actuator LEXUS LS430 2003 Factory User Guide

There is no clearance between the sensor and the front steering knuckle.
NG: REPLACE FRONT SPEED SENSOR
Fig. 52: Inspecting Front Speed Sensor Gap

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OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION

fluctuation in the output voltage becomes greater.
When noise is identified in the waveform on the oscilloscope, error signals are generated due to the
speed sensor rotor's scratches, looseness or foreign matter attached to it.
NG: Go to step 7
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
4.INSPECT REAR SPEED SENSOR
Fig. 56: Inspecting Rear Speed Sensor

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a. Remove the rear seat cushion and seatback.
b. Make sure that the speed sensor connector and the wire harness side connector are securely
connected.
c. Disconnect the speed sensor connector.
d. Measure the resistance accordin
g to the value (s) in the table below.

OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT )
7.INSPECT REAR SPEED SENSOR INSTALLATION
Fig. 59: Inspecting Rear Speed Sensor Gap

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a. Check the sensor installation.
OK: Go to next step
There is no clearance between the sensor and rear axle carrier.
The installation bolt is tightened properly.
Torque: 8.0 N.m (82 kgf.cm, 71 in..lbf)

NG: REPLACE REAR SPEED SENSOR
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
<0037004b004c0056000300560052004f004800510052004c00470003005700580055005100560003005200510003005a004b0048005100030056004c004a00510044004f0056000300440055004800030055004800460048004c0059004800470003004900
550052005000030057004b0048000300280026003800030044[nd controls the pressure acting on the wheel
c
ylinders to control the braking force.

Fig. 61: SFL Solenoid Wiring Diagram
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INSPECTION PROCEDURE
1.RECONFIRM DTC
HINT:
This code is detected when a problem is determined in the brake actuator assy.
The ABS solenoid circuit is in the brake actuator assy. Therefore, solenoid circuit inspection relay unit
inspection cannot be performed. Be sure to check if the DTC code is output before replacing the brake
actuator assy.
a. Clear the DTC (see DTC CHECK/CLEAR
).
b. Start the engine.
c. Drive the vehicle at the speed of 4 mph (6 km/h) or more.
d. Check that the same DTC is recorded.

OK: Go to next step
The same DTC is recorded.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The ABS motor relays consist of 2 relays are included in the engine room No.3 R/B.
The ABS cut relay is turned on after turning the ignition switch to the ON position. If the DTCs in the
ABS pump motor circuit are memorized, the ABS cut relay cuts off the power supply to the ABS motor
relay and performs the fail safe.
While any of the ABS, BA, TRAC and VSC is operating, the skid control ECU (included in the actuator)
<0057005800550051005600030057004b00480003002400250036000300500052005700520055000300550048004f0044005c0003005200510003005700520003005200530048005500440057004800030057004b0048000300440046005700580044005700
52005500030053005800500053000300500052005700520055[.
If the voltage applied to the ABS motor relays (+BM) drops below the condition that detects the DTCs
due to the shorta
ge of the battery or alternator output, the DTCs may be memorized.

VEHICLE CONDITION / TEST DETAILS DESCRIPTION
OK: Go to next step
<0037004b00480003005200530048005500440057004c0052005100030056005200580051004700030052004900030057004b0048000300240025003600030050005200570052005500030056004b00520058004f00470003004500480003004b0048004400
5500470011[
NG: Go to step 2
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
2.INSPECT FUSE (ABS2 FUSE)
a. Remove the ABS 2 fuse from fusible link block.
b. Measure the resistance according to the value (s) in the table below.
Standard:
ABS 2 FUSE DESCRIPTION
ItemVehicle Condition / Test DetailsVehicle Condition / Test Details
ABS MOT RELAYTurns ABS motor relay / ON or OFFON: Motor relay ON
ABS 2 FuseBelow 1 ohms (Continuity)

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. 73: Identifying SKID Control ECU Connector Terminals
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3.RECONFIRM DTC
HINT:
This code is detected when a problem is determined in the brake actuator assy. The ABS solenoid circuit
is in the brake actuator assy. Therefore, solenoid circuit inspection relay unit inspection cannot be
performed. Be sure to check if the DTC code is output before replacing the brake actuator assy.
a. Clear the DTC (see DTC CHECK/CLEAR
).
b. Turn the ignition switch to the ON position.
c. Check that the same DTC is recorded.
OK: Go to next step
The same DTC is recorded.
NG: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE

HINT:
It is suspect that the DTCs output was caused by the poor connection on the connector terminal.
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
If trouble occurs in the engine control system, the ECM transmits the abnormality to the skid control ECU. The
skid control ECU sets this DTC and the skid control ECU prohibits TRAC and VSC control.
DTC DETECTING CONDITION DESCRIPTION
INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION)
a. Using the hand-held tester, check for any momentary interruption in the wire harness and connector
corresponding to a DTC (see CHECK FOR INTERMITTENT PROBLEMS
).
MEASUREMENT ITEM / RANGE (DISPLAY) DESCRIPTION
OK: Go to next step
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the sensor and connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - SKID CONTROL ECU)
OK: Go to next step
2.CHECK DTC FOR ENGINE
a. Check if the normal code is recorded for en
gine control system.
DTC No.DTC Detecting ConditionTrouble Area
C1201/51At the engine speed of 500 RPM, a trouble signal in the engine
control system continues for 5 secs, or more.Engine control
system
ItemMeasurement Item / Range (Display)Normal Condition
EFI COMEFI communication open detectionOPEN: Momentary interruption