±
AJPVZK
* : Electronically Controlled Transmission with and intelligent sporty control