Toyota Corolla Cross: Weak Blower Output
DESCRIPTION
If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause.
|
Symptom | Factor |
|---|---|
|
|
PROCEDURE
| 1. |
CHECK AIR CONDITIONING SYSTEM |
(a) Operate the blower switch with the following conditions met and check that the airflow volume changes.
|
Blower Speed | Condition |
|---|---|
|
LO → HI |
|
OK:
Airflow volume increases.
| NG | .gif) | GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit) |
|
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| 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 |
|
| 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 |
|
| 4. |
CHECK CLEAN AIR FILTER |
(a) Visually check the clean air filter.
Click here .gif)
OK:
The clean air filter is not dirty or clogged.
| NG | | REPLACE CLEAN AIR FILTER |
|
| 5. |
CHECK NO. 1 COOLER THERMISTOR |
(a) Check the installation condition of the No. 1 cooler thermistor.
OK:
The No. 1 cooler thermistor is installed correctly.
| NG | | INSTALL NO. 1 COOLER THERMISTOR |
|
| 6. |
CHECK ASPIRATOR |
(a) Check the installation condition of the aspirator.
OK:
The aspirator is installed correctly.
| OK | | REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY |
| NG | | INSTALL ASPIRATOR |
READ NEXT:
Recirculated/Fresh Air Modes Switch without User Input
DESCRIPTION If recirculation/fresh mode changes unintentionally and without permission, the following causes are possible.
Symptom Factor
Recirculation/fresh mode changes without
Recirculated/Fresh Air Modes do not Switch
DESCRIPTION If the air inlet mode cannot be changed between recirculation/fresh or exhaust gas odors can be smelled even though recirculation mode is selected, the following factors may be the cause.
No Cool Air Comes Out
DESCRIPTION If warm air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.
Symptom Factor
No cool ai
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Check Mode Procedure
CHECK MODE PROCEDURE
DESCRIPTION
(a) Check mode has a higher sensitivity to malfunctions and can detect malfunctions
that cannot be detected in normal mode. Check mode can also detect all of the malfunctions
that can be detected in normal mode. In check mode, DTCs are stored with 1-trip
dete
