Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Cooling is Poor

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Hev Model) / Cooling is Poor

DESCRIPTION

If the cooling effect of the air conditioning system is weak, the following factors may be the cause.

Symptom

Factor
  • Cooling effectiveness is poor
  • Cooling response is slow
  • ECO drive mode function (air flow volume is restricted due to ECO drive mode being selected)
  • Compressor with pulley assembly malfunction
  • Refrigerant volume (high)
  • Refrigerant volume (low)
  • Clogged cooler condenser assembly fins
  • Cooling fan system malfunction
  • Mechanical locking of damper and damper link
  • Automatic light control sensor malfunction
  • High inlet air temperature
  • Harness or connector

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

B124400 is not output

A

B124400 is output

B
B

GO TO DTC B124400

A

2.

CHECK ECO MODE SETTING

(a) Check if the ECO mode indicator is off.

OK:

The ECO mode indicator is off.

NG

GO TO STEP 4

OK

3.

CHECK ECO MODE CONTROL OPERATION

(a) Operate the ECO switch assembly (air conditioning control assembly) and check that the ECO mode indicator turns off and the blower speed reduction is canceled.

HINT:

  • When ECO mode control is operating, the air conditioning amplifier assembly controls the air conditioning system to enhance fuel efficiency. Therefore, explain to the customer that, when ECO mode control is operating, the blower speed will be reduced.

    Control

    Outline

    Blower Control

    When the air conditioning system is in AUTO mode, the blower speed will be reduced to a certain speed. Additionally, if warm-up control is operating, the blower speed will be further reduced.

    Air Inlet Control

    If the ambient temperature is a certain value or more, the air inlet mode will be changed to recirculation mode.
  • In some situations, ECO mode control may not operate even though it is enabled.

Result

Proceed to

ECO mode indicator turns off and blower speed reduction is canceled

A

ECO mode indicator turns off, but the blower speed reduction is not canceled

B

ECO mode indicator does not turn off

C
B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

C

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

A

4.

PERFORM REFRIGERANT SHORTAGE CHECK

(a) Perform the Utility according to the display on the GTS.

Body Electrical > Air Conditioner > Utility

Tester Display

Refrigerant Gas Volume Check

(b) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the GTS.

Measurement Condition:

Item

Condition

A/C switch

On

Ambient temperature*

0 to 49°C (32 to 120°F)

Blower speed

HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result

Amount of Refrigerant

Refrigerant correct

Correct

Refrigerant shortage

Insufficient

OK:

"Refrigerant correct" is displayed on the GTS.

Result

Proceed to

OK (for Dual Type)

A

OK (for Single Type)

B

NG

C
B

GO TO STEP 6

C

REPAIR REFRIGERANT LEAK

A

5.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Left Air Mix Damper Control Servo Motor

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 165 to 257 pulses

Front Right Air Mix Damper Control Servo Motor

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 255 to 347 pulses
Body Electrical > Air Conditioner > Active Test

Active Test Display

Front Left Air Mix Damper Control Servo Motor

Data List Display

Front Left Air Mix Damper Control Servo Motor Actual Pulse
Body Electrical > Air Conditioner > Active Test

Active Test Display

Front Right Air Mix Damper Control Servo Motor

Data List Display

Front Right Air Mix Damper Control Servo Motor Actual Pulse

OK:

The No. 1 air conditioning radiator damper servo motor operates.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

6.

PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Air Mix Damper Control Servo Motor

No. 1 air conditioning radiator damper servo sub-assembly pulse

Min.: 128

Max.: 384

Operates between 255 to 347 pulses
Body Electrical > Air Conditioner > Active Test

Active Test Display

Front Air Mix Damper Control Servo Motor

Data List Display

Front Air Mix Damper Control Servo Motor Actual Pulse

OK:

The No. 1 air conditioning radiator damper servo motor operates.

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR

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