Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000026Z8T |
Model Year Start: 2023 |
Model: GR Corolla |
Prod Date Range: [09/2022 - 11/2022] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for TMC Made, and Gasoline Model, with Automatic Air Conditioning System): Cooling is Poor; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022] |
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 mode control of air conditioning system is enabled
-
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
-
Solar sensor (automatic light control sensor) malfunction
-
High inlet air temperature
-
Harness or connector
|
WIRING DIAGRAM
PROCEDURE
1.
|
CHECK ECO MODE SETTING
|
(a) Confirm that ECO HEAT/COOL switch (air conditioning control assembly) is set to off.
(b) Confirm that ECO drive mode is set to off.
HINT:
When the ECO drive mode is set to ON, the air conditioning amplifier assembly performs minimal air conditioning control in order to promote the improvement of fuel economy. Ensure that the customer understands that the airflow volume will be decreased compared to normal operation.
Control
|
Control Summary
|
Air Volume Control
|
Sets the blower level to less.
|
NEXT
|
|
|
2.
|
CHECK REFRIGERANT SHORTAGE
|
(a) Prepare the vehicle according to the table below.
Measurement Condition:
Item
|
Condition
|
A/C Switch
|
On
|
Ambient Temperature*1
|
0 to 49°C (32 to 120°F)
|
Air Conditioning Air Inlet Temperature*2
|
25 to 35°C (77 to 95°F)
|
Set Temperature
|
MAX COLD
|
Recirculation/fresh Control Switch
|
Recirculation
|
Air Vent Damper Position
|
FACE
|
Blower Speed
|
HI
|
HINT:
*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.
*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.
(b) Using the GTS, check the amount of refrigerant.
Body Electrical > Air Conditioner > Utility
Tester Display
|
Refrigerant Gas Volume Check
|
NOTICE:
If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.
HINT:
-
If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
-
When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.
Result
|
Amount of Refrigerant
|
Refrigerant shortage
|
Insufficient or leakage
|
Refrigerant correct
|
Correct
|
Refrigerant incorrect
|
Incorrect
|
OK:
"Refrigerant correct" is displayed on the GTS.
OK
|
|
|
Result
|
Proceed to
|
for Single Type
|
A
|
for Dual Type
|
B
|
A
|
|
|
4.
|
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
|
This test activates the front air mix damper control servo motor.
(No. 1 air conditioning radiator damper servo sub-assembly (air mix))
|
128: Min
384: Max
|
Operate with the ignition switch ON.
|
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:
Damper servo motor is operated.
OK
|
|
|
5.
|
CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
|
(a) Disconnect the h1 solar sensor (automatic light control sensor) connector.
(b) Disconnect the I85 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
h1-1 (CLTB) - I85-8 (CLTB)
|
Always
|
Below 1 Ω
|
h1-2 (CLTE) - I85-21 (CLTE)
|
Always
|
Below 1 Ω
|
h1-4 (CLTS) - I85-20 (CLTS)
|
Always
|
Below 1 Ω
|
h1-1 (CLTB) or I85-8 (CLTB) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
h1-2 (CLTE) or I85-21 (CLTE) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
h1-4 (CLTS) or I85-20 (CLTS) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
6.
|
INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)
|
Click here
7.
|
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
|
This test activates the Front Left Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))
|
128: Min
384: Max
|
Operate with ignition switch ON.
|
Front Right Air Mix Damper Control Servo Motor
|
This test activates the Front Right Air Mix Damper Control Servo Motor.
(No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))
|
128: Min
384: Max
|
Operate with ignition switch ON.
|
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:
Damper servo motor is operated.
|