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 |
Check for DTCs.
| Result | Proceed to |
|---|---|
| B124400 is not output | A |
| B124400 is output | B |
A
B
Check if the ECO mode indicator is off.
The ECO mode indicator is off.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
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.
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 |
A
B
C
Perform the Utility according to the display on the GTS.
| Tester Display |
|---|
| Refrigerant Gas Volume Check |
Check that the following conditions are met and perform the refrigerant shortage check according to the display on the GTS.
| 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 |
"Refrigerant correct" is displayed on the GTS.
| Result | Proceed to |
|---|---|
| OK (for Dual Type) | A |
| OK (for Single Type) | B |
| NG | C |
A
B
C
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 |
The No. 1 air conditioning radiator damper servo motor operates.
| 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 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 |
| Active Test Display |
|---|
| Front Air Mix Damper Control Servo Motor |
| Data List Display |
|---|
| Front Air Mix Damper Control Servo Motor Actual Pulse |
The No. 1 air conditioning radiator damper servo motor operates.
| Proceed to |
|---|
| OK |
| NG |
OK
NG