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Home >> Toyota >> 2014 >> Corolla LE >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning System (Auto A/C) - Diagnostics - Introduction (Model Code: ZRE172) >> AIR CONDITIONING SYSTEM (For Automatic Air Conditioning System) >> Check Mode Procedure [08/2013 - 08/2016] >> Check Mode Procedure [08/2013 - 08/2016]
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Check Mode Procedure [08/2013 - 08/2016]

  1. REFRIGERANT SHORTAGE CHECK IN NORMAL OPERATION (CHECK A/C SWITCH INDICATOR AND DTC) 
    1. Start the engine.
    2. Check that the A/C switch indicator remains on when the following conditions are met.
      Fig 1: A/C Switch Indicator Remains On
      GTY438167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      MEASUREMENT CONDITION

      Item Condition
      A/C switch On
      Air conditioning operation time 15 minutes or more
      Ambient temperature* 0 to 49°C (32 to 120°F)
      Engine coolant temperature 45°C (113°F) or more

      *: If the ambient temperature is not within the range shown, do not perform this check.

      HINT: 

      The A/C switch indicator and air conditioning system turn off if the amount of refrigerant in the system is insufficient.

    3. Connect the Techstream to the DLC3.
    4. Check for DTC B14B8.
      RESULT

      Result Amount of Refrigerant Corrective Action
      DTC B14B8 is output Empty or nearly empty Check for refrigerant leaks using a halogen leak detector, and repair if necessary.
      Refer to REPLACEMENT [08/2013 - ]
      DTC B14B8 is not output Correct or insufficient Perform a refrigerant shortage check using the Techstream.
  2. REFRIGERANT SHORTAGE CHECK USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.
    5. According to the display on the Techstream, perform the refrigerant shortage check when the following conditions are met.

      Body Electrical > Air Conditioner > Utility 

      Tester Display
      Refrigerant Gas Volume Check
      MEASUREMENT CONDITION

      Item Condition
      A/C switch On
      Ambient temperature* 0 to 49°C (32 to 120°F)
      Blower speed HI

      *: If the ambient temperature is not within the range shown, do not perform this check.

      HINT: 

      • Refer to the Techstream operator's manual for further details.
      • A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
      • DTCs are not stored when performing the refrigerant shortage check using the Techstream.
      RESULT

      Result Amount of Refrigerant Corrective Action
      Refrigerant shortage Insufficient or leakage
      1. Check for refrigerant leaks using a halogen leak detector, and repair if necessary.

        Refer to REPLACEMENT [08/2013 - ]

      2. Evacuate the air conditioning system and charge it with the appropriate volume of new or purified refrigerant.
      Refrigerant correct Correct -
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