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