Lexus ES300 (2002 year). Manual — part 349

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-195

348

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(5)

Remove the SST from the DLC3.

SST

09843-18040

HINT:
Disconnecting the battery cable during repairs will not erase the
DTC in the ECU.
(e)

In case of using hand-held tester:
Clear the DTC.
(1)

Hook up the hand-held tester to the DLC3.

(2)

Turn the ignition switch to ON.

(3)

Operate the hand-held tester to erase the codes.

HINT:
Please refer to the hand-held tester operator’s manual for fur-
ther details.

2.

DATA LIST

HINT:
IG must be turned ON to observe data suing a hand-held tester. The vehicle is considered to be placed on
a flat level surface.

Item

Measurement Item / Range (Dis-
play)

Normal Condition

Diagnostic Note

IG VOLTAGE

ECU power supply voltage / min.:
0 V, max.: 25.5 V

Actual ECU power supply voltage:
10 - 14 V

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STEERING ANGLE

Steering angle sensor reading /
min.: -73726 deg, max. 73728 deg

Actual steering angle
Left turn: reading increases
Right turn: reading decreases

Zero point is set at the point when
battery is connected

ENGINE SPD

Cam position sensor reading /
min.: 0 rpm, max.: 25500 rpm

Actual engine speed

Speed indicated on combination
meter

STOP LIGHT SW

Stop light switch / ON or OFF

ON: Brake pedal depressed
OFF: Brake pedal released

-

DAMPER SW2

Damper switch2 / ON or OFF

(SW1 & SW2 condition)
ON & OFF: COMFORT
ON & ON: SEMI COMFORT

-

DAMPER SW1

Damper switch1 / ON or OFF

ON & ON: SEMI-COMFORT
OFF & ON: SEMI-SPORT
OFF & OFF: SPORT

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TS

TS terminal / ON or OFF

ON: During test mode
OFF: Normal mode

-

TC

TC terminal / ON or OFF

ON: DTC recorded
OFF: No DTC recorded

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G (UP & DOWN) FR

G (up & down) FR sensor reading
/ min.: -1045267 mm/s

2

, max.:

1045299 mm/s

2

0

0.1 G at still condition

Reading changes when vehicle
(FR) is bounced

G (UP & DOWN) FL

G (up & down) FL sensor reading /
min.: -1045267 mm/s

2

, max.:

1045299 mm/s

2

0

0.1 G at still condition

Reading changes when vehicle
(FL) is bounced

G (UP & DOWN) R

G (up & down) rear sensor reading
/ min.: -1045267 mm/s

2

, max.:

1045299 mm/s

2

0

0.1 G at still condition

Reading changes when vehicle
(rear) is bounced

DAMPER STEP FR

Damper step (FR) / min.: 0 step,
max.: 255 step

Min.: 0 step, max.: 16 step

-

DAMPER STEP FL

Damper step (FL) / min.: 0 step,
max.: 255 step

Min.: 0 step, max.: 16 step

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DAMPER STEP RR

Damper step (RR) / min.: 0 step,
max.: 255 step

Min.: 0 step, max.: 16 step

-

DAMPER STEP RL

Damper step (RL) / min.: 0 step,
max.: 255 step

Min.: 0 step, max.: 16 step

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D26296

CG

TEM

LED

Resistor

DLC3:

05-196

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

349

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

Item

Diagnostic Note

Normal Condition

Measurement Item / Range (Dis-
play)

MAX DMP STEP FR

Damper step / min.: 0 step, max.:
255 step

16 step

-

MAX DMP STEP FL

Damper step / min.: 0 step, max.:
255 step

16 step

-

MAX DMP STEP RR

Damper step / min.: 0 step, max.:
255 step

16 step

-

MAX DMP STEP RL

Damper step / min.: 0 step, max.:
255 step

16 step

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WHEEL SPD FR

Wheel speed (FR) sensor reading
/ min.: 0 km/h (0 MPH), max.: 255
km/h (158 MPH)

Actual vehicle speed

Speed indicated on speedometer

#CODES

Number of DTC recorded / min.: 0,
max.: 255

Min.: 0, max.: XX

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TEST MODE STATUS

Test mode status / NORMAL or
TEST

NORMAL: Normal mode
TEST: During test mode

-

3.

ACTIVE TEST LIST

HINT:
IG must be turned ON to proceed Active Test using a hand-held tester.

