Lexus ES300 (2002 year). Manual — part 352

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

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2002 LEXUS ES300 REPAIR MANUAL (RM911U)

INSPECTION PROCEDURE

HINT:
Start the inspection from the step 1 in case of using hand-held tester and start from step 2 (right front accel-
eration sensor assy) or step 3 (rear acceleration sensor) in case of not using hand-held tester.

1

READ VALUE OF HAND-HELD TESTER

(a)

Connect the hand-held tester to the DLC3.

(b)

Turn the ignition switch to ON and turn the hand-held tester main switch ON.

(c)

Select the item ”G (UP & DOWN) FR (R)” in the DATA LIST and read its value displayed on the hand-
held tester.

(d)

Check that the acceleration value of the acceleration sensor observed in the hand-held tester is
changing when the vehicle is bounced.
OK:
Acceleration value must be changing.

HINT:

For the right front acceleration sensor assy failure, go to step (A).

For the rear acceleration sensor failure, go to step (B).

NG(A)

Go to step 2

NG(B)

Go to step 3

OK

CHECK AND REPLACE ABSORBER CONTROL ECU(See page

01-31

)

C90513

C90514

F41634

GL1 (+)

(+)

GGND (-)

VGS

(-)

Upside

Downside

Right Front Acceleration Sensor Assy:

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ELECTRONIC MODULATED SUSPENSION SYSTEM

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2002 LEXUS ES300 REPAIR MANUAL (RM911U)

2

INSPECT ACCELERATION SENSOR ASSY(RIGHT FRONT)

(a)

Remove the right front acceleration sensor assy.

(b)

Connect 3 dry batteries of 1.5 V in series.

(c)

Connect the terminal 1 (VGS) to the batteries’ positive (+)
terminal, and terminal 2 (GGND) to the batteries’ negative
(-) terminal, then apply voltage of approximately 4.5 V be-
tween terminals 2 (GGND) and 3 (GL1) for the following
conditions.
OK:

Sensor condition

Voltage

Sensor stationary

Approx. 2.3 V

Sensor vibrating vertically

Change between approx. 1.0 - 4.0 V

NOTICE:

Do not apply more than a voltage of 6 V.

Do not drop the acceleration sensor assy. If it is
dropped, replace it with a new one.

The acceleration sensor assy removed from the ve-
hicle must not be placed upside down.

HINT:
When the acceleration sensor assy is tilted, it may output a dif-
ferent value.

OK

Go to step 4

NG

REPLACE ACCELERATION SENSOR ASSY

1

2

3

C91693

C65181

F41635

GL1 (+)

(+)

GGND (-)

VGS

(-)

Upside

Downside

Rear Acceleration Sensor:

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

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2002 LEXUS ES300 REPAIR MANUAL (RM911U)

3

INSPECT ACCELERATION SENSOR(REAR)

(a)

Remove the rear acceleration sensor.

(b)

Connect 3 dry batteries of 1.5 V in series.

(c)

Connect the terminal 3 (VGS) to the batteries’ positive (+)
terminal, and terminal 2 (GGND) to the batteries’ negative
(-) terminal, then apply voltage of approximately 4.5 V be-
tween terminals 1 (GL1) and 2 (GGND) for the following
conditions.
OK:

Sensor condition

Voltage

Sensor stationary

Approx. 2.3 V

Sensor vibrating vertically

Change between approx. 1.0 - 4.0 V

NOTICE:

Do not apply more than a voltage of 6 V.

Do not drop the acceleration sensor. If it is dropped,
replace it with a new one.

The acceleration sensor removed from the vehicle
must not be placed upside down.

HINT:
When the acceleration sensor is tilted, it may output the differ-
ent value.

NG

REPLACE ACCELERATION SENSOR

OK

4

CHECK HARNESS AND CONNECTOR(RIGHT FRONT(REAR) ACCELERATION
SENSOR(ASSY) - ABSORBER CONTROL ECU)

(a)

Check for open and short circuit in harness and connector between right front (rear) acceleration sen-
sor (assy) and absorber control ECU (See page

01-31

).

NG

REPAIR OR REPLACE HARNESS OR
CONNECTOR

OK

CHECK AND REPLACE ABSORBER CONTROL ECU(See page

01-31

)

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2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DTC

C1725/21 RIGHT FRONT ABSORBER CONTROL

ACTUATOR CIRCUIT

DTC

C1726/22 LEFT FRONT ABSORBER CONTROL

ACTUATOR CIRCUIT

DTC

C1727/23 RIGHT REAR ABSORBER CONTROL

ACTUATOR CIRCUIT

DTC

C1728/24 LEFT REAR ABSORBER CONTROL

ACTUATOR CIRCUIT

CIRCUIT DESCRIPTION

Absorber control actuator switches the damping force depending on the absorber control ECU signals.

DTC No.

DTC Detecting Condition

Trouble Area

C1725/21

Either of the following 1 or 2 is detected:

Right front absorber control actuator

Right front absorber control actuator circuit

Absorber control ECU

C1726/22

Either of the following 1. or 2. is detected:
1. After starting the engine, the breakage signal of absorb-

er control actuator are continuously detected for 1.0

second

Left front absorber control actuator

Left front absorber control actuator circuit

Absorber control ECU

C1727/23

second.

2. After turning ignition switch to ON, the short circuited

signal of absorber control actuator are continuously de-

tected 8 times

Right rear absorber control actuator

Right rear absorber control actuator

Absorber control ECU

C1728/24

tected 8 times.

Left rear absorber control actuator

Left rear absorber control actuator

Absorber control ECU

056AO-01