AIR CONDITIONING SYSTEM, Diagnostic DTC:B1461

DTC Code DTC Name
B1461 Emission Gas NOx Sensor Circuit

DESCRIPTION

The smog ventilation sensor is installed to the front of the cooler condenser assembly to automatically control the air inlet mode (fresh, recirculation/fresh, and recirculation).

This sensor detects NOx in the ambient air and transmits signals to the air conditioning amplifier assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1461 Emission Gas NOx Sensor Circuit

  • Diagnosis condition: None

  • Malfunction status: Short in smog ventilation sensor circuit

  • Detection time: Continuously for 4 seconds or more (Present malfunction), although only when the power switch off → on (IG) continuously 28 seconds or more

  • Smog ventilation sensor

  • Harness or connector

  • Air conditioning amplifier assembly

 -

WIRING DIAGRAM

B000S41E12

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • If DTCs B1418 and B1461 are stored simultaneously, there may be a malfunction in the smog ventilation sensor power source circuit.

PROCEDURE


  1. READ VALUE USING GTS (EMISSION GAS NOX SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor.

    5. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    6. Read the Data List according to the display on the GTS.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Emission Gas Nox Sensor Emission gas (NOx)

      Min.: 0

      Max.: 255

      		 Smog ventilation sensor value increases as gas amount increases Smog ventilation sensor malfunction

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Emission Gas Nox Sensor
      OK
      The display is as specified in the normal condition column.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY AND BODY GROUND)


    1. B000P2ZC02
      *a

      Front view of wire harness connector

      (to Smog Ventilation Sensor)

      Disconnect the smog ventilation sensor connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A47-5 (E) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A47-1 (IG) - Body ground Power switch on (IG) 11 to 14 V
      A47-1 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SMOG VENTILATION SENSOR


    1. Remove the smog ventilation sensor.

      Click here

    2. Inspect the smog ventilation sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SMOG VENTILATION SENSOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the A47 Smog ventilation sensor connector.

    2. Disconnect the P57 air conditioning amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A47-4 (SG) - P57-2 (SG-2) Always Below 1 Ω
      A47-2 (DGS 1) - P57-27 (DGS 1) Always Below 1 Ω
      A47-4 (SG) or P57-2 (SG-2) - Other terminals and body ground Always 10 kΩ or higher
      A47-2 (DGS 1) or P57-27 (DGS 1) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR