Spd LEXUS LS430 2003 Factory Repair Manual

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-

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

Symbols (Terminal
No.)Wiring
Color
Terminal DescriptionConditionSpecification
WFL+ (S28-3) - GND
(S30-16)LG - W-BSound signal (Front
Left)Audio system is playing-
WFR+ (S28-4) - GND
(S30-16)Y - W-BSound signal (Front
Right)Audio system is playing-
WFL-(2) (S28-9) -
GND (S30-16)L - W-BSound signal (Front
Left)Audio system is playing-
WFR-(2) (S28-10) -
GND (S30-16)B - W-BSound signal (Front
Right)Audio system is playing-
MUTE (S29-1) - GND
(S30-16)Y - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
L- (S29-2) - GND
(S30-16)G - W-BSound signal from
radio receiver (Left)Audio system is playing-
L+ (S29-3) - GND
(S30-16)R - W-BSound signal from
radio receiver (Left)Audio system is playing-
R- (S29-4) - GND
(S30-16)W - W-BSound signal from
radio receiver (Right)Audio system is playing-
R+ (S29-5) - GND
(S30-16)B - W-BSound signal from
radio receiver (Right)Audio system is playing-
TX-(1), MTX-(2) (S29-
7) - GND (S30-16)LG - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TX+(1), MTX+(2)
(S29-8) - GND (S30-
16)L - W-BAVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
ACC (S29-12) - GND
(S30-16)GR - W-BAccessory (ON)Turn ignition switch to
OFF --> ACCBelow 1 V -->
10 to 14 V
SPD (S29-11) - GND
(S30-16)O - W-BSpeed signal from
combination meterVehicle is drivingPulse generation
TXD-(1), RTX-(2)
(S29-19) - GND (S30-
16)R - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
TXD+(1), RTX+(2)
(S29-20) - GND (S30-
16)G - W-B ((5))AVC-LAN
communication signalTurn ignition switch to
ACC2 to 3 V
N-MUT(1), N-MU(2)
(S29-21) - GND (S30-
16)SB - W-B
(
(3))
Mute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
TMUT (S29-24) -
GND (S30-16)LG - W-BMute signal from radio
receiverAudio system is
sounding --> ChangingAbove 3.5 V -->
Below 3.5 V
B+(1), +B(2) (S30-1) -
GND (S30-16)L-R - W-BBatteryAlways10 to 14 V
FL+ (S30-4) - GND LG(3), P(4) - Sound signal (Front Audio system is playing-

WIRING DIAGRAM
Fig. 67: Identifying Stereo Component Amplifier Assy Wiring Diagram

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSY -
COMBINATION METER ASSY)
a. Disconnect the connectors from the stereo component amplifier assy S29 and combination meter
assy C12.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION CONDITION CHART
Tester connectionConditionSpecified condition
SPD - +SAlwaysBelow 1 ohms
SPD - Body groundAlways10 kohms or higher

Fig. 41: SRS Airbag Data List Item Reference Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
STEERING PAD:
Fig. 42: Steering Pad Data List Item Reference Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
ENGINE:
ENGINE DATA LIST ITEM REFERENCE
ABS:
ABS DATA LIST ITEM REFERENCE
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic Note
VEHICLE
SPEEDVehicle speed / Min.: 0 km/h
(0 mph), Max.: 255 km/h (158
mph)Almost same as actual
vehicle speed (When
driving)
-
ENGINE
SPDEngine speed / Min.: 0 rpm,
Max.: 16,383 rpmAlmost same as actual
engine speed (When
engine is running)
-
COOLANT
TEMPCoolant Temperature / Min.: -
40°C (-40°F), Max.: 140 °C
(284 °F)After warning up: 80 to
95°C (178 to 203°F)If the value is "-40°C (-40°F)" or
"140°C (248 °F)", sensor circuit
is open or shorted
ItemMeasurement Item/ Range (Display)Normal ConditionDiagnostic
Note
(FR/FL/RR/RL)
SPDVehicle speed / Min.: 0 km/h (0 mph),
Max.: 326 km/h (202 mph)Almost samo as actual speed
(When driving)-

