sensor LEXUS LS430 2003 Factory Repair Manual

Fig. 68: Checking Harness And Connector (Air Conditioning Amplifier - Exhaust Gas Sensor)
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
CIRCUIT DESCRIPTION
A photodiode in the A/C solar sensor detects solar radiation and sends signals to the A/C amplifier.
Fig. 69: Photodiode Resistance/Solar Radiation Strength Graph

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Fig. 70: DTC Detection Item Trouble Area Chart
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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)

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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

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Result:
AIR CONDITIONING AMPLIFIER (TSPA) 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
3.INSPECT A/C SOLAR SENSOR
a. Remove the A/C solar sensor.
b. Apply battery voltage between terminals A28-6 (CLTB) and A28-3 (CLTE) of the A/C solar
sensor.
NGA
OK (Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C

c. Measure the voltage according to the value (s) in the table below.
Standard:
A/C SOLAR SENSOR 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 solar sensor.
Tester connectionConditionSpecified condition
A28-2 (TSR) - A28-3 (CLTE)Sensor is subjected to electric light4.0 to 4.6 V
A28-2 (TSR) - A28-3 (CLTE)Sensor is covered by a clothBelow 0.8 V

Fig. 73: Inspecting A/C Solar Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE A/C SOLAR SENSOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (A/C SOLAR SENSOR - AIR CONDITONING
AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
A/C SOLAR SENSOR - AIR CONDITONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A11-20 (TSPa) - A28-2 (TSR)AlwaysBelow 1 ohms
A11-20 (TSPa) - Body groundAlways10 kohms or higher

Fig. 74: Checking Harness And Connector (A/C Solar Sensor - Air Conditoning Amplifier)

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NG: Go to STEP 3
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
3.INSPECT A/C PRESSURE SENSOR
a. Disconnect the A/C pressure sensor connector.
b. Install the manifold gauge set (see ON
-VEHICLE INSPECTION ).
c. Connect the positive (+) lead from the three 1.5 V dry cell batteries to terminal 3 and negative (-)
lead to terminal1.
d. Check voltage between terminals 2 and 1 of A/C pressure sensor.
OK:
The voltage depends on the refrigerant pressure as shown in the chart.

Fig. 80: Inspecting A/C Pressure Sensor
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