Lexus ES300 (2002 year). Manual — part 307
F43003
1 (+)
11 (-)
9 (+)
2 (-)
3 (+)
F04441
(Reference)
3 ms
2,288
µ
s
104
µ
s
5 V
0 V
5 V
0 V
ÇÇ
ÇÇ
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
INSPECT STEERING SENSOR
(a)
Remove the steering wheel and column lower cover (See
page
).
(b)
Disconnect the steering angle sensor connector.
(c)
Apply battery positive voltage between terminals 1 and 2,
2 and 9.
(d)
Connect the oscilloscope to the terminals 3 and 11 of the
steering angle sensor.
(e)
Turn the steering column shaft slowly and check the sig-
nal waveform.
OK:
HINT:
The above signal waveform does not repeat ON and OFF regu-
larly and this ON-OFF interval changes case by case according
to the data.
NG
REPLACE STEERING SENSOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
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
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
501
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1232/32 MALFUNCTION IN DECELERATION SENSOR
DTC
C1244/44 OPEN OR SHORT IN DECELERATION
SENSOR CIRCUIT
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS & BA & TRAC & VSC
control. If the sensor functions abnormally, the ABS warning light comes on.
DTC No.
DTC Detecting Condition
Trouble Area
C1232/32
While vehicle speed becomes 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 40 mV or less continued in a
sequence 16 times.
C1244/44
Either of the following 1., 2., 3. or 4. is detected:
1. The condition that ECU terminals GL1 and GL2 values
are 1.5G or less or 1.5G or more continues for 1.2 sec.
or more.
2. The condition that the deceleration sensor terminal VGS
voltage is 4.4 V or less or 5.6 G or more continues for
1.2 sec. or more.
3. At the vehicle speed of 0 km (0 mph), after the differ-
ence of output value between deceleration sensor termi-
nals GL1 and GL2 becomes 0.6 G or more, and the
condition that does not become 0.4 G or less continues
for 60 sec. or more.
4. Deceleration sensor signal momentary open occurs for
7 times or more.
Deceleration sensor
Deceleration sensor circuit
WIRING DIAGRAM
052B3-03
F12707
GL1
GYAW
GL2
VYS
Forward
Rearward
Front
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
1
CHECK HARNESS AND CONNECTOR(YAW RATE SENSOR (DECELERATION
SENSOR) - SKID CONTROL ECU ASS)(See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
2
INSPECT YAWRATE SENSOR(DECELERATION SENSOR)
(a)
Remove the consol box.
(b)
Connect 3 dry batteries of 1.5 V in series.
(c)
Connect VYS terminal to the batteries’ positive (+) termi-
nal, and GYAW terminal to the batteries’ negative (-) ter-
minal. Apply about 4.5 V between VYS and GYAW termi-
nals.
NOTICE:
Do not apply voltage of 6 V or more to terminals VYS and
GYAW.
(d)
Check the output voltage of GL1 and GL2 terminals when
the sensor is tilted forward and rearward.
OK:
Symbols
Condition
Standard Value
GL1
Horizontal
About 2.3 V
GL1
Lean forward
0.4 V - about 2.3 V
GL1
Lean rearward
About 2.3 V - 4.1 V
GL2
Horizontal
About 2.3 V
GL2
Lean forward
About 2.3 V - 4.1 V
GL2
Lean rearward
0.4 V - about 2.3 V
HINT:
If the sensor is tilted too much it may show the wrong val-
ue.
If dropped, the sensor should be replaced with a new one.
The sensor removed from the vehicle should not be
placed upside down.
NG
REPLACE YAWRATE SENSOR
OK
CHECK AND REPLACE SKID CONTROL ECU ASSY
F41987
Skid Control ECU
Passenger Side J/B
Battery
2
S8
GND1
3
15
22
IA
Engine Room R/B
Driver Side J/B
I14
Ignition SW
27
7
S7
FL MAIN
B-R
IG1
AM1
IG1
3
W-B
ALT
B-G
4
W
1
2
5
2
S5
S5
S8
GND2
GND3
GND4
6
2L
8
2A
2
2
2E
8
2R
2A
AM1
ECU-IG
IG Relay
B-Y
B-G
W-B
1
1
W-B
W-B
W-B
3B
68
3B
2
1
W
ED
EA
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1241/41 LOW BATTERY POSITIVE VOLTAGE OR
ABNORMALLY HIGH BATTERY POSITIVE
VOLTAGE
CIRCUIT DESCRIPTION
DTC No.
DTC Detection Condition
Trouble Area
C1241/41
Condition 1. or 2. is detected:
1. Vehicle speed is at 3 km/h (1.9 mph) or more and ECU
terminal IG1 voltage is 9.5 V or less, which continues for
10 sec. or more
2. When IG1 terminal voltage is less than 9.5 V, there is
open circuit in the motor relay or
in the solenoid relay, or
the solenoid circuit malfunction.
Power source harness and connector
Battery
Charging system
Power source circuit
WIRING DIAGRAM
055W0-02
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