- (When same temperature set for both sides)
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001HBYJ |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [01/2019 - 09/2022] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting); 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022] | ||
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Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting) |
DESCRIPTION
If the temperature of the air that blows from the left and right front registers differs, even though the same temperature is set for both sides, the following factors may be the cause.
|
Symptom |
Factor |
|---|---|
|
Temperature of outlet air is cooler on left or right side |
|
|
Temperature of outlet air is warmer on left or right side
|
|
CAUTION / NOTICE / HINT
NOTICE:
The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.
Click here
![2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System): HOW TO PROCEED WITH TROUBLESHOOTING](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK WHEN MALFUNCTION OCCURS |
Result |
Proceed to |
|---|---|
|
When using cooling function |
A |
|
When using heater function |
B |
| B |
|
|
|
2. |
CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Check for DTCs.
Body Electrical > Main Body > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
B1244 is not output |
A |
|
B1244 is output |
B |
| B |
|
GO TO DTC B1244 w/o AFS: Click here
w/ AFS: Click here
|
|
|
3. |
PERFORM REFRIGERANT SHORTAGE CHECK |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.
Body Electrical > Air Conditioner > Utility
|
Tester Display |
|---|
|
Refrigerant Gas Volume Check |
(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.
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 Techstream.
| NG |
|
CHARGE SYSTEM WITH REFRIGERANT
|
|
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Mix Servo Targ Pulse(D) |
No. 1 air conditioning radiator damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 165 and 257 pulses |
|
Air Mix Servo Targ Pulse(P) |
No. 1 air conditioning radiator damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 165 and 257 pulses* |
- *: for Dual Type
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(D) |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(P) |
OK:
Each damper servo motor operates.
| OK |
|
| NG |
|
GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR |
|
5. |
BLEED AIR FROM COOLING SYSTEM |
(a) Bleed air from cooling system.
for M20A-FKS: Click here
for 2ZR-FAE: Click here
|
|
6. |
CHECK OPERATION (AIR CONDITIONING SYSTEM) |
(a) Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.
OK:
The air from the left and right front registers is the same temperature.
| OK |
|
END (MALFUNCTION DUE TO AIR IN COOLING SYSTEM) |
|
|
7. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Air Mix Servo Targ Pulse(D) |
No. 1 air conditioning radiator damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 165 and 257 pulses |
|
Air Mix Servo Targ Pulse(P) |
No. 1 air conditioning radiator damper servo sub-assembly pulse |
Min.: 128 Max.: 383 |
Operates between 255 and 347 pulses* |
- *: for Dual Type
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(D) |
Body Electrical > Air Conditioner > Active Test
|
Tester Display |
|---|
|
Air Mix Servo Targ Pulse(P) |
OK:
Each damper servo motor operates.
| OK |
|
REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY
|
| NG |
|
GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR |
|
|