Lexus ES300 (1997 year). Manual — part 378
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–289
441
1997 LEXUS ES300 (RM511U)
DTC
21 to 28
ABS & TRAC Actuator Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.
DTC Detecting Condition
Trouble Area
21
ABS actuator
SFRR or SFRH circuit
ECU
22
ABS actuator
SFLR or SFLH circuit
ECU
23
Conditions (1) and (2) or (3) continued for 0.48 sec. or
more:
ABS actuator
SRRR or SRRH circuit
ECU
24
(1) Recovery prohibit run pulse is not output, solenoid
relay is ON, AST voltage of ECU terminal is 8.0 V or
more, and solenoid output has no change between the
last time and this time
ABS actuator
SRLR or SRLH circuit
ECU
25
last time and this time.
(2) Solenoid output is ON, pressure holding solenoid
monitor voltage is more than 1.0 V or pressure
reduction solenoid monitor voltage is more than 1 5 V
ABS actuator
SMC1 circuit
ECU
26
reduction solenoid monitor voltage is more than 1.5 V.
(3) Solenoid output is OFF, solenoid monitor voltage is
more than –1.0 V AST voltage of ECU.
ABS actuator
SMC2 circuit
ECU
27
ABS actuator
SRC1 circuit
ECU
28
ABS actuator
SRC2 circuit
ECU
Fail safe function: If trouble occurs in the actuator solenoid circuit, the ECU cuts off current to the ABS
& TRAC solenoid relay and prohibits ABS control and TRAC control.
DI0C4–01
F00084
Engine Room R/B No. 3
6
4
DLC1
ABS & TRAC Actuator
A19
A7
A8
12
A21
GR
5
SFLH
GR–R
SRLH
ABS & TRAC ECU
3
ABS & TRAC
Solenoid Relay
2
1
ALT
F6
F9
ABS
FL
Block
W–L
SMC2
MAIN
W–B
B–G
Battery
SRRH
SFRR
SRLR
AST
EA
4
EB
1
B–G
3
3
3
3
3
W–B
W–B
1
2 1
3
A7
A8
A8
A8
A8
A8
A8
A8
A8
A8
A8
A8
A19
A19
A19
A19
A19
A19
A21
A21
A21
A21
A21
A21
A21
7
8
9
10
11
13
25
26
R
SFRH
1
2
5
6
4
3
5
1
11
2
8
12
1
7
5
4
12
6
10
R–B
G–Y
R–G
LG–B
SR
R+
W–R
L–B
B–Y
B–R
Y–B
Y–R
W–R
W–L
SFLR
SRRR
SRC1
SMC1
SRC2
Engine Room R/B No. 3
6
4
DLC1
ABS & TRAC Actuator
A19
A7
A8
12
A21
GR
5
SFLH
GR–R
SRLH
ABS & TRAC ECU
3
ABS & TRAC
Solenoid Relay
2
1
ALT
F6
F9
ABS
FL
Block
W–L
SMC2
MAIN
W–B
B–G
Battery
SRRH
SFRR
SRLR
AST
EA
4
EB
1
B–G
3
3
3
3
3
W–B
W–B
1
2 1
3
A7
A8
A8
A8
A8
A8
A8
A8
A8
A8
A8
A8
A19
A19
A19
A19
A19
A19
A21
A21
A21
A21
A21
A21
A21
7
8
9
10
11
13
25
26
R
SFRH
1
2
5
6
4
3
5
1
11
2
8
12
1
7
5
4
12
6
10
R–B
G–Y
R–G
LG–B
SR
R+
W–R
L–B
B–Y
B–R
Y–B
Y–R
W–R
W–L
SFLR
SRRR
SRC1
SMC1
SRC2
F00057
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
1
2
3
4
5
6
7
8
9
10
11
12
A7
A8
4
DI–290
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
442
1997 LEXUS ES300 (RM511U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1
Check ABS & TRAC actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from ABS & TRAC actuator.
CHECK:
Check continuity between terminals A7 – 4 and A8 – 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12 of ABS & TRAC actuator connector.
OK:
Continuity
HINT:Resistance of each solenoid coil is 1.2
Ω
.
NG
Replace ABS & TRAC actuator.
OK
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
DI–291
443
1997 LEXUS ES300 (RM511U)
2
Check for open and short in harness and connector between ABS & TRAC ECU
and actuator (See page
).
NG
Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.
BR3583
BR3582
F00010
Rotor
Speed Sensor
Magnet
To ECU
+V
–V
High Speed
Low Speed
Coil
N
S
DI–292
–
DIAGNOSTICS
ABS & TRACTION CONTROL SYSTEM
444
1997 LEXUS ES300 (RM511U)
DTC
31, 32, 33, 34
Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
of the ABS and TRAC system. The front and rear rotors each
have 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.
DTC Detecting Condition
Trouble Area
31, 32, 33, 34
Detection of any of conditions from (1) through (3):
(1) ABS non–operation, wheel speed is 10 km/h or
more, one eighth of maximum wheel speed is greater
than the minimum wheel speed, one eighth of
maximum wheel speed is smaller than the rear
maximum wheel speed or momentary interruption of
both the rear wheels are shown in the 15 sec. or more
continuously.
(2) ABS non–operation, momentary interruption of speed
sensor occurs 7 times or more in the mean time of
switching the ignition switch ON and OFF or vehicle
speed is 20 km/h (12 mph) or more and the condition
of noise interference or non–noise interference occurs
75 times or more within 5 sec.
(3) Vehicle is at a stop, malfunction signal of vehicle speed
sensor hardware open circuit is ON for 1.02 sec.
continuously since starting the checking of a certain
vehicle.
Right front, left front, right rear, left rear speed sensor
Each speed sensor circuit
Speed sensor rotor
ECU
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function: If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS & TRAC
solenoid relay and prohibits ABS control and TRAC control.
DI0C5–01
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