Lexus ES300 (1997 year). Manual — part 374

DI0BX–01

F00076

S−17−1 Iei−23−1−A

F00041

DLC2

Tc

E

1

DLC1

E

1

Tc

R01346

Normal Code

0.25 sec.

0.25 sec.

2 sec.

ON

OFF

ON

OFF

0.5 sec.

0.5 sec.

Code 11 and 21

4 sec.

1.5 sec.

2.5 sec.

Code 11

Code 21

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–273

425

1997 LEXUS ES300 (RM511U)

PRE–CHECK

1.

DIAGNOSIS SYSTEM

(a)

INDICATOR CHECK
When the ignition switch is turned ON, check that the ABS
warning light, TRAC OFF indicator light and SLIP indica-
tor light goes on for 3 seconds.

HINT:If the indicator check result is not normal, proceed to
troubleshooting for the ABS warning light circuit, TRAC OFF in-
dicator light circuit, SLIP indicator light circuit
(See page

DI–310

,

DI–317

,

DI–320

).

(b)

DTC CHECK
(1)

Using SST, connect terminals Tc and E

1

of DLC2 or

DLC1.

SST

09843 – 18020

(2)

Turn the ignition switch ON.

(3)

Read the DTC from the ABS warning light and
TRAC OFF indicator light on the combination meter.

HINT:If no code appears, inspect the diagnostic circuit or ABS
warning light circuit, TRAC OFF indicator light circuit
(See page

DI–313

or

DI–310

,

DI–317

).

As an example, the blinking patterns for normal code and codes
11 and 21 are shown on the left.

(4)

Code are explained in the code table on page

DI–277

.

(5)

After completing the check, disconnect terminals Tc
and E

1

, and turn off the display.

If 2 or more malfunctions are indicated at the same
time the lowest numbered DTC will be displayed
1st.

S05334

LEXUS
Hand–Held Tester

DLC2

BR3890

N09348

Hand–Held Tester

Brake–Out–Box

ECU

LEXUS

LEXUS

F00007

DLC1

Ts

Tc

E

1

DI–274

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

426

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.

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

(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.

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.

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

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

DI–275

427

1997 LEXUS ES300 (RM511U)

(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–310

).

(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.

DI–276

–

DIAGNOSTICS

ABS & TRACTION CONTROL SYSTEM

428

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