Dtc B14B8 Refrigerant Shortage

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

SYSTEM DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR AIR CONDITIONING SYSTEM LEAK

CHARGE SYSTEM WITH REFRIGERANT

CHECK FOR DTC

REPLACE COOLER EXPANSION VALVE

CHARGE SYSTEM WITH REFRIGERANT

CHECK FOR DTC

REPAIR AIR CONDITIONING SYSTEM LEAK

CHARGE SYSTEM WITH REFRIGERANT

CHECK FOR DTC

REPLACE COOLER EXPANSION VALVE

CHARGE SYSTEM WITH REFRIGERANT

CHECK FOR DTC

DTC B14B8 Refrigerant Shortage


SYSTEM 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.
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.
  1. Refrigerant pipe line
  2. Cooler expansion valve
  3. Air conditioning amplifier assembly

INSPECTION PROCEDURE

HINT:
If DTC B1423/23 and B14B8 are output at the same time, troubleshoot for DTC B1423/23 first (Click here).
1.CHECK FOR AIR CONDITIONING SYSTEM LEAK

  1. Install a manifold gauge set.

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

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

    OK:
    Vacuum can be maintained in the air conditioning system.
    HINT:
    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.


NG
Go to step 7
OK


2.CHARGE SYSTEM WITH REFRIGERANT

  1. Add an appropriate amount of refrigerant (Click here).


NEXT


3.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 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.

    OK:
    DTC B14B8 is not output.


NG
Go to step 4
OK

END

4.REPLACE COOLER EXPANSION VALVE

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

    1. for LHD: Click here
    2. for RHD: Click here
    HINT:
    Replace the cooler expansion valve with a new or known good one because the cooler expansion valve is either stuck or clogged.

NEXT


5.CHARGE SYSTEM WITH REFRIGERANT

  1. Add an appropriate amount of refrigerant (Click here).


NEXT


6.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 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.

    OK:
    DTC B14B8 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END

7.REPAIR AIR CONDITIONING SYSTEM LEAK

  1. Identify the area where refrigerant leaks (Click here).

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

  1. Evacuate the air conditioning system.


NEXT


8.CHARGE SYSTEM WITH REFRIGERANT

  1. Add an appropriate amount of refrigerant (Click here).


NEXT


9.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 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.

    OK:
    DTC B14B8 is not output.


NG
Go to step 10
OK

END

10.REPLACE COOLER EXPANSION VALVE

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

    1. for LHD: Click here
    2. for RHD: Click here
    HINT:
    Replace the cooler expansion valve with a new or known good one because the cooler expansion valve is either stuck or clogged.

NEXT


11.CHARGE SYSTEM WITH REFRIGERANT

  1. Add an appropriate amount of refrigerant (Click here).


NEXT


12.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 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.

    OK:
    DTC B14B8 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END