1991 LEXUS SC400 Service Repair Manual

AUX air bleeding lumbar support hood open tyre pressure hood release

Page 1049 of 4087

LEXUS SC400 1991 Service Repair Manual
SPEED SENSOR SIGNAL CHECK
1. Turn the ignition switch to 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. H

Page 1050 of 4087

LEXUS SC400 1991 Service Repair Manual
ECU DATA MONITOR USING LEXUS HAND±HELD TESTER
1. Hook up the LEXUS hand±held tester to the DLC2.
2. Monitor the ECU data by following the prompts on the testerscreen.
HINT: LEXUS hand±held teste

ECU DATA MONITOR USING LEXUS HAND±HELD TESTER
1. Hook up the LEXUS hand±held tester to the DLC2.
2. Monitor the ECU data by following the prompts on the testerscreen.
HINT: LEXUS hand±held tester has a ªSnapshotº function
which records the monitored data.
Please refer to the LEXUS 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

71
\
\
Low output voltage of right front speed sensor

Sensor installation
72\
\
Low output voltage of left front speed sensor
Left front speed sensor
72\
\
Low output voltage of left front speed sensor
Sensor installation

73
\
\
Low output voltage of right rear speed sensor

Right rear speed sensor
73\
\
Low output voltage of right rear speed sensor
Sensor installation

74
\
\
Low output voltage of left rear speed sensor

Left rear speed sensor 74\
\
Low output voltage of 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 SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±81
WhereEverybodyKnowsYourName

Page 1051 of 4087

$LEXUS SC400 1991 Service Repair Manual PROBLEM SYMPTOMS CHART If a normal code is displayed during the diagnostic trouble code check but\ the problem still occurs, check the circuits for each problem symptom in the order given in the tab$

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 page for
troubleshooting.
Symptoms\
\
Inspection Circuit See page

ABS does not oper-
ate.\

\

\

Only when 1.±4. are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.

BR±76

\

\

\

1. Check the diagnostic trouble code, reconfirming that the nor-
mal code is output.

BR±122
BR±118
\
\
2. IG Power Source Circuit. BR±65 or 68

\

\

\
3. Speed sensor circuit.

\

\

\

\

4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (see page
BR±138).

ABS does not oper-
ate efficiently.\

\

\

Only when 1.±4. are all normal and the problem is still occurring,
replace the ABS (& TRAC) ECU.

BR±76

\

\

\

1. Check the diagnostic trouble code, reconfirming that the nor-
mal code is output.

BR±118
BR±142
\
\
2. Speed sensor circuit. BR±65
or 68
\
\
3. Stop light switch circuit

\

\

\

\

4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (see page
BR±138).

ABS warning light ab-
normal.\

\

\

1. ABS warning light circuit.

BR±144
\
\
2. ABS (& TRAC) ECU.

Diagnostic trouble
code check cannot
be performed.\

\

\

\

Only when 1. and 2. are all normal and the problem is still occur-
ring, replace the ABS (& TRAC) ECU.

BR±144
\
\
1. ABS warning light circuit BR±148

\

\

\
2. To terminal circuit.

Speed sensor signal
check cannot be per-
formed.\

\

\

1. Ts terminal circuit.

BR±150

\

\

\
2. ABS (& TRAC) ECU.

BR±82±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
WhereEverybodyKnowsYourName

Page 1052 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±83
WhereEverybodyKnowsYourName

Page 1053 of 4087

LEXUS SC400 1991 Service Repair Manual
LOCATION OF CONNECTORS
Location of Connectors in Engine Compartment
BR±84±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
WhereEverybodyKnowsYourName

Page 1054 of 4087

LEXUS SC400 1991 Service Repair Manual
SC400:
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±85
WhereEverybodyKnowsYourName

Page 1055 of 4087

LEXUS SC400 1991 Service Repair Manual
BR±86±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)
WhereEverybodyKnowsYourName

Page 1056 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Instrument Panel
±
BRAKE SYSTEM ANTI±LOCK BRAKE SYSTEM (ABS)BR±87
WhereEverybodyKnowsYourName

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