2003 LEXUS LS430 Control actuator

Fig. 48: Identifying C12 And S42 Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: GO TO NEXT STEP
6.INSPECT ABS & TRACTION ACTUATOR ASSY (VSC)
a. Disconnect the S42 connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
S42 connector VOLTAGE SPECIFICATIONS
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
Fig. 49: Identifying S42 Connector Terminals

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OK: GO TO BRAKE CONTROL SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
Tester ConnectionConditionSpecified Condition
S42-12 - Body groundIgnition switch ON10 to 14 V

The computer which controls the cruise control system is combined with the ECM, and the actuator uses
the throttle position sensor and motor. A microcomputer is built into the ECM to control functions
including: ON-OFF, SET/COAST, RESUME/ACCEL, CANCEL, vehicle speed operation, motor output
control, and overdrive control.
The ECM compares the driving vehicle speed from the speed sensor with the stored vehicle speed
set through the cruise control main switch assy. The ECM instructs the throttle valve motor of the
throttle position sensor and motor to close the valve when the driving vehicle speed is greater than
the stored vehicle speed, and instructs it to open the valve when the driving speed is less than the
stored speed.
The ECM receives signals such as ON-OFF, SET/COAST, RESUME/ACCEL, and CANCEL from
the cruise control main switch assy and executes them.
The ECM turns on the indicator in the combination meter based upon the ON signal from the cruise
control main switch assy.
The ECM cancels the cruise control system when it detects that the brake pedal is depressed, based
on the stop lamp switch signal.
The ECM cancels the cruise control system when it detects that the shift position is changed from
D (6th, 5th or 4th gear) to N (3rd, 2nd or 1st gear), based on the park/neutral position switch assy
signal.
2.LIMIT CONTROL
a. Low speed limit
The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The
cruise control system cannot be set when the driving vehicle speed is below the low speed limit.
Cruise control operation will be automatically canceled and the stored vehicle speed will be erased
when the vehicle speed goes below the low speed limit while the cruise control is in operation.
b. High speed limit
The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph).
The cruise control system cannot be set when the driving vehicle speed is over the high speed limit.
Speed up using RESUME/ACCEL with the cruise control main switch assy also cannot be set
beyond the high speed limit.
3.OPERATION OF CRUISE CONTROL
The cruise control main switch operates seven functions: SET, COAST, TAP-DOWN, RESUME,
ACCEL, TAP-UP, and CANCEL. The SET, TAP-DOWN and COAST functions, and the RESUME,
TAP-UP and ACCEL functions are operated with the same switch. The cruise control main switch assy is
an automatic return type switch which turns on only while operating it in each arrow direction and turns
off after releasing it.
a. SET CONTROL
Vehicle speed is stored and constant speed control is maintained when pushing the switch to SET/
COAST while drivin
g with the cruise control main switch ON-OFF button on (the CRUISE main

HINT:
"3" is OK but "1" is NG --> ECM failure
"1" is OK but "2" is NG --> DTC output or ECM failure
"3" is OK but cruise indicator not turn on --> CRUISE MAIN indicator or wire harness or ECM failure
2.ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand-held tester allows components such as the relay, VSV, and
actuator to operate without parts removal. Performing the ACTIVE TEST as the first step of
troubleshooting is one way to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. According to the display on the tester, perform the "ACTIVE TEST".
HINT:
CCS READY SCruise control system standby
condition (Sub CPU) / ON or
OFFON --> OFF: Change ON/OFF
each time Main SW is pushed in."1"
CCS INDICATOR
MCruise indicator signal (Main
CPU) /ON or OFFON: "CCS READY" ON OFF:
"CCS READY" OFF"2"
CCS
INDICATORSCruise indicator signal (Sub
CPU) /ON or OFFON: "CCS READY" ON OFF:
"CCS READY" OFF"2"
CANCEL SWCANCEL SW signal / ON or
OFFON: CANCEL SW ON OFF:
CANCEL SW OFF-
SET/COAST SWSET/COAST SW signal / ON or
OFFON: SET/COAST SW ON OFF:
SET/COAST SW OFF-
RES/ACC SWRES/ACC SW signal / ON or
OFFON: RES/ACC SW ON OFF:
RES/ACC SW OFF-
STP LIGHT SW MStop lamp SW signal (Main
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT SW
S1Stop lamp SW signal (Sub
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
STP LIGHT SW
S2Stop light SW signal (Sub
CPU) / ON or OFFON: Brake pedal depressed OFF:
Brake pedal released-
SHIFT D POSPNP SW signal (D position) /
ON or OFFON: Shift D position OFF:
Except shift D position-

