2003 LEXUS LS430 Temperature sensor

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
CIRCUIT DESCRIPTION
This sensor detects the register temperature and sends the appropriate signals to the A/C amplifier.
Fig. 59: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM
Fig. 60: Air Duct 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 (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

AIR DUCT SENSOR RESISTANCE
HINT:
As the temperature increases, the resistance decreases.
Fig. 62: Inspecting Air Duct Sensor

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NG: REPLACE AIR DUCT SENSOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR DUCT
SENSOR) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance accordin
g to the value (s) in the table below.
Tester connectionConditionSpecified condition
D8-1 - D8-2at 0°C (32°F)14.5 to 19.0 kohms
D8-1 - D8-2at 25°C (77°F)4.8 to 5.2 kohms
D8-1 - D8-2at 50°C (122°F)1.6 to 2.0 kohms

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 (TSRr - GND)
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 (TSRR - GND) VOLTAGE
HINT:
As the temperature increases, the voltage decreases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.
Result:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
REAR SOLAR
SENSRear solar sensor / min.: 0 max.:
255Changes depending on
brightness-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-30 (TSRr) - A12-16 (S5-4)Sensor is subjected to electric light0.8 to 4.3 V
A11-30 (TSRr) - A12-16 (S5-4)Sensor is covered by a clothBelow 0.8 V

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OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This servomotor is controlled by the A/C amplifier. Air flow temperature changes when moving the air mix
damper to the target point. The target point can be detected with the air mix damper position sensor.
WIRING DIAGRAM

NG: REPLACE THE CD
OK: Go to next step
3.CHECK RADIO RECEIVER ASSY
a. Insert another CD and check if it is ejected.
OK: The disc is ejected.
NG: REPLACE RADIO RECEIVER ASSY (SEE REPLACEMENT
)
OK: NORMAL OPERATION
INSPECTION PROCEDURE
1.CHECK SPEAKERS
a. Check the speaker unit installed condition.
1. Check that each speaker is securely installed.
OK: The problem goes away.
HINT:
The radio has a noise prevention function to reduce noise when listening to the radio. If a loud noise
occurs, check whether the ground at the antenna mounting base and the noise prevention unit are installed
and wired correctly.
NOISE CONDITION CHART
Noise ConditionsNoise Source
Depressing the accelerator pedal makes the noise louder. However, the noise
stops immediately when the engine is stopped.Alternator
Noise occurs while the A/C or heater is in operation.Blower motor
Noise can be heard during sudden acceleration on an unpaved road, or after the
ignition switch is turned ON.Fuel pump
Noise can be heard when the horn is pressed and released, or held down
continuously.Horn
<00340058004c00480057000300510052004c0056004800030046004400510003004500480003004b00480044005500470003005a004b004c004f004800030057004b0048000300480051004a004c0051004800030055005800510056000f00030045005800
570003005600570052005300560003005a004b004800510003[the engine is
stopped.Ignition
Noise can be heard when the turn signal blinks.Flasher
Noise can be heard while window washer is in operation.Washer
Noise can be heard while the engine is running and continues after it is stopped.Water temperature
sensor
Noise can be heard while the wiper system is in operation.Wiper

Fig. 64: Removing O-Ring From Oil Strainer
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5.DISCONNECT TRANSMISSION WIRE
a. Remove the bolt and lock plate, and separate the ATF temperature sensor.
b. Remove the 2 bolts and 2 clamps.
c. Separate the 9 connectors from the solenoid valves.

Fig. 65: Removing Bolt And Lock Plate, And Separate ATF Temperature Sensor
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6.REMOVE TRANSMISSION WIRE
a. Disconnect the transmission wire connector.
b. Remove the bolt and pull out the transmission wire.