Lexus ES300 (2002 year). Service manual — part 283
F41939
Battery
24
W-B
2
+BM
GND
23
W-B
5
ABS No. 2
Engine Room R/B
S1
1G
1A
1
Engine Room J/B
EA
1
2
L
FL MAIN
B-G
Skid Control ECU with Actuator
1
Motor
Relay
GND
1
1
2
ALT
B-G
S1
S1
W-B
EB
W-B
W-B
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-261
414
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 ABS 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. ABS 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
operation of ABS control.*
1
2. Motor relay is ON driving in the midst of initial check or
in operation of ABS control, ABS ECU terminal IG1 volt-
age 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 ABS ECU.
ABS motor relay circuit
WIRING DIAGRAM
055XP-02
F13036
LOCK
(-)
(+)
23
24
2
05-262
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
415
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 the hand-held tester.
1
PERFORM ACTIVE TEST BY HAND-HELD TESTER
(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.
NG
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
OK
2
CHECK TERMINAL VOLTAGE(+BM AND GND OF SKID CONTROL ECU)
(a)
Disconnect the skid control ECU connector.
(b)
Measure the voltage between terminals 23 and 2 or 24 of
the skid control ECU connector.
OK: 11 - 14 V
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
IF THE SAME CODE IS STILL OUTPUT AFTER THE DTC IS DELETED, CHECK THE CONTACT THE
CONDITION OF EACH CONNECTION
F41938
Battery
1
+BS
Skid Control ECU with Actuator
7
S1
1E
1A
1
Engine
Room
J/B
ABS No. 3
L
B-G
Solenoid
Relay
SFLH
SRLH
SFRR
SRRR
SFLR
SRLR
SFRH
SRRH
1
2
Engine
Room
R/B
ALT
1
2
1
1
B-G
FL
MAIN
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-263
416
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 turns on.
DTC No.
DTC Detection Condition
Trouble Area
C0278/11
Condition 1. or 2. continues for 0.2 sec. or more:
1. IG1 terminal voltage of skid control ECU is 9.5 - 18.5 V,
and when the solenoid relay is ON.*
1
2. With solenoid relay ON driving, when IG terminal of skid
control ECU is less than 9.5 V.*
1
Fusible link block
ABS No. 2 fuse
ABS solenoid relay
ABS solenoid relay circuit
C0279/12
Immediately after IG switch has been turned ON, when the
solenoid relay is OFF.*
2
ABS solenoid relay circuit
*
1
Solenoid relay contact OFF condition:
All of solenoid terminal voltage is half of IG terminal voltage or less than.
*
2
Solenoid relay contact ON condition:
All of solenoid terminal voltage is half of IG terminal voltage or more.
WIRING DIAGRAM
055XQ-02
F13037
LOCK
(-)
(+)
2
24
1
05-264
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
417
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 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 should be heard.
OK
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
NG
2
CHECK TERMINAL VOLTAGE(+BS AND GND OF SKID CONTROL ECU)
(a)
Disconnect the skid control ECU connector.
(b)
Measure the voltage between terminals 1 and 2 or 24 of
the skid control ECU connector.
OK: 11 - 14 V
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
IF THE SAME CODE IS STILL OUTPUT AFTER THE DTC IS DELETED, CHECK THE CONTACT THE
CONDITION OF EACH CONNECTION
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