Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM1000000019XOS
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): Recirculated/Fresh Air Modes do not Switch; 2019 - 2020 MY Avalon [04/2018 - 08/2020]

Recirculated/Fresh Air Modes do not Switch

DESCRIPTION

If the air inlet mode cannot be changed between recirculation/fresh or exhaust gas odors can be smelled even though recirculation mode is selected, the following factors may be the cause.

Symptom

Factor
  • Air inlet mode cannot be changed between recirculation/fresh
  • Exhaust gas odors can be smelled when air inlet mode set to recirculation mode
  • No. 1 blower damper servo sub-assembly malfunction
  • Damper link disconnection
  • Air inlet damper mechanically locked
  • Engine coolant temperature (high)
  • Air conditioner unit assembly malfunction

PROCEDURE

1.

CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 1 blower damper servo sub-assembly is installed correctly.

OK:

The No. 1 blower damper servo sub-assembly is installed correctly.

NG

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY CORRECTLY

OK

2.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B1442 is not output

A

B1442 is output

B
B

GO TO DTC B1442

A

3.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine 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:

After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.

OK

REPLACE AIR CONDITIONER UNIT ASSEMBLY

NG

GO TO COOLING SYSTEM