Lexus ES300 (2002 year). Manual — part 282

055XF-02

05-236

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

389

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

ABS WITH EBD SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

1

Vehicle Brought to Workshop

2

Customer Problem Analysis (See page

05-238

)

3

Check and Clear DTCs (See page

05-239

)

4

Problem Symptom Confirmation

Symptom does not occur: Go to step 5

Symptom occur: Go to step 6

5

Symptom Simulation (See page

01-21

)

6

DTC Check (See page

05-239

)

There is no output: Go to step 7

There is output: Go to step 8

7

Problem Symptoms Table (See page

05-250

)

Check for fluid leakage and Go to step 10

8

DTC Chart (See page

05-246

)

9

Circuit Inspection (See page

05-251

)

10

Identification of Problem

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

05-237

390

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

11

Repair

12

Confirmation Test

End

HINT:
Step 3, 6, 9, 12:
Diagnostic steps permitting the use of the hand-held tester.
Fail safe function:
When a failure occurs in the ABS system, the ABS warning light is turns on and the ABS operation is prohib-
ited. In addition to this, when there is a failure which disables the EBD operation, the brake warning light is
also turns on and the EBD operation is prohibited.

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

05-259

412

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

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 ABS solenoid valve goes on when signals are sent from the ECU and controls the pressure operating
the wheel cylinders, thus the braking force is controlled.

DTC No.

DTC Detection Condition

Trouble Area

C0226/21

C0236/22

1. When solenoid relay is ON and IG1 terminal voltage is

9.5 - 18.5 V, solenoid circuit is open or short for 0.05

sec. or longer

Brake actuator

SFRR, SFRH, SFLR or SFLH circuit

C0246/23

C0256/24

sec. or longer

2. 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

SRRR, SRRH, SRLR or SRLH circuit

HINT:

DTC No. C0226/21 is for right front solenoid valve.

DTC No. C0236/22 is for left front solenoid valve.

DTC No. C0246/23 is for right rear solenoid valve.

DTC No. C0256/24 is for left rear solenoid valve.

055XO-02

F41938

Battery

1

+BS

Skid Control ECU with Actuator

7

S1

1E

1A

1

Engine
Room
J/B

ABS No. 3

L

B-G

Solenoid

Relay

SFLH

SRLH

SFRR

SRRR

SFLR

SRLR

SFRH

SRRH

1

2

Engine
Room
R/B

ALT

1

2

1

1

B-G

FL
MAIN

05-260

-

DIAGNOSTICS

ABS WITH EBD SYSTEM

413

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

WIRING DIAGRAM

INSPECTION PROCEDURE

1

RECONFIRM DTC

PREPARATION:
(a)

Clear the DTC (See page

05-239

).

(b)

Turn the ignition switch OFF.

CHECK:
Turn the ignition switch ON, and check that the same DTC is stored in the memory.

NO

END

YES

REPLACE BRAKE ACTUATOR ASSY