AIR CONDITIONING SYSTEM, Diagnostic DTC:B1461/61

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 modes. The smog ventilation sensor detects components of the exhaust gasses (NOx) and transmits a signal to the air conditioning amplifier assembly.

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

   READ VALUE USING GTS

   
   

   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.

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

      Table 1. Air Conditioner

      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

   
   
   • AClick here
   • B

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

   • C

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

2. Click here

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

   
   

   1. Disconnect the A6 smog ventilation sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition A6-3 (IG) - Body ground Power switch on (IG) 11 to 14 V A6-3 (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 A6-6 (E) - Body ground Always Below 1 Ω

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

3. Click here

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

   
   

   1. Disconnect the H54 and H55 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A6-1 (SG) - H54-13 (SG-2) Always Below 1 Ω A6-4 (DGS1) - H55-4 (DGS1) Always Below 1 Ω A6-1 (SG) - Body ground Always 10 kΩ or higher A6-4 (DGS1) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

4. Click here

   INSPECT SMOG VENTILATION SENSOR

   
   
   1. 

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

   2. 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 the exhaust gas, the resistance increases.

      Tip:

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

      Table 2. Text in Illustration

      *a	Component without harness connected (Smog Ventilation Sensor)

   
   
   • OK

     REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

   • NG

     REPLACE SMOG VENTILATION SENSOR (Click here)