dlc3 LEXUS LS430 2003 Factory Workshop Manual

WIRING DIAGRAM
Fig. 55: Air Duct Sensor Circuit (Driver Side)

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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
DUCT
TEMP-DDuct sensor (Driver side) / min.: -12.7°C
(9.14°F) max.: 76.55°C (169.79°F)Actual duct temperature is
displayed (Driver side)-

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TFACEPa - SG-4)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TFACEPa - SG-4) VOLTAGE
HINT:
As the temperature increases, the volta
ge decreases.
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
DUST
TEMP-PDuct sensor (Passenger side) / min.: -12.7°C
(9.14°F) max.: 76.55°C (169.79°F)Actual duct temperature is
displayed (Passenger side)-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A13-14 (TFACEPa) - A13-11 (SG-4)Ignition switch ON at 25°C (77°F)1.8 to 2.2 V
A13-14 (TFACEPa) - A13-11 (SG-4)Ignition switch ON at 50°C (122°F)0.8 to 1.2 V

Fig. 65: Emission Gas Sensor Circuit
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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
EMISS GAS
SENSEmission gas / min.: 0 V max.:
255 VIncreases as the gas amount
increases-

Fig. 70: DTC Detection Item Trouble Area Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244: LIGHT SENSOR CIRCUIT
MALFUNCTION .
WIRING DIAGRAM
Fig. 71: Solar Sensor Circuit (Passenger Side)

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 push the hand-held tester main switch on.

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TSDr)
a. Remove the A/C amplifier with connector still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TSDR) VOLTAGE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
SOLAR SENS-
DSolar sensor (Driver side) / min.: 0 max.:
255Increases as brightness
increases-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-19 (TSDr) - Body groundSensor is subjected to electric light4.0 to 4.6 V
A11-19 (TSDr) - Body groundSensor is covered by a clothBelow 0.8 V

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 88: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 89: Rear Solar Sensor Circuit

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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the displa
y on the hand-held tester.

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the items below in the DATA LIST, and read the displays on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TPI - SG)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set RECIRC/FRESH to activate the air inlet servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPI - SG) VOLTAGE
Item
Measure Item/Display
(Range)
Normal ConditionDiagnostic Note
A/I DAMP
POSAir inlet damper position /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100%-
A/I DAMP
TARGAir inlet damper target /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100% HALF-
RECIRCULATION: 43 to 99.5 %-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A37-20 (TPI) - A37-19 (SG)RECIRC3.5 to 4.5 V
A37-20 (TPI) - A37-19 (SG)FRESH0.5 to 1.5 V

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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TPBDr - SG-7)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set temperature to activate the cool air bypass servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPBDr - SG-7) VOLTAGE
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
A/B DAMP
POS-DCool air bypass damper position (Driver
side) / min.: -14% max.: 113.5%OPEN: Approx. 0 % SHUT:
Approx. 100%-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Hot0.5 to 1.8 V
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Cool3.5 to 4.5 V

Fig. 107: Max Cool Damper Position Sensor Circuit (Passenger Side)
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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
A/B DAMP
POS-PCool air bypass damper position (Passenger
side) / min.: -14% max.: 113.5%OPEN: Approx. 0 %
SHUT: Approx. 100%-

Fig. 122: Emission Gas Nox Sensor Circuit
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 push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
NOX GAS
SENSEmission gas Nox sensor / min.: 0
max.:255Increases as the gas amount
increases-