Identifying condition LEXUS LS430 2003 Factory Repair Manual

HINT:
The blinking pattern of the ABS warning lamp and the "VSC Test" display on the multi-
information do not change. When the sensor is normal and in the test mode, if the above conditions
are met, the check is completed.
Fig. 22: Identifying VSC Test Location

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c. CHECK THE MASTER CYLINDER PRESSURE SENSOR
1. Leaving the vehicle in a stationary condition engine is off and the brake pedal in a free
condition for 1 second. or more, continue to quickly depress the brake pedal with a force of
98 N (10 kgf, 22 lbf) or more for 1 second, or more.
HINT:
At this time, the ABS warnin
g light stays on for 3 seconds.

Fig. 26: Identifying VSC OK Condition
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i. DTC of TEST MODE CODE:

SST 09843-18040
2. Turn the ignition switch to the ON position.
3. Read the DTC from multi-information display on the combination meter.
HINT:
At this time, "VSC OK", is displayed when VSC system is in normal condition. If any DTC is
detected, "VSC 31", for example, will be displayed.
If there are 2 or more DTC, DTC will be displayed in ascending order of the number.
If no code appears, inspect the VSC warning information circuit and TC and CG terminal circuit.
Fig. 34: Identifying VSC Position

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TROUBLE AREA REFERENCE
Trouble AreaSee Procedure
TC and CG terminal circuitTC AND CG TERMINAL CIRCUIT

Fig. 57: Identifying Skid Control ECU Connector And Rear Speed Sensor Connector Terminals
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a. Disconnect the skid control ECU connector and the rear speed sensor connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:

NG: CHECK FOR SHORT IN ALL HARNESS AND CONNECTOR CONNECTED TO FUSE
AND REPLACE FUSE
OK: Go to next step
3.CHECK TERMINAL VOLTAGE (ABS MOTOR RELAY 5 TERMINAL OF ENGINE ROOM
NO.3 R/B)
a. Remove the ABS MTR relay from the engine room No.3 R/B.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Fig. 65: Identifying ABS MTR Relay Location
Tester ConnectionSpecified Condition
Terminals 5 - Body ground10 to 14V

Fig. 68: Identifying ABS Motor Relay Location
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Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester ConnectionSpecified Condition
S42-2 (BM) - Body ground1 Mohms or higher

Fig. 69: Identifying Skid Control ECU Connector Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The ABS solenoid relay is built in the ABS & TRACTION Actuator assy. This relay supplies power to each
ABS solenoid. If the initial check is OK, after the ignition switch is turned to the ON position, the relay stays
on.
Fig. 70: DTC C0278/11 And DTC C0279/12 Detecting Condition And Trouble Area

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WIRING DIAGRAM

Fig. 81: Identifying Yaw Rate And Deceleration Sensor Connector Terminals (1 Of 2)
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TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (GND TERMINAL)
a. Disconnect the yaw rate and deceleration sensor connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
Tester ConnectionSpecified Condition
Y1-5 (IG) - Body ground10 to 14V

TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 82: Identifying Yaw Rate And Deceleration Sensor Connector Terminals (2 Of 2)

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OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
Tester ConnectionSpecified Condition
Y1-1 (GND) - Body groundBelow 1 ohms

Fig. 87: Identifying Speed Sensor Rotor Location
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CIRCUIT DESCRIPTION
Fig. 88: DTC C1241/41 Detecting Condition And Trouble Area

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WIRING DIAGRAM