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 exhaust gasses and transmits signals to the air conditioning amplifier assembly.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory Note
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

 Memorized -

Tech Tips

The air conditioning amplifier assembly stores the DTC of the respective malfunction if it has occurred for the period of time indicated in the parentheses.

WIRING DIAGRAM

B006PZIE01

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 related circuits.

  • When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    Click here

PROCEDURE


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


    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 Smog ventilation sensor malfunction (emission gas [NOx] detected)
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here

    B

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

    C

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


    1. B006Q0FC02
      *a

      Front view of 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
      A25-6 (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
      A25-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      A25-3 (IG) - Body ground Engine 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 A25 smog ventilation sensor connector.

    2. Disconnect the G36 and G38 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A25-1 (SG) - G36-35 (SG-5) Always Below 1 Ω
      A25-4 (DGS1) - G38-4 (DGS) Always Below 1 Ω
      A25-1 (SG) or G36-35 (SG-5) - Body ground Always 10 kΩ or higher
      A25-4 (DGS1) or G38-4 (DGS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY for LHD: Click here for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR