Toyota Yaris: Air Conditioning System / Recirculated/Fresh Air Modes do not Switch

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / 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.

Click here

OK:

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

INSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

2.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B143A87 and B143B7F is not output	A
B143A87 is output	B
B143B7F is output	C

GO TO DTC B143A87

GO TO DTC B143B7F

3.	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

OK:

The value of the display does not change frequently.

REPAIR OR REPLACE AIR CONDITIONER UNIT ASSEMBLY

GO TO COOLING SYSTEM

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