Lexus ES300 (2002 year). Manual - part 304

F13720

ON

6

1

5

F40456

GND2

YD

GND1

GND3

GND4

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-337

490

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

1

PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR
(See page 

05-288

)

2

RECONFIRM DTC(See page 

05-288

)

A

Malfunction Code

B

Normal Code

B

END

A

3

INSPECT YAWRATE SENSOR

(a)

Remove the console box then remove the yaw rate sen-
sor with the connector still connected to it.

(b)

Turn the ignition switch ON.

(c)

Measure voltage between terminals YAW2 (1) - GYAW
(5), and terminals YD (6) - GYAW (5) of the yaw rate sen-
sor.
OK:

Terminals 1 and 5

(YAW2 - GYAW)

About 2.42 - 2.58 V

terminals 6 and 5

(YD - GYAW)

About 4.5 - 5.3 V

NG

REPLACE YAWRATE SENSOR

OK

4

INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(YD TERMINAL)

(a)

Remove the skid control ECU with the connector still con-
nected to it.

(b)

Turn the ignition switch ON.

(c)

Measure voltage between terminals YD and GND  of skid
control ECU.
OK: 4.5 - 5.3 V

OK

CHECK AND REPLACE SKID CONTROL ECU
ASSY

NG

05-338

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

491

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

5

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

(a)

Check for open and short circuit in harness and connector between terminal YD of yaw rate sensor
and skid control ECU (See page 

01-31

).

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-339

492

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C1223/43 ABS CONTROL SYSTEM MALFUNCTION

CIRCUIT DESCRIPTION

DTC No.

DTC Detecting Condition

Trouble Area

C1223/43

ABS control system is abnormal.

ABS control system

INSPECTION PROCEDURE

1

CHECK DTC(See page 

05-288

)

A

Normal Code

B

Malfunction Code

B

REPAIR CIRCUIT INDICATED BY OUTPUT
CODE

A

CHECK ABS WARNING LIGHT CIRCUIT

052AZ-03

F41983

Skid Control ECU

NEO

S6

26

BR-W

ECM

E6

17

NEO

BR-W

IF4

22

05-340

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

493

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C1224/44 NE SIGNAL CIRCUIT

CIRCUIT DESCRIPTION

The skid control ECU receives engine revolution speed signals (NE signals) from the ECM.

DTC No.

DTC Detecting Condition

Trouble Area

C1224/44

When any of the following 1. through 2. is detected:

1. At vehicle speed of 30 km/h (19 mph) or more, and

when data received from the ECM is in normal condition,

and open or short circuit for engine revolution signal

circuit continues for 10 sec. or more.

2. While TRAC is operating, the conditions that open or

short circuit in engine revolution signal circuit is de-

tected, main throttle opening degree is 0 and IDL switch

is OFF continue for 0.24 sec. or more.

NEO circuit

ECM

Skid control ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

1

CHECK HARNESS AND CONNECTOR(TERMINAL NEO OF SKID CONTROL ECU
ASSY - ECM)(See page 

01-31

)

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

0529M-03