TOYOTA SUPRA 1997 Service Repair Manual

DI-466
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
694 Author
: Date
:
1997 SUPRA (RM502U)
DTC 21, 22, 23, 24 ABS Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the fluid pressure acting on the
brake cylinders, thus controlling the braking force.
DTC No.DTC Detecting ConditionTrouble Area
21
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SFR is 0 V or battery positive voltage.

ABS actuator

Open or short in SFR circuit
22
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SFL is 0 V or battery positive voltage.

ABS actuator

Open or short in SFL circuit
23
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SRH (SRRH) or SRR (SRRR) is 0 V or battery positive volt-
age.

ABS actuator

Open or short in SRH (SRRH) or SRR (SRRR) circuit
24*
Conditions (1) through (3) continue for 0.05 sec. or more:
(1) ABS solenoid relay terminal (SR) voltage:
Below 1.5V
(2) Voltage of ABS ECU terminal AST:
Battery positive voltage
(3) When power transistor of ECU is ON, voltage of terminal
SRLH or SRLR is 0 V or battery positive voltage.

ABS actuator

Open or short in SRLH or SRLR circuit
Fail safe function:
If trouble occurs in the ABS actuator solenoid circuit, the ECU cuts off current to the ABS solenoid relay and
prohibits ABS control.
*: SPORT ABS (2JZ-GTE Engine) only
DI4VD-01

F03320F03321F03322
R/B
No.2
Battery
B
W-B
EA
A6
A7
A6 A9 A9 A8
A19
2A 1
ALT
12
2ABS No.1
2RR1
2
6
DLC1
L-WABS ECU
A19
A19
IB6 Y-GABS ECU
4
R/B
No.2
ABS No.1
1
12 2
BatteryR/B No.2
5
12
4
IB5
A21A20
A6
EA
2JZ-GE Engine (NORMAL ABS):
2
11
ABS ECU 6
IB6
A21
RABS Control Relay
Motor
Relay
A7A7 A7 A7A7
A19
A19
A19
A19
IB5 IB5IB5
IB5 IB5 IB5
ABS Actuator
A9
Solenoid
Relay
5
ABS Pump
Motor
P P-LY Y-R B-Y B-R
Y-GP P-LY Y-R B-Y B-R
5
1
5 6
2
8
7
5 58
7
9 4
31
4 11
10
22
21
16SFLRMonitor
SFLH
SFRR
SFRH
SRR
SRH
AST
5
5
5 35
5
5ABS ECU R 2JZ-GTE Engine (SPORT ABS):
W-B
A64 L-W
ALT
2A
B
ABS ActuatorMonitor
A20
A21
A21
A20
A20
A21
IB5
IB5
IB5
IB5
IB5
IB5
IB5 YY
Y-R Y-R
B-Y
B-Y
B-R
B-R
P
P
P-L
P-L
P-B
P-B
R-L
R-L
Y-GY-G
A7
A7
A7
A7
A7
A7
A7
A7
1DLC1
1
1
5
55
55 22
6
66
44
4 88
33
77
9
1011
12
15
14 ABS Solenoid
Relay
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
AST
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-467
695 Author
: Date
:
1997 SUPRA (RM502U)
WIRING DIAGRAM

F03323
123
4
56
7
8
4
A6A6
DI-468
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
696 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
CHECK:
NORMAL ABS (2JZ-GE Engine):
Check continuity between terminal A6 - 4 and A7 - 1, 2, 5, 6,
7, 8 of ABS actuator connector.
SPORT ABS (2JZ-GTE Engine):
Check continuity between terminal A6 - 4 and A7 - 1, 2, 3, 4,
5, 6, 7, 8 of ABS actuator connector.
OK:
Continuity
HINT:
Resistance of each of the solenoids SFRH, SFLH, SRRH and
SRLH is 5.0 W.
Resistance of each of the solenoids SFRR, SFLR, SRRR and
SRLR is 2.2 W.
NG Replace ABS actuator.
OK
2 Check for open and short in harness and connector between ABS ECU and ac-
tuator (See page IN-28).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.

DI-460
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
688 Author
: Date
:
1997 SUPRA (RM502U)
DTC 13, 14 ABS Motor Relay Circuit
CIRCUIT DESCRIPTION
This ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the motor relay ON and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
Conditions (1) and (2) continue for 0.2 sec. or more:
(1) ABS motor relay terminal (MR)
voltage: Below 1.5V
(2) Motor relay monitor terminal (MT)
voltage: 0 V

ABS motor relay

Open or short in ABS motor relay circuit
14
Conditions (1) and (2) continue for 4 sec. or more:
(1) ABS motor relay terminal (MR)
voltage: Battery positive voltage
(2) Motor relay monitor terminal (MT)
voltage: Battery positive voltage

ABS motor relay

B+ short in ABS motor relay circuit
Fail safe function:
If trouble occurs in the ABS motor relay circuit, the ECU cuts off the current to the ABS solenoid relay and
prohibits ABS control.
DI4VC-01

