AIR CONDITIONING SYSTEM, Diagnostic DTC:B14B8

DTC Code DTC Name
B14B8 Refrigerant Shortage

DESCRIPTION

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14B8 Refrigerant Shortage

When the following condition is detected using the refrigerant gas volume check in normal operation:

The amount of refrigerant is insufficient.

  • Refrigerant pipe line

  • Cooler expansion valve

  • Air conditioning amplifier assembly

 Memorized (15 minutes or more)

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 brackets.

PROCEDURE


  1. CHECK FOR AIR CONDITIONING SYSTEM LEAK


    1. Install a manifold gauge set.

    2. Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.

    3. Evacuate the air conditioning system and check that vacuum can be maintained in it.

      OK
      Vacuum can be maintained in the air conditioning system.

      Tech Tips

      If vacuum cannot be maintained in the air conditioning system, refrigerant may be leaking from it. In this case, it is necessary to repair or replace the leaking part of the air conditioning system.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR AIR CONDITIONING SYSTEM LEAK Click here

    OK

  2. CHARGE SYSTEM WITH REFRIGERANT


    1. Add an appropriate amount of refrigerant.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs when the following conditions are met.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Measurement Condition
      Item Condition
      A/C Switch On
      Blower speed Lo or more
      Air conditioning operation time 15 minutes or more
      Ambient temperature* 0 to 49°C (32 to 120°F)
      FC coolant temperature 45°C (113°F) or higher

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

      Result
      Result Proceed to
      DTC B14B8 is not output A
      DTC B14B8 is output B

    A

    END

    B

  4. REPLACE COOLER EXPANSION VALVE


    1. Replace the cooler expansion valve with a new or known good one.

      Click here

      Tech Tips

      Replace the cooler expansion valve with a new or known good one because the cooler expansion valve is either stuck or clogged.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHARGE SYSTEM WITH REFRIGERANT


    1. Add an appropriate amount of refrigerant.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs when the following conditions are met.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Measurement Condition
      Item Condition
      A/C Switch On
      Blower speed Lo or more
      Air conditioning operation time 15 minutes or more
      Ambient temperature* 0 to 49°C (32 to 120°F)
      FC coolant temperature 45°C (113°F) or higher

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

      Result
      Result Proceed to
      DTC B14B8 is not output A
      DTC B14B8 is output B

    A

    END (COOLER EXPANSION VALVE WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  7. REPAIR AIR CONDITIONING SYSTEM LEAK


    1. Identify the area where refrigerant leaks.

      Click here

    2. Repair the identified area of the air conditioning system.

    3. Evacuate the air conditioning system.

      Result
      Proceed to
      NEXT

    NEXT

  8. CHARGE SYSTEM WITH REFRIGERANT


    1. Add an appropriate amount of refrigerant.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs when the following conditions are met.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Measurement Condition
      Item Condition
      A/C Switch On
      Blower speed Lo or more
      Air conditioning operation time 15 minutes or more
      Ambient temperature* 0 to 49°C (32 to 120°F)
      FC coolant temperature 45°C (113°F) or higher

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

      Result
      Result Proceed to
      DTC B14B8 is not output A
      DTC B14B8 is output B

    A

    END (COOLER EXPANSION VALVE WAS DEFECTIVE)

    B

  10. REPLACE COOLER EXPANSION VALVE


    1. Replace the cooler expansion valve with a new or known good one.

      Click here

      Tech Tips

      Replace the cooler expansion valve with a new or known good one because the cooler expansion valve is either stuck or clogged.

      Result
      Proceed to
      NEXT

    NEXT

  11. CHARGE SYSTEM WITH REFRIGERANT


    1. Add an appropriate amount of refrigerant.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CHECK FOR DTC


    1. Clear the DTC.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs

    2. Check for DTCs when the following conditions are met.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Measurement Condition
      Item Condition
      A/C Switch On
      Blower speed Lo or more
      Air conditioning operation time 15 minutes or more
      Ambient temperature* 0 to 49°C (32 to 120°F)
      FC coolant temperature 45°C (113°F) or higher

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

      Result
      Result Proceed to
      DTC B14B8 is not output A
      DTC B14B8 is output B

    A

    END (COOLER EXPANSION VALVE WAS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here