Lexus ES300 (2002 year). Service manual — part 305
F40456
NEO
F03007
(Reference)
3 - 6 V
Below 1 V
-
DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
CHECK SKID CONTROL ECU TERMINAL VOLTAGE(NEO TERMINAL)
(a)
Remove skid control ECU with connectors still con-
nected.
(b)
Turn ignition switch ON.
(c)
Measure voltage between terminal NEO of skid control
ECU and body ground for the engine conditions below.
OK:
Engine condition
Voltage
OFF (IG ON)
3 - 6 V or below 1 V
ON (Idling)
3 - 6 V
↔
below 1 V (Pulse)
NG
CHECK AND REPLACE ECM AND SKID
CONTROL ECU
OK
3
RECONFIRM DTC(See page
)
A
Malfunction Code
B
Normal Code
B
END
A
4
CHECK CONTACT CONDITION(EACH CONNECTION)
NG
CHECK AND REPAIR HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM AND SKID CONTROL ECU
055XI-02
05-246
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DIAGNOSTICS
ABS WITH EBD SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18040, connect the terminals Tc and CG of the DLC3.
If any abnormalities are not found when inspecting the parts, inspect the ECU and wire harness.
If a malfunction code is displayed during the DTC check, check the circuit listed in the code. For details
of each code, refer to the ”See page” under the respective ”DTC No.” in the following DTC chart.
DTC No.
(See Page)
Detection Item
Trouble Area
C0278/11
(
Open circuit in ABS solenoid relay circuit
Fusible link block
ABS No. 2 fuse
C0279/12
(
Short circuit in ABS solenoid relay circuit
ABS No. 2 fuse
ABS solenoid relay
ABS solenoid relay circuit
C0273/13
(
Open circuit in ABS motor relay circuit
Fusible link block
ABS No. 3 fuse
C0274/14
(
Short circuit in ABS motor relay circuit
ABS No. 3 fuse
ABS motor relay
ABS motor relay circuit
C0226/21
(
Open or short circuit in 2-position solenoid circuit for right front
wheel
Brake actuator
SFRR or SFRH circuit
C0236/22
(
Open or short circuit in 2-position solenoid circuit for left front
wheel
Brake actuator
SFLR or SFLH circuit
C0246/23
(
Open or short circuit in 2-position solenoid circuit for right rear
wheel
Brake actuator
SRRR or SRRH circuit
C0256/24
(
Open or short circuit in 2-position solenoid circuit for left rear
wheel
Brake actuator
SRLR or SRLH circuit
C0200/31
(
Right front wheel speed sensor signal malfunction
Right front, left front speed sensor
Speed sensor rotor
C0205/32
(
Left front wheel speed sensor signal malfunction
S eed sensor rotor
Speed sensor rotor installation
Each speed sensor circuit
C0210/33
(
Right rear wheel speed sensor signal malfunction
Speed sensor rotor installation
Right rear, left rear speed sensor
C0215/34
(
Left rear wheel speed sensor signal malfunction
Right rear, left rear s eed sensor
Speed sensor rotor
Each speed sensor circuit
C1235/35
(
Foreign matter is attached on the tip of the right front sensor
Right front or left front speed sensor
C1236/36
(
Foreign matter is attached on the tip of the left front sensor
Right front or left front s eed sensor
Speed sensor rotor
C1238/38
(
Foreign matter is attached on the tip of the right rear sensor
Right rear or left rear speed sensor
C1239/39
(
Foreign matter is attached on the tip of the left rear sensor
Right rear or left rear s eed sensor
Speed sensor rotor
C1241/41
(
Power source voltage down
Power source harness and connector
Battery
Charging system
Power source circuit
C1249/49
(
Open circuit in stop light switch circuit
Stop lamp switch harness and connector
Stop light bulb
Stop light switch circuit
Stop lamp switch
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DIAGNOSTICS
ABS WITH EBD SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
C1251/51
(
Pump motor is locked
ABS pump motor
Always ON
(
Malfunction in ECU or power source voltage up
Battery
Charging system
Skid control ECU
HINT:
There is a case that hand-held tester cannot be used when the ABS warning light is always ON.
DTC of speed sensor check function:
DTC No.
Detection Item
Trouble Area
C1271/71
Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Sensor rotor
C1272/72
Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Sensor rotor
C1273/73
Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Sensor rotor
C1274/74
Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Sensor rotor
C1275/75
Abnormal change in output voltage of right front speed sensor
Right front speed sensor rotor
C1276/76
Abnormal change in output voltage of left front speed sensor
Left front speed sensor rotor
C1277/77
Abnormal change in output voltage of right rear speed sensor
Right rear speed sensor rotor
C1278/78
Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor
F41984
B-R
A5
SRC1
1E
GR-R
Skid Control ECU
ABS R/B
ABS SOL Relay
ABS No.3
W
3
5
1
2
2
2
2
2
2
1
1A
1
1
1
1
2
AL
T
W-L
A5
A5
A5
A5
A5
A5
A5
A5
S5
4
S5
5
S5
2
S5
3
S8
21
S8
4
S8
5
S8
31
S8
10
S8
1
B-Y
Y-R
Y-B
L-R
Y-G
B-W
B-L
20
10
19
9
26
34
27
28
23
GR
BS
SRC2
SRM1
SRM2
SM1+
SM1-
SM2+
SM2-
Battery
FL
MAIN
B-G
SRC1
SRC2
SRM1
SRM2
SM1+
SM1-
SM2+
SM2-
R+
SR
7
ABS & Traction
Actuator
Engine Room J/B
Engine
Room R/B
B-G
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DIAGNOSTICS
ABS WITH EBD & BA & TRAC & VSC SYSTEM
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2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1225/25 SMC SOLENOID CIRCUIT
DTC
C1226/26 SRM SOLENOID CIRCUIT
DTC
C1227/27 SRC SOLENOID CIRCUIT
CIRCUIT DESCRIPTION
This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel
cylinders thus controlling the braking force.
DTC No.
DTC Detecting Condition
Trouble Area
C1225/25
Open or short circuit for SM1 or SM2 circuit continues for
0.05 sec. or more.
Brake actuator
SM1 or SM2 circuit
C1226/26
Open or short circuit for SRM1 or SRM2 circuit continues
for 0.05 sec. or more.
Brake actuator
SRM1 or SRM2 circuit
C1227/27
Open or short circuit for SRC1 or SRC2 circuit continues
for 0.05 sec. or more.
Brake actuator
SRC1 or SRC2 circuit
WIRING DIAGRAM
055VZ-02
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