1991 LEXUS SC400 brake

Location of Connectors in Instrument Panel
BR±180±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±181
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BR±182±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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±MEMO±
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±183
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Location of Connectors in Body
SC300
BR±184±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±185
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WIRING DIAGRAM
IN±33).
DTC24TRAC Sub±Throttle Actuator Circuit
CIRCUIT DESCRIPTION
The sub±throttle actuator operates in accordance with signals from the E\
CU, controlling the opening and
closing of the sub±throttle valve.
DTC No.DTC Detecting ConditionTrouble Area
24Open or short in sub±throttle actuator circuit

TRAC fuse

Open or short in BM circuit.

Sub±throttle actuator.

Open or short in sub±throttle actuatorcircuit.

ECU
DIAGNOSTIC CHARTDIAGNOSTIC CHART
BR±186±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)
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OKNG
OKNG
INSPECTION PROCEDURES
1Check TRAC fuse.
C
OK
PRemove TRAC fuse from R/B No. 2.
Check continuity of TRAC fuse.
Continuity
Check for short in all harness and components con-
nected to TRAC fuse (See attached wiring diagram).
2Check voltage between terminals BM and GND or TRAC ECU.
C
OK
PRemove TRAC ECU with connectors still connected.
Measure voltage between terminals BM and GND of
TRAC ECU.
Voltage: 10 ± 14 V
Check and repair harness or connector.
±
BRAKE SYSTEM TRACTION CONTROL SYSTEM (TRAC)BR±187
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