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 and is used to control automatic switching between recirculation and fresh air modes. The smog ventilation sensor detects components of the exhaust gas (NOx) and transmits a signal to the air conditioning amplifier assembly.

DTC Code DTC Detection Condition Trouble Area
B1461/61 Short in smog ventilation sensor circuit (NOx)

  • Smog ventilation sensor

  • Harness or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01FS9WE06

INSPECTION PROCEDURE

Note


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

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

  • Before disconnecting the cable form the negative (-) battery terminal or replacing the air conditioning amplifier assembly, record the last operation state of the air conditioning for each transmitter. After replacement, it is necessary to perform memory registration for each transmitter Click here.

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

    5. Check the value(s) by referring to the table below.

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

      Smog ventilation sensor /

      Min.: 0, Max.: 255

      		 Displays concentration of exhaust gas (NOx) around smog ventilation sensor (increases when concentration of exhaust gas 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 - BATTERY AND BODY GROUND)


    1. A01FRI4E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Smog Ventilation Sensor)

      Disconnect the 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
      B14-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      B14-3 (IG) - Body ground Power 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
      B14-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the N157 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
      B14-1 (SG) - N157-32 (SG-2) Always Below 1 Ω
      B14-4 (DGS1) - N157-25 (DGS1) Always Below 1 Ω
      B14-1 (SG) - Body ground Always 10 kΩ or higher
      B14-4 (DGS1) - Body ground Always 10 kΩ or higher
      B14-1 (SG) - B14-4 (DGS1) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SMOG VENTILATION SENSOR


    1. Remove the smog ventilation sensor Click here.

    2. Inspect the smog ventilation sensor Click here.


    NG

    REPLACE SMOG VENTILATION SENSOR Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here