Lexus ES300 (2002 year). Manual — part 319

W04200

Normal Signal Waveform

1 V / Division

2 m/s / Division

GND

F10178

OK

NG

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

05-257

410

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

3

CHECK HARNESS AND CONNECTOR(SKID CONTROL SENSOR - BRAKE
ACTUATOR ASSEMBLY)(See page

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

4

INSPECT SENSOR AND SENSOR ROTOR SERRATIONS

(REFERENCE) INSPECTION USING OSCILLOSCOPE

(a)

Connect the oscilloscope to the terminals RR+ - RR- or
RL+ - RL- of the skid control ECU.

(b)

Drive the vehicle with about 20 km/h (12 mph), and check
the signal waveform.

HINT:

As the vehicle speed (rpm of the wheels) 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 BRAKE ACTUATOR
ASSY

NG

5

INSPECT SKID CONTROL SENSOR INSTALLATION

(a)

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

NG

REPLACE SKID CONTROL SENSOR

NOTICE:
Check the speed sensor signal last (See page

05-239

).

OK

05-258

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

411

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

6

INSPECT SPEED SENSOR ROTOR AND SENSOR TIP

OK

CHECK AND REPLACE BRAKE ACTUATOR
ASSY

NOTICE:
Check the speed sensor signal last (See page

05-239

).

NG

CLEAN OR REPLACE SPEED SENSOR AND SENSOR ROTOR

056CG-01

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

05-455

608

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

AIR CONDITIONING SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

1

VEHICLE BROUGHT TO WORK SHOP

2

CUSTOMER PROBLEM ANALYSIS (See page

05-457

)

3

CHECK AND CLEAR DTC (See page

05-458

)

4

PROBLEM SYMPTOM CONFIRMATION

SYMPTOM OCCUR (GO TO STEP 6)

SYMPTOM DOES NOT OCCUR (GO TO
STEP 5)

5

SYMPTOM SIMULATION (See page

01-21

)

6

DTC CHECK (See page

05-458

)

MALFUNCTION CODE (GO TO STEP 7)

NORMAL CODE (GO TO STEP 8)

7

DTC CHART (See page

05-461

)

GO TO STEP 10

8

PROBLEM SYMPTOMS TABLE (See page

05-468

)

9

ACTUATOR CHECK (See page

01-21

)

05-456

-

DIAGNOSTICS

AIR CONDITIONING SYSTEM

609

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

10

CIRCUIT INSPECTION (See page

05-470

-

05-540

)

11

IDENTIFICATION OF PROBLEM

12

PARTS INSPECTION

13

REPAIR

14

CONFIRMATION TEST

15

END