METER:
SPEED METER DATA LIST REFERENCE
OK:
Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
NG: Go to step 3
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
3.READ VALUE OF HAND-HELD TESTER (VEHICLE SPEED SIGNAL)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST"
ABS:
ABS DATA LIST REFERENCE
OK:
Vehicle speed displayed on the tester is almost the same as the actual vehicle speed.
NG: GO TO BRAKE CONTROL SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
OK: GO TO NEXT STEP
4.INSPECT COMBINATION METER ASSY
INSPECTION USING OSCILLOSCOPE
a. Check the input signal waveform.
b. Remove the combination meter assy.
c. Connect the oscilloscope to the terminals C12-18 and body ground.
d. Start the en
gine.
ItemMeasurement Item/ Range (Display)Normal ConditionDiagnostic
Note
SPEED
METERVehicle speed / Min.: 0 km/h (0 mph),
Max.: 255 km/h (158 mph)Almost same as actual vehicle
speed (When driving)-
ItemMeasurement Item/ Range (Display)Normal ConditionDiagnostic
Note
(FR/FL/RR/RL)
SPDVehicle speed / Min.: 0 km/h (0 mph),
Max.: 326 km/h (202 mph)Almost same as actual speed
(When driving)-

METER:
TACHO METER DATA LIST REFERENCE
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
NG: Go to step 3
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
3.READ VALUE OF HAND-HELD TESTER (ENGINE SPEED SIGNAL)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
ENGINE:
DATA LIST REFERENCE
OK:
Engine speed displayed on the tester is almost the same as the actual engine speed.
NG: GO TO ENGINE CONTROL SYSTEM (SEE REPLACEMENT
)
OK: GO TO NEXT STEP
4.INSPECT COMBINATION METER ASSY
INSPECTION USING OSCILLOSCOPE
a. Check the input signal waveform.
1. Remove the combination meter assy.
2. Connect the oscilloscope to the terminals C12-4 and body ground.
3. Start the engine.
4. Check the si
gnal waveform according to the condition (s) in the table below.
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic
Note
TACHO
METEREngine speed / Min.: 50 rpm,
Max.: 12,750 rpmAlmost same as actual engine speed
(When engine is running)-
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic
Note
ENGINE
SPDEngine speed / Min.: 50 rpm,
Max.: 12,750 rpmAlmost same as actual engine speed
(When engine is running)-

Fig. 16: Fail-Safe Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.DATA LIST
a. While the hand-held tester is connected to the DLC3 and with the ignition switch turned to the ON
position, the CRUISE CONTROL data list can be displayed. Follow the prompts on the tester
screen to access the data list.
DATA LIST (CC (ECM))
Item
Measurement Item / Display
(Range)
Normal ConditionDiagnostic Note
VEHICLE SPDVehicle speed / min.: 0 km/h (0
mph), max.: 255 km/h (158
mph)Actual vehicle speed-
MEMORY SPDCruise control memorized
speed / min.: 0 km/h (0 mph),
max.: 255 km/h (158 mph)Actual stored vehicle speed-
THROTTLERequired throttle opening angle /
min.: 0°, max.: 125°Actual required throttle opening-
CRUISE CTRLCruise control system active
condition / ON or OFFON: Cruise control activated
OFF: Cruise control inactivated-
MAIN SW
(MAIN)Main SW signal (Main CPU) /
ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed
off)"3"
MAIN SW (SUB)Main SW signal (Sub CPU) /
ON or OFFON: Main SW ON (Pushed on)
OFF: Main SW OFF (Pushed
off)"3"
CCS READY MCruise control system standby
condition (Main CPU) / ON or
OFFON --> OFF: Change ON/OFF
each time Main SW is pushed in."1"