1997 TOYOTA SUPRA lock

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

F02629F03331F03332F03333
ON
NORMAL ABS
(2JZ-GE Enegine):
SPORT ABS
(2JZ-GTE Enegine):IG1GND
GND
IG1 (+)
(-)
(+)
(-)
DI-476
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
704 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair the charging system.
OK
2 Check voltage between terminals IG1 and GND of ABS ECU connector.
PREPARATION:
Remove ABS ECU with connectors still connected.
CHECK:
(a) Turn ignition switch ON.
(b) Measure voltage between terminals IG1 and GND of ABS
ECU connector.
OK:
Voltage: 10 - 14 V
OK Check and replace ABS ECU.
NG

F02629F03334F03335F03336
NORMAL ABS (2JZ-GE Engine):
SPORT ABS (2JZ-GTE Engine):
LOCK
GND
(+)
(-)
(+)
(-)GND
GND
GND
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-477
705 Author
: Date
:
1997 SUPRA (RM502U)
3 Check continuity between terminal GND of ABS ECU connector and body
ground.
CHECK:
Measure resistance between terminals GND of ABS ECU con-
nector and body ground.
OK:
Resistance: 1 W or less
NG Repair or replace harness or connector.
OK

F03337
ECU IG J/B No.1
DI-478
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
706 Author
: Date
:
1997 SUPRA (RM502U)
4 Check ECU-IG fuse.
PREPARATION:
Remove ECU-IG fuse from J/B No.1.
CHECK:
Check continuity of ECU-IG fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to ECU-IG fuse
(See attached wiring diagram).
OK
Check for open in harness and connector be-
tween ABS ECU and battery
(See page IN-28).

- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-479
707 Author
: Date
:
1997 SUPRA (RM502U)
DTC 43, 45 Malfunction is Deceleration Sensor
(SPORT ABS (2JZ-GTE Engine) only)
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of the following (1) or (2) is detected:
(1) Input from the deceleration sensor does not change at one
cycle (0 km/h " more than 30km/h " 0 km/h) for 16 times
continuously.
(2) When the brake pedal is not depressed at vehicle speed of
5 km/h or more, forward and backward G (more than 0.4 G) is
detected for 30 seconds or more.

Deceleration sensor

Wire harness for deceleration sensor system
45
At vehicle speed of 30 km/h or more, the deceleration sensor
output and vehicle acceleration from wheel speed remain ab-
normally different for 60 seconds or more.
Deceleration sensor

Wire harness for deceleration sensor system
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI-442).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ABS ECU
(See page IN-28).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI4VG-01

F03338
Deceleration sensor
3
5
1
2
A23
A23
A23
A23B
W-B
W
R
G
W-B
IG IEA20
A20
A20
A20
3
16
4
17VGS
GL2
GL1
GGNDABS ECU DI-480
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
708 Author
: Date
:
1997 SUPRA (RM502U)
DTC 44 Deceleration Sensor Circuit
(SPORT ABS (2JZ-GTE Engine) only)
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.DTC Detecting ConditionTrouble Area
44
Either of the following (1), (2) or (3) is detected:
(1) IG switch ON and output voltage of GL1 or GL2 remains
0.5 V or less or 4.5 V or more for more than 1.2 sec.
(2) At vehicle speed of 0 km/h, outputs of GL1 and GL2 re-
mains abnormally different for 60 sec. or more
(3) IG switch ON and VGS
4.4 V, VGS  5.5 V continues
for 1.2 sec. or more.

Deceleration sensor

Open or short in deceleration sensor circuit
WIRING DIAGRAM
DI4VH-01

F02629F03339F03340
ON
GL1VGS
GL2 (+)
(-)
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-481
709 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between sensor and ABS
ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
2 Check voltage between terminals GL1, GL2, VGS of ECU and body ground.
PREPARATION:
(a) Remove ABS ECU with connectors still connected.
(b) Disconnect sensor connector.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals GL1, GL2, VGS of ECU
and body ground.
OK:
Voltage:
GL1, GL2: 0.5 - 4.5 V
VGS: 4.5 - 5.5 V
NG Check and replace ABS ECU.
OK
Check and replace deceleration sensor.