1995 TOYOTA SUPRA warning light

DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the diagnostic trouble code check, check the circuit listed for that
code in the table below and proceed to the relevant page.
HINT: Using SST 09843±18020, connect the terminals Tc and E
1, and remove the short pin.
BR±65
BR±65
BR±71
BR±71
BR±77
BR±77
BR±80
BR±80
BR±83
BR±83
BR±83
BR±83
BR±86
BR±86
BR±88
BR±88
BR±88
BR±88
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF*
OFF*
CodeABS Warning Light
Blinking PatternIndicator
DiagnosisSee pageABS
Warning
LightTRAC
OFF
LightTRAC
Indicator
Light
Open or short in ABS solenoid relay circuit
B+ short in ABS solenoid relay circuit
Open or short in ABS motor relay circuit
B+ short in ABS motor relay circuit
Open or short in TRAC solenoid relay circuit
B+ short in TRAC solenoid relay circuit
Open or short in TRAC motor relay circuit
B+ short in TRAC motor relay circuit
Open or short in ABS actuator solenoid circuit
(SFR circuit)
Open or short in ABS actuator solenoid circuit
(SFL circuit)
Open or short in ABS actuator solenoid circuit
(SRR circuit)
Open or short in ABS actuator solenoid circuit
(SRL circuit)
Open or short in TRAC actuator solenoid circuit
(SMC circuit)
Open or short in TRAC actuator solenoid circuit
(SRC circuit)
Right front wheel speed sensor signal
malfunction
Left front wheel speed sensor signal
malfunction
Right rear wheel speed sensor signal
malfunction
Left rear wheel speed sensor signal
malfunction
BR±56± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

BR±88.
BR±88
BR±92
BR±95
BR±97
BR±98
BR±100
BR±102
BR±104
CodeABS Warning Light
Blinking Pattern
Indicator
DiagnosisSee pageABS
Warning
LightTRAC
Indicator
LightTRAC
OFF
Light
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF*
OFF*
OFF*
OFF*
Always
ON
Open circuit in left front or right rear speed sensor
circuit
Open circuit in right front or left rear speed sensor
circuit
Low battery positive voltage or abnormally high
battery positive voltage
Open or short in lateral acceleration
sensor circuit
ABS pump motor is locked
Open in ABS pump motor ground
Brake fluid reservoir level low
Open circuit in TRAC pump motor circuit
TRAC ECU communication abnormal
Wheel speed sensor signal malfunction
Malfunction in ABS (& TRAC) ECU

: Only vehicles with TRAC
*: When a malfunction causing code No. 17, 18, 55, 58, 61 or 62 is detected, the ABS warning light does
not light up, but the TRAC indicator light does. However, when checking the DTC, check the blinking
pattern of the ABS warning light.
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±57

Symbols
(Terminals No.)STD Voltage (V)Condition
Always
IG switch ON
IG switch ON, ABS warning light OFF
IG switch ON
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light ON
IG switch ON, ABS warning light OFF
IG switch ON, PKB switch ON
IG switch ON, PKB switch OFF
Stop light switch OFF
Stop light switch ON
IG switch ON, ABS warning light OFF
IG switch ON
IG switch ON
IG switch ON
Slowly turn right front wheel
IG switch ON
IG switch ON
IG switch ON
IG switch ON, Vehicle parked on a level surface
IG switch ON, Vehicle parked on a level surface
Slowly turn left front wheel
Slowly turn left rear wheel
Slowly turn left rear wheel
10 ± 14
10 ± 14
9 ± 14
Below 1.0
10 ± 14
10 ± 14
10 ± 14
10 ± 14
10 ± 14
Below 2.0
10 ± 14
Below 1.5
10 ± 14
10 ± 14
10 ± 14
10 ± 14
10 ± 14
Below 1.5
AC generation
AC generation
AC generation
AC generation
4 ± 6
4 ± 6 or 7 ±11
BATGND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
(A19±25)(A19±15)
(A19±12)(A19±2)
IG 1
SRR±
R±MR
(A19±11)(A19±24)
(A19±23)(A19±24)
(A19±1)(A19±2)
SFR
SFL
SRR
SRL
AST
WA
PKB
STP
D/G
Tc
Ts
FR +
FL +
RR +
RL +
GS 1
GS 2
(A19±13)
(A19±26)
(A19±14)
(A19±18)
(A18±13)
(A18±14)
(A18±6)
(A18±4)
(A19±5)
(A18±15)
(A19±16)
(A19±9)
(A18±8)
(A18±9)
(A18±12)
(A18±3)
(A19±2)
(A19±15)
(A19±15)
(A19±15)
(A19±15)
(A19±15)
(A19±2)
(A19±2)
(A19±2)
(A19±15)
(A19±3)
(A19±22)
(A18±16)
(A18±1)
(A19±15)
(A19±2)
FR±
FL±
RR±
RL±
ECU TERMINALS STANDARD VALUE
w/o TRAC:
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±59

