Lexus ES300 (2002 year). Manual — part 345
F41637
TACH
A21
GND
F41641
GND
5 V / Division 10 ms / Division
Normal Signal Waveform
About
13 V
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
CHECK HARNESS AND CONNECTOR(ABSORBER CONTROL ECU - ECM)
(a)
Check for open and short circuit in harness and connector between terminal THCH of absorber control
and ECM (See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
2
INSPECT ABSORBER CONTROL ECU(TACH OUTPUT)
(a)
Remove the absorber control ECU with connector still
connected.
(b)
Turn the ignition switch to ON.
(c)
Connect an oscilloscope to terminals A21 - 11 (TACH)
and A22 - 14 (GND) of the absorber control ECU harness
side connector.
(d)
With the engine idling, and check the signal waveform.
OK:
Signal wave form as shown in the illustration.
HINT:
As the engine speed becomes higher, the waveform cycle is
getting shorter.
NG
CHECK AND REPLACE ECM(See page
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
F41653
STP
2
A22
G-W
2G
19
7
1
2
W
To Battery
S15
Stop Lamp Switch Assy
Driver Side J/B
Absorber Control ECU
G-W
2G
05-224
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DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
377
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1782/82 STOP LIGHT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop lamp goes on and the signal is input to the STP terminal of
absorber control ECU.
DTC No.
DTC Detecting Condition
Trouble Area
C1782/82
The signal from the stop lamp switch assy does not
change.
Stop lamp switch assy
Stop light switch circuit
Skid control ECU assy
Absorber control ECU
WIRING DIAGRAM
056AG-01
C91403
F41638
STP (+)
GND (-)
A22
C68829
F41663
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-225
378
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
CHECK STOP LAMP
(a)
Check that the stop lamp lights up when brake pedal is depressed and turns OFF when the brake pedal
is released.
NG
Go to step 3
OK
2
INSPECT ABSORBER CONTROL ECU
(a)
Remove the absorber control ECU with connectors still
connected.
(b)
Measure voltage between terminal A22 - 2 (STP) and
A22 - 14 (GND) of absorber control ECU when stop lamp
switch assy switch is ON and OFF.
OK:
Stop lamp switch assy
Voltage
ON
8 - 14
OFF
Below 1.5
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
3
INSPECT STOP LAMP SWITCH ASSY
(a)
Disconnect the stop lamp switch assy connector.
(b)
Measure the continuity between each terminal of the stop
lamp switch assy.
OK:
Terminal
Stop lamp switch assy
Specification
1 - 2
ON
Continuity
1 - 2
OFF
No continuity
3 - 4
ON
Continuity
3 - 4
OFF
No continuity
NG
REPLACE STOP LAMP SWITCH ASSY
OK
C91403
F41638
STP (+)
GND (-)
A22
05-226
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DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
379
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
INSPECT ABSORBER CONTROL ECU
(a)
Remove the absorber control ECU with connectors still
connected.
(b)
Measure voltage between terminal A22 - 2 (STP) and
A22 - 14 (GND) of absorber control ECU when stop lamp
switch assy switch is ON and OFF.
OK:
Stop lamp switch assy
Voltage
ON
8 - 14
OFF
Below 1.5
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
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