Lexus ES300 (2002 year). Manual - part 301

F41242

ABS No. 2

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-325

478

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

5

INSPECT FUSE(ABS NO.2 OF ENGINE ROOM J/B)

(a)

Remove ABS No. 2 fuse from the engine room J/B.

(b)

Check continuity of fuse.
OK: Continuity

OK

REPAIR OR REPLACE HARNESS AND
CONNECTOR

NG

REPLACE FUSE

05-326

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

479

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C0278/11 OPEN CIRCUIT IN ABS SOLENOID RELAY

CIRCUIT

DTC

C0279/12 SHORT CIRCUIT IN ABS SOLENOID RELAY

CIRCUIT

CIRCUIT DESCRIPTION

This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.

DTC No.

DTC Detecting Condition

Trouble Area

C0278/11

Conditions 1. and 2. continue for 0.2 sec. or more:

1. ECU terminal IG1 voltage is 9.5 V to 17.0 V and the

solenoid relay is ON, however, the contact point of the

solenoid relay is OFF.

2. With solenoid relay ON, ECU terminal IG1voltage 

becomes 9.5 V or less and the contact point of the sole-

noid relay does not become ON.

ABS SOL relay

ABS SOL relay circuit

C0279/12

Immediately after ECU terminal IG1 becomes ON, and

solenoid relay is OFF, however, when the condition that 

the solenoid relay due to the contact point is ON continues

for 0.2 sec. or more.

055VW-02

F41980

ABS R/B

ABS SOL Relay

ABS No. 3

ALT

Battery

AST

6

R+

1

SR

10

2

3

1A

1

1E

7

1

2

1

2

W

1

Engine Room R/B

B-G

2

2

2

2

5

1

W

BS

GR-R

GR

W-L

23

24

A5 
ABS & Traction Actuator

ABS No. 4

1

2

2

2

R

FL MAIN

S5

S8

S8

Skid Control ECU

W-G

1

B-G

Engine Room J/B

AST

-

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-327

480

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:
Start the inspection from step 1 in case of using hand-held tester and start from step 2 in case of not using
the hand-held tester.

1

PERFORM ACTIVE TEST BY HAND-HELD TESTER(ABS SOLENOID RELAY
OPERATION)

(a)

Select the item ”ABS SOL RELAY” in the ACTIVE TEST and operate the ABS solenoid relay on the
hand-held tester.

(b)

Check the operation sound of the ABS solenoid relay when operating it with the hand-held tester.
OK: The operation sound of the ABS solenoid relay should be heard.

OK

Go to step 4

NG

F41243

ABS Solenoid Relay

ABS R/B

F09760

5

Continuity

Open

3

2

1

2

5

1

3

Continuity

2

1

3

5

4

05-328

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

481

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

2

CHECK TERMINAL VOLTAGE(ABS SOLENOID RELAY 5 TERMINAL OF ABS R/B)

(a)

Remove the ABS solenoid relay from ABS R/B .

(b)

Measure the voltage between terminal 5 of ABS R/B (for
ABS solenoid relay) and body ground.
OK: 10 - 14 V

NG

Go to step 7

OK

3

INSPECT ABS SOLENOIDO RELAY

(a)

Check continuity between each terminal of ABS SOL
relay.
OK:

Terminals 1 and 2

Continuity (Reference value 62 

Ω

)

Terminals 3 and 5

Open

(b)

Apply battery positive voltage between terminals 1 and 2.

(c)

Check continuity between terminals 3 and 5 of ABS SOL
relay.
OK:

Terminals 3 and 5

Continuity

NG

REPLACE ABS SOLENOIDO RELAY

OK