Lexus ES300 (2002 year). Manual — part 300
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-321
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
CHECK HARNESS AND CONNECTOR(ABS & TRACTION ACTUATOR ASSY -
SKID CONTROL ECU ASSY)(See page
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
)
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
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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
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
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
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
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