TOYOTA SUPRA 1997 Service Manual Online

IN-34
- INTRODUCTIONTERMS
34 Author
: Date
:
1997 SUPRA (RM502U) SW
Switch
TDCTop Dead center
TEMP.Temperature
TRACTraction Control System
U/SUndersize
VCVVacuum Control Valve
VSVVacuum Switching Valve
VTVVacuum Transmitting Valve
w/With
w/oWithout

IN04J-01
- INTRODUCTIONTERMS
IN-35
35 Author
: Date
:
1997 SUPRA (RM502U)
GLOSSARY OF SAE AND TOYOTA TERMS
This glossary lists all SAE-J1930 terms and abbreviations used in this manual in compliance with SAE rec-
ommendations, as well as their Toyota equivalents.
SAE
ABBREVIATIONSSAE TERMSTOYOTA TERMS
( )--ABBREVIATIONS
A/CAir ConditioningAir Conditioner
ACLAir CleanerAir Cleaner
AIRSecondary Air InjectionAir Injection (AI)
APAccelerator Pedal-
B+Battery Positive Voltage+B, Battery Voltage
BAROBarometric Pressure-
CACCharge Air CoolerIntercooler
CARBCarburetorCarburetor
CFIContinuous Fuel Injection-
CKPCrankshaft PositionCrank Angle
CLClosed LoopClosed Loop
CMPCamshaft PositionCam Angle
CPPClutch Pedal Position-
CTOXContinuous Trap Oxidizer-
CTPClosed Throttle Position-
DFIDirect Fuel Injection (Diesel)Direct Injection (DI)
DIDistributor Ignition-
DLC1
DLC2
DLC3Data Link Connector 1
Data Link Connector 2
Data Link Connector 31: Check Connector
2: Total Diagnosis Comunication Link (TDCL)
3: OBD II Diagnostic Connector
DTCDiagnostic Trouble CodeDiagnostic Code
DTMDiagnostic Test Mode-
ECLEngine Control Level-
ECMEngine Control ModuleEngine ECU (Electronic Control Unit)
ECTEngine Coolant TemperatureCoolant Temperature, Water Temperature (THW)
EEPROMElectrically Erasable Programmable Read Only Memory
Electrically Erasable Programmable Read Only Memory
(EEPROM),
Erasable Programmable Read Only Memory (EPROM)
EFEEarly Fuel EvaporationCold Mixture Heater (CMH), Heat Control Valve (HCV)
EGRExhaust Gas RecirculationExhaust Gas Recirculation (EGR)
EIElectronic IgnitionDistributorless Ignition (DI)
EMEngine ModificationEngine Modification (EM)
EPROMErasable Programmable Read Only MemoryProgrammable Read Only Memory (PROM)
EVAPEvaporative EmissionEvaporative Emission Control (EVAP)
FCFan Control-
FEEPROMFlash Electrically Erasable Programmable
Read Only Memory-
FEPROMFlash Erasable Programmable Read Only Memory-
FFFlexible Fuel-
FPFuel PumpFuel Pump
GENGeneratorAlternator
GNDGroundGround (GND)

