LEXUS LS430 2003 Factory Manual PDF

Fig. 44: Right Front Speed Sensor Circuit Description
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 45: DTC C0200/31 And DTC C0205/32 Detecting Condition And Trouble Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
DTC C0200/31 is for the right front speed sensor.
DTC C0205/32 is for the left front speed sensor.
WIRING DIAGRAM
Fig. 46: Right Front Speed Sensor Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 DESCRIPTION
OK: Go to next step
There are no momentary interruptions.
HINT:
Perform the above inspection before removing the sensor and connector.
NG: Go to step 5
OK: Go to next step
2.READ VALUE OF HAND-HELD TESTER (FRONT SPEED SENSOR)
a. Connect the hand-held tester to the DLC3.
b. Start the engine.
c. Select the DATA LIST mode on the hand-held tester.
MEASUREMENT ITEM / RANGE DESCRIPTION
d. 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: Go to next step
There is almost no difference from the displayed speed value.
HINT:
There is tolerance of 10 % in the speedometer indication.
NG: Go to step 4
ItemMeasurement Item / Range (Display)Normal Condition
SPD SEN FRFR speed sensor open detection / OPEN or
NORMALOPEN: Momentary interruption
SPD SEN FLFL speed sensor open detection / OPEN or
NORMALOPEN: Momentary interruption
ItemMeasurement Item / Range (Display)
Normal
Condition
WHEEL SPD FRWheel speed sensor (FR) reading / min.: 0 km/h (0 MPH,
max.: 326 km/h (202 MPH)Actual wheel
speed
WHEEL SPD FLWheel speed sensor (FL) reading / min.: 0 km/h (0 MPH,
max.: 326 km/h (202 MPH)Actual wheel
speed

OK: Go to next step
3.INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS
INSPECTION USING OSCILLOSCOPE
a. Connect the oscilloscope to terminal FR+ - FR- or FL+ - FL- of the skid control ECU.
b. Drive the vehicle at approximately 19 mph (30 km/h), and check the signal waveform.
OK: Go to next step
A waveform as shown in a figure should be output.
HINT:
As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the
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

Fig. 47: Normal Signal Waveform
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
4.INSPECT FRONT SPEED SENSOR

Fig. 48: Inspecting Front Speed Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Make sure that there is no looseness at the connectors' locking part and connecting part of
connector.
b. Disconnect the speed sensor connector.
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:
TESTER CONNECTION SPECIFIED CONDITION RH:
d. Measure the resistance accordin
g to the value (s) in the table below.
Tester ConnectionSpecified Condition
A8-2 (FL+) - A8-1 (FL-)0.6 to 2.5 kohms
Tester ConnectionSpecified Condition
A7-2 (FR+) - A7-1 (FR-)0.6 to 2.5 kohms

Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:
TESTER CONNECTION SPECIFIED CONDITION RH:
FRONT SPEED SENSOR SUB-WIRE HARNESS
a. Remove the front fender liner.
b. Make sure that the speed sensor connector and the wire harness side connector are securely
connected.
c. Disconnect the speed sensor connector inside the vehicle.
d. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:
TESTER CONNECTION SPECIFIED CONDITION RH:
e. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:
TESTER CONNECTION SPECIFIED CONDITION RH:
Tester ConnectionSpecified Condition
A8-2 (FL+) - Body ground1 Mohms or higher
A8-1 (FL-) - Body ground1 Mohms or higher
Tester ConnectionSpecified Condition
A7-2 (FR+) - Body ground1 Mohms or higher
A7-1 (FR-) - Body ground1 Mohms or higher
Tester ConnectionSpecified Condition
(Connector A-1) - (Connector B-1)Below 1 ohms
(Connector A-2) - (Connector B-2)Below 1 ohms
Tester ConnectionSpecified Condition
(Connector A-1) - (Connector B-1)Below 1 ohms
(Connector A-2) - (Connector B-2)Below 1 ohms
Tester ConnectionSpecified Condition
(Connector A-1) - (Connector A-2)1 Mohms or higher
Tester ConnectionSpecified Condition
(Connector A-1) - (Connector A-2)1 Mohms or higher

f. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION LH:
TESTER CONNECTION SPECIFIED CONDITION RH:
NG: REPLACE FRONT SPEED SENSOR (SEE REPLACEMENT
)
Tester ConnectionSpecified Condition
(Connector A-1) - Body ground1 Mohms or higher
(Connector A-2) - Body ground1 Mohms or higher
Tester ConnectionSpecified Condition
(Connector A-1) - Body ground1 Mohms or higher
(Connector A-2) - Body ground1 Mohms or higher

Fig. 49: Identifying Speed Sensor Connector And Wire Harness Side Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
5.CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU)
Fig. 50: Identifying Skid Control ECU Connector And Front Speed Sensor Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the skid control ECU connector and the front speed sensor connector.