Lexus ES300 (1997 year). Manual — part 376
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DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–281
433
1997 LEXUS ES300 (RM511U)
TRC+ (A20 – 13) – GND (A19 – 15, A21 – 9, 10)
Pulse generation
TRAC control active
TRC– (A20 – 5) – GND (A19 – 15, A21 – 9, 10)
Pulse generation
TRAC control active
IND (A20
3)
GND (A19
15 A21
9 10)
Below 2.0
IG switch ON, SLIP indicator light ON
IND (A20 – 3) – GND (A19 – 15, A21 – 9, 10)
10 – 14
IG switch ON, SLIP indicator light OFF
WT (A20
12)
GND (A19
15 A21
9 10)
Below 2.0
IG switch ON, TRAC OFF indicator light ON
WT (A20 – 12) – GND (A19 – 15, A21 – 9, 10)
10 – 14
IG switch ON, TRAC OFF indicator light OFF
CSW (A20
11)
GND (A19
15 A21
9 10)
Below 2.0
IG switch ON, TRAC cut switch pushed in
CSW (A20 – 11) – GND (A19 – 15, A21 – 9, 10)
8 – 14
IG switch ON, TRAC cut switch released
DI0C1–01
DI–282
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DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
434
1997 LEXUS ES300 (RM511U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC 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 relevant troubleshooting page.
Symptoms
Inspection Circuit
See page
ABS does not operate.
Only when 1.
∼
4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS & TRAC actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
ABS does not operate
efficiently.
Only when 1.
∼
4. are all normal and the problem is still occurring, replace the
ABS ECU.
1. Check the DTC reconfirming that the normal code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS & TRAC actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page
ABS warning light
abnormal.
1. ABS warning light circuit.
2. ABS & TRAC ECU.
DTC check cannot be done.
Only when 1. and 2. are all normal and the problem is still occurring, replace the
ABS & TRAC ECU.
1. ABS warning light circuit.
2. TRAC OFF indicator light circuit.
3. Tc terminal circuit.
Speed sensor signal check
cannot be done.
1. Ts terminal circuit.
2. ABS & TRAC ECU.
TRAC does not operate.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring, replace the ABS & TRAC ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. IG power source circuit.
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit.
SLIP indicator light
abnormal.
SLIP indicator light circuit.
TRAC OFF indicator light
abnormal.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring, replace the ABS & TRAC ECU.
1. TRAC OFF indicator light circuit.
2. TRAC cut switch circuit.
DI0C2–01
F00081
ABS
ALT
ABS & TRAC
Solenoid Relay
B–G
3
A7
Engine Room R/B No. 3
SR
F9
FL
Block
MAIN
Battery
F6
ABS & TRAC
Actuator
DLC1
GR
5
4
1
GR–R
6
A19
11
2
EA
3
ABS & TRAC
ECU
R+
AST
W–L
W–B
R
10
EB
1
B–G
3
3
3
3
3
1
W–B
W–B
A7
A19
A19
1
ABS & TRAC
ECU
1
2
4
5
ABS
ALT
ABS & TRAC
Solenoid Relay
B–G
3
A7
Engine Room R/B No. 3
SR
F9
FL
Block
MAIN
Battery
F6
ABS & TRAC
Actuator
DLC1
GR
5
4
1
GR–R
6
A19
11
2
EA
3
ABS & TRAC
ECU
R+
AST
W–L
W–B
R
10
EB
1
B–G
3
3
3
3
3
1
W–B
W–B
A7
A19
A19
1
ABS & TRAC
ECU
1
2
4
5
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DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–283
435
1997 LEXUS ES300 (RM511U)
CIRCUIT INSPECTION
DTC
11, 12
ABS & TRAC Solenoid Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS & TRAC solenoid. After the ignition switch is turned ON, if the initial
check is OK, the relay goes on.
DTC No.
DTC Detecting Condition
Trouble Area
11
Condition (1) to (3) are detected:
(1) Malfunction of solenoid relay monitor.
(2) Battery voltage will not exceed more than 17.0 V
within 2.16 sec.
(3) Battery voltage will not become less than 9.5 V within
2.16 sec., or after the solenoid relay is ON and AST
voltage of ECU terminal does not become 8.0 V or
more.
ABS & TRAC solenoid relay
ABS & TRAC solenoid relay circuit
ECU
12
Solenoid relay is OFF in the midst of premain routine, and
AST voltage of ECU terminal is 8.0 V or more continues
for 2.04 sec. or more.
Fail safe function: If trouble in the ABS & TRAC solenoid relay circuit, the ECU cuts off current to the ABS
& TRAC solenoid relay and prohibits ABS control and TRAC control.
WIRING DIAGRAM
F00048
(+)
(–)
1 2
Engine Room
R/B No. 3
3
4 5 6
(+)
(–)
1 2
Engine Room
R/B No. 3
3
4 5 6
(+)
(–)
1 2
Engine Room
R/B No. 3
3
4 5 6
(+)
(–)
1 2
Engine Room
R/B No. 3
3
4 5 6
F00055
ABS & TRAC
Solenoid
Relay
3
A7
A19
AST
4
5
ABS & TRAC
Actuator
ECU
ABS & TRAC
Solenoid
Relay
3
A7
A19
AST
4
5
ABS & TRAC
Actuator
ECU
ABS & TRAC
Solenoid
Relay
3
A7
A19
AST
4
5
ABS & TRAC
Actuator
ECU
ABS & TRAC
Solenoid
Relay
3
A7
A7
A19
AST
4
5
ABS & TRAC
Actuator
ECU
DI–284
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DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
436
1997 LEXUS ES300 (RM511U)
INSPECTION PROCEDURE
1
Check voltage between terminals 1 and 2 of Engine Room R/B No. 3 (for ABS &
TRAC solenoid relay).
PREPARATION:
Remove ABS & TRAC solenoid relay from Engine Room R/B
No. 3.
CHECK:
Measure the voltage between terminals 1 and 2 of Engine
Room R/B No. 3 (for ABS & TRAC solenoid relay).
OK:
Voltage: 10 – 14 V
NG
Check and repair harness or connector.
OK
2
Check continuity between terminal 3 of ABS & TRAC solenoid relay and terminal
AST of ABS & TRAC ECU.
CHECK:
Check continuity between terminal 3 of ABS solenoid relay and
terminal AST of ABS & TRAC ECU.
OK:
Continuity
HINT:There is a resistance of 33
Ω
between terminals A7 – 4
and A7 – 5 of ABS actuator.
NG
Repair or replace harness or ABS & TRAC
actuator.
OK
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