- Recirculation/fresh mode changes without permission
- Recirculation/fresh mode light blinks
| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z4N |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Recirculated/Fresh Air Modes Switch without User Input; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] | ||
|
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. |
READ VALUE USING GTS |
(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 |
|---|---|---|---|---|
|
Efficient Ventilation Mode |
Function to automatically change ambient air induction and room circulation is set. |
OFF / ON |
Customized value displayed |
- |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
|---|
|
Efficient Ventilation Mode |
|
Result |
Proceed to |
|---|---|
|
Efficient Ventilation Mode is set to "OFF" |
A |
|
Efficient Ventilation Mode is set to "ON" |
B |
| B |
|
CUSTOMIZE SETTING (Efficient Ventilation Mode to "OFF") |
|
|
2. |
READ VALUE USING GTS |
(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 |
Ambient temp. sensor (thermistor assembly) |
-327.68 to 327.67°C |
Actual ambient temperature displayed |
Ambient temp. sensor (thermistor assembly) circuit malfunction |
Body Electrical > Air Conditioner > Data List
|
Tester Display |
|---|
|
Ambient Temperature Sensor |
OK:
The value of the display does not change frequently.
| NG |
|
GO TO OTHER DIAGNOSIS PROCEDURE (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:
|
Powertrain > Engine > Data List
|
Tester Display |
|---|
|
Coolant Temperature |
OK:
The value of the display does not change frequently.
| NG |
|
|
|
4. |
CHECK REFRIGERANT PRESSURE |
(a) Install a manifold gauge set.
for HFC-134a(R134a): Click here
![2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): ON-VEHICLE INSPECTION](/t3Portal/stylegraphics/info.gif)
for HFO-1234yf(R1234yf): Click here
(b) Prepare the vehicle according to the table below.
Measurement Condition:
|
Item |
Condition |
|---|---|
|
Doors |
Fully open |
|
A/C Switch |
On |
|
Recirculation/fresh Control Switch |
Recirculation |
|
Set Temperature |
MAX COLD |
|
Blower Speed |
HI |
|
Air Conditioning Air Inlet Temperature |
25 to 35°C (77 to 95°F) |
(c) Compare the values displayed in the Data List and on the manifold gauge.
Body Electrical > Air Conditioner > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Regulator Pressure Sensor |
Air conditioning pressure sensor |
-32.768 to 32.767 MPaG |
Actual refrigerant pressure displayed |
|
Body Electrical > Air Conditioner > Data List
|
Tester Display |
|---|
|
Regulator Pressure Sensor |
OK:
The values displayed in the Data List and on the manifold gauge match.
| OK |
|
INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here
for HFO-1234yf(R1234yf): Click here
|
| NG |
|
|
|