brake fluid TOYOTA SUPRA 1997 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1997, Model line: SUPRA, Model: TOYOTA SUPRA 1997Pages: 1807, PDF Size: 39.36 MB
Page 80 of 1807
IN04I-01
- INTRODUCTIONTERMS
IN-33
33 Author: Date:
1997 SUPRA (RM502U)
TERMS
ABBREVIATIONS USED IN THIS MANUAL
AbbreviationsMeaning
ABSAnti-Lock Brake System
ALRAutomatic Locking Retractor
APPROX.Approximately
A/T, ATMAutomatic Transmission
AT FAutomatic Transmission Fluid
BTDCBefore Top Dead Center
CBCircuit Breaker
CDCompact Disc
CRSChild Restraint System
DOHCDouble Over Head Cam
DPDash Pot
ECUElectronic Control Unit
ELREmergency Locking Retractor
ESAElectronic Spark Advance
EXExhaust (Manifold, Valve)
FIPGFormed in Place Gasket
FLFusible Link
FrFront
H-FuseHigh Current Fuse
IGIgnition
INIntake (Manifold, Valve)
J/BJunction Block
LEDLight Emitting Diode
LHLeft-Hand
LLCLong Life Coolant (Year Around Coolant)
LSDLimited Slip Differential
Max.Maximum
Min.Minimum
MPMultipurpose
M/TManual Transmission
O/D, ODOverdrive
O/SOversize
P&BVProportioning and Bypass Valve
PCVPositive Crankcase Ventilation
PPSProgressive Power Steering
PSPower Steering
RHRight-Hand
RrRear
SRSSupplemental Restraint System
SSMSpecial Service Materials
SSTSpecial Service Tools
STDStandard
Page 92 of 1807
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
Page 96 of 1807
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
Page 97 of 1807
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
Page 163 of 1807
- BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE-7
1985 Author: Date:
1997 SUPRA (RM502U)
WARNING LIGHTS:
SymptomSuspect AreaSee page
Warning lights do not light up.
(Except Discharge and Door Open)
1. Bulb
2. IGN Fuse (J/B No.1)
3. Ignition Switch
4. Meter Circuit
5. Generator
6. Wire Harness
BE-13
BE-40
Brake Warning Light does not light up.
1. Bulb
2. Brake Fluid Level Warning Switch
3. Parking Brake Switch
4. Bulb Check Relay
5. Meter Circuit
6. Wire Harness
BE-43
BE-43
BE-40
Seat Belt Warning Light does not light up.
1. Bulb
2. Seat Belt Buckle Switch
3. Integration Relay
4. Meter Circuit
5. Wire Harness
BE-43
BE-13
BE-40
Engine Oil Level Warning Light does not light up.
1. Bulb
2. Engine Oil Level Warning Switch
3. Meter Circuit
4. Wire Harness
BE-43
BE-40
Low Oil Pressure Warning Light does not light up.
1. Bulb
2. Low Oil Pressure Warning Switch
3. Meter Circuit
BE-43
BE-40
Door Open Warning Light does not light up.
1. Bulb
2. DOME Fuse (R/B No.2)
3. Door Courtesy Switch
4. Luggage Room Light Switch
5. Integration Relay
6. Meter Circuit
7. Wire Harness
BE-28
BE-28
BE-13
BE-40
Master Warning Light does not light up.
1. Bulb
2. Telltale Light Circuit
3. Meter Circuit
4. Wire Harness
BE-40
BE-40
INDICATOR LIGHTS:
SymptomSuspect AreaSee page
SRS Indicator Light does not light up.
1. Bulb
2. Center Airbag Sensor
3. Wire Harness
DI-555
ABS Indicator Light does not light up.
1. Bulb
2. Traction ECU
3. Wire Harness
DI-499
Malfunction Indicator Light does not light up.
1. Bulb
2. ECM
3. Wire Harness
DI-1
DI-145
TRAC OFF Indicator Light does not light up.
