Lexus ES300 (2002 year). Service manual — part 311
B-G
F41991
Skid Control ECU
Combination Meter
1
WA
S7
Passenger Side J/B
ABS
R-B
86
57
96
40
C7
6
3A
C7
3A
3B
3B
87
W
Driver Side J/B
From
Ignition SW
B-Y
IG1 Relay
2
8
2E
2A
IA
5
1
1
8
From Battery
2
GAUGE1
2M
2R
W-B
W
W
W
3
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-363
516
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
AlwaysON MALFUNCTION IN ABS ECU
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
Always ON
Either of the following 1., 2. or 3. is detected:
1. Voltage of ECU terminal IG1 remains at more than 17 V.
2. The ECU connectors are off from the ECU.
3. There is a malfunction in the ECU internal circuit.
Battery
Charging system
Power source circuit
Skid control ECU
HINT:
There is a case that hand-held tester cannot be used when ECU is abnormal.
WIRING DIAGRAM
INSPECTION PROCEDURE
1
CHECK SKID CONTROL ECU CONNECTOR SECURELY CONNECTED
NG
CONNECT CONNECTORS
OK
2
RECONFIRM DTC(See page
)
A
Normal Code
B
Malfunction Code
B
REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
A
0529X-03
GND4
F40456
GND1
GND2
GND3
IG1
05-364
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
517
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK VOLTAGE OF ECU IG POWER SOURCE
IN CASE OF USING THE HAND-HELD TESTER:
(a)
Select the item ”IG VOLTAGE” in the DATA LIST and red its value displayed on the hand-held tester.
(b)
Check the voltage condition output from the ECU displayed on the hand-held tester.
OK: ”Normal” is displayed.
IN CASE OF NOT USING THE HAND-HELD TESTER:
(a)
Remove the skid control ECU with connectors still con-
nected.
(b)
Turn the ignition switch ON, measure voltage between
terminals IG1 and GND of skid control ECU connector.
OK: 10 - 14 V
OK
CHECK AND REPAIR HARNESS AND
CONNECTOR
NG
4
INSPECT BATTERY(TERMINAL VOLTAGE)
(a)
Check the battery positive voltage.
OK: 10 - 14 V
NG
CHECK AND REPLACE CHARGING SYSTEM
OK
5
CHECK HARNESS AND CONNECTOR(BATTERY - SKID CONTROL ECU ASSY)
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-365
518
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
6
CHECK ABS WARNING LIGHT
IN CASE OF USING THE HAND-HELD TESTER:
(a)
Select the item ”ABS WARN LIGHT” in the ACTIVE TEST and operate the ABS warning light on the
hand-held tester.
(b)
Check that ”ON” and ”OFF” of the ABS warning light can be shown on the combination meter by the
hand-held tester.
IN CASE OF NOT USING THE HAND-HELD TESTER:
(a)
Turn the ignition switch OFF and disconnect the connector from the skid control ECU.
(b)
Turn the ignition switch ON.
(c)
Check the ABS warning light turns off.
OK
CHECK AND REPLACE COMPUTER ASSY,
SKID CONTROL
NG
CHECK AND REPLACE METER ASSY, COMBINATION
F41992
Skid Control ECU
Combination Meter
14
VSCW
S7
Engine Room J/B
Driver Side J/B
From
Ignition SW
R-L
B-R
B-O
IG2
8
5
2O
8
2G
1C
C8
13
7
1C
C7
39
W
B-O
VSC
IF6
8
B-R
05-366
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
519
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
AlwaysON MALFUNCTION IN ECU(VSC WARNING
LIGHT)
CIRCUIT DESCRIPTION
If the ECU stores DTC, the VSC warning light lights on the combination meter.
DTC No.
DTC Detecting Condition
Trouble Area
Always ON
Malfunction in skid control EU
Battery
IC regulator
Power source circuit
Skid control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1
RECONFIRM DTC(See page
)
A
Normal Code
B
Malfunction Code
B
REPAIR CIRCUIT INDICATED BY OUTPUT
CODE
A
2
CHECK VSC WARNING LIGHT
(a)
Check VSC warning light go off.
YES
CHECK AND REPAIR HARNESS AND
CONNECTOR
NO
055W3-02
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст