2003 LEXUS LS430 ignition

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 (TFACEDr - SG-3)
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 (TFACEDr - SG-3) VOLTAGE
HINT:
As the temperature increases, the volta
ge decreases.
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A13-15 (TFACEDr) - A13-10 (SG-3)Ignition switch ON at 25°C (77°F)1.8 to 2.2 V
A13-15 (TFACEDr) - A13-10 (SG-3)Ignition switch ON at 50°C (122°F)0.8 to 1.2 V

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-

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 (DGS - SG-1)
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 (DGS - SG-1) VOLTAGE
HINT:
As the temperature increases, the volta
ge decreases.
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-29 (DGS) - A13-8 (SG-1)Ignition switch ON at 10 to 35°C (50 to 95°F)1.0 to 4.5 V

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.

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 (TSPa)
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 (TSPA) VOLTAGE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the A/C solar sensor.
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
SOLAR
SENS-PSolar sensor (Passenger side) / min.: 0
max.: 255decreases as brightness
increases-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-20 (TSPa) - Body groundSensor is subjected to electric light4.0 to 4.6 V
A11-20 (TSPa) - Body groundSensor is covered by a clothBelow 0.8 V

Fig. 78: Refrigerant Volume Problem Symptoms Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
*: Bubbles in the sight glass with ambient temperature higher than usual can be considered normal if
cooling is sufficient.
NG: CHARGE REFRIGERANT (SEE ON
-VEHICLE INSPECTION )
OK: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (PRS, SG-5)
a. Remove the A/C amplifier with connector still connected.
b. Install the manifold gauge set (see ON
-VEHICLE INSPECTION ).
c. Turn the ignition switch to the ON position.
d. Measure the voltage according to the value (s) in the table below.
OK:
The voltage depends on the refrigerant pressure as shown in the chart.

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