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

Note

B14B8

Refrigerant Shortage

When the following conditions 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)

-
Tip:

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.

CAUTION / NOTICE / HINT

Note:

When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

Click here

Tip:

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

    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

      Table 1. 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 higher

      Engine condition

      Engine running

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

      OK

      DTC B14B8 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END

    NG

  4. REPLACE COOLER EXPANSION VALVE

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

      Click 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.

    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

      Table 2. 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 higher

      Engine condition

      Engine running

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

      OK

      DTC B14B8 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (COOLER EXPANSION VALVE IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

  7. REPAIR AIR CONDITIONING SYSTEM LEAK

    1. Identify the area where refrigerant leaks.

    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.

    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

      Table 3. 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 higher

      Engine condition

      Engine running

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

      OK

      DTC B14B8 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (COOLER EXPANSION VALVE IS DEFECTIVE)

    NG

  10. REPLACE COOLER EXPANSION VALVE (COOLER EXPANSION VALVE IS DEFECTIVE)

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

      Click 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.

    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

      Table 4. 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 higher

      Engine condition

      Engine running

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

      OK

      DTC B14B8 is not output.

    Result

    Proceed to

    OK

    NG
    OK

    END (COOLER EXPANSION VALVE IS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here