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2.CLEAR DTC
a. Connect the hand-held tester to the Controller Area Network Vehicle Interface Module (CAN
VIM). Then connect the CAN VIM to the DLC3.
b. Turn the ignition switch ON.
c. Erase the DTCs by following the prompts on the tester screen.
HINT:
Refer to the hand-held tester operator's manual for further details.
1.DATA LIST
HINT:
Using the hand-held tester's DATA LIST allows switch, sensor, actuator and other item values to be read
without removing any parts. Reading the DATA LIST early in troubleshooting is one way to save time.
1. Connect the hand-held tester (with CAN VIM) to the DLC3.
2. Turn the ignition switch ON.
3. Read the DATA LIST on the tester's screen.
DRIVER DOOR ECU, PASSENGER DOOR ECU, REAR DOOR ECU LH AND REAR DOOR
ECU RH DATA LIST
Item
Measurement item/Display
(Range)
Normal ConditionDiagnostic Note
CAM POS SW3Cam position switch 3 signal/
ON or OFFRefer to system description of
closer motor and cam position
switch (SEE SYSTEM
DESCRIPTION )
-
CAM POS SW2Cam position switch 2 signal/
ON or OFFRefer to system description of
closer motor and cam position
switch (SEE SYSTEM
DESCRIPTION )
-
CAM POS SW1Cam position switch 1 signal/
ON or OFFRefer to system description of
closer motor and cam position
switch (SEE SYSTEM
DESCRIPTION )
-
POLE SWPawl switch signal/ ON or OFFRefer to system description of
door ECU (SEE SYSTEM
DESCRIPTION )
-
HALF SWHalf switch signal/ ON or OFFRefer to system description of -

ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION (W/SMART
KEY)
ENGINE IMMOBILIZER DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION (W/O
SMART KEY)
C1714, DTC C1714 CIRCUIT
DTC C1715, DTC C1716, DTC C1717, DTC
C1791, DTC C1792, DTC C1793
RIGHT FRONT ACCELERATION SENSOR CIRCUIT
DTC C1725, DTC C1726, DTC C1727, DTC
C1728
RIGHT FRONT ABSORBER CONTROL ACTUATOR
CIRCUIT
DTC C1735 EXHAUST SOLENOID VALVE CIRCUIT
DTC C1737, DTC C1738, DTC C1739, DTC
C1740
RIGHT FRONT HEIGHT CONTROL SOLENOID
VALVE CIRCUIT
DTC C1741 AIR SUS RELAY CIRCUIT
DTC C1742 HEIGHT CONTROL COMPRESSOR CIRCUIT
DTC C1751, DTC C1752 CONTINUOUS ELECTRIC CURRENT TO HEIGHT
CONTROL COMPRESSOR
DTC C1761 ECU MALFUNCTION
DTC C1774 POWER SOURCE CIRCUIT
DTC C1776 SPEED SENSOR CIRCUIT
DTC C1777 STEERING ANGLE SENSOR CIRCUIT
DTC C1786 HEIGHT CONTROL SWITCH CIRCUIT (TEST
DIAGNOSIS)
DTC C1787 ABSORBER CONTROL SWITCH CIRCUIT (TEST
DIAGNOSIS)
DTCDescription
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
DTC B2793 TRANSPONDER CHIP MALFUNCTION
DTC B2794 UNMATCHED ENCRYPTION CODE
DTC B2795 UNMATCHED KEY CODE
DTC B2797 COMMUNICATION MALFUNCTION NO.1
DTC B2799 ENGINE IMMOBILIZER SYSTEM
MALFUNCTION
DTCDescription
DTC B2780 PUSH SWITCH/KEY UNLOCK WARNING
SWITCH MALFUNCTION
DTC B2793 TRANSPONDER CHIP MALFUNCTION

DTC P0450, DTC P0451, DTC P0452, DTC
P0453
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR MALFUNCTION;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR RANGE/PERFORMANCE;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR/SWITCH LOW INPUT;
EVAPORATIVE EMISSION CONTROL SYSTEM
PRESSURE SENSOR/SWITCH HIGH INPUT
DTC P0455, DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM
LEAK DETECTED (GROSS LEAK);
EVAPORATIVE EMISSION CONTROL SYSTEM
LEAK DETECTED (VERY SMALL LEAK)
DTC P0500, P0503 VEHICLE SPEED SENSOR "A", VEHICLE
SPEED SENSOR "A"
INTERMITTENT/ERRATIC/HIGH
DTC P0504, P0571 BRAKE SWITCH "A"/"B" CORRELATION,
BRAKE SWITCH "A" CIRCUIT
DTC P0505 IDLE AIR CONTROL SYSTEM
DTC P0560 SYSTEM VOLTAGE
DTC P0604, P0606, P0607, P0657 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR, ECM/PCM
PROCESSOR, CONTROL MODULE
PERFORMANCE, ACTUATOR SUPPLY
VOLTAGE CIRCUIT/OPEN
DTC P0617 STARTER RELAY CIRCUIT HIGH
DTC P0630 VIN NOT PROGRAMMED OR MISMATCH -
ECM/PCM
DTC P1340, P1341 CAMSHAFT POSITION SENSOR "A" (BANK 1
SENSOR 2)
DTC P2102, P2103 THROTTLE ACTUATOR CONTROL MOTOR
CIRCUIT LOW/HIGH
DTC P2111, P2112 THROTTLE ACTUATOR CONTROL SYSTEM -
STUCK OPEN/CLOSED
DTC P2118 THROTTLE ACTUATOR CONTROL MOTOR
CURRENT RANGE/PERFORMANCE
DTC P2119 THROTTLE ACTUATOR CONTROL THROTTLE
BODY RANGE/PERFORMANCE
DTC P2120, P2122, P2123, P2125, P2127, P2128,
P2138
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT,
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "D" CIRCUIT LOW/HIGH
INPUT, THROTTLE/PEDAL POSITION
SENSOR/SWITCH "E" CIRCUIT, DTC
THROTTLE/PEDAL POSITION
SENSOR/SWITCH "E" CIRCUIT LOW/HIGH
INPUT, THROTTLE/PEDAL POSITION

