Lexus ES300 (2002 year). Manual — part 350

C52361

Ts

CG

DLC3:

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-199

352

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

5.

CHECK DAMPING FORCE CONTROLLING CONDI-
TION

(a)

In case of not using hand-held tester:
Check the damping force controlling condition.
(1)

Using SST, connect terminals Ts and CG of the
DLC3 with the ignition switch OFF (TEST mode).

SST

09843-18040

(2)

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

If the absorber control actuator does not operate, inspect
the absorber control actuator circuit and absorber control
ECU.
(4)

Disconnect the SST from terminals Ts and CG of the
DLC3.

SST

09843-18040

6.

FAIL-SAFE FUNCTION

(a)

When short circuit of the shock absorber control actuator
is detected, the shock absorber control actuator located
on the other side of the detected shock absorber is set at
step 8. The shock absorber control actuator remains at
step 8 until the ignition switch becomes OFF.

056A7-01

05-200

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

353

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

DIAGNOSTIC TROUBLE CODE CHART

HINT:

Connect the LED (10 - 20 mA) and resistor (500

Ω

to 1 k

Ω)

in series between terminals TEM and CG

of the DLC3.

Using SST 09843-18040, connect terminals Tc and CG of the DLC3.

If any abnormality is not found when the parts are inspected, inspect the absorber control ECU.

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

DTC No.

(See Page)

Detection Item

Trouble Area

C1715/15

(

05-205

)

Open or short circuit in right front acceleration sensor circuit

Right front acceleration sensor assy

Right front acceleration sensor circuit

C1716/16

(

05-205

)

Open or short circuit in left front acceleration sensor circuit

Absorber control ECU
(Left front acceleration is a built-in equipment)

C1717/17

(

05-205

)

Open or short circuit in rear acceleration sensor circuit

Rear acceleration sensor

Rear acceleration sensor circuit

C1725/21

(

05-210

)

Open or short circuit in right front absorber control actuator
circuit

Right front absorber control actuator

Right front absorber control actuator circuit

C1726/22

(

05-210

)

Open or short circuit in left front absorber control actuator cir-
cuit

Left front absorber control actuator

Left front absorber control actuator circuit

C1727/23

(

05-210

)

Open or short circuit in right rear absorber control actuator
circuit

Right rear absorber control actuator

Right rear absorber control actuator circuit

C1728/24

(

05-210

)

Open or short circuit in left rear absorber control actuator cir-
cuit

Left rear absorber control actuator

Left rear absorber control actuator circuit

C1774/74

(

05-214

)

Power voltage drop

Battery

Power source circuit

C1776/76

(

05-217

)

Right front speed sensor circuit malfunction

Right front speed sensor

Right front speed sensor circuit

Skid control ECU assy

C1777/77

(

05-219

)

Open or short circuit in steering sensor angle circuit

Steering sensor

Steering angle sensor circuit

C1779/79

(

05-222

)

Engine revolution signal circuit malfunction

Crankshaft position sensor

Crankshaft position sensor circuit

ECM

HINT:
DTCs C1715/15, C1716/16, C1717/17, C1776/76 and C1779/79 can be detected only in the input signal
inspecting mode.

056A8-01

F41631

Right Front Absorber
Control Actuator

Crankshaft Position Sensor

Right Front Speed
Sensor

Rear Acceleration Sensor

Right Rear Absorber
Control Actuator

Left Rear Absorber
Control Actuator

Left Front Absorber Control Actuator

Steering Sensor

Absorber Control ECU
(Left front acceleration is a built-in equipment

Right Front Acceleration
Sensor Assy

Absorber Control Switch Assy

ECM

Skid Control ECU Assy

DLC3

Stop Lamp Switch Assy

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-201

354

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

LOCATION

056A9-01

15

16

17

18

19

20

21

22

23

24

25

26

2

3

4

5

6

7

8

9

10

11

12

13

7

8

9

10

11

12

1

2

3

4

5

6

14

1

F41633

A21

A22

05-202

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

355

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

TERMINALS OF ECU

Symbols (Terminals No.)

Wiring Color

Condition

STD Voltage (V)

FBL+ (A21 - 2) - FBL- (A21 -

7)

L

↔

L-B

IG switch ON

Continuity (

Ω

)

FAL+ (A21 - 3) - FAL- (A21 -

1)

L-Y

↔

L-W

IG switch ON

Continuity (

Ω

)

FBR+ (A21 - 6) - FBR- (A21 -

4)

L

↔

L-B

IG switch ON

Continuity (

Ω

)

SS2- (A21 - 8) - GND (A22 -

14)

G

↔

W-B

IG switch ON and steering wheel is being turned slowly

Repeat 1.5 - 3.5

SS2+ (A21 - 9) - GND (A22 -

14)

R

↔

W-B

IG switch ON and steering wheel is being turned slowly

Repeat 1.5 - 3.5

HARD (A21 - 10) - GND (A22

- 14)

GR

↔

W-B

Vehicle stop

Pulse generation

TACH (A21 - 11) - GND (A22 -

14)

B-O

↔

W-B

Engine idling

Pulse generation

FAR+ (A21 - 12) - FAR- (A21

- 5)

L-Y

↔

LW

IG switch ON

Continuity (

Ω

)

+B (A22 - 1) - GND (A22 - 14)

B-R

↔

W-B

IG switch ON

10 - 14

STP (A22 - 2) - GND (A22 -

G W

↔

W B

Stop lamp switch assy ON

8 - 14

STP (A22 2) GND (A22

14)

G-W

↔

W-B

Stop lamp switch assy OFF

Below 1.5

SGL (A22 - 3) - GND (A22 -

14)

B-R

↔

W-B

Always

Continuity (

Ω

)

SGFL (A22 - 4) - GND (A22 -

14)

O

↔

W-B

Observe data list on hand-held tester G (UP & DOWN) FL

-

SBL (A22 - 5) - GND (A22 -

14)

V-Y

↔

W-B

IG switch ON

4.5 - 5.5

T (A22

6)

GND (A22

14)

P B

W B

IG switch ON and terminals Tc - CG connected

Below 1.0

Tc (A22 - 6) - GND (A22 - 14)

P-B

↔

W-B

IG switch ON and terminals Tc - CG not connected

10 - 14

RBL+ (A22 - 9) - RBL- (A22 -

7)

R-Y

↔

R

IG switch ON

Continuity (

Ω

)

RAL+ (A22 - 10) - RAL- (A22

- 8)

L-R

↔

R-W

IG switch ON

Continuity (

Ω

)

RBR+ (A22 - 13) - RBR- (A22

- 11)

R-Y

↔

R

IG switch ON

Continuity (

Ω

)

TEM (A22 - 15) - GND (A22 -

P

W B

IG switch ON and terminals TEM - CG connected

Below 1.0

TEM (A22 15) GND (A22

14)

P

↔

W-B

IG switch ON and terminals TEM - CG not connected

10 - 14

SGRR (A22 - 16) - GND (A22

- 14)

P-L

↔

W-B

Observe data list on hand-held tester G (UP & DOWN) R

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