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Check for refrigerant leaks using a gas leak detector, and repair if necessary.
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- Evacuate the air conditioning system and charge it with the appropriate volume of new or purified refrigerant.
Lexus NX: Check Mode Procedure
Lexus NX Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / Check Mode Procedure
CHECK MODE PROCEDURE
REFRIGERANT GAS VOLUME CHECK IN NORMAL OPERATION (CHECK A/C SWITCH INDICATOR AND DTC)
| *a | Example |
(a) Turn the power switch on (READY).
(b) Check that A/C switch indicator remains on when the following conditions are met.
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 higher |
*: If the ambient temperature is not within the range shown, do not perform this check.
HINT:
The A/C switch indicator and air conditioning system turn off if the amount of refrigerant in the system is insufficient.
(c) Connect the Techstream to the DLC3.
(d) Check for DTC B14B8.
Body Electrical > Air Conditioner > Trouble Codes Result| Result | Amount of Refrigerant | Corrective Action |
|---|---|---|
| DTC B14B8 is output | Empty or nearly empty | Check for refrigerant leaks using a gas leak detector, and repair if necessary. |
| DTC B14B8 is not output | Correct or insufficient | Perform a refrigerant gas volume check using the Techstream. |
REFRIGERANT GAS VOLUME CHECK USING THE TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (READY).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.
(e) According to the display on the Techstream, perform the refrigerant gas volume check when the following conditions are met.
Measurement Condition| Item | Condition |
|---|---|
| *: If the ambient temperature is not within the range shown, do not perform this check. | |
| A/C Switch | On |
| Ambient temperature* | 0 to 49°C (32 to 120°F) |
| R/F Switch | Fresh (Ambient temperature is 31°C (87°F) or higher) |
| Recirculation (Ambient temperature is 30°C (86°F) or less) | |
| Blower Speed | HI |
| Tester Display |
|---|
| Refrigerant Gas Volume Check |
HINT:
- Refer to the Techstream operator's manual for further details.
- A message indicating a refrigerant gas volume is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
- DTCs are not stored when performing the refrigerant gas volume check using the Techstream.
| Result | Amount of Refrigerant | Corrective Action |
|---|---|---|
| Refrigerant shortage | Insufficient or leakage | |
| Refrigerant correct | Correct | - |
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