RM3660EC _58 Vehicle Interior _080733 HEATING / AIR CONDITIONING _0598792 AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE)) J

HEATING / AIR CONDITIONING  AIR CONDITIONING SYSTEM(for HV Model (8ZR-FXE))  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


·

Change in ambient air temperature

·

Decrease in refrigerant pressure

·

Air conditioning pressure sensor circuit malfunction

·

Engine coolant temperature (high)



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
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
50003 450 101
OK:

The value of the display does not change frequently.



Result:
Proceed to
OK
NG



OK

2.READ VALUE USING GTS (COOLANT TEMPERATURE)

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System)

Click hereVehicle Interior>HEATING / AIR CONDITIONING>AIR CONDITIONING SYSTEM (for HV Model (8ZR-FXE))>Ambient Temperature Display System


2.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:
·

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

3.CHECK REFRIGERANT PRESSURE

NG

GO TO COOLING SYSTEM

Click hereEngine / Hybrid System>8ZR-FXE (COOLING)>COOLING SYSTEM>ON-VEHICLE INSPECTION


3.CHECK REFRIGERANT PRESSURE
a.

Install a manifold gauge set.

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


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
·

Refrigerant line (gas leak etc.)

·

Air conditioning pressure sensor circuit malfunction


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

The values displayed in the Data List and on the manifold gauge match.



Result:
Proceed to
OK
NG



OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

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


NG

REPLACE AIR CONDITIONING PRESSURE SENSOR

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