Lexus ES300 (2002 year). Service 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
-
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
-
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
-
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
-
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
-
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
-
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.
-
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
(
Stop light switch circuit malfunction
Stop lamp switch assy
Stop light switch circuit
Absorber control ECU
C1787/87
(
Absorber control switch malfunction
Absorber control switch assy
Absorber control switch circuit
Absorber control ECU
C1791/91
(
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
(
Open or short circuit in left front acceleration sensor circuit
Absorber control ECU
(Left front acceleration is a built-in equipment)
C1793/93
(
Open or short circuit in rear acceleration sensor circuit
Rear acceleration sensor
Rear acceleration sensor circuit
Absorber control ECU
C1794/94
(
Right front speed sensor circuit malfunction
Right front speed sensor
Right front speed sensor circuit
Skid control ECU assy
Absorber control ECU
C1797/97
(
Engine revolution signal circuit malfunction
Crankshaft position sensor
Crankshaft position sensor circuit
ECM
Absorber control ECU
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