Lexus RX300 (MCU15). Service manual — part 249
DI–228
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DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
NG
Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI–205).
OK
Check and replace skid control ECU.
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DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–229
LEXUS RX300 (RM785E)
DTC
C0226 / 21 – C1227 / 27
ABS Solenoid Circuit
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.
DTC Detecting Condition
Trouble Area
C0226 / 21
Open or short circuit for SFRH or SFRR circuit continues
for 0.05 sec. or more. (When the solenoid is normally ON.)
S Brake actuator
S SFRH or SFRR circuit
C0236 / 22
Open or short circuit for SFLH or SFLR circuit continues for
0.05 sec. or more. (When the solenoid is normally ON.)
S Brake actuator
S SFLH or SFLR circuit
C0246 / 23
Open or short circuit for SRRH or SRRR circuit continues
for 0.05 sec. or more. (When the solenoid is normally ON.)
S Brake actuator
S SRRH or SRRR circuit
C0256 / 24
Open or short circuit for SRLH or SRLR circuit continues
for 0.05 sec. or more. (When the solenoid is normally ON.)
S Brake actuator
S SRLH or SRLR circuit
C1225 / 25
Open or short circuit for SMC1 or SMC2 circuit continues
for 0.05 sec. or more.
S Brake actuator
S SMC1 or SMC2 circuit
C1226 / 26
Open or short circuit for SMV1 or SMV2 circuit continues
for 0.05 sec. or more.
S Brake actuator
S SMV1 or SMV2 circuit
C1227 / 27
Open or short circuit for SRC1 or SRC2 circuit continues
for 0.05 sec. or more.
S Brake actuator
S SRC1 or SRC2 circuit
DI84P–01
F13425
Skid Control ECU
SFRH
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
1
2
6
ABS
AST
Battery
4
Brake Actuator
3
19
R+
SR
GR–R
2
A21
Y–G
GR
3
W–L
GR–L
R–B
10
A5
A5
G
G–B
BR–Y
L–Y
B–Y
2
2
SOL Relay
ABS
Motor Relay
A21
1
Fusible
Link Block
ABS
A7
4
A5
A5
A5
A5
A5
A5
A5
A5
A5
A6
A6
A7
A6
5
9
3
2
7
12
6
1
3
8
11
1
2
5
Y–B
B–O
V–W
BR–W
R
R–Y
8
9
7
1
16
8
21
7
15
22
3
2
4
5
6
A20
A21
A21
A21
A21
A20
A20
A21
A21
A20
A20
A20
A20
A21
A21
SFRR
SMV2
SMV1
SMC2
SMC1
SRC1
SRC2
B
R/B No. 2
2
L–Y
W
DI–230
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DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
LEXUS RX300 (RM785E)
WIRING DIAGRAM
F13410
LOCK
A5
A6
A7
4
1
2
1
2
3
5
6
12
10 9
8
7
3
11
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DIAGNOSTICS
ABS & BA & TRC & VSC SYSTEM
DI–231
LEXUS RX300 (RM785E)
INSPECTION PROCEDURE
1
Check brake actuator solenoid.
PREPARATION:
Disconnect the 3 connectors from brake actuator.
CHECK:
Check continuity between terminal A7 – 4 and terminals A5 –
1, 2, 3, 5, 6, 7, 8, 9, 10, 11 and 12, and between terminal A7 –
4 and terminals A6 – 1, 2 and 3 of brake actuator.
OK:
Continuity
HINT:
(Reference)
Resistance of each solenoid
SFRH, SFLH, SRRH, SRLH: 8.0 – 10.0 Ω
SFRR, SFLR, SRRR, SRLR: 3.0 – 5.5 Ω
SRC1, SRC2: 8.6Ω
SMC1, SMC2, SMV1, SMV2: 8.8Ω
NG
Replace brake actuator.
OK
2
Check for open and short circuit in harness and connector between skid control
ECU and brake actuator (See page IN–32).
NG
Repair or replace harness or connector.
OK
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