IN-36
- INTRODUCTIONTERMS
36 Author
: Date
:
1997 SUPRA (RM502U) HO2S
Heated Oxygen SensorHeated Oxygen Sensor (HO2S)
IACIdle Air ControlIdle Speed Control (ISC)
IATIntake Air TemperatureIntake or Inlet Air Temperature
ICMIgnition Control Module-
IFIIndirect Fuel InjectionIndirect Injection
IFSInertia Fuel-Shutoff-
ISCIdle Speed Control-
KSKnock SensorKnock Sensor
MAFMass Air FlowAir Flow Meter
MAPManifold Absolute PressureManifold Pressure
Intake Vacuum
MCMixture Control
Electric Bleed Air Control Valve (EBCV)
Mixture Control Valve (MCV)
Electric Air Control Valve (EACV)
MDPManifold Differential Pressure-
MFIMultiport Fuel InjectionElectronic Fuel Injection (EFI)
MILMalfunction Indicator LampCheck Engine Light
MSTManifold Surface Temperature-
MVZManifold Vacuum Zone-
NVRAMNon-V olatile Random Access Memory-
O2SOxygen SensorOxygen Sensor, O2 Sensor (O2S)
OBDOn-Board DiagnosticOn-Board Diagnostic (OBD)
OCOxidation Catalytic ConverterOxidation Catalyst Converter (OC), CCo
OPOpen LoopOpen Loop
PAIRPulsed Secondary Air InjectionAir Suction (AS)
PCMPowertrain Control Module-
PNPPark/Neutral Position-
PROMProgrammable Read Only Memory-
PSPPower Steering Pressure-
PTOXPeriodic Trap OxidizerDiesel Particulate Filter (DPF)
Diesel Particulate Trap (DPT)
RAMRandom Access MemoryRandom Access Memory (RAM)
RMRelay Module-
ROMRead Only MemoryRead Only Memory (ROM)
RPMEngine SpeedEngine Speed
SCSuperchargerSupercharger
SCBSupercharger Bypass-
SFISequential Multiport Fuel InjectionElectronic Fuel Injection (EFI), Sequential Injection
SPLSmoke Puff Limiter-
SRIService Reminder Indicator-
SRTSystem Readiness Test-
STScan Tool-
TBThrottle BodyThrottle Body
TBIThrottle Body Fuel InjectionSingle Point Injection
Central Fuel Injection (Ci)
TCTurbochargerTurbocharger
TCCTorque Converter ClutchTorque Converter

- INTRODUCTIONTERMS
IN-37
37 Author
: Date
:
1997 SUPRA (RM502U) TCM
Transmission Control ModuleTransmission ECU (Electronic Control Unit)
TPThrottle PositionThrottle Position
TRTransmission Range-
TVVThermal Vacuum ValveBimetallic Vacuum Switching Valve (BVSV)
Thermostatic Vacuum Switching Valve (TVSV)
TWCThree-W ay Catalytic ConverterThree-W ay Catalytic (TWC)
CC
RO
TWC+OCThree-W ay + Oxidation Catalytic ConverterCCR + CCo
VA FVolume Air FlowAir Flow Meter
VRVoltage RegulatorVoltage Regulator
VSSVehicle Speed SensorVehicle Speed Sensor (Read Switch Type)
WOTWide Open ThrottleFull Throttle
WU-OCWarm Up Oxidation Catalytic Converter-
WU-TWCWarm Up Three-Way Catalytic ConverterManifold Converter
3GRThird Gear-
4GRFourth Gear-

37 SUPRAÐNEW FEATURES

BODY
1. Impact Absorbing Structure
Reinforcement to the bottom of the front pillar, reinforcements and gussets to the bottom of the center pillar, and
gussets connecting the lower part of the center pillar and the center floor cross members, have been newly adopted
to realize and even excellent body rigidity.
An energy absorbing pads are provided at the upper shoulder and lower arm areas of the door trim to ensure a high
level of energy absorbent for side collisions.

38SUPRAÐNEW FEATURES
2. Sound Absorbing Materials
Seal material has been newly provided to the bottom of the front pillar, and a quarter service hole cover has been
newly provided to the quarter portion in order to reduce road noise while driving.
The material of sound absorbing material used in the roof side inner garnish, quarter trim, deck side trim and deck
rear trim has been changed to reduce road noise.

CRUISE CONTROL SYSTEM
1. Actuator
The '97 Supra has adopted a new motor type actuator that is both lightweight and simple in construction.
The basic construction and operation of this actuator are the same as in the '96 4Runner with 5VZ±FE engine.
For details, see the 1996 4Runner New Car Features (Pub. No. NCF126U), page 71.
2. Cruise Control ECU
Manual Cancel Function
The manual cancel function, which cancels the cruise control when the parking brake is operated, has been
discontinued.

38SUPRAÐNEW FEATURES
3. Sound Absorbing Materials
Seal material has been newly provided to the bottom of the front pillar, and a quarter service hole cover has been
newly provided to the quarter portion in order to reduce road noise while driving.
The material of sound absorbing material used in the roof side inner garnish, quarter trim, deck side trim and deck
rear trim has been changed to reduce road noise.

