Lexus ES300 (2002 year). Manual — part 306
F07812
SM1-
SRC2
SM2-
SRC1
SM2+
SRM2
SRM1
SM1+
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT ABS & TRACTION ACTUATOR ASSY(SRM1, SRM2, SCR1, SCR2, SM1,
SM2 SOLENOID)
(a)
Disconnect the brake actuator connector.
(b)
Check continuity between terminals SM1+ - SM1-, and
terminals SM2+ - SM2- of brake actuator.
OK: Continuity
HINT:
Resistance of each solenoid: 8.1 - 9.1
Ω
(c)
Check continuity between terminal BS and terminals
SRC1, SRC2, SRM1 and SRM2 of brake actuator.
OK: Continuity
HINT:
Resistance of each solenoid
SRC1, SRC2: 8.1 - 9.1
Ω
SRM1, SRM2: 4.9 - 5.5
Ω
NG
REPLACE ABS & TRACTION ACTUATOR ASSY
OK
2
CHECK HARNESS AND CONNECTOR(ABS & TRACTION ACTUATOR ASSY -
SKID CONTROL ECU ASSY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
3
CHECK SKID CONTROL ECU TERMINAL VOLTAGE(SR TERMINAL)
(a)
Remove the skid control ECU with connectors still connected.
(b)
Turn the ignition switch ON, measure between terminal SR and GND.
OK: 1V or less
NG
CHECK AND REPAIR HARNESS AND ABS
SOLENOID RELAY
OK
4
RECONFIRM DTC(See page
)
A
Malfunction Code
B
Normal Code
B
END
A
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
5
CHECK CONTACT CONDITION(EACH CONNECTION)
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
F41985
Skid Control ECU
3
Battery
IA
FL MAIN
B-G
AM1
IG1
5
2
Engine
Room R/B
Driver Side J/B
Engine Room J/B
1
AM1
ECU-IG
ECU-B
2P
2L
2A
2A
2R
2E
2F
7
2
8
1D
1A
6
6
8
2
IF4
21
22
S8
+BI
W-R
B-Y
W
W
1
2
1
1
1
1
2
B-G
3B
3B
S7
S6
S6
S6
18
27
24
6
P
V
P
Y-R
10
9
3
D
SS1+
SS1-
+BO
TRIG
I14
Ignition SW
S9
Steering Sensor
Passenger Side J/B
A
A
W-B
W
28
68
ALT
W-B
B-G
R
W-R
2
4
SS1+
SS1-
BAT
TRIG
IG
ESS
1
2
B-R
J4
J/C
D.C.C
IG Relay
W-B
IB
A
J1
J/C
11
D
J3
J/C
W-R
B-G
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1231/31 MALFUNCTION IN STEERING ANGLE
SENSOR CIRCUIT
DTC
C1335/35 STEERING ANGLE SENSOR CIRCUIT
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1231/31
When ECU IG1 terminal voltage is 9.5 V or more, ECU
does not receive data from the steering angle sensor for 1
sec. or more.
Steering angle sensor
Steering angle sensor circuit
+BI circuit
C1335/35
Detection of either condition 1. or 2.:
1. When the ECU IG1 terminal voltage is 9.5 V or more,
data transmission from the steering angle sensor is im-
possible for 1 sec or more
Steering angle sensor
C1335/35
possible for 1 sec. or more.
2. Immediately after the terminal BAT is connected and
when IG1 terminal voltage is 9.5 V or more, open circuit
of terminal TRIG continues for 15 sec. or more.
Steering angle sensor
Steering angle sensor circuit
WIRING DIAGRM
0529N-03
F40906
ON
GND
GND
GND
GND
+B1
F43002
ON
2 (-)
9 (+)
1 (+)
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
499
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(+BI TERMINAL)
(a)
Remove the skid control ECU with the connector still con-
nected.
(b)
Turn the ignition switch ON.
(c)
Measure voltage between terminal +BI and GND of skid
control ECU and body ground.
OK: 10 - 14 V
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
2
CHECK HARNESS AND CONNECTOR(STEERING ANGLE SENSOR - SKID
CONTROL ECU ASSY)
(a)
Remove the steering wheel and column lower cover (See
page
).
(b)
Disconnect the steering sensor connector.
(c)
Turn the ignition switch ON.
(d)
Measure voltage between terminal 1 and 2, 2 and 9 of the
steering sensor harness side connector.
OK: 10 - 14 V
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
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