1997 TOYOTA SUPRA brake

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

W02989
IB5
IB5
IB2
IB2
IC2
IC2A19 A21
8 Right Front
Speed Sensor2
1L R
EA3
14 9
198
2 20
110
723
322
109FR+
FR-ABS ECU
5V
FL+
FL-
RR+
RR-
RL+
RL- R
L
W
B
V
LG 1
2
4
5
L
P
3 W
B
V
LG 2
2
2 1
1
1 Left Front
Speed Sensor
Right Rear
Speed Sensor
Left Rear
Speed Sensor
*1
3
*2
A19A21
A19
A21
A19
A21
A18
A20
A18
A20
A18
A20
A18
A20 DI-470
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
698 Author
: Date
:
1997 SUPRA (RM502U)
WIRING DIAGRAM
*1: NORMAL ABS (2JZ-GE Engine)
*2: SPORT ABS (2JZ-GTE Engine)

F02629F03325F03327
LOCK
21
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-471
699 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
(a) Remove front fender splash shield.
(b) Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.6 - 2.5 kW
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MW or higher
CHECK:
Check the sensor connector.
OK:
(1) There is not play on the connector connecting
part.
(2) Connectors are connected each other securely.

F02629F03326F03328
LOCK
1
2
DI-472
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
700 Author
: Date
:
1997 SUPRA (RM502U)
Rear
PREPARATION:
(a) Remove rear, seat cushion, seat back and quarter trim
panel.
(b) Disconnect speed sensor connector.
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:
Resistance: 0.65 - 1.8 kW
CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector and body ground.
OK:
Resistance: 1 MW or higher
CHECK:
Check the sensor connector.
OK:
(1) There is not play on the connector connecting
part.
(2) Connectors are connected each other securely.
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI-442).
OK
2 Check for open and short in harness and connector between each speed sensor
and ABS ECU (See page IN-28).
NG Repair or replace harness or connector.
OK

F03329
R00948
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-473
701 Author
: Date
:
1997 SUPRA (RM502U)
3 Check sensor rotor and sensor installation.
Front
PREPARATION:
Remove front speed sensor rotor (See page SA-12).
CHECK:
Check sensor rotor serrations.
OK:
No scratches, missing teeth or foreign objects.
CHECK:
Check the front speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between sensor and steering knuckle.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
Rear
PREPARATION:
Remove the drive shaft (See page SA-43).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth.

BR3795OK
NG
DI-474
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
702 Author
: Date
:
1997 SUPRA (RM502U)
CHECK:
Check the rear speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and rear axle carri-
er.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
NG Replace speed sensor and grease or rotor and
grease.
NOTICE:
Check the speed sensor signal last (See page DI-442).
OK
Check and replace ABS ECU.

F03330
Battery
B
R/B No.2
ALT
2222AM1 R/B No.2
WR/B No.1
W
2
IG Switch
J/B No.1ABS ECU
IG1
GND1
GND2 ECU IG
444
513 B-Y
1B1J1J 1K A18A20
213*1
*2
A20
A20 A19
A19212
13 25W-B
W-B W-B W-B
IG
IEW-B
*2
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)*1:
*2:
W
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-475
703 Author
: Date
:
1997 SUPRA (RM502U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU, hence the CPU and the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41Voltage at ECU terminal IG1 is less than 9.5 V for more than
10 sec. while vehicle speed is 3 km/h (1.9 mph) or more.
Battery

IC regulator

Open or short in power source circuit
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
WIRING DIAGRAM
DI4VF-01