AIR CONDITIONING SYSTEM(for Automatic 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 in refrigerant shortage check in normal operation:

Amount of refrigerant is insufficient

  • Refrigerant pipe line

  • Cooler expansion valve

  • Air conditioning amplifier assembly

Memorized

(15 min. or more)*

  • *: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.

CAUTION / NOTICE / HINT

Tip:

If DTC B1423/23 and B14B8 are output at the same time, troubleshoot for DTC B1423/23 first.

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.

      Tip:

      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 LEAKClick here

    OK

  2. CHARGE SYSTEM WITH REFRIGERANT

    1. Add an appropriate amount of refrigerant.

      for HFC-134a (R134a):Click here

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

    Result

    Proceed to

    NEXT
    NEXT

  3. CHECK FOR DTC

    1. 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

      A/C 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

      Engine condition

      Engine running

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

    Result

    Result

    Proceed to

    DTC B14B8 is output

    A

    DTC B14B8 is not output

    B
    B

    END

    A

  4. REPLACE COOLER EXPANSION VALVE

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

      Click hereClick here

      Tip:

      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.

      for HFC-134a (R134a):Click here

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

    Result

    Proceed to

    NEXT
    NEXT

  6. CHECK FOR DTC

    1. 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

      A/C 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

      Engine condition

      Engine running

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

    Result

    Result

    Proceed to

    DTC B14B8 is output

    A

    DTC B14B8 is not output

    B
    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    B

    END

  7. REPAIR AIR CONDITIONING SYSTEM LEAK

    1. Identify the area where refrigerant leaks.

      for HFC-134a (R134a):Click here

      for HFO-1234yf (R1234yf):Click hereClick 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.

      for HFC-134a (R134a):Click here

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

    Result

    Proceed to

    NEXT
    NEXT

  9. CHECK FOR DTC

    1. 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

      A/C 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

      Engine condition

      Engine running

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

    Result

    Result

    Proceed to

    DTC B14B8 is output

    A

    DTC B14B8 is not output

    B
    B

    END

    A

  10. REPLACE COOLER EXPANSION VALVE

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

      Click hereClick here

      Tip:

      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.

      for HFC-134a (R134a):Click here

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

    Result

    Proceed to

    NEXT
    NEXT

  12. CHECK FOR DTC

    1. 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

      A/C 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

      Engine condition

      Engine running

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

    Result

    Result

    Proceed to

    DTC B14B8 is output

    A

    DTC B14B8 is not output

    B
    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    B

    END