Lexus ES300 (2002 year). Manual - part 300

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-321

474

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

2

CHECK HARNESS AND CONNECTOR(ABS & TRACTION ACTUATOR  ASSY  -
SKID CONTROL ECU ASSY)(See page 

01-31

)

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 

05-288

)

A

Malfunction Code

B

Normal Code

B

END

A

5

CHECK CONTACT CONDITION(EACH CONNECTION)

NG

CHECK AND REPAIR HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE SKID CONTROL ECU ASSY

F41979

Battery

FL MAIN

Skid Control ECU

ALT

EB

ABS R/B

W-R

24

MRF

Engine Room R/B

S8

S5

1

23

14

R+

MR

MT

ABS & Traction Actuator

ABS MTR Relay

A5

A5

A5

A5

1

4

3

2

2

2

2

2

2

1

3

5

1G

1A

1

1

1

2

5

ABS
No. 2

Engine Room J/B

GR-L

W-L

GR-L

GR-R

+BM

MR

MT

GND

W-B

W-B

R-W

B-G

1

2

1

S8

S8

B-G

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

475

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

DTC

C0273/13 OPEN CIRCUIT IN ABS MOTOR RELAY

CIRCUIT

DTC

C0274/14 B+ SHORT CIRCUIT IN ABS MOTOR RELAY

CIRCUIT

CIRCUIT DESCRIPTION

The ABS motor relay supplies power to the ABS pump motor. While the ABS is activated, the ECU switches
the motor relay ON and operates the ABS pump motor.

DTC No.

DTC Detection Condition

Trouble Area

C0273/13

Condition 1. or 2. continues for 0.2 sec. or more:

1. ECU terminal IG1 voltage is 9.5 V to 18.5 V, and when

motor relay is ON in the midst of initial check or in op-

eration of ABS control.*

1

2. Motor relay is ON driving in the midst of initial check or

in operation of ABS control, ECU terminal IG1 voltage

becomes 9.5 V or less.*

2

Fusible link block

ABS No. 3 fuse

ABS motor relay

ABS motor relay circuit

C0274/14

Condition below continues for 4 sec. or more:

When the motor relay is OFF, there is open circuit in MT

terminal of ECU.

ABS motor relay circuit

WIRING DIAGRAM

055VV-02

F41243

ABS Motor Relay

5

ABS R/B

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

05-323

476

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

INSPECTION PROCEDURE

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

1

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

(a)

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

(b)

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

OK

Go to step 4

NG

2

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

(a)

Remove the ABS motor relay from ABS R/B.

(b)

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

NG

Go to step 5

OK

F09760

5

Continuity

Open

3

2

1

2

5

1

3

Continuity

2

1

3

5

4

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

477

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

3

INSPECT ABS MOTER RELAY

(a)

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

Terminals 3 and 5

Continuity

NG

REPLACE ABS MOTER RELAY

OK

4

CHECK HARNESS AND CONNECTOR(ABS MOTOR RELAY - SKID CONTROL
ECU ASSY)(See page 

01-31

)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE IF THE SAME CODE IS STILL OUTPUT AFTER THE DTC IS DELETED,
CHECK THE CONTACT THE CONDITION OF EACH CONNECTION