Lexus ES300 (1997 year). Manual — part 379

F00085

ABS & TRAC ECU

A19

A20

B

G

6

W

1

2

R

IM2

IN1

Left Front
Speed Sensor

Right Front
Speed Sensor

B

G

R

Left Rear
Speed Sensor

Right Rear
Speed Sensor

2

1

1

2

2

1

A19

A19

A19

A20

A20

A20

R

IM2

1

G

W

IN1

9

3

FR+

FL+

FL–

RR+

17

RL+

RL–

4

18

5

FR–

RR–

10

ID1

9

ID1

2

1

9

3

W

B

R

G

ABS & TRAC ECU

A19

A20

B

G

6

W

1

2

R

IM2

IN1

Left Front
Speed Sensor

Right Front
Speed Sensor

B

G

R

Left Rear
Speed Sensor

Right Rear
Speed Sensor

2

1

1

2

2

1

A19

A19

A19

A20

A20

A20

R

IM2

1

G

W

IN1

9

3

FR+

FL+

FL–

RR+

17

RL+

RL–

4

18

5

FR–

RR–

10

ID1

9

ID1

2

1

9

3

W

B

R

G

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–293

445

1997 LEXUS ES300 (RM511U)

WIRING DIAGRAM

R14205

1

2

R14213

1 2

1 2

1 2

1 2

1 2

1 2

1 2

DI–294

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

446

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Check speed sensor.

Front
PREPARATION:
(a)

Remove front fender liner.

(b)

Disconnect speed sensor connector.

CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:

Resistance: 0.6 – 2.5 k

Ω

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

Resistance: 1 M

Ω

or higher

Rear
PREPARATION:
(a)

Remove the seat cushion and seat back.

(b)

Disconnect speed sensor connector.

CHECK:
Measure resistance between terminals 1 and 2 of speed sensor
connector.
OK:

Resistance: 1.2 – 2.3 k

Ω

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

Resistance: 1 M

Ω

or higher

NG

Replace speed sensor.

NOTICE:Check the speed sensor signal last
(See page

DI–273

).

OK

BR3795

OK

NG

OK

NG

OK

NG

OK

NG

R00948

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–295

447

1997 LEXUS ES300 (RM511U)

2

Check for open and short in harness and connector between each speed sensor
and ECU (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

3

Check sensor installation.

CHECK:
Check the speed sensor installation.
OK:

The installation bolt is tightened properly and there is
no clearance between the sensor and rear axle carri-
er.

NG

Replace speed sensor.

NOTICE:Check the speed sensor signal last
(See page

DI–273

).

OK

4

Check sensor rotor and sensor tip.

Front
PREPARATION:
Remove front drive shaft (See page

SA–16

).

CHECK:
Check sensor rotor serrations.
OK:

No scratches or missing teeth or foreign objects.

PREPARATION:
Remove the front speed sensor (See page

BR–59

).

CHECK:
Check the sensor tip.
OK:

No scratches or foreign objects on the sensor tip.

R00947

DI–296

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

448

1997 LEXUS ES300 (RM511U)

Rear
PREPARATION:
Remove the axle hub (See page

SA–46

).

CHECK:
Check the sensor rotor serrations.
OK:

No scratches or missing teeth or foreign objects.

PREPARATION:
Remove the rear speed sensor (See page

BR–59

).

CHECK:
Check the sensor tip.
OK:

No scratches or foreign objects on the sensor tip.

NG

Replace speed sensor or rotor.

NOTICE:Check the speed sensor signal last
(See page

DI–273

).

OK

Check and replace ABS & TRAC ECU.