Lexus ES300 (2002 year). Manual — part 317

C52361

Tc

CG

DLC3

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-381

534

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

2

CHECK HARNESS AND CONNECTOR(SKID CONTROL ECU ASSY - DLC3, DLC3
- BODY GROUND)

(a)

Check for open and short circuit in harness and connector between terminal Tc of the skid control ECU
and DLC3 (See page

01-31

).

(b)

Check for open circuit in harness and connector between terminal CG of the DLC3 and body ground
(See page

01-31

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY

3

INSPECT ABS AND VSC WARNING LIGHT

SST

09843-18040

(a)

Using SST, connect the terminals Tc and CG of the DLC3.

(b)

Turn the ignition switch ON.

(c)

Check the ABS and VSC warning right.
OK: Warning light blinking

OK

END

NG

CHECK AND REPLACE SKID CONTROL ECU ASSY

055XL-02

05-250

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

403

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

PROBLEM SYMPTOMS TABLE

If a normal code is displayed during the DTC check although 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.
NOTICE:
When replacing skid control ECU, sensor or etc., turn the ignition switch OFF.

Symptom

Suspected Area

See page

ABS does not operate

Only when 1 to

4 are all normal but problem still occurs,

replace skid control ECU
1. Check DTC reconfirming that normal code is output

2. IG power source circuit and ground circuit

3. Speed sensor circuit

4. Check brake actuator with a hand-held tester

If abnormal, check hydraulic circuit for leakage

05-239

05-265

05-251

05-255

32-43

ABS does not operate efficiently

Only when 1 to 5 are all normal but problem still occurs,
replace skid control ECU
1. Check DTC reconfirming that normal code is output

2. IG power source circuit and ground circuit

3. Speed sensor circuit

4. Stop light switch circuit

5. Check brake actuator with a hand-held tester

If abnormal, check hydraulic circuit for leakage

05-239

05-265

05-251

05-255

05-268

32-43

ABS warning light is abnormal

1. ABS warning light circuit

2. Skid control ECU

05-275

05-277

Brake warning light is abnormal

1. Brake warning light circuit

2. Skid control ECU

05-278

DTC check

Only when 1 and 2 are all normal and problem still occurs,
replace skid control ECU
1. ABS warning light circuit

2. Tc terminal circuit

05-275

05-277

05-280

Speed sensor signal check is impossible

1. Ts terminal circuit

2. Skid control ECU

05-282

BR3583
BR3582

F00010

Rotor

+V

Speed Sensor

Magnet

Coil

N

S

To ECU

Low Speed

High Speed

-V

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

05-251

404

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DTC

C0200/31 RIGHT FRONT SPEED SENSOR CIRCUIT

DTC

C0205/32 LEFT FRONT SPEED SENSOR CIRCUIT

DTC

C1235/35 FOREIGN MATTER IS ATTACHED ON TIP OF

RIGHT FRONT SENSOR

DTC

C1236/36 FOREIGN MATTER IS ATTACHED ON TIP OF

LEFT FRONT SENSOR

CIRCUIT DESCRIPTION

The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used for control
of the ABS control 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

C0200/31

C0205/32

Detection of any of conditions from 1. to 3.:

1. With vehicle speed at 10 km/h or more, sensor signal

circuit of faulty wheel is open or short for 15 sec. or

longer.

2. Momentary interruption of sensor signal of faulty wheel

has occurred 7 times or more.

3. Sensor signal circuit is open for 0.5 sec. or longer.

Right front, left front speed sensor

Speed sensor circuit

Sensor installation

Sensor rotor

C1235 / 35

C1236 / 36

Continuous noise occurs in to the speed sensor
signals with the vehicle speed at 20 km/h (12 mph)
or more continues for 5 sec or more.

Right front, left front speed sensor

Speed sensor rotor

HINT:
DTC No. C0200/31, C1235/35 is for the right front speed sensor.
DTC No. C0205/32, C1236/36 is for the left front speed sensor.

055XM-02

F40884

W

B

BR

Y

31
S1

9

8

FR+

FR-

FL+

FL-

1

2

Skid Control ECU with Actuator

A7
ABS Speed Sensor
Front RH

A6
ABS Speed Sensor
Front LH

1

2

30

S1

S1

S1

05-252

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

405

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using the hand-held tester and start from step 2 in case of not
using hand-held tester.

1

READ VALUE OF HAND-HELD TESTER(SPEED SENSOR OUTPUT VALUE)

(a)

Select the item ”WHEEL SPEED FL (FR)” in the DATA LIST and read its value displayed on the hand-
held tester.

(b)

Check that there is no difference between the speed value output from the speed sensor displayed
on the hand-held tester and the speed value displayed on the speedometer when driving the vehicle.
OK:
There is almost no difference from the displayed speed value.

HINT:
There is tolerance of

±

10 % in the speedometer indication.

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NG