Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028C4H
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Recirculated/Fresh Air Modes do not Switch; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

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*1
  • No. 5 air conditioning radiator damper servo sub-assembly malfunction*2
  • Damper link disconnection
  • Air inlet damper mechanically locked
  • Air conditioner unit assembly malfunction
  • Engine coolant temperature (high)
  • *1: for M20A-FKS
  • *2: for G16E-GTS

PROCEDURE

1.

CONFIRM MODEL

Result

Proceed to

for M20A-FKS

A

for G16E-GTS

B
B

GO TO STEP 5

A

2.

CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

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

OK:

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

NG

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

OK

3.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B143A87 and B143B7F are not output

A

B143A87 is output

B

B143B7F is output

C
B

GO TO DTC B143A87

C

GO TO DTC B143B7F

A

4.

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

OK:

The value of the display does not change frequently.

OK

REPLACE AIR CONDITIONER UNIT ASSEMBLY

NG

GO TO COOLING SYSTEM

for G16E-GTS: Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION

for M20A-FKS: Click here 2020 - 2025 MY Corolla Corolla Hatchback [09/2019 -        ]; M20A-FKS (COOLING): COOLING SYSTEM: ON-VEHICLE INSPECTION

5.

CHECK NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Check that the No. 5 air conditioning radiator damper servo sub-assembly is installed correctly.

OK:

No. 5 air conditioning radiator damper servo sub-assembly is installed correctly.

OK

GO TO STEP 3

NG

REINSTALL NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY