Lexus ES300 (2002 year). Manual — part 299

F10761

F10180

Connector 2

1

2

2

1

Connector 1

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-317

470

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

2

INSPECT SKID CONTROL SENSOR

(a)

Disconnect the sensor connector.

(b)

Measure resistance between terminals 1 and 2 of the
sensor connector.
OK: 1.2 - 1.6 k

Ω

at

20

C

(c)

Measure resistance between each of terminals 1 and 2 of
sensor connector and body ground.
OK: 1 M

Ω

or higher

Skid control Sensor Sub-Wire Harness:
(a)

Remove the seat cushion and seatback.

(b)

Make sure that there is no looseness at the connector
lock part and connecting part of the connector.

(c)

Measure resistance between terminal 1 of connector 1
and terminal 2 of connector 2.

(d)

Measure resistance between terminal 2 of connector 1
and terminal 1 of connector 2.
OK: 1

Ω

or lower

(e)

Measure resistance between terminals 1 and 2 of speed
sensor connector 1 and body ground.
OK: 10 M

Ω

or higher

NG

REPLACE SKID CONTROL SENSOR OR
SUB-WIRE HARNESS

NOTICE:
Check the speed sensor signal last (See page

05-288

).

OK

3

CHECK HARNESS AND CONNECTOR(SKID CONTROL SENSOR - SKID
CONTROL ECU)

(a)

Check for open and short circuit in harness and connector between each sensor and skid control ECU
connector (See page

01-31

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

W04200

Normal Signal Waveform

1 V / Division

2 m/s / Division

GND

F10178

OK

NG

05-318

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

471

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

4

CHECK SENSOR AND SENSOR ROTOR SERRATIONS

(REFERENCE) INSPECTION USING OSCILLOSCOPE
(a)

Remove the skid control ECU with connector still con-
cocted.

(b)

Connect the oscilloscope to the terminals RR+, RR- and
and GND of the skid control ECU.

(c)

Drive the vehicle at about 30 km/h (19 mph), and check
the signal waveform.

HINT:

As the vehicle speed (wheel revolution speed) increases,
a cycle of the waveform becomes shorter and the fluctua-
tion in the output voltage becomes greater.

When noise is identified in the waveform on the oscillo-
scope, error signals are generated due to the speed sen-
sor rotor’s scratches, looseness or foreign matter depos-
ited on it.

OK

CHECK AND REPLACE SKID CONTROL ECU
ASSY

NG

5

CHECK SKID CONTROL SENSOR INSTALLATION

(a)

Check the speed sensor installation.
OK:
There is no clearance between the sensor and rear
axle hub.

NG

REPAIR OR REPLACE SKID CONTROL
SENSOR

NOTICE:
Check the speed sensor signal last (See page

05-288

).

OK

6

CHECK SPEED SENSOR ROTOR AND SENSOR TIP

NG

CLEAN OR REPLACE SPEED SENSOR AND
SENSOR ROTOR SERRATIONS

NOTICE:
Check the speed sensor signal last (See page

05-288

).

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-319

472

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DTC

C0226/21 SFR SOLENOID CIRCUIT

DTC

C0226/21 SFR SOLENOID CIRCUIT

DTC

C0236/22 SFL SOLENOID CIRCUIT

DTC

C0246/23 SRR SOLENOID CIRCUIT

DTC

C0256/24 SRL SOLENOID CIRCUIT

CIRCUIT DESCRIPTION

The solenoid goes on when signals are received from the ECU and controls the pressure action on the wheel
cylinders thus controlling the braking force.

DTC No.

DTC Detecting Condition

Trouble Area

C0226/21

Open or short in SFRH or SFRR circuit for 0.05 sec. or
more.

IG1 terminal voltage of skid control ECU is 9.5 - 18.5 V,
and while ABS is control in operation, there is solenoid
relay contact OFF for 0.05 sec. or longer.

Brake actuator

SFRH or SFRR circuit

C0236/22

Open or short in SFLH or SFLR circuit for 0.05 sec. or
more.

IG1 terminal voltage of skid control ECU is 9.5 - 18.5 V,
and while ABS is control in operation, there is solenoid
relay contact OFF for 0.05 sec. or longer.

Brake actuator

SFLH or SFLR circuit

C0246/23

Open or short in SRRH or SRRR circuit for 0.05 sec. or
more.

IG1 terminal voltage of skid control ECU is 9.5 - 18.5 V,
and while ABS is control in operation, there is solenoid
relay contact OFF for 0.05 sec. or longer.

Brake actuator

SRRH or SRRR circuit

C0256/24

Open or short in SRLH or SRLR circuit for 0.05 sec. or
more.

IG1 terminal voltage of skid control ECU is 9.5 - 18.5 V,
and while ABS is control in operation, there is solenoid
relay contact OFF for 0.05 sec. or longer.

Brake actuator

SRLH or SRLR circuit

052B2-03

F41978

Skid Control ECU

ABS & Traction Actuator

ABS R/B

ABS SOL Relay

Engine Room J/B

Battery

ABS No. 3

SFLH

10

S8

SR

6

L-B

1

R+

SFLR

7

SRRH

8

SRRR

9

SFRH

16

SFRR

8

SRLH

7

SRLR

1

W-L

W-R

GR-R

R-B

W-R

G-Y

LG-B

32

A5

29

18

30

17

33

8

31

SFLH

SFLR

SRRH

SRRR

SFRH

SFRR

SRLH

SRLR

BS

W-L

23

A5

R-G

GR

2

2

2

2

2

1

5

3

W

1

1A

7

1E

1

2

B-G

ALT

1

1

1

2

FL MAIN

S8

S5

A5

A5

A5

A5

A5

A5

A5

B-G

Engine Room R/B

S5

S5

S5

S8

S8

S8

S8

F07812

SRRH

SFLH SRLR

SFLR

SRRR

SRLH

SFRR

SFRH

05-320

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

473

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

WIRING DIAGRAM

INSPECTION PROCEDURE

1

INSPECT ABS & TRACTION ACTUATOR ASSY(SFRH, SFLH, SRRH, SRLH, SFRR,
SFLR, SRRR, SRLR SOLENOID)

(a)

Disconnect the brake actuator connector.

(b)

Check continuity between terminal BS and terminals
SFRH, SFLH, SRRH, SRLH, SFRR, SFLR, SRRR and
SRLR of brake actuator.
OK: Continuity

HINT:
Resistance of each solenoid
SFRH, SFLH, SRRH, SRLH: 8.1 - 9.1

Ω

SFRR, SFLR, SRRR, SRLR: 4.0 - 4.6

Ω

NG

REPLACE ABS & TRACTION ACTUATOR ASSY

OK