Lexus ES300 (1997 year). Service manual — part 364

S05334

LEXUS
Hand–Held Tester

DLC2

BR3890

F00006

DLC1

Short Pin

N09348

Hand–Held Tester

Brake–Out–Box

ECU

LEXUS

LEXUS

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

DI–233

385

1997 LEXUS ES300 (RM511U)

(c)

DTC CHECK USING LEXUS HAND–HELD TESTER
(1)

Hook up the LEXUS hand–held tester to the DLC2.

(2)

Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the LEXUS hand–held tester opera-
tor’s manual for further details.

(d)

DTC CLEARANCE
(1)

Using SST, connect terminals Tc and E

1

of DLC2 or

DLC1 and remove the short pin from DLC1.

SST

09843 – 18020

(2)

IG switch ON.

(3)

Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 5 seconds.

(4)

Check that the warning light shows the normal
code.

(5)

Remove the SST from the terminals of DLC2 or
DLC1.

SST

09843 – 18020

(6)

Connect the short pin to DLC1.

(e)

ECU TERMINAL VALUES MEASUREMENT
USING LEXUS BREAK –OUT–BOX AND
LEXUS HAND–HELD TESTER
(1)

Hook up the LEXUS hand–held tester and
LEXUS break–out–box to the vehicle.

(2)

Read the ECU input/output values by following the
prompts on the tester screen.

HINT:LEXUS hand–held tester has a ”Snapshot” function. This
records the measured values and is effective in the diagnosis
of intermittent problems.
Please refer to the LEXUS hand–held tester/LEXUS break–
out–box operator’s manual for further details.

F00007

DLC1

Ts

Tc

E

1

BR3904

0.13 sec.

0.13 sec.

ON

OFF

BR3893

Malfunction Code (Example Code 72, 76)

7

2

6

7

ON

OFF

0.5 sec.

0.5 sec.

0.5 sec.

0.5 sec.

1.5 sec.

2.5 sec.

4 sec.

Repeat

S05334

LEXUS
Hand–Held Tester

DLC2

DI–234

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

386

1997 LEXUS ES300 (RM511U)

2.

SPEED SENSOR SIGNAL

(a)

SPEED SENSOR SIGNAL CHECK
(1)

Turn the ignition switch OFF.

(2)

Using SST, connect terminals Ts and E

1

of DLC1.

SST

09843 – 18020

(3)

Start the engine.

(4)

Check that the ABS warning light blinks.

HINT:If the ABS warning light does not blink, inspect the ABS
warning light circuit (See page

DI–262

).

(5)

Drive vehicle straight forward.

HINT:Drive vehicle faster than 45 km/h (28 mph) for several se-
conds.

(6)

Stop the vehicle.

(7)

Using SST, connect terminals Tc and E

1

of DLC1.

SST

09843 – 18020

(8)

Read the number of blinks of the ABS warning light.

HINT:See the list of DTC shown on the next page.
If every sensor is normal, a normal code is output (A cycle of
0.25 sec. ON and 0.25 sec. OFF is repeated).
If 2 or more malfunction are indicated at the same time, the low-
est numbered code will be displayed 1st.

(9)

After doing the check, disconnect the SST from ter-
minals Ts and E

1

, Tc and E

1

of DLC1, and turn igni-

tion switch OFF.

SST

09843 – 18020

(b)

DTC CHECK USING LEXUS HAND–HELD TESTER
(1)

Do step 1.

∼

6. on the previous page.

(2)

Hook up the LEXUS hand–held tester to the DLC2.

(3)

Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the LEXUS hand–held tester opera-
tor’s manual for further details.

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

DI–235

387

1997 LEXUS ES300 (RM511U)

(c)

DTC OF SPEED SENSOR CHECK FUNCTION

Code No.

Diagnosis

Trouble Area

71

Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Right front speed sensor rotor

72

Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Left front speed sensor rotor

73

Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Right rear speed sensor rotor

74

Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Left rear speed sensor rotor

75

Abnormal change in output voltage of right front speed sen-

sor

Right front speed sensor rotor

76

Abnormal change in output voltage of left front speed

sensor

Left front speed sensor rotor

77

Abnormal change in output voltage of right rear speed

sensor

Right rear speed sensor rotor

78

Abnormal change in output voltage of left rear speed sensor

Left rear speed sensor rotor

DI0BE–01

DI–236

–

DIAGNOSTICS

ANTI–LOCK BRAKE SYSTEM

388

1997 LEXUS ES300 (RM511U)

DIAGNOSTIC TROUBLE CODE CHART

HINT:Using SST 09843 –18020, connect the terminals Tc and E

1

, and remove the short pin.

If a malfunction code is displayed during the DTC check, check the circuit listed that the code. For details
of each code, turn to the page referred to under the ”See page” for respective ”DTC No.” in the DTC chart.

DTC No.

(See Page)

Detection Item

Trouble Area

11

(

DI–240

)

Open circuit in ABS solenoid relay circuit

ABS solenoid relay

12

(

DI–240

)

Short circuit in ABS solenoid relay circuit

ABS solenoid relay

ABS solenoid relay circuit

13

(

DI–243

)

Open circuit in ABS motor relay circuit

ABS motor relay

14

(

DI–243

)

Short circuit in ABS motor relay circuit

ABS motor relay

ABS motor relay circuit

21

(

DI–246

)

Open or short circuit in 2–position solenoid circuit for right front

wheel

ABS actuator

SFRR or SFRH circuit

22

(

DI–246

)

Open or short circuit in 2–position solenoid circuit for left front

wheel

ABS actuator

SFLR or SFLH circuit

23

(

DI–246

)

Open or short circuit in 2–position solenoid circuit for right rear

wheel

ABS actuator

SRRR or SRRH circuit

24

(

DI–246

)

Open or short circuit in 2–position solenoid circuit for left rear

wheel

ABS actuator

SRLR or SRLH circuit

31

(

DI–248

)

Right front wheel speed sensor signal malfunction

32

(

DI–248

)

Left front wheel speed sensor signal malfunction

Right front, left front, right rear and left rear speed sensor

E

h

d

i

it

33

(

DI–248

)

Right rear wheel speed sensor signal malfunction

Each speed sensor circuit

Speed sensor rotor

34

(

DI–248

)

Left rear wheel speed sensor signal malfunction

33, 34

(

DI–253

)

Rear speed sensor rotor faulty

Rear axle hub

Right rear, left rear speed sensor

Rear speed sensor circuit

41

(

DI–254

)

Power source voltage down

Battery

IC regulator

Power source circuit

49

(

DI–257

)

Open circuit in stop light switch circuit

Stop light switch

Stop light switch circuit

51

(

DI–259

)

Pump motor is locked

ABS pump motor

Always ON

(

DI–260

)

Malfunction in ECU

ECU

Battery