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

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

SM2335673

id0703c1700300

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
• Dash-electrical supply unit detects DTC
― Detects DTC and activates fail-safe
• Blower system malfunction
• Vent is closed
• Vent is blocked
• Duct malfunction
― Deformation
― Blockage
― Air leakage
― Bad installation
• Airflow mode link malfunction
― Lack of grease
― Bad installation
• Airflow mode actuator malfunction
• Airflow mode door malfunction
― Bad installation
― Damage

Diagnostic Procedure

Step

Inspection

Action
1
PERFORM DASH-ELECTRICAL SUPPLY UNIT DTC INSPECTION
• Perform the dash-electrical supply unit DTC inspection using the M-MDS. (See DTC INSPECTION.)
• Are any DTCs displayed?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (US)].)
No
Go to the next step.
2
VERIFY BLOWER MOTOR OPERATION
• Switch the ignition ON (engine off or on).
• Turn the blower motor on.
• Does air flow from the vent after operating the blower motor?
Yes
Go to the next step.
No
Go to the following malfunction symptom item.
(See AMOUNT OF AIR BLOWN FROM VENTS DOES NOT CHANGE [FULL-AUTO AIR CONDITIONER].)
3
VERIFY AIRFLOW CONDITION
• Does air flow from the vent when the airflow mode is in the VENT mode?
Yes
Go to Step 7.
No
Go to the next step.
4
VERIFY VENT CONDITION
• Is the air vent (right and left/center) closed?
Yes
Open the air vent, then perform the repair completion verification.
No
Go to the next step.
5
INSPECT AIR VENT FOR BLOCKAGE
• Is the air vent blocked?
Yes
Remove the obstruction, then perform the repair completion verification.
No
Go to the next step.
6
VERIFY DUCT INSTALLATION CONDITION
• Is the duct (installed to dashboard) installed to the position correctly and securely? (See DASHBOARD REMOVAL [(US)].) (See DASHBOARD INSTALLATION [(US)].)
Yes
Inspect ducts for restriction, deformity, and air leakage, then perform the repair completion verification.
No
Install the incorrectly installed ducts properly, then perform the repair completion verification.
(See DASHBOARD DISASSEMBLY/ASSEMBLY [(US)].)
7
VERIFY AIRFLOW CONDITION
• Does air flow from the vent when the airflow mode is in the HEAT mode?
Yes
Go to Step 10.
No
Go to the next step.
8
INSPECT AIR VENT FOR BLOCKAGE
• Is the air vent blocked?
Yes
Remove the obstruction, then perform the repair completion verification.
No
Go to the next step.
9
VERIFY DUCT INSTALLATION CONDITION
• Is the duct installed to the position correctly and securely? (See FRONT HEAT DUCT REMOVAL/INSTALLATION [(US)].) (See REAR HEAT DUCT REMOVAL/INSTALLATION [(US)].)
Yes
Inspect ducts for restriction, deformity, and air leakage, then perform the repair completion verification.
No
Install the incorrectly installed ducts properly, then perform the repair completion verification.
(See FRONT HEAT DUCT REMOVAL/INSTALLATION [(US)].)
(See REAR HEAT DUCT REMOVAL/INSTALLATION [(US)].)
10
VERIFY AIRFLOW CONDITION
• Does air flow from the vent when the airflow mode is in the DEFROSTER mode?
Yes
Perform the repair completion verification.
No
Go to the next step.
11
INSPECT AIR VENT FOR BLOCKAGE
• Is the air vent blocked?
Yes
Remove the obstruction, then perform the repair completion verification.
No
Go to the next step.
12
INSPECT AIRFLOW MODE ACTUATOR
• Inspect the airflow mode actuator. (See AIRFLOW MODE ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
• Is it normal?
Yes
Go to the next step.
No
Replace the airflow mode actuator, then perform the repair completion verification.
(See AIRFLOW MODE ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER (US)].)
(See AIRFLOW MODE ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER (US)].)
13
INSPECT AIRFLOW MODE LINK SET OPERATION
• Operate the airflow mode link set manually.
• Does the airflow mode link set operate smoothly?
Yes
Go to the next step.
No
Replace the airflow mode link set, or airflow mode door, then perform the repair completion verification.
(See A/C UNIT REMOVAL/INSTALLATION [(US)].)
(See A/C UNIT DISASSEMBLY/ASSEMBLY [(US)].)
14
VERIFY DUCT INSTALLATION CONDITION
• Is the defroster duct installed to the position correctly and securely? (See DASHBOARD REMOVAL [(US)].) (See DASHBOARD INSTALLATION [(US)].)
• Are the defroster ducts installed properly? (See DASHBOARD REMOVAL [(US)].) (See DASHBOARD INSTALLATION [(US)].)
Yes
Inspect ducts for restriction, deformity, and air leakage, then perform the repair completion verification.
No
Install the incorrectly installed ducts properly, then perform the repair completion verification.
(See DASHBOARD DISASSEMBLY/ASSEMBLY [(US)].)
Repair completion verification
VERIFY THAT MALFUNCTION SYMPTOM DOES NOT RECUR AFTER REPAIR
• Is air discharged from vent?
• Does air flow from the vent 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 [(US)].)
If the CAN communication is normal, perform the diagnosis from Step 1.