Lexus ES300 (2002 year). Manual — part 308
F41241
ECU-IG
GND4
F40456
GND1
GND2
GND3
IG1
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
INSPECT FUSE(ECU-IG OF DRIVER SIDE J/B)
(a)
Remove ECU-IG fuse from the driver side J/B.
(b)
Check continuity of ECU-IG fuse.
OK: Continuity
NG
INSPECT FOR SHORT CIRCUIT IN ALL
HARNESS AND COMPONENTS CONNECTED
TO ECU-IG FUSE
OK
2
INSPECT BATTERY(TERMINAL VOLTAGE)
(a)
Check the battery positive voltage.
OK: 10 - 14 V
NG
CHECK CHARGING SYSTEM
(See page
OK
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 REPLACE SKID CONTROL ECU
ASSY
NG
05-352
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
4
CHECK CONTINUITY(SKID CONTROL ECU ASSY - BODY GROUND)
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPAIR HARNESS AND CONNECTOR
F41986
Skid Control ECU
GL1
GL2
YAW
GYAW
YSS
W
B-Y
3
Passenger Side J/B
Battery
IA
FL MAIN
3B
6
4
2R
B-G
4
2
AM1
IG1
IG1
VYS
GL1
GL2
YAW2
VYS
GYAW
5
1
2
2E
2L
2A
2A
8
2
2
8
2
1
8
5
Y
L
W
R
B
S6
S6
S6
S6
S6
S6
S7
1
1
1
2
ALT
Engine Room R/B
B-G
W-B
B-R
3B
ECU-IG
AM1
I14
Ignition SW
IG Relay
Driver Side J/B
21
22
10
1
20
3
7
W
68
27
W
(Shielded)
S6
16
YD
Y1
Yaw Rate Sensor
G
6
YD
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1243/43 MALFUNCTION IN DECELERATION SENSOR
DTC
C1245/45 MALFUNCTION IN DECELERATION SENSOR
DTC
C1336/39 ZERO POINT CALIBRATION OF
DECELERATION SENSOR UNDONE
CIRCUIT DESCRIPTION
DTC No.
DTC Detecting Condition
Trouble Area
C1243/43
While vehicle speed gets to 0 km/h (0 mph) from 30 km/h (18
mph), and the condition that GL1 and GL2 signals of ECU
terminals did not change 2 LSB or more continued in a
sequence 16 times.
Deceleration sensor
C1245/45
At the vehicle speed of 30 km/h (18 mph) or more, and the
condition that the difference between acceleration and decel-
eration values of computation from deceleration sensor and
vehicle speed becomes more than 0.35 G continues for 60
sec. or more.
Deceleration sensor
Wire harness for deceleration sensor system
C1336/39
At the initial time after replacing the computer, or after erasing
the deceleration sensor memory by operating the terminals Ts
and CG of DLC3, the ignition is turned ON and the vehicle is
driven in any mode except for the test mode.
Deceleration sensor
Deceleration sensor circuit
Zero point calibration not done
WIRING DIAGRAM
055W1-02
05-354
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
507
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
After step 1 and 2, go to step 3 in case of using the hand-held tester, and go to step 5 in case of not using
the hand-held tester.
1
PERFORM DECELERATION SENSOR ZERO POINT CALIBRATION
(See page
2
RECONFIRM DTC(See page
)
A
Malfunction Code
B
Normal Code
B
END
A
3
READ VALUE OF HAND-HELD TESTER(DECELERATION SENSOR OUTPUT
VALUE)
(a)
Select the item ”DECELERAT SEN, DECELERAT SEN2” in the DATA LIST and read its value dis-
played on the hand-held tester.
(b)
Check that the deceleration value of the deceleration sensor observed in the hand-held tester is
changing when the vehicle is tilted.
OK:
Deceleration value must be changing.
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
4
CHECK HARNESS AND CONNECTOR(YAW RATE SENSOR(DECELERATION
SENSOR) - SKID CONTROL ECU ASSY)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE YAWRATE SENSOR
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