1. Bulb
2. Traction Solenoid Relay
3. Traction ECU
4. Wire Harness
DI-499
DI-499
Page 195 of 1807
Z18230
Brake Fluid Level Warning Switch
Parking Brake Switch
Telltale Light LH
Telltale Light RHVehicle Speed Sensor
Light Failure Sensor
DOME Fuse
Combination Meter
Door Courtesy Switches GAUGE Fuse
ECU-B Fuse
IGN Fuse
PANEL Fuse
TAIL Fuse Integration
Fuel Sender Gauge
: Engine Coolant Temperature Sensor
: Engine Oil Level Sensor
: Low Oil Pressure Warning Switch
: Park/Neutral Position Switch
: Vehicle Speed Sensor 2JZ-GE2JZ-GTE
1
5
4
3
2 Relay R/B No.2
J/B No.1
Meter Circuit
1
1
5 4
3
2 1
2
3
4
5
BE0E7-01
- BODY ELECTRICALCOMBINATION METER
BE-39
2017 Author: Date:
1997 SUPRA (RM502U)
COMBINATION METER
LOCATION
Page 197 of 1807
I02078
Cruise Control Indicator :Fuel Gauge
:Engine Coolant Temperature Gauge
:Tachometer
:Speedometer
D.R.L. :Daytime Running Light
* :Engine Oil Level Delay Circuit
F
E
T
S
F
E
T
S C8
A10
A11
A9
A8
A13
C11
C10
B13
B12
B2
A1
C7
C5
A14
A7
A6
A3
C1
C2
C13
A5P
R
N
D
2
LB4
B10
B6
B7
B8
B11
B1
C9
A16
C4
C6
A15
A2
B3
C12 Fuel Level Warning
MANU Indicator
O/D OFF Indicator
Brake Warning
Bulb Check Relay
TRAC Indicator
Right Turn Indicator
High Beam Indicator
Master Warning
Illumination
SNOW IndicatorLeft Turn Indicator
No. Wire Harness Side
Brake Fluid Level Warning Switch
Parking Brake Switch
USA:TAIL (RH) Fuse, PANEL Fuse
Headlight Dimmer Switch
ECT ECU
Cruise Control ECU
TRAC ECU
Ground (Engine)
Engine Coolant Temperature Sender Gauge
Fuel Sender Gauge
Ground (Signal)
Turn Signal Switch
Starter Relay Generator L Terminal Igniter
Park/Neutral Position Switch (A/T Vehicle) A1
2
3
5
6
7
8
9
10
11
13
14
15
16
BGAUGE Fuse
O/D OFF Switch
USA:TAIL (RH) Fuse, PANEL Fuse
Park/Neutral Position Switch (P)
Park/Neutral Position Switch (N)
ECT ECU
Ground (Power)
Park/Neutral Position Switch (D)
Park/Neutral Position Switch (2)
Park/Neutral Position Switch (L) Park/Neutral Position Switch (R) 1
2
3
6
7
8
10
11
124
13
Engine Oil Level Sensor
Turn Signal Switch
Ground (Power)
Fuel Sender Gauge
GAUGE Fuse
Vehicle Speed Sensor (Terminal 2)
Vehicle Speed Sensor (Terminal 3)
USA:TAIL (RH) Fuse, PANEL Fuse
Light Control Rheostat Telltail Light RH (Terminal 11)
Telltail Light LH (Terminal 1)
Telltail Light LH (Terminal 6) 1
2
6
7
8
10
11
124
135
9 CCANADA:D.R.L. No.3 Relay
Clutch Start Switch (M/T Vehicle)
CANADA:D.R.L. No.3 Relay
CANADA:D.R.L. No.3 Relay
- BODY ELECTRICALCOMBINATION METER
BE-41
2019 Author: Date:
1997 SUPRA (RM502U)
Page 204 of 1807
N08966
BE1217
Ignition
Switch
BatteryWarning Light
N09510
BE0044
Ignition
Switch
BatteryWarning Light BE-48
- BODY ELECTRICALCOMBINATION METER
2026 Author: Date:
1997 SUPRA (RM502U)
17. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
CONTINUITY
(a) Remove the reservoir tank cap and strainer.
