Lexus SC300 / Lexus SC400. Manual — part 242
–MEMO–
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BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
BR–219
WIRING DIAGRAM
DTC
61
ABS & TRAC ECU Communication Circuit
Malfunction
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
61
Malfunction in ABS & TRAC ECU communication cir-
cuit.
Open or short in ABSO, BRC, BRP circuit
ABS & TRAC ECU
TRAC ECU
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–220
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BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
OK
NG
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminals ABSO, BRC, BRP of TRAC ECU and body ground.
C
OK
Hint
P
Remove TRAC ECU with connectors still connected.
Measure voltage between terminals ABSO, BRC, BRP
of TRAC ECU and body ground when ignition switch is
turned ON.
Voltage:
ABSO, BRC: 6 – 14 V
BRP: About 7 V (Pulse)\
(Reference)
Check and replace TRAC ECU.
2
Check voltage between terminals ABSO, BRC, BRP or TRAC ECU and body ground with TRAC
ECU connector is disconnected.
C
OK
Hint
P
Disconnect TRAC ECU connector.
Measure voltage between terminals ABSO, BRC, BRP
or TRAC ECU connector and body ground when ignition
switch is turned ON.
Voltage:
See step 1.
Check and replace TRAC ECU.
3
Check for open and short in harness and connector between ABS & TRAC ECU and TRAC ECU
(See page
IN–33
).
Repair or replace harness or connector.
Check and replace ABS & TRAC ECU.
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BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
BR–221
TRAC OFF Indicator, TRAC Cut Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC cut switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator is also used for warnings when the trouble occurs.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–222
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BRAKE SYSTEM
TRACTION CONTROL SYSTEM (TRAC)
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