AIR CONDITIONING SYSTEM, Diagnostic DTC:B1461/61

DTC Code DTC Name
B1461/61 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
B1461/61 Emission Gas NOx Sensor Circuit Open or short in emission gas NOx sensor circuit (w/ Mirror Heater)

  • Smog ventilation sensor

  • Harness or connector between smog ventilation sensor and IG power source

  • Harness or connector between smog ventilation sensor and body ground

  • Harness or connector between smog ventilation sensor and air conditioning amplifier assembly

  • Air conditioning amplifier assembly

 -

WIRING DIAGRAM

B0074A2E01

CAUTION / NOTICE / HINT

Note


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

  • If DTCs B1418/18 and B1461/61 are stored simultaneously, there may be a malfunction in the smog ventilation sensor power source circuit.

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine 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.

      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 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - IG POWER SOURCE AND BODY GROUND)


    1. Disconnect the B6 smog ventilation sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      B6-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      B6-3 (IG) - Body ground Engine switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B6-6 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the O10 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B6-1 (SG) - O10-32 (SG-2) Always Below 1 Ω
      B6-4 (DGS1) - O10-25 (DGS1) Always Below 1 Ω
      O10-32 (SG-2) - Body ground Always 10 kΩ or higher
      O10-25 (DGS1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SMOG VENTILATION SENSOR


    1. B007453C02
      *a

      Component without harness connected

      (Smog Ventilation Sensor)

      Remove the smog ventilation sensor.

      Click here

    2. Connect a positive (+) lead from the battery to terminal 3 (IG) and a negative (-) lead to terminal 6 (E).

    3. Allow exhaust gas (NOx) to travel to the sensing portion of the smog ventilation sensor, and measure the resistance between terminals 1 (SG) and 4 (DGS1).

      OK
      When the sensor is exposed to exhaust gas, the resistance increases.

      Tech Tips

      The resistance of the sensor before being exposed to exhaust gas is 10 kΩ to 40 kΩ.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE SMOG VENTILATION SENSOR Click here