Symbols
(Terminals No.)STD Voltage (V)Condition
Always
IG switch ON
IG switch ON, ABS warning light OFF
IG switch ON
IG switch ON, TRAC and TRAC OFF indicator light OFF
IG switch ON
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, ABS warning light OFF
IG switch ON, TRAC and TRAC OFF indicator light OFF
IG switch ON, TRAC and TRAC OFF indicator light OFF
IG switch ON, ABS warning light ON
IG switch ON, ABS warning light OFF
IG switch ON, PKB switch ON
Fluid in M/C reservoir above MIN level.
IG switch ON, PKB switch OFF
Fluid in M/C reservoir above MIN level.
IG switch ON
Fluid in M/C reservoir above MIN level.
Stop light switch OFF
Stop light switch ON
IG switch ON, ABS warning light OFF
BATGND
GND
R±
R±
R±
R±
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
(A20±7)(A20±25)
(A20±24)(A20±25)
(A20±15)(A20±12)
(A20±2)(A20±12)
(A20±12)
(A20±12)
(A22±9)
(A20±25)
(A20±25)
(A22±9)
(A20±25)
(A22±9)
(A22±9)
(A22±4)
(A22±4)
(A20±25)
(A22±4)
(A22±9)
IG 1
SR
MR
TSR
TMR
SFR
SFL
SRR
SRL
AST
SMC
SRC
WA
PKB
LBL
STP
D/G
(A20±1)
(A20±14)
(A22±1)
(A20±13)
(A20±26)
(A22±7)
(A20±21)
(A22±2)
(A22±8)
(A22±5)
(A22±12)
(A20±10)
(A22±6)
(A22±10)
10 ±14
10 ±14
8.3 ±14
Below 1.0
8.3 ±14
Below 1.0
10 ±14
10 ±14
10 ±14
10 ±14
10 ±14
10 ±14
10 ±14
Below 2.0
10 ±14
Below 1.5
10 ±14
10 ±14
Below 1.5
8 ±14
10 ±14
w/ TRAC:
BR±60± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

SPEED SENSOR SIGNAL CHECK
1. Turn the ignition switch OFF
2. Using SST, connect terminals Ts and E1 of DLC1.
SST 09843±18020
3. Start the engine.
4. Check that the ABS warning light blinks.
HINT:
wIf the ABS warning light does not blink, inspect the ABS
warning light circuit (See page BR±107).
wIf the ABS warning light is always on, inspect and repair
the IG1 terminal of lateral acceleration sensor.
5. Drive the vehicle faster than 45 km/h (28 mph) for several
seconds.
6. Stop the vehicle.
7. Using SST, connect terminals Tc and E1 of DLC1.
SST 09843±18020
8. Read the number of blinks of the ABS warning light.
HINT: See the list of diagnostic trouble codes shown on the
next page.
If every sensor is normal, a normal code is output (A cycle of
0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunctions are indicated at the same time, the
lowest numbered code will be displayed first.
9. After doing the check, disconnect terminals Ts and E1, Tc and
E1 of DLC1, and turn ignition switch OFF. BR±62
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

PROBLEM SYMPTOMS CHART
If a normal code is displayed during the diagnostic trouble code check but the problem still occurs, check the
circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshoot-
ing page.
 
 Symptoms
 
 Inspection Circuit
 
 See page
 
 
 
 
 
 
 
 
 
ABS does not
operate.
 
 
 
 
 
 
 
 
 
Only when 1. ~ 4. are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.
1. Check the diagnostic trouble code, reconfirming that the normal
code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
BR±115). 
 
 
 
 
 
 
 
 
BR±54
BR±92
BR±88
BR±44
 
 
 
 
 
 
 
 
ABS does not
operate efficiently
 
 
 
 
 
 
 
 
Only when 1. ~ 4. Are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.
1. Check the diagnostic trouble code, reconfirming that the normal
code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
BR±115). 
 
 
 
 
 
 
 
BR±54
BR±88
BR±105
BR±44
 
 
 
ABS warning
light abnormal
 
 
 
1. ABS warning light circuit.
2. ABS (& TRAC) ECU.
 
 
 
BR±107
 
 
 
 
Diagnostic trouble
code check cannot
be performed
 
 
 
 
Only when 1 and 2 are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.
1. ABS warning light circuit.
2. Tc terminal circuit. 
 
 
 
BR±107
BR±112
 
 
 
 
Speed sensor signal
check cannot be
performed
 
 
 
 
1. Ts terminal circuit.
2. ABS (& TRAC) ECU.
 
 
 
 
BR±114
BR±64± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

DTC 44 Lateral Acceleration Sensor Circuit
CIRCUIT DESCRIPTION
This sensor detects acceleration acting laterally on the vehicle. The sensor signal is used in ABS control. If the
sensor functions abnormally, the ABS warning light comes on but the ABS still operates.
 
 DTC No.
 
 Diagnostic Trouble Code Detecting Condition
 
 Trouble area
 
 
 
 
 
44
 
 
 
 
 
Either of the following (1) or (2) is detected:
(1) An open or short is detected in circuit
GS1 or GS2 for 1 sec.
(2) After the ignition is turned ON, the test
signal is output by GST. During this time,
a trouble signal is detected for 0.5 sec. 
 
 
 
 

Lateral acceleration sensor

Open or short in lateral acceleration sensor circuit

ECU
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±95

Check brake fluid level.
Check brake fluid level warning switch.
Check and repair brake fluid leakage and
add fluid.
Replace brake fluid level warning switch.
Repair or replace harness or connector.
Check and replace ABS & TRAC ECU.
Check for short in all the harness and components connected to brake fluid
level warning light (See page IN±30).
See page BE±52.
Check the amount of fluid in the brake reservoir.
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±99