Lexus ES300 (2002 year). Manual — part 295
0529H-03
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
461
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
NOTICE:
When replacing skid control ECU, sensor or etc., turn the ignition switch OFF.
Symptom
Suspect Area
See page
ABS does not operate
BA does not operate
EBD does not operate
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. IG power source circuit and ground circuit
3. Speed sensor circuit
4. Check the ABS & Traction actuator with a hand-held
tester.
If abnormal, check the hydraulic circuit for leakage.
ABS does not operate efficiently
BA does not operate efficiently
EBD does not operate efficiently
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. IG power source circuit and ground circuit
3. Speed sensor circuit
4. Stop light switch circuit
5. Check the ABS & Traction actuator with a hand-held
tester.
If abnormal, check the hydraulic circuit for leakage.
ABS warning light abnormal
1. ABS warning light circuit
2. Skid control ECU
DTC of ABS check cannot be done
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. Tc terminal circuit
Sensor signal check cannot be done
1. Ts terminal circuit
2. Skid control ECU
TRAC does not operate
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. IG power source circuit and ground circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
Symptom
Suspect Area
See page
VSC does not operate
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. IG power source circuit
3. Check the hydraulic circuit for leakage.
4. Speed sensor circuit
5. Deceleration sensor circuit
6. Yaw rate sensor circuit
7. Steering sensor circuit
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SLIP indicator light abnormal
1. SLIP indicator light circuit
2. Skid control ECU
TRAC OFF indicator abnormal
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. TRAC OFF switch circuit
DTC of VSC check cannot be done
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. Tc terminal circuit
VSC warning light abnormal
If the symptoms still occur even after the following circuits
in suspect areas are inspected and proved to be normal,
replace the skid control ECU.
1. Check the DTC again and make sure that the normal
code is output.
2. VSC warning circuit
BR3583
BR3582
F00010
Rotor
+V
Speed Sensor
Magnet
Coil
N
S
To ECU
Low Speed
High Speed
-V
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
463
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C0200/31 RIGHT FRONT SPEED SENSOR CIRCUIT
DTC
C0205/32 LEFT FRONT SPEED SENSOR CIRCUIT
DTC
C1235/35 FOREIGN MATTER IS ATTACHED ON TIP OF
RIGHT FRONT SENSOR
DTC
C1236/36 FOREIGN MATTER IS ATTACHED ON TIP OF
LEFT FRONT SENSOR
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used for control
of the ABS and VSC control systems. Each of the front and rear
rotors has 48 serrations.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.
DTC Detecting Condition
Trouble Area
C0200/31
C0205/32
Detection of any of conditions 1. through 3.:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are
not input for 15 sec.
2. Momentary interruption of the speed sensor signal oc-
curs at least 7 times in the time between switching the
ignition switch ON and switching it OFF.
3. The condition that the speed sensor signal circuit is
open continues for 0.5 sec. or more.
Right front and left front speed sensor
Each speed sensor circuit
Speed sensor rotor
C1235/35
C1236/36
At the vehicle speed of 20 km/h (12 mph) or more, the
condition that noise is included in the speed sensor signal
continues for 5 sec. or more.
Right front and left front speed sensor
Speed sensor rotor
HINT:
DTC No. C0200/31 and C1235/35 is the right front speed sensor.
DTC No. C0205/32 and C1236/36 is the left front speed sensor.
055VU-02
F40884
Skid Control ECU
A6
ABS Speed Sensor
Front LH
A7
ABS Speed Sensor
Front RH
28
FL+
S8
BR
27
FL-
13
FR+
12
FR-
Y
W
B
1
2
1
2
S8
S8
S8
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
05-31 1
464
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using hand-held tester and start from step 2 in case of not using
hand-held tester.
1
READ VALUE OF HAND-HELD TESTER(SPEED SENSOR OUTPUT VALUE)
(a)
Select the item ”WHEEL SPEED FL (FR)” in the DATA LIST and read its value displayed on the hand-
held tester.
(b)
Check that there is no difference between the speed value output from the speed sensor displayed
on the hand-held tester and the speed value displayed on the speedometer when driving the vehicle.
OK: There is almost no difference from the displayed speed value.
HINT:
There is tolerance of
10 % in the speedometer indication.
OK
CHECK AND REPLACE SKID CONTROL ECU
ASSY
NG
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