CRUISE CONTROL SYSTEM
1. Actuator
The '97 Supra has adopted a new motor type actuator that is both lightweight and simple in construction.
The basic construction and operation of this actuator are the same as in the '96 4Runner with 5VZ±FE engine.
For details, see the 1996 4Runner New Car Features (Pub. No. NCF126U), page 71.
2. Cruise Control ECU
Manual Cancel Function
The manual cancel function, which cancels the cruise control when the parking brake is operated, has been
discontinued.

26SUPRAÐNEW FEATURES
 DIFFERENTIAL
1. General
A differential gear ratio has been changed on the 2JZ±GE engine model.
A Helical gear type torque±sensing LSD (Limited Slip Differential) is available as an option on the SJZ±GE engine
model and 2JZ±GTE engine with automatic transmission model.
As in the '96 model, a worm gear type torque±sensing LSD is used on the model with the SJZ±GTE engine and
manual transmission.

Specifications
Model
'97 Model '96 Model
Engine Type2JZ±GE2JZ±GTE2JZ±GE2JZ±GTE
Transmission TypeManualAutomaticManualAutomaticManualAutomaticManualAutomaticItemManualAutomaticManualAutomaticManualAutomaticManualAutomatic
Differential Gear Ratio 4.803u3.1333.7694.272u3.1333.769
No. ofDrive Pinion12u151311u1513No. of
TeethRing Gear49u474947u4749
Ring Gear Size
mm (in.)205
(8.07)
u222
(8.74)205
(8.07)uu222
(8.74)205
(8.07)
No. of Differential
Pinion 2,8*1,
3u6*2 2,8*1,
3 2,6*2,
3u6*2u
*1 : Models with Helical Gear Type Torque±Sensing LSD
*
2 : Models with Worm Gear Type Torque±Sensing LSD
*
3 : Option
2. Helical Gear Type Torque±Sensing LSD
Characteristics
Good traction of high bias ratio design is obtained through the utilization of two types of friction: One is the friction
that is generated between the planet gear's tooth tips and the differential case's inner wall. The other is the friction
that is generated between the side gear end face and the thrust washer.
Quick response and minimum time lag until differential limiting force is generated.
The bias ratio sustains minimal changes due to aging and maintains a stable performance.
A simple, compact, and lightweight differential configuration has been achieved through the use of the helical gear.
Ordinary differential oil must be used; do not use special LSD oil.

27 SUPRAÐNEW FEATURES
Construction
The helical gear type torque±sensing LSD consists of a differential case, 9 planet gears, 2 side gears and 4 thrust
washers.
Planet gears mesh with one another as a pair, and each gear of the pair meshes with the side gear on its right or left
side.
The planet gears are supported by the hole that is provided in the differential case. They are constructed so that they
revolve while rotating over the side gear.
Operation
1) Straight±Ahead Operation
Since side gears (left and right) and planet gears are rotating together with the differential case as a unit when the
vehicle is running straight±forward, the driving force is transmitted from the ring gear to the differential case, planet
gears and side gears.

28SUPRAÐNEW FEATURES
2) Cornering
Supposing that the differential case is not moving, rotating the left side gear counterclockwise, causes planet gear
A (which meshes with the left side gear) to rotate clockwise.
Furthermore, planet gear B, which is paired with planet gear A, rotates counterclockwise, causing the right side gear
(which meshes with planet gear B) to rotate clockwise.
Therefore the left and right side gears rotate in the opposite direction each other, thus accomplishing a motion
differential.
3) Limited Slip Differential Operation
Limited slip is accomplished primarily b the friction that is generated between the planet gear's tooth tips and the
differential case's inner wall, and the friction that is generated between the side gear end face and the thrust washer.
The principle of limited slip enables the resultant reaction force F1 (which is created by the meshing reaction of the
planet gear and the side gear and the meshing reaction of the planet gears themselves) to push the planet gear in the
direction of the differential case in proportion to the input torque.
Due to the reaction force F1, the friction force u F2 (which is generated between the side gear end face and the thrust
washer) applies a force to cancel out the rotational difference between the side gears themselves as well as between
the side gear and the differential case.