AIR CONDITIONING SYSTEM, Diagnostic DTC:B1461/61

DTC Code DTC Name
B1461/61 Emission Gas NOx Sensor Circuit

DESCRIPTION

The smog ventilation sensor, which is installed on the front of the cooler condenser assembly, automatically changes to fresh, fresh/recirculation or recirculation mode operation. The smog ventilation sensor detects NOx in the emission gas and transmits signals to the air conditioning amplifier assembly.

DTC Code DTC Detection Condition Trouble Area
B1461/61 An open or short in the smog ventilation sensor circuit (NOx).

  • Smog ventilation sensor

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

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01EQEUE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (A/C IG)


    1. Remove the A/C IG fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A/C IG fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. READ VALUE USING INTELLIGENT TESTER (SMOG VENTILATION SENSOR)


    1. Use the Data List to check if the smog ventilation sensor is functioning properly.

      Air Conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Emission Gas Nox Sensor

      Smog ventilation sensor/

      Min.: 0, Max.: 255

      		 Increases as gas amount increases -
      OK
      The display is as specified in the normal condition.

    NG

    CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BODY GROUND) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

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

    A01ES3KE03

    1. Disconnect the A45 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A45-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SMOG VENTILATION SENSOR - BATTERY)

    A01ES3KE04

    1. Disconnect the A45 smog ventilation sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A45-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT SMOG VENTILATION SENSOR

    A01ES1ME02

    1. Remove the smog ventilation sensor Click here.

    2. After applying battery voltage to terminals 3 (IG) and 6 (E) for more than 30 seconds, measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (SG) - 4 (DGS1)

      15 to 25°C

      (59 to 77°F)

      		 2.5 to 40 kΩ

      Tech Tips

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


    NG

    REPLACE SMOG VENTILATION SENSOR Click here

    OK

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

    A01ES64E03

    1. Disconnect the A45 smog ventilation sensor connector.

    2. Disconnect the E35 amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A45-1 (SG) - E35-30 (SG-4) Always Below 1 Ω
      A45-4 (DGS1) - E35-24 (DGS1)
      E35-30 (SG-4) - Body ground Always 10 kΩ or higher
      E35-24 (DGS1) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here