Toyota Yaris: Air Conditioning System / Recirculated/Fresh Air Modes Switch without User Input
DESCRIPTION
If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible.
| Symptom | Factor |
|---|---|
|
|
PROCEDURE
| 1. | CHECK CUSTOMIZE SETTING (EFFICIENT VENTILATION MODE) |
(a) Using the GTS, check that the customize setting Efficient Ventilation Mode is not set to "ON".
Air Conditioner| Tester Display | Description | Default | Setting | ECU |
|---|---|---|---|---|
| Efficient Ventilation Mode | Function to change the mode automatically to recirculation air mode when turning the A/C on to cool the cabin quickly | ON | $00:OFF,$01:ON | Air conditioning amplifier assembly |
OK:
Efficient Ventilation Mode is not set to "ON".
| NG |
 | CUSTOMIZE SETTING |
|
| 2. | READ VALUE USING GTS (AMBIENT TEMPERATURE SENSOR) |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Air Conditioner > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Ambient Temperature Sensor | Thermistor assembly | Min.: -327.68°C (-557.82°F) Max.: 327.67°C (621.81°F) | Actual ambient temperature displayed | Thermistor assembly circuit malfunction |
| Tester Display |
|---|
| Ambient Temperature Sensor |
OK:
The value of the display does not change frequently.
| NG |
 | GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM |
|
| 3. | READ VALUE USING GTS (COOLANT TEMPERATURE) |
(a) Read the Data List according to the display on the GTS.
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:
|
| Tester Display |
|---|
| Coolant Temperature |
OK:
The value of the display does not change frequently.
| NG |
 | GO TO COOLING SYSTEM |
|
| 4. | CHECK REFRIGERANT PRESSURE |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Air Conditioner > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Regulator Pressure Sensor | Air conditioner pressure sensor | Min.: -32.768 MPaG Max.: 32.767 MPaG | Actual refrigerant pressure displayed |
|
| Tester Display |
|---|
| Regulator Pressure Sensor |
(b) Install a manifold gauge set.
(c) 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) |
(d) 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 |
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