Lexus ES300 (1997 year). Manual — part 355

F00007

DLC1

Ts

E1

S05334

LEXUS hand–held tester

DLC2

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–197

349

1997 LEXUS ES300 (RM511U)

(5)

Disconnect the SST from the terminals Tc and E1 of
DLC2 or DLC1.

SST

09843–18020

Confirm that the connected LED is off.
(6)

When the abnormal code is output, inspect the
function, absorber control ECU and input signal.

(c)

DAMPING FORCE CONTROLLING CONDITION
CHECK
(1)

Using SST, connect terminals Ts and E1 of DLC1
with the ignition switch OFF. (TEST mode)

SST

09843–18020

(2)

Start the engine.

In this condition, the absorber control actuator position
becomes 1 (Soft).
(3)

Starting from the above mentioned position, as the
brake pedal is depressed, the absorber control ac-
tuator position increase (1

→

2

→

3

→

... 15

→

16).

At this time, bounce the vehicle and check that the
shock absorber is becoming harder.

HINT:

To hold the shock absorber control actuator at a
specific position, adjust it to the position using the
above mentioned procedure then increase the ve-
hicle speed to over 5 km/h.
After that the shock absorber control actuator posi-
tion does not change until the ignition switch is
turned OFF.

If the absorber control actuator does not operate,
inspect the absorber control actuator circuit and ab-
sorber control ECU.

(4)

Disconnect the SST from the terminals Ts and E1 of
DLC1.

SST

09843–18020

(d)

FAIL–SAFE FUNCTION
(1)

When the short circuit of an shock absorber control
actuator is detected, the shock absorber control ac-
tuator located on the other side of the detected drive
shaft is held at step 8. The shock absorber control
actuator remains uninterrogated until the ignition
switch is OFF.

(e)

DTC CHECK BY USING LEXUS HAND–HELD TESTER
(1)

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

W03868

–

TEM

+

E1

DLC2

F00007

DLC1

Ts

E1

DI–198

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

350

1997 LEXUS ES300 (RM511U)

(2)

Monitor the ECU data by following the prompts on
the tester screen.
Please refer to the LEXUS hand–held tester opera-
tor’s manual.

LEXUS hand–held tester has a ”Snapshot” function. This
records the measured values and is effective in the diag-
nosis of intermittent problems.

(f)

DTC CLEARANCE
The diagnosis memory is erased by turning the ignition
switch off.

(g)

INPUT SIGNAL CHECK (TEST MODE CHECK)
This function check if signals from the steering sensor and
stop light switch etc. are being input normally to the ECU.
(1)

Check the battery positive voltage.
Battery positive voltage: 10 – 14 V (When stop the
engine)

(2)

Turn ignition switch off.

(3)

Connect the LED to terminals TEM and E1 of DLC2.

(4)

Set each of the check items in the table below to the
condition in Operation (A).

(5)

Using SST, connect between terminals Ts and E1 of
DLC1. (TEST mode)

SST

09843–18020

(6)

Start the engine.

(7)

Each of the check items is set to the condition in Op-
eration (B).

The LED lights for 1 sec. before it blinks.

If the operation (B) has not been tone, DTC will indi-
cate.

NOTICE:Do not turn off the ignition switch. Diagnosis code
are erased by turning the ignition switch off.

Check Item

Operation (A)

Operation (B)

Steering Sensor Signal

Steering wheel straight ahead

Steering wheel angle 36

°

degrees or larger

Vehicle Speed Sensor Signal

Vehicle speed below 12 mph (20 km/h)

Vehicle speed 12 mph (20 km/h) or higher

Stop Light Switch Signal

OFF (Brake pedal not depressed)

ON (Brake pedal depressed)

Crankshaft Position Sensor Signal

Engine speed below 2,000 rpm or more

Engine speed 2,000 rpm or higher

Absorber Control Switch Signal

–

Slowly move the absorber control switch

”COMFORT”

↔

”SPORT” both ways once

F00007 I00169

F00287

DLC1

E1

Tc

DLC2

Tc

E1

W03869

Light ON

0.25 sec.

Light OFF

0.25 sec.

Normal Code

W03882

2.5 sec.

Repeat

1

Light ON

Malfunction Code (Example Code 21, 31)

Light OFF

4.5 sec.

0.5 sec.

1.5 sec.

0.5 sec.

1

2

3

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

DI–199

351

1997 LEXUS ES300 (RM511U)

(8)

Using SST, connect terminals Tc and E1 of DLC2 or
DLC1.

SST

09843–18020

(9)

Check the number that the LED blinks.

HINT:When the code is normal, the LED come on for 0.25 sec.
and goes off for 0.25 sec. repeatedly.

(h)

DESERT FROM INPUT SIGNAL CHECK MODE
(1)

With the ignition switch off, disconnect the SST from
the terminals Ts and E1 of DLC2 or DLC1.

SST

09843–18020

DI0AE–01

DI–200

–

DIAGNOSTICS

ELECTRIC MODULATED SUSPENSION

352

1997 LEXUS ES300 (RM511U)

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during the DTC check identify the DTC code and check the circuit listed
that the code. For details for 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

21

DI–204

Open or short in front absorber control actuator circuit

Left front, right front, left rear and right rear absorber control

actuator

Sh t i

it i b t

b

b

t l

t

t

d

23

DI–204

Open or short in rear absorber control actuator circuit

Short circuit in between absorber control actuator and

absorber control ECU

Absorber control ECU

31

DI–208

Acceleration sensor signal malfunction

Absorber control ECU (Acceleration sensor is a built–in

equipment)

34

DI–209

Front speed sensor signal malfunction

Right front and right rear speed sensor

Open or short circuit in between absorber control ECU and

ABS ECU or ABS & TRAC ECU

Open or short circuit in between ABS ECU or ABS & TRAC

ECU

d ABS

d

35

DI–209

Rear speed sensor signal malfunction

ECU and ABS speed sensor

Error in other system that uses the same speed sensor

signal

ABS ECU or ABS & TRAC ECU

Absorber control ECU

36

DI–211

Steering sensor signal malfunction

Battery

Steering sensor

Open or short circuit in between absorber control ECU and

steering sensor

Absorber control ECU

41

DI–214

Crankshaft position sensor signal malfunction

Open or short circuit in between absorber control ECU and

ECM

ECM

Absorber control ECU

42

DI–216

Stop light switch signal does not input

Stop light switch

Open or short circuit in between absorber control ECU and

stop light switch

Error in other system that uses the same stop light switch

Absorber control ECU

52

DI–218

Absorber control switch signal malfunction

Absorber control switch

Open or short circuit in between absorber control switch and

absorber control ECU

Absorber control ECU

NOTICE:

DTCs 36, 42, and 52 can be detected only in the input
signal inspecting mode.

All DTCs are erased when the ignition switch is
turned off.