dynamic laser cruise control system.
Operation of the constant speed control mode is the same as that for the conventional type
cruise control system.
b. This system maintains the vehicle running at the speed that the driver has set, as long as there are
no vehicles ahead in the same lane. Then, the system maintains the vehicle distance that has been
set by the driver.
If the system detects a vehicle moving at a slower speed ahead while the driver is driving at a
constant speed, it closes the throttle valve to decelerate. If further deceleration is required, the
system controls the brake actuator in order to apply the brakes. Thereafter, if there are no vehicles
ahead within the set vehicle-to-vehicle distance because either the vehicle ahead or the driver has
changed lanes, the system accelerates slowly to reach the set vehicle speed and resumes driving at
the constant speed.
c. The constant speed control mode is designed to maintain a constant cruising speed. The vehicle-to-
vehicle distance control mode is designed to control cruising at a constant speed function,
deceleration cruising function, follow-up cruising function and acceleration cruising function.
d. The laser sensor and the distance control ECU (cruise control ECU) control the system while the
vehicle-to-vehicle distance control mode is in operation, and send signals to each actuator and
ECU.
e. In vehicle-to-vehicle distance control mode, the dynamic laser cruise control system receives
signals from the yaw rate & deceleration sensor and the steering angle sensor. Based on these
signals, it then estimates curve radius and compensates for information on the preceding vehicle
while turning. It can also compensate for the brake control when approaching another vehicle.
f. This system judges the existence of a vehicle in front and the distance to it based on the signals
from the laser sensor while the vehicle-to-vehicle distance control mode is in operation. Using this
information, the system informs the driver of any danger with the warning buzzer, performs brake
control, and turns on the stop lamp when approaching the vehicle in front.
g. The following illustration shows a control example under the following conditions: own vehicle
speed is 100 km/h (62 mph) and the speed of the vehicle in front is 80 km/h (50 mph).

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.DATA LIST
HINT:
From the DATA LIST displayed on the hand-held tester, the value of components such as the switch,
sensor, and actuator can be read without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one way to shorten labor time.
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position.
c. According to the display on the tester, read the "DATA LIST".
CC (ECM):
DATA LIST (CC (ECM))
Item
Measurement Item /
Display (Range)
Normal ConditionDiagnostic Note
ACCEL REQUESTAccelerator request signal /
min.: -2621.44 k/h/s, max.:
2621.36 k/h/sNo vehicle in front-
VEHICLE
DISTANCELaser sensor / min.: 0 m (0ft),
max.: 255m (836.65 ft)Distance to the vehicle in front-
L/C OPTION FLAGLaser cruise option flag / NO,
YESYES: Vehicle to vehicle distance
mode-
DISTANCE TIMECar distance time setting
condition /SHRT, MID,
LONG, NOThe vehicle selected by distance
control switch-
O/D CUT RQSTO/D cut request / NOT REQ,
REQUESTNOT REQ: Idling-
3RD SHIFT DOWNShift down request to 3rd
gear / NOT REQ, REQUESTNOT REQ: Idling-
4TH SHIFT DOWNShift down request to 4th
gear / NOT REQ, REQUESTNOT REQ: Idling-
ALARM RQSTAlarm request signal / NOT
REQ, REQUESTREQUEST: When beeping NOT
REQ: When not beeping-
THROTTLE CLOSEAll throttle close request /
NOT REQ, REQUESTON: REQUEST OFF: NOT
REQUEST-
BRAKE CTRL RQSTBrake control request / NOT
REQ, REQUESTON: REQUEST OFF: NOT
REQUEST-
TARG DECL SLOPECruise target deceleration
slope / 0.03, 0.06, 0.11, 0.160.03, 0.06, 0.11, 0.16-