Lexus ES300 (2002 year). Manual — part 344
F41651
SS2+
SS2-
A21
9
R
8
G
IF2
7
6
4
12
IG
ESS
1
2
B-R
W-B
A
J1
J/C
IB
IA
Absorber Control ECU
Steering Sensor
To Ignition SW
A21
IF2
R
G
SS2+
SS2-
W-B
W-B
J4
J/C
A
A
A
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-219
372
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1777/77 STEERING ANGLE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The steering sensor is mounted on the combination switch assy, and detects the steering wheel angle and
its direction.
DTC No.
DTC Detecting Condition
Trouble Area
C1777/77
Steering sensor system signal is abnormal.
Steering sensor
Steering angle sensor circuit
Absorber control ECU
WIRING DIAGRAM
056AE-01
C91403
F41638
+B (+)
GND (-)
A22
05-220
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
373
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 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 push the hand-held tester main switch ON.
(c)
Select the item ”STEERING ANGLE” in the DATA LIST and read its value displayed on the hand-held
tester.
(d)
Check that the steering wheel turning angle value of the steering angle position sensor displayed on
the hand-held tester is changing when turning the steering wheel.
OK:
Steering wheel turning angle value must be changing.
NG
CHECK AND REPLACE ABSORBER CONTROL
ECU(See page
OK
2
INSPECT ABSORBER CONTROL ECU
(a)
Remove the absorber control ECU with the connector still
connected.
(b)
Turn the ignition switch to ON.
(c)
Measure voltage between terminal A22 -1 (+B) and A22
- 14 (GND) of the absorber control ECU.
OK:
Voltage 10 - 14 V
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
F41640
ESS (-)
IG1 (+)
BAT (+)
C90512
ESS (-)
IG1 (+)
BAT (+)
SS2-
SS2+
F04441
(Reference)
3 ms
2,288
µ
s
104
µ
s
5 V
0 V
5 V
0 V
ÇÇ
ÇÇ
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-221
374
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(STEERING SENSOR)
(a)
Disconnect the steering sensor connector.
(b)
Turn the ignition switch ON.
(c)
Measure voltage between terminal 1 (IG1) and 2 (ESS),
2 (ESS) and 9 (BAT) of the steering sensor harness side
connector.
OK:
Voltage 10 - 14 V
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
4
INSPECT STEERING SENSOR
(a)
Disconnect the steering angle sensor connector.
(b)
Apply battery positive voltage between terminals 1 (IG1)
and 2 (ESS), 2 (ESS) and 9 (BAT).
(c)
Connect the oscilloscope to the terminals 4 (SS2+) and
12 (SS2-) of the steering angle sensor.
(d)
Turn the steering column shaft slowly and check the sig-
nal waveform.
OK:
HINT:
The above signal waveform does not repeat ON and OFF regu-
larly and this ON-OFF interval changes case by case according
to the data.
NG
REPLACE STEERING SENSOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
F41652
Absorber Control ECU
TACH
E6
ECM
B-O
11
A21
5
TACH
05-222
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
375
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1779/79 CRANKSHAFT POSITION SENSOR CIRCUIT
DTC
C1797/97 CRANKSHAFT POSITION SENSOR CIRCUIT
CIRCUIT DESCRIPTION
The absorber control ECU receives the engine speed signal from the ECM.
DTC No.
DTC Detecting Condition
Trouble Area
C1779/79
C1797/97
With engine speed is less than 2,000 rpm, or any signal is
not input at all.
Crankshaft position sensor
Crankshaft position sensor circuit
ECM
Absorber control ECU
WIRING DIAGRAM
056AF-01
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