AIR CONDITIONING SYSTEM Recirculated/Fresh Air Modes Switch without User Input

DESCRIPTION

If fresh/recirculation mode changes unintentionally and without permission, the following causes are possible.

PROCEDURE

1. CHECK CUSTOMIZE SETTING

   
   

   1. Use the following customize setting methods to confirm that the automatically fresh/recirculation mode is "ON". If the setting is on, select the setting to "OFF".

      Click here

      
      

      • Check setting using GTS

      • Check setting by multi-display

      OK
      Cutomize setteing is "OFF".

      Result
      Proceed to OK NG

   
   

   NG

   CHANGE CUSTOMIZE SETTING IS ON

   OK

2. READ VALUE USING GTS (EMISSION GAS SENSNOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Allow exhaust gas (HC, CO) 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.

      
      Body Electrical > Air Conditioner > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Emission Gas Sensor	Emission gas (HC, CO)	Min.: 0 Max.: 255	Smog ventilation sensor value increases as gas amount increases	Smog ventilation sensor malfunction

      
      Body Electrical > Air Conditioner > Data List

      Tester Display
      Emission Gas Sensor

      OK
      The display is as specified in the normal condition column.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   NG

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. READ VALUE USING GTS (AMBIENT TEMP SENSOR)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

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

   5. Read the Data List according to the display on the GTS.

      
      Body Electrical > Air Conditioner > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Ambient Temp Sensor	Thermistor assembly	Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F)	Actual ambient temperature displayed	Thermistor assembly system malfunction When open circuit: -23.30°C (-9.94°F) When short circuit: 65.95°C (150.71°F)

      
      Body Electrical > Air Conditioner > Data List

      Tester Display
      Ambient Temp Sensor

      OK
      The value of the display does not change frequently.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM Click here

   OK

5. READ VALUE USING GTS (COOLRANT TEMPERATURE)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Body Electrical / Engine / Data List.

   5. Read the Data List according to the display on the GTS.

      
      Powertrain > Engine

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. Tech Tips After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

      
      Powertrain > Engine > Data List

      Tester Display
      Coolant Temperature

      OK
      The value of the display does not change frequently.

      Result
      Proceed to OK NG

   
   

   NG

   GO TO COOLING SYSTEM Click here

   OK

6. CHECK REFRIGERANT PRESSURE

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

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

   5. Read the Data List according to the display on the GTS.

      
      Body Electrical > Air Conditioner > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Regulator Pressure Sensor	Air conditioner pressure sensor	Min.: -0.4566 MPaG Max.: 3.2943 MPaG	Actual refrigerant pressure displayed	Refrigerant line (gad leak etc.) Air conditioner pressure sensor system malfunction

      
      Body Electrical > Air Conditioner > Data List

      Tester Display
      Regulator Pressure Sensor

   6. Install a manifold gauge set.

      
      

      • for HFC-134a (R134a): Click here

      • for HFO-1234yf (R1234yf): Click here

   7. Read the manifold gauge pressure when the following conditions are met.

      
      

      1. Prepare the vehicle according to the table below.

         Measurement Condition:

         Item	Condition
         Vehicle doors	Fully open
         Temperature setting	MAX COLD
         Blower speed	HI
         A/C switch	On
         Recirculation/fresh switch	RECIRCULATION
         Interior temperature	25 to 35°C (77 to 95°F)

      Standard Pressure
      Low pressure side
      150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)
      High pressure side
      1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)

   8. Compare the values displayed in the Data List and on the manifold gauge.

      OK
      The values displayed in the Data List and on the manifold gauge match.

      Result
      Proceed to OK NG

   
   

   OK

   GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE) Click here

   NG

   GO TO PRESSURE SENSOR CIRCUIT Click here