2003 LEXUS LS430 sensor

Fig. 11: Connecting Hand-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
MEASUREMENT ITEM / RANGE DESCRIPTION
ItemMeasurement Item / Range (Display)Normal ConditionDiagnostic Note
SPD SEN FRFR speed sensor open detection / OPEN
or NORMALOPEN: Momentary
interruption-
SPD SEN FLFL speed sensor open detection / OPEN
or NORMALOPEN: Momentary
interruption-
SPD SEN RRRR speed sensor open detection / OPEN
or NORMALOPEN: Momentary
interruption-
SPD SEN RLRL speed sensor open detection / OPEN
or NORMALOPEN: Momentary
interruption-
YAWRATE SENYaw rate sensor open detectionOPEN: Momentary
interruption-
DECELE SENG sensor open detectionOPEN: Momentary
interruption-
STEERING SENSteering sensor open detectionOPEN: Momentary
interruption-
M/C SEN 1Master Cylinder pressure sensor 1 open
detectionOPEN: Momentary
interruption-
EFI COMEFI communication open detectionOPEN: Momentary
interruption-

Fig. 12: Harness Signal Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
If the hand-held tester's status remains open, check the continuity between the ECU and the
sensors, or between ECUs.
The OPEN display on the hand-held tester remains on for 1 second after the harness signal changes
from momentary interruption (open circuit) to normal condition.
c. While observing the screen, gently jiggle the connector or wire harness between the ECU and sensors, or
between ECUs.
Result: OPEN-screen display does not change.
HINT:
The connector and/or wire harness will be in momentary interruption (open circuit) if the chart fluctuates.
Repair or replace connector and/or wire harness as one of them is fault
y.

clearing and reading the sensor calibration data are necessary.
b. Follow the chart to perform calibration.
Fig. 14: VSC Relevant Components Description

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 15: Connecting Hand
-Held Tester To DLC3 (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.CLEAR ZERO POINT CALIBRATION
a. Clearing the DTCs.
1. Connect the han
d-held tester to the DLC3.

2. Turn the ignition switch to the ON position.
3. Operate the hand-held tester to erase the codes.
HINT:
Refer to the hand-held tester operator's manual for further details.
Check if "VSC" is displayed on the multi-information display.
3.PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR AND DECELERATION
SENSOR
a. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P
position.
b. Connect the hand-held tester to the DLC3.
c. Turn the ignition switch to the ON position.
d. Operate the hand-held tester to test mode.
e. Obtain the zero point of the yaw rate sensor and deceleration sensor:
1. Keep the vehicle in the stationar
y condition on a level surface for 2 seconds or more.

Fig. 19: Identifying VSC Location
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If the indicator remains on, proceed to troubleshooting for the light circuit below.
TROUBLE AREA REFERENCE
2.SENSOR SIGNAL CHECK BY TEST MODE
HINT:
If the ignition switch is turned from ON to the ACC or LOCK position during test mode, DTC of
Trouble areaSee Procedure
ABS warning light circuitABS WARNING LIGHT CIRCUIT (REMAINS ON)
BRAKE warning light circuitBRAKE WARNING LIGHT CIRCUIT
TRAC OFF indicator light
circuitTRAC OFF INDICATOR LIGHT, TRAC OFF SWITCH
CIRCUIT
SLIP indicator light circuitSLIP INDICATOR LIGHT CIRCUIT

sensor check function will be erased.
<002700580055004c0051004a0003005700480056005700030050005200470048000f00030028002600380003005500480046005200550047005600030044004f004f0003002700370026000300520049000300560048005100560052005500030046004b00
480046004e000300490058005100460057004c005200510011[ By preforming sensor signal
check, the codes are erased if normality is confirmed. The codes left over are the codes where
abnormality was found.
a. PROCEDURES FOR TEST MODE
1. Turn the ignition switch off.
2. Connect the hand-held tester to the DLC3.
3. Check that the steering wheel is in the straight-ahead position and move the shift lever to the
P position.
4. Turn the ignition switch to the ON position.
Fig. 20: Connecting Hand
-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 21: ABS Warning Light Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. Check that the ABS warning light blinking TEST MODE and "VSC Test" is displayed on the
multi-information display.
HINT:
If the ABS warning light and VSC information do not blink, inspect the ABS warning light
circuit and VSC warning information circuit.
TROUBLE AREA REFERENCE
6. Start the engine.
b. DECELERATION SENSOR CHECK
1. Check that the ABS warning lamp is blinking in TEST MODE.
2. Keep the vehicle in the stationar
y<00030046005200510047004c0057004c00520051000300520051000300440003004f004800590048004f0003005600580055004900440046004800030049005200550003001400030056004800460052005100470003005200550003005000520055004800
110003[
Trouble areaSee Procedure
ABS warning light circuitABS WARNING LIGHT CIRCUIT (DOES NOT
LIGHT UP)
VSC warning information
circuitVSC WARNING LIGHT CIRCUIT (DOES NOT
LIGHT UP)

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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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.