2003 LEXUS LS430 Ecm

OK: When cruise control main switch operation is performed the standard values will be above.
NG: REPLACE ECM (SEE REPLACEMENT
)
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS
TABLE
CIRCUIT DESCRIPTION
Making a short circuit between terminals TC and CG of the DLC3 will output DTCs from the DLC3.
WIRING DIAGRAM
Fig. 32: [Wiring Diagram
- Diagnosis Circuit]
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
When a particular warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in the relevant ECU is suspected.
INSPECTION PROCEDURE
CCS
INDICATORSCruise indicator signal (Sub
CPU) /ON or OFFON: "CCS READY" ON OFF:
"CCS READY" OFF-

1.CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM)
a. Disconnect the E2 connector from the ECM.
b. Measure the resistance according to the value(s) in the table below.
DLC3 CONNECTOR TERMINALS RESISTANCE SPECIFICATION
Fig. 33: Identifying DLC3 Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Tester connectionConditionSpecified condition
TC (E2-3) - TC (D1 - 13)AlwaysBelow 1 ohms

Fig. 34: Disconnecting E2 Connector From ECM
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - ECM)
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND)
a. Measure the resistance according to the value(s) in the table below.
DLC3 CONNECTOR TERMINALS RESISTANCE SPECIFICATION
Fig. 35: Identifying DLC3 Connector (CG) Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (DLC3 - BODY GROUND)
OK: Go to next step
Tester connectionConditionSpecified condition
CG (D1-4) - Body groundAlwaysBelow 1 ohms

3.CHECK HARNESS AND CONNECTOR (TC of DLC3 - BODY GROUND)
a. Measure the resistance according to the value(s) in the table below.
DLC3 CONNECTOR TERMINALS RESISTANCE SPECIFICATION
NG: REPAIR OR REPLACE WIRE HARNESS AND EACH ECU
Fig. 36: Identifying DLC3 Connector (TC) Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE ECM (SEE REPLACEMENT
)
Tester connectionConditionSpecified condition
TC (D1-13) - Body groundAlways10 kohms or higher

c. Adjust the laser beam axis
1. Turn the ignition switch to the ON position.
2. Push the cruise control main switch ON-OFF button on.
3. Connect the hand-held tester to the DLC3, and turn the power ON.
Fig. 9: Connecting Hand
-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4. Operate by following the screen menu and select "BEAM AXIS ADJUST" of the Laser Cruise
Control, then press the "ENTER" key.
HINT:
Pressing the "ENTER" key will make the ECM transfer to BEAM AXIS ADJUSTMENT
MODE.
When the ECM transfers to BEAM AXIS ADJUSTMENT MODE, the buzzer sounds for 1
second.

Fig. 27: Measuring To Left And Placing Reflector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f. Adjust the radar beam axis
1. Turn the ignition switch to the ON position.
2. Push the cruise control main switch ON-OFF button on.
3. Connect the hand-held tester to the DLC3, and turn the power ON.
Fig. 28: Connecting Hand
-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4. Operate by following the screen menu and select "BEAM AXIS ADJUST" of the Radar
Cruise Control, then press the "ENTER" key.
HINT:
Pressing the "ENTER" key will make the ECM transfer to BEAM AXIS
ADJUSTMENT MODE.
When the ECM transfers to BEAM AXIS ADJUSTMENT MODE, the buzzer sounds
for 1 second.

GENERAL MOTORS
GENERAL MOTORS - DOMESTIC CARS
1991On Right Rear Corner Of Engine Compartment, On ECA
Cover
1992On Right Rear Corner Of Engine Compartment, Below MAP
Sensor
1993-95Right Rear Of Engine Compartment
Tempo & Topaz
1984-92On Right Rear Corner Of Engine Compartment
1993-94In Engine Compartment, On Left Strut Tower
ApplicationConnector Location
AllanteEnter Diagnostic Mode By Pressing OFF & WARM Buttons
On Instrument Panel
Bonneville (1980-81)ECU Connector On Upper Right Kick Panel
Brougham (1987-92)Bottom Center Of Instrument Panel
Camaro & Firebird (1980)Diagnostic Ground Lead Connector On Right Shroud Above
ECM
Caprice Classic
1980-81ECU Connector On Upper Right Kick Panel
1982-88Under Center Of Instrument Panel
CatalinaECU Connector On Upper Right Kick Panel
Cavalier (1982-88)On Side Of Fuse Block
CimarronOn Side Of Fuse Block
CenturyUnder Left Of Dash Ashtray
Corvette (1980-83)In Center Console, Under Ashtray
Custom Cruiser
1980-81ECU Connector On Upper Right Kick Panel
1982-88Under Center Of Instrument Panel
DeVille (1981-88)Enter Diagnostic Mode By Pressing OFF & WARMER
Buttons On Instrument Panel
Delta 88ECU Connector On Upper Right Kick Panel
Eldorado (1981-88)Enter Diagnostic Mode By Pressing OFF & WARMER
Buttons On Instrument Panel
Electra (1980-81)ECU Connector On Upper Right Kick Panel
Estate WagonECU Connector On Upper Right Kick Panel
FieroUnder Ashtray Or Cigar Lighter Panel Within Center Console
FirenzaOn Side Of Fuse Block

CHRYSLER GROUP LLC
Fleetwood (1981-88)Enter Diagnostic Mode By Pressing OFF & WARMER
Buttons On Instrument Panel
Fleetwood BroughamOn Bottom Center Of Dash, Near Ashtray
Impala (1982-88)Under Center Of Instrument Panel
LeMansECM Connector On Right Kick Panel Or Under Left Side Of
Dash
LeSabre (1980-81)ECU Connector On Upper Right Kick Panel
LeSabre Wagon (1982-88)Under Center Of Instrument Panel
MonzaUnder Right Side Of Dash
Ninety-Eight (1980-81)ECU Connector On Upper Right Kick Pane
NovaBehind Right Strut Tower
ParisienneUnder Center Of Instrument Panel
Reatta
1988-92 (MFI)Enter Diagnostic Mode By Pressing OFF & WARM
Buttons On Instrument Panel
1991-93Above Parking Brake Pedal
Riviera
1980-85 (Carbureted)Under Left Or Center Of Dash
1986-92 (MFI)Enter Diagnostic Mode By Pressing OFF & WARM
Buttons On Instrument Panel
SafariUnder Center Of Instrument Panel
Seville (1981-88)Enter Diagnostic Mode By Pressing OFF & WARMER
Buttons On Instrument Panel
SkyhawkUnder Right Side Of Dash
StarfireUnder Right Side Of Dash
SunbirdOn Side Of Fuse Block, Under Right Side Of Dash
Toronado
1980-85 (Carbureted)Under Left Or Center Of Dash
1986-92 (MFI)Enter Diagnostic Mode By Pressing OFF & WARM
Buttons On Instrument Panel
Trofeo
1988-92 (MFI)Enter Diagnostic Mode By Pressing OFF & WARM
Buttons On Instrument Panel
1991-93Above Parking Brake Pedal
2000On Side Of Fuse Block