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
(When same temperature set for both sides) |
·
Compressor with pulley assembly malfunction ·
Refrigerant volume (low) ·
Mechanical locking of damper and damper link ·
Automatic light control sensor malfunction ·
Harness or connector |
| Temperature of outlet air is warmer on left or right side
(When same temperature set for both sides) |
·
Mechanical locking of damper and damper link ·
Blockage in heater radiator unit sub-assembly ·
Harness or connector |
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.
| Result | Proceed to |
|---|---|
| When using cooling function | A |
| When using heater function | B |
A
B
Check for DTCs.
| Result | Proceed to |
|---|---|
| B124400 is not output | A |
| B124400 is output | B |
A
B
Prepare the vehicle according to the table below.
| 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 |
*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.
Using the GTS, check the amount of refrigerant.
| Tester Display |
|---|
| Refrigerant Gas Volume Check |
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.
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 |
"Refrigerant correct" is displayed on the GTS.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Perform the Active Test according to the display on the GTS.
| 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 |
| Active Test Display |
|---|
| Front Left Air Mix Damper Control Servo Motor |
| Data List Display |
|---|
| Front Left Air Mix Damper Control Servo Motor Actual Pulse |
| Active Test Display |
|---|
| Front Right Air Mix Damper Control Servo Motor |
| Data List Display |
|---|
| Front Right Air Mix Damper Control Servo Motor Actual Pulse |
Damper servo motor is operated.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Bleed air from cooling system.
| Proceed to |
|---|
| NEXT |
NEXT
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.
The air from the left and right front registers is the same temperature.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Perform the Active Test according to the display on the GTS.
| 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 |
| Active Test Display |
|---|
| Front Left Air Mix Damper Control Servo Motor |
| Data List Display |
|---|
| Front Left Air Mix Damper Control Servo Motor Actual Pulse |
| Active Test Display |
|---|
| Front Right Air Mix Damper Control Servo Motor |
| Data List Display |
|---|
| Front Right Air Mix Damper Control Servo Motor Actual Pulse |
Damper servo motor is operated.
| Proceed to |
|---|
| OK |
| NG |
OK
NG