- Refrigerant pipe line
- Cooler expansion valve
- Air conditioning amplifier
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000ZPDE |
| Model Year Start: 2017 | Model: Sienna | Prod Date Range: [08/2016 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B14B8; Refrigerant Shortage; 2017 - 2020 MY Sienna [08/2016 - ] | ||
|
DTC |
B14B8 |
Refrigerant Shortage |
DESCRIPTION
This DTC is stored if the refrigerant is insufficient in the cycle.
The air conditioning amplifier receives the ambient temperature signal, refrigerant pressure signal etc. from the various sensors.
Based on these signals, the air conditioning amplifier 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
HINT:
If DTC B1423/23 and B14B8 are output at the same time, troubleshoot for DTC B1423/23 first.
Click here
![2017 - 2020 MY Sienna [08/2016 - ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1423/23; Pressure Sensor Circuit](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK FOR AIR CONDITIONING SYSTEM LEAK |
(a) Install a manifold gauge set.
(b) Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.
(c) 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.
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK |
B |
| B |
|
|
|
2. |
REPAIR AIR CONDITIONING SYSTEM LEAK |
(a) Identify the area where refrigerant leaks.
Click here
(b) Repair the identified area of the air conditioning system.
(c) Evacuate the air conditioning system.
|
|
3. |
CHARGE REFRIGERANT |
(a) Add an appropriate amount of refrigerant.
Click here
|
|
4. |
CHECK FOR DTC |
(a) Check for DTCs when the following conditions are met (See page
).
Measurement Condition
|
Item |
Condition |
|---|---|
|
Engine condition |
Engine running |
|
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 |
- *: 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 |
|
|
5. |
REPLACE COOLER EXPANSION VALVE |
(a) Replace the cooler expansion valve with a new or normally functioning one.
HINT:
Replace the cooler expansion valve with a new or normally functioning one because the cooler expansion valve is either stuck or clogged.
|
|
6. |
CHARGE REFRIGERANT |
(a) Add an appropriate amount of refrigerant.
Click here
|
|
7. |
CHECK FOR DTC |
(a) Check for DTCs when the following conditions are met (See page
).
Measurement Condition
|
Item |
Condition |
|---|---|
|
Engine condition |
Engine running |
|
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 |
- *: 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 |
|
| B |
|
END |
|
|