AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B14B8

DTC Code DTC Name
B14B8 Refrigerant Shortage

SYSTEM DESCRIPTION

This DTC is stored if the refrigerant is insufficient in the cycle.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal etc. from the 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. DTC Detection Condition Trouble Area
B14B8

When the following conditions is detected using the refrigerant shortage check in normal operation :

The amount of refrigerant is insufficient.

  • Refrigerant pipe line

  • Cooler expansion valve

  • Air conditioning amplifier assembly

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
      Result Proceed to
      NG A
      OK B

    B

    CHARGE REFRIGERANT Click here

    A

  2. 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.


    NEXT

  3. CHARGE REFRIGERANT


    1. Add an appropriate amount of refrigerant Click here.


    NEXT

  4. CHECK FOR DTC


    1. Check for DTCs when the following conditions are met Click here.

      Measurement Condition
      Item Condition
      A/C Switch ON
      A/C Driving Time 15 minutes or more
      Ambient Temperature 0 to 49°C (32 to 120°F)
      Engine Coolant Temperature 45°C (113°F) or more
      Result
      Result Proceed to
      NG A
      OK B

    B

    END

    A

  5. REPLACE COOLER EXPANSION VALVE


    1. Replace the cooler expansion valve with a new or normally functioning one.

      Tech Tips

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


    NEXT

  6. CHARGE REFRIGERANT


    1. Add an appropriate amount of refrigerant Click here.


    NEXT

  7. CHECK FOR DTC


    1. Check for DTCs when the following conditions are met Click here.

      Measurement Condition
      Item Condition
      A/C Switch ON
      A/C Driving Time 15 minutes or more
      Ambient Temperature 0 to 49°C (32 to 120°F)
      Engine Coolant Temperature 45°C (113°F) or more
      Result
      Result Proceed to
      NG A
      OK B

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    B

    END