(b) Disconnect the connector.
(c) Check that there is no continuity between terminals with
the switch OFF (float up).
(d) Use syphon, etc. to take fluid out of the reservoir tank.
(e) Check that there is continuity between terminals with the
switch ON (float down).
(f) Pour the fluid back in the reservoir tank.
If operation is not as specified, replace the switch.
18. INSPECT BRAKE FLUID LEVEL WARNING LIGHT
(a) Disconnect the connector from the brake fluid warning
switch.
(b) Release the parking brake pedal.
(c) Connect terminals on the wire harness side of the level
warning switch connector.
(d) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire har-
ness.
19. INSPECT PARKING BRAKE SWITCH CONTINUITY
(a) Check that there is continuity between terminal and
switch body with the switch ON (switch pin released).
(b) Check that there is no continuity between terminal and
switch body with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch or inspect
ground point.
20. INSPECT PARKING BRAKE WARNING LIGHT
(a) Disconnect the connector from the parking brake switch
and the brake fluid warning switch.
(b) Ground terminal on the wire harness side connector.
(c) Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or inspect wire
harness.
Page 322 of 1807
BR0GA-03
BR-2
- BRAKETROUBLESHOOTING
1802 Author: Date:
1997 SUPRA (RM502U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
Use the table below to help you find the cause of the problem. The numbers indicate the priority of the likely
cause of the problem. Check each part in order. If necessary, replace these parts.
SymptomSuspect AreaSee page
Lower pedal or spongy pedal
1. Brake system (Fluid leaks)
2. Brake system (Air in)
3. Piston seals (Worn or damaged)
4. Master cylinder (Faulty)
5. Booster push rod (Out of adjustment)-
BR-5
BR-28
BR-36
BR-48
BR-54
BR-10
BR-21
Brake drag
1. Brake pedal freeplay (Minimal)
2. Parking brake lever travel (Out of adjustment)
3. Parking brake wire (Sticking)
4. Parking brake shoe clearance (Out of adjustment)
5. Pad (Cracked or distorted)
6. Piston (Stuck)
7. Piston (Frozen)
8. Tension or return spring (Faulty)
9. Booster push rod (Out of adjustment)
10. Vacuum leaks for booster system
11. Master cylinder (Faulty)BR-7
BR-9
BR-64
BR-22
BR-25
BR-42
BR-45
BR-28
BR-36
BR-48
BR-54
BR-28
BR-36
BR-48
BR-54
BR-60
BR-21
BR-19
BR-10
Page 323 of 1807
- BRAKETROUBLESHOOTING
BR-3
1803 Author: Date:
1997 SUPRA (RM502U) Brake pull
1. Piston (Stuck)
2. Pad (Oily)
3. Piston (Frozen)
4. Disc (Scored)
5. Pad (Cracked or distorted)BR-28
BR-36
BR-48
BR-54
BR-22
BR-25
BR-42
BR-45
BR-28
BR-36
BR-48
BR-54
BR-28
BR-36
BR-48
BR-54
BR-22
BR-25
BR-42
BR-45
Hard pedal but brake inefficient
1. Brake system (Fluid leaks)
2. Brake system (Air in)
3. Piston (Stuck)
4. Pad (Cracked or distorted)
5. Pad (Oily)
6. Pad (Glazed)
7. Disc (Scored)
8. Booster push rod (Out of adjustment)
9. Vacuum leaks for booster system-
BR-5
BR-28
BR-36
BR-48
BR-54
BR-22
BR-25
BR-42
BR-45
BR-22
BR-25
BR-42
BR-45
BR-22
BR-25
BR-42
BR-45
BR-28
BR-36
BR-48
BR-54
BR-21
BR-19