1995 TOYOTA SUPRA sensor

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

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)

ECU DATA MONITOR USING TOYOTA
HAND±HELD TESTER
1. Hook up the TOYOTA hand±held tester to the DLC2.
2. Monitor the ECU data by following the prompts on the tester
screen.
HINT: TOYOTA hand±held tester has a ºSnapshotº function
which records the monitored data.
Please refer to the TOYOTA hand±held tester operator's
manual for further details.
Diagnostic Trouble Code of Speed Sensor Check Function
 Code No. Diagnosis Trouble Area
 
 71
 
 Low output voltage of right front speed sensor
 
 

Right front speed sensor

Sensor installation
 
 72
 
 Low output voltage of left front speed sensor
 
 

Left front speed sensor

Sensor installation
 
 73
 
 Low output voltage of right rear speed sensor
 
 

Right rear speed sensor

Sensor installation
 
 74
 
 Low output voltage of left rear speed sensor
 
 

Left rear speed sensor

Sensor installation
 
 75
 
 
Abnormal change in output voltage of right front speed
sensor 
 
Right front speed sensor rotor
 
 76
 
 
Abnormal change in output voltage of left front speed
sensor 
 
Left front speed sensor rotor
 
 77
 
 
Abnormal change in output voltage of right rear speed
sensor 
 
Right rear speed sensor rotor
 
 78
 
 
Abnormal change in output voltage of left rear speed
sensor 
 
Left rear speed sensor rotor
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±63

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)

CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
both the ABS and TRAC control systems. The front and rear ro-
tors each have 48 serrations. When the rotors rotate, the mag-
netic field emitted by the permanent magnet in the speed sensor
generates an AC voltage. Since the frequency of this AC volt-
age changes in the direct proportion to the speed of the rotor,
the frequency is used by the ECU to detect the speed of each
wheel.
31, 32
33, 34
35
36
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 5 sec.
(2) Momentary interruption of he vehicle
speed sensor signal occurs at least 7
times in the time between switching the
ignition switch ON and switching it OFF.
(3) Abnormal fluctuation of speed sensor sig±
nals with the vehicle speed 20 km/H (12
mph) or more.
Speed sensor signal is not input for about 1
sec. while the left front and right rear speed
sensor signals are being checked with the IG
switch ON.
Speed sensor signal is not input for about 1
sec. while the right front and left rear speed
sensor signals are being checked with the IG
switch ON.

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

Open or short in each speed sensor circuit.

ECU

Open in left front, right rear speed sensor
circuit.

ECU

Open in right front, left rear speed sensor
circuit.

ECU
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.
DTC 31 32 33 34 35 36 Speed Sensor Circuit
BR±88± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

Check speed sensor.
Replace speed sensor.
Repair or replace harness or connector.
Check for open and short in harness and connector between each speed sen-
sor and ECU (See page
IN±30).
NOTICE: Check the speed sensor signal last (See page BR±62).
Front
Rear
1. Remove front fender splash shield.
2. Disconnect speed sensor connector.
Measure resistance between terminals 1 and 2 of
speed sensor connector.
Resistance : 0.7 Ð 1.7 k
Measure resistance between terminals 1 and 2 of
speed sensor connector and body ground.
Resistance : 1 Mor higher
1. Remove rear set cushion, seat back and
quarter trim panel.
2. Disconnect speed sensor connector.
Measure resistance between terminals 1 and 2 of
speed sensor connector.
Resistance : 0.7 Ð 1.7 k
Measure resistance between terminals 1 and 2 of
speed sensor connector and body ground.
Resistance : 1 Mor higher BR±90
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)

Check sensor rotor and sensor installation.
Replace speed sensor or rotor.
Remove front speed sensor rotor (See page
SA±15).
Check sensor rotor serrations.
No scratches or missing teeth.
Check the front speed sensor installation.
The installation bolt is tightened properly.
Remove the drive shaft (See page BR±45).
Check sensor rotor serrations.
No scratches or missing teeth.
Check and replace ABS (& TRAC) ECU.
NOTICE: Check the speed sensor signal last (See page BR±62).
Check the rear speed sensor installation.
The installation bolt is tightened properly and
there is no clearance between the sensor and
rear axle carrier.
± BRAKE SYSTEMANTI±LOCK BRAKE SYSTEM (ABS)BR±91