Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000025R3U |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 - 11/2022] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (except TMC Made, and Gasoline Model, with Manual Air Conditioning System for Electrical Control Type): Recirculated/Fresh Air Modes Switch without User Input; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022] |
Recirculated/Fresh Air Modes Switch without User Input
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DESCRIPTION
If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible.
Symptom
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Factor
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Recirculation/fresh mode changes without permission
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Recirculation/fresh mode light blinks
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Change in ambient air temperature
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Decrease in refrigerant pressure
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Air conditioner pressure sensor circuit malfunction
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Engine coolant temperature (high)
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PROCEDURE
1.
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READ VALUE USING TECHSTREAM
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(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
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Measurement Item
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Range
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Normal Condition
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Diagnostic Note
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Ambient Temp Sensor
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Thermistor assembly
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Min.: -23.30°C (-9.94°F)
Max.: 65.95°C (150.71°F)
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Actual ambient temperature displayed
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Thermistor assembly circuit malfunction
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When open circuit: -23.30°C (-9.94°F)
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When short circuit: 65.95°C (150.71°F)
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Body Electrical > Air Conditioner > Data List
Tester Display
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Ambient Temp Sensor
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OK:
The value of the display does not change frequently.
OK
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|
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2.
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READ VALUE USING TECHSTREAM
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(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
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Measurement Item
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Range
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Normal Condition
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Diagnostic Note
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Coolant Temperature
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Engine coolant temperature
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Min.: -40°C (-40°F), Max.: 140°C (284°F)
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75 to 100°C (167 to 212°F): After warming up
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This is the engine coolant temperature.
HINT:
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After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
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After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
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If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
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Check if the engine overheats if the value indicated is higher than 135°C (275°F).
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Powertrain > Engine > Data List
Tester Display
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Coolant Temperature
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OK:
The value of the display does not change frequently.
NG |
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GO TO COOLING SYSTEM
for M20A-FKS: Click here
for 2ZR-FAE: Click here
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OK
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3.
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CHECK REFRIGERANT PRESSURE
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(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
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Measurement Item
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Range
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Normal Condition
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Diagnostic Note
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Regulator Pressure Sensor
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Air conditioner pressure sensor
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Min.: -456.68 kPaG
Max.: 3294.37 kPaG
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Actual refrigerant pressure displayed
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-
Refrigerant line (gas leak etc.)
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Air conditioner pressure sensor circuit malfunction
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Body Electrical > Air Conditioner > Data List
Tester Display
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Regulator Pressure Sensor
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(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
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Condition
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Vehicle doors
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Fully open
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Temperature setting
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MAX COLD
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Blower speed
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HI
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A/C switch
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On
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Recirculation/fresh switch
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RECIRCULATION
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Interior temperature
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25 to 35°C (77 to 95°F)
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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.
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