Lexus ES300 (2002 year). Manual — part 285
F13041
STP
(+)
(-)
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-269
422
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
CHECK OPERATION OF STOP LIGHT
(a)
Check that stop light turns ON when the brake pedal is depressed and turns OFF when the brake pedal
is released.
NG
REPAIR STOP LIGHT SWITCH CIRCUIT
OK
2
CHECK TERMINAL VOLTAGE(STP OF SKID CONTROL ECU - BODY GROUND)
(a)
Disconnect the skid control ECU connector.
(b)
Measure the voltage between terminal STP of the skid
control ECU connector and the body ground when the
brake pedal is depressed.
OK:
Brake pedal is depressed: 10 - 14 V
Brake pedal is released: 0 V
OK
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
NG
3
CHECK HARNESS AND CONNECTOR(STOP LAMP SWITCH - SKID CONTROL
ECU)(See page
)
NG
CHECK AND REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE BRAKE ACTUATOR ASSY
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
05-270
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
423
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1251/51 PUMP MOTOR IS LOCKED/OPEN CIRCUIT
IN PUMP MOTOR GROUND
CIRCUIT DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
C1251/51
Conditions 1., 2. and 3. continue for 0.024 sec.:
1. While checking self diagnosis of ECU, after current
flows to motor for 0.3 sec. within 0.054 sec. from turning
OFF motor relay.
2. While checking self diagnosis of ECU, after current
flows to motor for 1.4 sec. within 0.054 sec. from turning
OFF motor relay
3. Motor relay contact turned OFF
ABS pump motor
WIRING DIAGRAM
055XT-02
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
05-271
424
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
PERFORM ACTIVE TEST BY HAND-HELD TESTER(ABS PUMP MOTOR
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 pump motor when operating it with the hand-held tester.
OK:
The operation sound of the ABS pump motor should be heard.
NG
CHECK AND REPLACE BRAKE ACTUATOR
ASSY
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE(See page
)
F41940
05-272
-
DIAGNOSTICS
ABS WITH EBD SYSTEM
425
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
AlwaysON MALFUNCTION IN ABS ECU
CIRCUIT DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
Always ON
Detection of any conditions in 1. and 2.:
1. Skid control ECU internal malfunction is detected
2. There is a malfunction in the ECU internal circuit
Battery
Charging system
Skid control ECU
WIRING DIAGRAM
056AL-01
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