INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS [FULL-AUTO AIR CONDITIONER]

id0703c1701400

Troubleshooting item

Insufficient air (or no air) blown from vents
Description
•  Insufficient airflow from vent or duct
•  No airflow from vent or duct
•  Airflow mode does not change
Possible cause
•  Air filter clogging
•  Blower system malfunction
•  Air vent clogging
•  Duct malfunction
―  Deformation
―  Clogging
―  Air leakage
―  Poor installation
•  A/C unit malfunction
―  Airflow mode link error
―  Airflow mode door malfunction
•  Evaporator frozen due to evaporator temperature sensor malfunction

Diagnostic Procedure

Step

Inspection

Action
1
VERIFY DASH-ELECTRICAL SUPPLY UNIT DTCS
•  Perform the DTC inspection for the dash-electrical supply unit using the M-MDS.
•  Is a DTC displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting and perform the repair completion verification.
(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)
No
Go to the next step.
2
INSPECT AIR FILTER FOR CLOGGING
•  Is the air filter clogged?
Yes
Replace the malfunctioning location and perform the repair completion verification.
No
Go to the next step.
3
VERIFY BLOWER MOTOR OPERATION
•  Switch the ignition ON (engine off or on).
•  Set the airflow volume control switch to MAX.
•  Does the blower motor rotate?
Yes
Go to the next step.
No
Go to the following symptom troubleshooting.
(See AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER].)
4
VERIFY AIRFLOW CONDITION
•  Set the airflow mode to VENT mode.
•  Turn the A/C switch off.
•  Set the airflow volume control switch to MAX.
•  Does sufficient air flow from the vents when the airflow mode is in VENT mode?
Yes
Go to the next step.
No
Go to Step 7.
5
VERIFY AIRFLOW CONDITION
•  Set the airflow mode to HEAT mode.
•  Turn the A/C switch off.
•  Set the airflow volume control switch to MAX.
•  Does sufficient air flow from the vents when the airflow mode is in HEAT mode?
Yes
Go to the next step.
No
Go to Step 7.
6
VERIFY AIRFLOW CONDITION
•  Set the airflow mode to DEFROSTER mode.
•  Turn the A/C switch off.
•  Set the airflow volume control switch to MAX.
•  Does sufficient air flow from the vents when the airflow mode is in DEFROSTER mode?
Yes
Go to Step 9.
No
Go to the next step.
7
VERIFY DUCT INSTALLATION CONDITION
•  Is the duct under any of the following conditions? Clogging Deformation Air leakage Poor installation
Yes
Go to the next step.
No
After securely installing the duct to the correct position, perform the repair completion verification.
(See DASHBOARD DISASSEMBLY/ASSEMBLY.)
(See FRONT HEAT DUCT REMOVAL/INSTALLATION.)
(See REAR HEAT DUCT REMOVAL/INSTALLATION.)
8
VERIFY AIRFLOW MODE LINK OPERATION
•  Remove the airflow mode actuator.
•  Verify the operation by manually operating the airflow mode link.
•  Does the airflow mode link operate smoothly?
Yes
Replace the A/C unit because there is a malfunction in the airflow mode door, and go to the repair completion verification.
(See A/C UNIT REMOVAL/INSTALLATION.)
(See A/C UNIT DISASSEMBLY/ASSEMBLY.)
No
Replace the airflow mode link and perform the repair completion verification.
(See A/C UNIT REMOVAL/INSTALLATION.)
(See A/C UNIT DISASSEMBLY/ASSEMBLY.)
9
VERIFY EVAPORATOR TEMPERATURE SENSOR
•  Inspect the applicable parts.
•  Is the part normal?
Yes
Go to the next step.
No
Replace the malfunctioning location and perform the repair completion verification.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
Repair completion verification
VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
•  Does air flow from the vents while in each airflow mode?
Yes
Troubleshooting completed.
Explain repairs to customer.
No
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)
If the CAN communication is normal, perform the diagnosis from Step 1.