Lexus SC300 / Lexus SC400. Manual — part 274
OK
NG
OK
NG
3
Check continuity between terminal GND of ABS (& TRAC) ECU connector and body ground.
C
OK
Measure resistance between terminals GND or ABS (&
TRAC) ECU connector and body ground.
Resistance:
1
or less
Repair or replace harness or connector.
4
Check ECU–IG fuse.
C
OK
P
Remove ECU–IG fuse from J/B No. 1.
Check continuity of ECU–IG fuse.
Continuity
Check for short in all the harness and components con-
nected to ECU–IG fuse (See attached wiring diagram).
Check for open in harness and connector between
ABS (& TRAC) ECU and battery (See page
BR–124
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
WIRING DIAGRAM
DTC
51
ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
51
Pump motor is not operating normally duringinitial
check.
ABS pump motor
Fail safe function:
If trouble occurs in the ABS pump motor, the ECU cuts off the current to the solenoid
relay and prohibits ABS control.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
See inspection of ABS pump motor (See page
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–125
IN–3
3
DTC
53
TRAC–Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
53
TRAC pump motor is locked
Open for TRAC pump motor ground.
TRAC pump motor
Harness or connector between TRAC pump&
motor and body ground.
TRAC Actuator
ABS & TRAC ECU
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–126
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
WIRING DIAGRAM
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–127
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