2003 LEXUS LS430 Speedometer

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

corresponding to a DTC (see CHECK FOR INTERMITTENT PROBLEMS ).
MEASUREMENT ITEM / RANGE (DISPLAY) DESCRIPTION
OK: Go to next step
There are no momentary interruption.
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 (REAR 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 (DISPLAY) DESCRIPTION
d. Check that there is no difference between the speed value output from the speed sensor displayed
by 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 in the displayed speed value.
HINT:
There is tolerance of 10 % in the speedometer indication.
ItemMeasurement Item / Range (Display)Normal Condition
SPD SEN RRRR speed sensor open detection / OPEN or
NORMALOPEN: Momentary interruption
SPD SEN RLRL speed sensor open detection / OPEN or
NORMALOPEN: Momentary interruption
ItemMeasurement Item / Range (Display)
Normal
Condition
WHEEL SPD RLWheel speed sensor (RL) reading / min.: 0 km/h (0 MPH,
max.: 326 km/h (202 MPH)Actual wheel
speed
WHEEL SPD RRWheel speed sensor (RR) reading / min.: 0 km/h (0 MPH,
max.: 326 km/h (202 MPH)Actual wheel
speed

Fig. 121: DTC C1776 Detecting Condition And Trouble Area
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 122: Speed Sensor Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and turn the hand-held tester main switch on.
c. Select the item below in the DATA LIST and read its value displayed on the hand-held tester.
NORMAL CONDITION AIRSUS
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:
There is almost no difference in the displayed speed values.
ItemNormal Condition
WHEEL SPD FRActual vehicle speed

HINT:
There is tolerance of +/- 10 % in the speedometer indication.
NG: Go to step 2
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
2.CHECK DIAGNOSTIC CODE OUTPUT
a. Check if the normal system code is output in the VSC system (SEE DTC CHECK/CLEAR
).
OK:
No DTC is output in the VSC system.
NG: REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK:Go to next step
3.CHECK DIAGNOSTIC CODE OUTPUT
a. Check if the normal system code is output in the CAN communication system (SEE HOW TO
PROCEED WITH TROUBLESHOOTING ).
OK:
No DTC is output in the CAN communication system.
NG: REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The steering angle sensor signal is sent to the suspension control ECU through the CAN communication
system. When there is a communication malfunction, it will be detected by the diagnosis function.
Fig. 123: DTC C1777 Detecting Condition And Trouble Area

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

Fig. 10: Communication Signal Reference Chart BEAN (Column)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AVC-LAN:
Fig. 11: Communication Signal Reference Chart (AVC
-LAN)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.METER GAUGE AND WARNING/INDICATOR
GAUGE:
GAUGE DETAIL
WARNING/INDICATOR:
ItemDetail
SpeedometerBased on a signal received from the wheel speed sensor, the skid control ECU
calculates vehicle speed and transmits the data to the meter (Direct line).
TachometerECM transmits engine speed to the meter display (Direct line).
Water Temperature
GaugeDisplays water temperature receiving a signal from the ECM (BEAN).
Fuel GaugeReceives the fuel sender gauge signal from the luggage room J/B ECU (BEAN).

Once calibration is completed, it is not necessary to perform the above procedures unless the magnetic
field strength is drastically changed.
HINT:
Inspect the related "Fuse" and "Relay" before confirming the suspected area as shown in the charts below.
MALFUNCTION SYSTEM:
MALFUNCTION SYSTEM SYMPTOMS REFERENCE
METER GAUGES:
METER GAUGES SYMPTOMS REFERENCE
WARNING LIGHTS:
SymptomSuspected AreaSee Procedure
Entire combination meter does
not operate1. Refer to troubleshootingENTIRE COMBINATION
METER DOES NOT OPERATE
Malfunction in ODO/TRIP SW1. Refer to troubleshootingMALFUNCTION IN ODO/TRIP
SW
Operating light control rheostat
does not change light brightness1. Refer to troubleshootingOPERATING LIGHT
CONTROL RHEOSTAT DOES
NOT CHANGE LIGHT
BRIGHTNESS
SymptomSuspected AreaSee Procedures
Malfunction in speedometer1. Refer to
troubleshootingsee MALFUNCTION IN SPEEDOMETER
Malfunction in tachometer1. Refer to
troubleshootingMALFUNCTION IN TACHOMETER
Malfunction in fuel receiver
gauge1. Refer to
troubleshootingMALFUNCTION IN FUEL RECEIVER
GAUGE
Malfunction in water
temperature receiver gauge1. Refer to
troubleshootingMALFUNCTION IN WATER
TEMPERATURE RECEIVER GAUGE

WIRING DIAGRAM
Fig. 45: Speedometer Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.PERFORM ACTIVE TEST BY HAND-HELD TESTER
a. Operate the hand-held tester according to the steps on the display and select the "ACTIVE TEST".
METER:
SPEED METER ACTIVE TEST REFERENCE
OK:
Needle indication is normal.
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: GO TO NEXT STEP
2.READ VALUE OF HAND-HELD TESTER (VEHICLE SPEED SIGNAL)
a. Operate the han
d-held tester according to the steps on the display and select the "DATA LIST"
ItemTest DetailsDiagnostic
Note
SPEED
METER0 / 40(24) / 80(48) / 120(72) / 1 60(96) / 180(108) / 200(120) km/h
(mph)-

7.REPLACE DRIVER SIDE JUNCTION BLOCK
OK:
Normal operation
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: END
1.INSPECT SPEEDOMETER
a. Check the operation.
b. Using a speedometer tester, inspect the speedometer for acceptable indication error and check the
operation of the odometer.
REFERENCE: KM/H (CANADA)
SPEEDOMETER ACCEPTABLE INDICATION
REFERENCE: MPH (U.S.A)
SPEEDOMETER ACCEPTABLE INDICATION
Standard indicationAcceptable range
20 km/h18.0 to 23.0 km/h
40 km/h38.0 to 42.0 km/h
60 km/h57.0 to 61.5 km/h
80 km/h76.5 to 81.5 km/h
100 km/h96.5 to 101.5 km/h
120 km/h116.0 to 121.5 km/h
140 km/h136.0 to 142.0 km/h
160 km/h155.5 to 162.5 km/h
180 km/h175.0 to 183.0 km/h
200 km/h194.5 to 203.5 km/h
Standard indicationAcceptable range
20 mph18.5 to 21.5 mph
40 mph38.5 to 41.5 mph
60 mph59.0 to 62.5 mph
80 mph79.0 to 83.0 mph
100 mph99.0 to 104.0 mph
120 mph119.0 to 125.0 mph