sensor LEXUS LS430 2003 Factory Repair Manual

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the exhaust gas (NOx) outside the vehicle and sends a signal to the A/C amplifier.
Fig. 121: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM

Fig. 122: Emission Gas Nox Sensor Circuit
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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:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
NOX GAS
SENSEmission gas Nox sensor / min.: 0
max.:255Increases as the gas amount
increases-

Fig. 123: Inspecting Air Conditioning Amplifier (NOX - SG-1)
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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 EXHAUST GAS SENSOR
a. Remove the exhaust gas sensor.
b. After keeping to apply battery voltage between terminals 3 and 6 for more than 120 seconds,
measure the resistance between terminals 1 and 2.
c. Measure the resistance according to the value (s) in the table below.
Standard:
EXHAUST GAS SENSOR RESISTANCE
Tester connectionConditionSpecified condition
E10-1 (S.G) - E10-4 (NOX)at 10 to 35°C (50 to 95°F)5 to 100 kohms

HINT:
<003a004b0048005100030057004b004800030056004800510056005200550003004c005600030048005b0053005200560048004700030057005200030057004b004800030048005b004b00440058005600570003004a00440056000f00030057004b004800
03005500480056004c0056005700440051004600480003004a[oes down.
Fig. 124: Inspecting Exhaust Gas Sensor

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NG: REPLACE EXHAUST GAS SENSOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - EXHAUST GAS
SENSOR) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER - EXHAUST GAS SENSOR RESISTANCE

Fig. 125: Checking Harness And Connector (Air Conditioning Amplifier - Exhaust Gas Sensor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

CIRCUIT DESCRIPTION
This sensor detects the smoke inside the cabin and sends the appropriate signals to the luggage room J/B ECU.
WIRING DIAGRAM
Fig. 189: Smoke Sensor Circuit

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INSPECTION PROCEDURE
1.INSPECT LUGGAGE ROOM J/B ECU (RMGV - BODY GROUND)
a. Remove the luggage room J/B ECU with connectors still connected.
b. Measure the voltage according to the value (s) in the table below when applying or not applying

NG: Go to STEP 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
2.INSPECT SMOKE SENSOR
a. Remove the smoke sensor.
b. Connect the positive (+) lead from the battery to terminal S47-1 and negative (-) lead to terminal
S47-3.
c. Measure the voltage according to the value (s) in the table below.
Standard:
SMOKE SENSOR VOLTAGE
Tester connectionConditionSpecified condition
S47-2 - S47-3There is no smokeBelow 1.0 V
S47-2 - S47-3There is smokeAbove 4.0 V

Fig. 191: Inspecting Smoke Sensor

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NG: REPLACE SMOKE SENSOR
OK: Go to next step
3.CHECK HARNESS AND CONNECTOR (BATTERY - SMOKE SENSOR) (SEE ELECTRONIC
CIRCUIT INSPECTION PROCEDURE )
a. Measure the resistance according to the value (s) in the table below.
Standard:
BATTERY - SMOKE SENSOR RESISTANCE
b. Measure the voltage according to the value (s) in the table below.
Standard:
BATTERY - SMOKE SENSOR VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Tester connectionConditionSpecified condition
S47-1 (GND) - Body groundAlwaysBelow 1 ohms
Tester connectionConditionSpecified condition
S47-3 (+B) - Body groundIG ON10 to 14 V