F02626F02643
F02644
R/B
No.2
Battery
B
W-BW-BW-B
EAA6A6 A6
A6
A6 A9 A8 A9 A9A8 A8
A8
A9
IB6
IB6
IB6A19
A19
A19
2A 1
ALT
1 2
2ABS No.1
2RR1
2
6ABS Control Relay
4
3
1 Solenoid
Relay
DLC1 L-BL-B V-W V-WV
V7
8
18ABS ECU
MR
R+
SR
AST
MT 16
9
A19
A19Y-G
G-W 2
13
1
6 5
IB6
IB6 Y-G
G-W 5
3
ABS ActuatorABS ECU 5
4 2
2
L
L-W
Motor
Relay
R/B
No.2
ABS No.1
ALT
1
1
22
Battery
B
R/B No.5
55
5 1
23 4
V-W V-WIB6
IB6 6
2
13
A21
A20
26
A6 A6
ABS Pump MotorEA
MR
R+ 2JZ-GE Engine (NORMAL ABS):
2JZ-GTE Engine (SPORT ABS):
R
5
2
L W-B
A6
131ABS ECU
G-W
G-W 6
IB6
A21
10
MT ABS Motor Relay
V
V R
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-461
689 Author
: Date
:
1997 SUPRA (RM502U)
WIRING DIAGRAM

F02629F02645F02646
LOCK
A8
W02801
ABS Solenoid
Relay
ABS
Actuator
ECUA8
A6A6
A6A6
A193
9
22
2
DI-462
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
690 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GE Engine)
1 Check voltage between terminal A8 - 1 of ABS control (motor) relay connector
and body ground.
PREPARATION:
Disconnect the ABS control (motor) relay connector.
CHECK:
Measure voltage between terminal A8 - 1 of ABS control (mo-
tor) relay connector and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminal A8 - 2 of ABS control (motor) relay connector
and terminal A19 - 9 of ABS ECU.
CHECK:
Check continuity between terminal A8 - 2 of ABS control (mo-
tor) relay connector and terminal A19 - 9 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26 ~ 40 W between terminals A6 - 2 and
A6 - 3 of ABS actuator.
NG Repair or replace harness or ABS actuator.
OK

F02648
Open
Continuity
Continuity
A8 A8
A9
A9
1
3
42
1
3
42
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-463
691 Author
: Date
:
1997 SUPRA (RM502U)
3 Check ABS control (motor) relay.
CHECK:
Check continuity between each terminal of ABS control (motor)
relay.
OK:
Terminals A8 - 3 and A8 - 4Continuity (Reference value 62 W)
Terminals A8 - 1 and A8 - 2Open
CHECK:
(a) Apply battery voltage between terminals A8 - 3 and A8
- 4.
(b) Check continuity between terminals of ABS control (mo-
tor) relay.
OK:
Terminals A8 - 1 and A8 - 2Continuity
NG Replace ABS control relay.
OK
4 Check for open and short in harness and connector between ABS motor relay
and ABS ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.

F02629F02649F02650
LOCK
R/B No.5
(+) (-)
F03315
ABS Solenoid
Relay
ABS
Actuator
ECUA6
A6
A6A6
A21
2
22
3
10
DI-464
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
692 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE (2JZ-GTE Engine)
1 Check voltage between terminal 1 of R/B No.5 (for ABS motor relay) and body
ground.
PREPARATION:
Remove ABS motor relay from R/B No.5.
CHECK:
Measure voltage between terminal 1 of R/B No.5 (for ABS mo-
tor relay) and body ground.
OK:
Voltage: 10 - 14 V
NG Check and repair harness or connector.
OK
2 Check continuity between terminal 2 of R/B No.5 (for ABS motor relay) and termi-
nal A21 - 10 of ABS ECU.
CHECK:
Check continuity between terminal 2 of R/B No.5 (for ABS mo-
tor relay) and terminal A21 - 10 of ABS ECU.
OK:
Continuity
HINT:
There is a resistance of 26 ~ 40 W between terminals A6 - 2 and
A6 - 3 of ABS actuator.
NG Repair or replace harness or ABS actuator.
OK

F03316F03317F03318F03319
1 2
3 4
Open
Continuity
Continuity
(-)
(+)
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-465
693 Author
: Date
:
1997 SUPRA (RM502U)
3 Check ABS motor relay.
PREPARATION:
Remove motor relay from R/B No.5.
CHECK:
Check continuity between each terminal of motor relay.
OK:
Terminals 3 and 4Continuity (Reference value 62 W)
Terminals 1 and 2Open
CHECK:
(a) Apply battery voltage between terminals 3 and 4.
(b) Check continuity between terminals.
OK:
Terminals 1 and 2Continuity
NG Replace ABS motor relay.
OK
4 Check for open and short in harness and connector between ABS motor relay
and ABS ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.

BR3583
BR3582F00010
RotorSpeed Sensor
CoilNSMagnet
To ECU
Low Speed
High Speed
+V
-V
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-469
697 Author
: Date
:
1997 SUPRA (RM502U)
DTC 31, 32, 33, 34 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS control system. The front and rear rotors each have 48
serrations.
When the rotos rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.DTC Detecting ConditionTrouble Area
31,32,33,34
Detection of any of conditions (1) through (3):
(1) At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec.
(2) Momentary interruption of the vehicle speed sensor signal
occurs at least 7 times in the time between switching the igni-
tion switch ON and switching it OFF.
(3) Abnormal fluctuation of speed sensor signals with the ve-
hicle speed 20 km/h (12 mph) or more.

Right front, left front, right rear and left rear speed sensor

Open or short in each speed sensor circuit

Sensor rotor
HINT:
DTC No.31 is for the right front speed sensor.
DTC No.32 is for the left front speed sensor.
DTC No.33 is for the right rear speed sensor.
DTC No.34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
DI4VE-01