Lexus SC300 / Lexus SC400. Manual — part 269
OK
NG
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminal 1 of R/B No. 6 (for TRAC solenoid relay) and body ground.
C
OK
P
Remove TRAC solenoid relay from R/B No. 6.
Measure voltage between terminal 1 o R/B No. 6 (for
TRAC solenoid relay) and body ground.
Voltage:
10 – 14 V
Repair or replace harness or connector.
2
Check continuity between terminal 3 of R/B No. 6 (for TRAC solenoid relay) and terminals SAC,
SMC, SRC or ABS & TRAC ECU.
C
OK
Hint
Check continuity between terminal 3 of R/B No. 6 (for
TRAC solenoid relay) and terminals SAC, SMC, SRC of
ABS & TRAC ECU.
Continuity
Resistance of the TRAC actuator solenoid is 2
.
Repair or replace harness or TRAC actuator.
BR–104
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
OK
NG
OK
NG
3
Check TRAC solenoid relay.
C
OK
P
OK
C
Remove solenoid relay from R/B NO. 6.
Check continuity between each terminal of TRAC sole-
noid relay shown below.
1.
Apply battery voltage between terminals 4 and 6.
2.
Check continuity between terminals shown below.
Replace TRAC solenoid relay.
4
Check for open and short in harness and connector between TRAC solenoid relay and ABS &
TRAC ECU (See page
).
Repair or replace harness or connector.
If the same code is still output after the diagnostic trouble code is deleted, check the contact condition
of each connection.
If the connections are normal, the ECU may be defective.
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–105
DTC
17, 18 TRAC Motor Relay Circuit
CIRCUIT DESCRIPTION
This relay circuit supplies power to the TRAC pump motor. If the accumulator pressure drops, the ECU switches
the motor relay ON and operates the TRAC motor.
DTC No.
DTC Detecting Condition
Trouble Area
17
Conditions (1) through (2) continue for 0.2 sec.or more:
(1) TRAC motor relay (TMR) terminal voltage: Battery
positive voltage
(2) Voltage of ABS & TRAC ECU terminal MTT: 0 V
TRAC motor relay
Open or short in TRAC motor relay circuit
ECU
18
Conditions (1) and (2) continue for 2 sec. ormore:
(1) TRAC motor relay (TSR) terminalvoltage: 0 V
(2) Voltage of ABS & TRAC ECU terminal MTT: Battery
positive voltage
TRAC motor relay
B+ short in TRAC motor relay circuit
ECU
Fail safe function:
If trouble occurs in this relay circuit, the ECU cuts off the current to the TRAC solenoid
relay and prohibits TRAC control.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
BR–106
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
WIRING DIAGRAM
–
BRAKE SYSTEM
ANTI–LOCK BRAKE SYSTEM (ABS)
BR–107
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