Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPHV
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 02/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Recirculated/Fresh Air Modes Switch without User Input; 2019 MY RAV4 HV [11/2018 - 02/2019]

Recirculated/Fresh Air Modes Switch without User Input

DESCRIPTION

If fresh/recirculation mode changes unintentionally and without permission, the following causes are possible.

Malfunction Status

Factor
  • Fresh/recirculation mode changes without permission
  • Fresh/recirculation mode light blinks
  • Automatic function set to ON in the customize setting
  • Change in fresh air temperature
  • Refrigerant pressure drop
  • Pressure sensor circuit
  • High engine coolant temperature

PROCEDURE

1.

CHECK CUSTOMIZE SETTING

(a) Use the following customize setting methods to check if the automatically fresh/recirculation mode is "ON". If the setting is on, select the setting to "OFF".

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): CUSTOMIZE PARAMETERS

  • Check setting using Techstream
  • Check setting by multi-display

OK:

Customize setting is "OFF".

NG

CHANGE CUSTOMIZE SETTING IS ON
OK

2.

READ VALUE USING TECHSTREAM (AMBIENT TEMP SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temp Sensor

Thermistor assembly

Min.: -23.30°C (-9.94°F)

Max.: 65.95°C (150.71°F)

Actual ambient temperature displayed

Thermistor assembly system malfunction

  • When open circuit: -23.30°C (-9.94°F)
  • When short circuit: 65.95°C (150.71°F)

Body Electrical > Air Conditioner > Data List

Tester Display

Ambient Temp Sensor

OK:

The value of the display does not change frequently.

NG

GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM

OK

3.

READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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

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

OK:

The value of the display does not change frequently.

NG

GO TO COOLING SYSTEM

OK

4.

CHECK REFRIGERANT PRESSURE

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(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

Measurement Item

Range

Normal Condition

Diagnostic Note

Regulator Pressure Sensor

Air conditioner pressure sensor

Min.: -456.6 kPaG (gauge)

Max.: 3294.3 kPaG (gauge)

Actual refrigerant pressure displayed
  • Refrigerant line (gas leak etc.)
  • Air conditioner pressure sensor system malfunction

Body Electrical > Air Conditioner > Data List

Tester Display

Regulator Pressure Sensor

(f) Install a manifold gauge set.

  • for HFC-134a (R134a): 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): ON-VEHICLE INSPECTION
  • for HFO-1234yf (R1234yf): 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

(g) 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 Condition

Power switch on (READY)

Doors

Fully closed (windows also fully closed)

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)

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.

OK

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

NG

REPLACE AIR CONDITIONER PRESSURE SENSOR