AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B14B8
| DTC Code | DTC Name |
|---|---|
| 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. |
|
CAUTION / NOTICE / HINT
If DTC B1423/23 and B14B8 are output at the same time, troubleshoot for DTC B1423/23 first (Click here).
PROCEDURE
CHECK FOR AIR CONDITIONING SYSTEM LEAK
Install a manifold gauge set.
Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.
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.
REPAIR AIR CONDITIONING SYSTEM LEAKClick here
CHARGE SYSTEM WITH REFRIGERANT
Add an appropriate amount of refrigerant.
for HFC-134a(R134a):Click here
for HFO-1234yf(R1234yf):Click here
CHECK FOR DTC
Check for DTCs when the following conditions are met (Click here).
Table 1. 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.
END
REPLACE COOLER EXPANSION VALVE
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.
CHARGE SYSTEM WITH REFRIGERANT
Add an appropriate amount of refrigerant.
for HFC-134a(R134a):Click here
for HFO-1234yf(R1234yf):Click here
CHECK FOR DTC
Check for DTCs when the following conditions are met (Click here).
Table 2. 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.
END
REPAIR AIR CONDITIONING SYSTEM LEAK
Identify the area where refrigerant leaks.
for HFC-134a(R134a):Click here
for HFO-1234yf(R1234yf):Click here
Repair the identified area of the air conditioning system.
Evacuate the air conditioning system.
CHARGE SYSTEM WITH REFRIGERANT
Add an appropriate amount of refrigerant.
for HFC-134a(R134a):Click here
for HFO-1234yf(R1234yf):Click here
CHECK FOR DTC
Check for DTCs when the following conditions are met (Click here).
Table 3. 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.
END
REPLACE COOLER EXPANSION VALVE
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.
CHARGE SYSTEM WITH REFRIGERANT
Add an appropriate amount of refrigerant.
for HFC-134a(R134a):Click here
for HFO-1234yf(R1234yf):Click here
CHECK FOR DTC
Check for DTCs when the following conditions are met (Click here).
Table 4. 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.
END