DESCRIPTION If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible. |
Symptom | Factor |
- Recirculation/fresh mode changes without permission
- Recirculation/fresh mode light blinks
|
- Customize setting*
- Change in ambient air temperature
- Decrease in refrigerant pressure
- Air conditioner pressure sensor circuit malfunction
- Engine coolant temperature (high)
|
PROCEDURE
| Result |
Proceed to | | for USA and Canada |
A | | except USA and Canada |
B |
| A |
 | GO TO STEP 3 |
|
B |
 | |
| 2. |
CHECK CUSTOMIZE SETTING | (a) Using the Techstream, check that the customize setting Air Inlet Mode is not set to "Automatic". Air Conditioner
|
Tester Display | Description |
Default | Setting |
ECU | | Air Inlet Mode |
Function to change the mode automatically to recirculation air mode when turning the A/C on to cool the cabin quickly |
Automatic | 0:Automatic,1:Manual |
Air conditioning amplifier assembly |
OK: Air Inlet Mode is not set to "Automatic".
| NG |
| CUSTOMIZE SETTING |
|
OK | |
| |
| 3. |
READ VALUE USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Read the Data List according to the display on the Techstream. Body Electrical > Air Conditioner > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Ambient Temp Sensor | Thermistor assembly |
Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F) |
Actual ambient temperature displayed |
Thermistor assembly circuit malfunction
- When open circuit: -23.30°C (-9.94°F)
- When short circuit: 65.95°C (150.71°F)
| Body Electrical > Air Conditioner > Data List
|
Tester Display | | Ambient Temp Sensor |
OK: The value of the display does not change frequently.
| NG |
| GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM |
|
OK | |
| |
| 4. |
READ VALUE USING TECHSTREAM | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List. (e) Read the Data List according to the display on the Techstream. Powertrain > Engine > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Coolant Temperature | Engine coolant temperature |
Min.: -40°C (-40°F), Max.: 140°C (284°F) |
75 to 100°C (167 to 212°F): After warming up |
This is the engine coolant temperature.
HINT:
- After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
- After a long soak, the engine coolant temperature, intake air
temperature and ambient air temperature will be approximately equal.
- If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
- Check if the engine overheats if the value indicated is higher than 135°C (275°F).
| Powertrain > Engine > Data List
|
Tester Display | | Coolant Temperature |
OK: The value of the display does not change frequently.
| NG |
| GO TO COOLING SYSTEM |
|
OK | |
| |
| 5. |
CHECK REFRIGERANT PRESSURE | (a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG). (c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.
(e) Read the Data List according to the display on the Techstream. Body Electrical > Air Conditioner > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Regulator Pressure Sensor |
Air conditioner pressure sensor |
Min.: -66.2 psi (gauge) Max.: 478.0 psi (gauge) |
Actual refrigerant pressure displayed |
- Refrigerant line (gas leak etc.)
- Air conditioner pressure sensor circuit malfunction
| Body Electrical > Air Conditioner > Data List
|
Tester Display | | Regulator Pressure Sensor |
(f) Install a manifold gauge set. (g) Read the manifold gauge pressure when the following conditions are met.
(1) Prepare the vehicle according to the table below. Measurement Condition: |
Item | Condition | |
Vehicle doors | Fully open | |
Temperature setting | MAX COLD | |
Blower speed | HI | |
A/C switch | On | |
Recirculation/fresh switch |
RECIRCULATION | |
Interior temperature |
25 to 35°C (77 to 95°F) | Standard Pressure:
Low pressure side 150 to 250 kPa (1.5 to 2.5 kgf/cm2, 22 to 36 psi)
High pressure side 1370 to 1570 kPa (14 to 16 kgf/cm2, 199 to 228 psi)
(h) Compare the values displayed in the Data List and on the manifold gauge.
OK: The values displayed in the Data List and on the manifold gauge match.
| OK |
| GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE) |
| NG |
| REPLACE AIR CONDITIONER PRESSURE SENSOR | | 
