RM38T0EC _58 Vehicle Interior _104612 HEATING / AIR CONDITIONING _0601796 AIR CONDITIONING SYSTEM(for HEV Model) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HEV Model)  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
·

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

1.CHECK CUSTOMIZE SETTING
a.

Using the GTS, check that the customize setting Air Inlet Mode is not set to "Automatic".

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
50006 11
OK:

Air Inlet Mode is not set to "Automatic".



Result:
Proceed to
OK
NG



OK

2.READ VALUE USING GTS

NG

CUSTOMIZE SETTING

Set Air Inlet Mode to "Manual"


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 Thermistor assembly Min.: -327.68°C (-557.82°F)
Max.: 327.67°C (621.81°F) 		Actual ambient temperature displayed Thermistor assembly circuit malfunction
Body Electrical > Air Conditioner > Data List
Tester Display
Ambient Temperature Sensor
50003 450 101
OK:

The value of the display does not change frequently.



Result:
Proceed to
OK
NG



OK

3.READ VALUE USING GTS

NG

GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HEV Model)>Ambient Temperature Display System


3.READ VALUE USING GTS
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:
·

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
50003 372 205
OK:

The value of the display does not change frequently.



Result:
Proceed to
OK
NG



OK

4.CHECK REFRIGERANT PRESSURE

NG

GO TO COOLING SYSTEM

Click hereEngine / Hybrid System>M20F-FXS, M20G-FXS (COOLING)>COOLING SYSTEM>ON-VEHICLE INSPECTION


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.: -32768 MPaG
Max.: 32767 MPaG 		Actual refrigerant pressure displayed Refrigerant line (gas leak etc.)
·

Refrigerant line (gas leak etc.)

·

Air conditioner pressure sensor circuit malfunction


Body Electrical > Air Conditioner > Data List
Tester Display
Regulator Pressure Sensor
50003 450 106

b.

Install a manifold gauge set.


c.

Read the manifold gauge pressure when the following conditions are met.

i.

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)


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.



Result:
Proceed to
OK
NG



OK

GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>REFRIGERANT>ON-VEHICLE INSPECTION


NG

REPLACE AIR CONDITIONER PRESSURE SENSOR

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING PRESSURE SENSOR>REMOVAL