Item

Vehicle Condition / Test Details

Diagnostic Note

DAMPER STEP FR

Changes damper step / min.: 1 step, max.: 16
step

Shock absorber hardens as damper step in-
creases

DAMPER STEP FL

Changes damper step / min.: 1 step, max.: 16
step

Shock absorber hardens as damper step in-
creases

DAMPER STEP RR

Changes damper step / min.: 1 step, max.: 16
step

Shock absorber hardens as damper step in-
creases

DAMPER STEP RL

Changes damper step / min.: 1 step, max.: 16
step

Shock absorber hardens as damper step in-
creases

4.

CHECK INPUT SIGNAL (TEST MODE CHECK)

HINT:
This function checks if signals from the stop lamp switch assy
and absorber control switch assy etc. are being input normally
to the ECU.
(a)

In case of not using hand-held tester:
Check the input signal (test mode check).
(1)

Check the battery positive voltage.

Battery positive voltage:
10 - 14 V (Engine stopped)
(2)

Turn the ignition switch to OFF.

(3)

Connect the LED and resistor in series between ter-
minals TEM and CG of the DLC3.

(4)

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

C52361

DLC3:

CG

Ts

F41629

0.25 sec.

Light OFF

Light ON

0.25 sec.

Normal Code:

F41632

Repeat

Light ON

Malfunction Code (Example Code 82):

Light OFF

4.5 sec.

0.5 sec.

0.5 sec.

8

2

1.5 sec.

4.5 sec.

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

05-197

350

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(5)

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

SST

09843-18040

(6)

Start the engine.

(7)

Set each check items to the condition of operation
(B).

HINT:

The LED lights for 1 sec. before it blinks.

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

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

Check Item

Operation (A)

Operation (B)

Stop light switch signal

OFF (Brake pedal not depressed)

ON (Brake pedal depressed)

Absorber control switch signal

-

Slowly move the absorber control switch
”COMFORT”

↔

”SPORT” both ways once

Right front speed sensor signal

Vehicle speed below 20 km/h (12 mph)

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

Right front acceleration sensor signal

-

Keep the vehicle still without any vertical move-
ment for 1 second

Left front acceleration sensor signal

-

Keep the vehicle still without any vertical move-
ment for 1 second

Rear acceleration sensor signal

-

Keep the vehicle still without any vertical move-
ment for 1 second

Crankshaft Position Sensor Signal

Engine speed below 2,000 rpm or more

Engine speed 2,000 rpm or higher

(8)

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

SST

09843-18040

(9)

Check the number that the LED blinks.

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

05-198

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DIAGNOSTICS

ELECTRONIC MODULATED SUSPENSION SYSTEM

351

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

(10) With the ignition switch to OFF, disconnect the SST

from terminals Tc and CG of the DLC3.

SST

09843-18040

(11) Disconnect the SST from terminals Ts and CG of the

DLC3.

SST

09843-18040

(12) Disconnect the LED and resistor from the terminals

TEM and CG of the DLC3.

(b)

In case of using hand-held tester:
Check the input signal (test mode).
(1)

Hook up the hand-held tester to the DLC3.

(2)

Perform step 3 - (a) - (2) to (7) on the previous
page.

(3)

Read the DTC on the tester screen.

HINT:
Please refer to the hand-held tester operator’s manual for fur-
ther details.

DTC of the input signal check
If a malfunction code is displayed during the teat mode DTC check, check the circuit listed for that code. For
details of each code, turn to the page mentioned below ”DTC No.” in the DTC chart.

DTC No.

(See Page)

Detection Item

Trouble Area

C1782/82

(

05-224

)

Stop light switch circuit malfunction

Stop lamp switch assy

Stop light switch circuit

Absorber control ECU

C1787/87

(

05-227

)

Absorber control switch malfunction

Absorber control switch assy

Absorber control switch circuit

Absorber control ECU

C1791/91

(

05-205

)

Open or short circuit in right front acceleration sensor circuit

Right front acceleration sensor assy

Right front acceleration sensor circuit

Absorber control ECU

C1792/92

(

05-205

)

Open or short circuit in left front acceleration sensor circuit

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

C1793/93

(

05-205

)

Open or short circuit in rear acceleration sensor circuit

Rear acceleration sensor

Rear acceleration sensor circuit

Absorber control ECU

C1794/94

(

05-217

)

Right front speed sensor circuit malfunction

Right front speed sensor

Right front speed sensor circuit

Skid control ECU assy

Absorber control ECU

C1797/97

(

05-222

)

Engine revolution signal circuit malfunction

Crankshaft position sensor

Crankshaft position sensor circuit

ECM

Absorber control ECU